2013 – Page 8 – NOAA Teacher at Sea Blog

August 14, 2013August 20, 2021

Katie Sard: My Tidal Adventure and a Look into the Power Behind This Mighty Ship, August 13, 2013

NOAA Teacher at Sea
Katie Sard
Aboard NOAA Ship Rainier
July 29, 2013-August 15, 2013

Mission: Hydrographic Survey
Geographical Area of the Cruise: Shumagin Islands, AK
Date: August 9-13, 2013

Weather Data from the Bridge:
GPS location: 54°49.910’N, 159°46.159’W
Sky condition: OVC
Visibility: 5 nm
Wind: 10 kt, 135 true
Water temperature: 7.2°C
Air temperature: 11.0°C

Science and Technology Log

At the beginning of my time aboard the Rainier I couldn’t believe it when one of the hydrographers told me that it takes almost two years for the data that we are collecting right now to go into print. After spending time with the scientists trying to understand the process, I have a better idea of why the data can take up to 24 months to appear on a chart. There are numerous things to take into account: variables that need to be controlled for, inclement weather that may restrict completing data collection, limited personnel to process the data, reports that need to be written to accompany the data, and so on. The point being is that it is not as simple as surveying the ocean floor and making a chart.

The FOO, Meghan McGovern, leads a morning safety meeting prior to sending out the launches. — The FOO (Field Operations Officer), Meghan McGovern, leads a morning safety meeting prior to sending out the launches.

The tides are one important variable that hydrographers must control for when they are collecting data. Tides constantly cause the depths of the water to change, but it is important for the charts to show the shoalest (most shallow) depth possible for safe navigation.

Notice how one low tide is lower than the other low tide.

It’s not practical to only conduct surveys during low tides, so the data must be corrected to take water depth to a universal constant. For most of the charts, NOAA uses Mean Lower Low Water as the control. To explain Mean Lower Low Water, I have to review a bit about the tides themselves. Most places, including Alaska, experience semidiurnal tides meaning that in one day, there are two high tides and two low tides. If you look at the two low tides in one day, one of the two will be lower than the other one. An average should be taken of the “lower low” water levels for 19 years. This is how long the earth, sun, and moon to go through their various orbital eccentricities. Typically, it is not reasonable to have a gauge installed for 19 years so by acquiring one 30 day cycle of tide data we are able to get approximately 90% of the solution and the remaining 10% is solved for using “primary stations” (ones which have a 19 year record) that are nearby. This calculated average of the lower low tides is called the Mean Lower Low Water and all data is corrected to this value.

Before the water depth can be corrected to Mean Lower Low Water, the tides must first be measured. The National Water Level Observation Network has stations all over the United States which give data on how to figure out local tide conditions. The closest one to use in the Shumagins is at Sand Point on Popof Island. In order to verify that the tides are being accurately predicted, the crew on the Rainier installs their own tidal gauge to verify the tidal data.

The tide station that the Rainier crew installed on Bird Island.

A tide gauge is installed on the sea floor near the coast line by divers. It must be fairly deep so that it is always covered by water. In order to verify that the tide gauge is working, a tide staff is installed nearby for the crew to take visual water level measurements every week for 3 hours in 6 minute increments. They use this manually collected data and compare it to the tide gauge to make sure that the gauge is functioning accurately and also to ensure that the gauge has not moved relative to the land after it has been installed.

One of the five benchmarks that was cemented into the bedrock at the tide station on Bird Island.

It is a complicated process to install one of these tidal gauges, and they have to be calibrated to that Mean Lower Low Water. In order to assure that we have a reference point on land, benchmarks are put in near the tide gauge. These benchmarks should be able to be utilized for centuries by anyone who wished to come back to set-up a tide gauge.

Last Friday I was assigned to the skiff (small boat) as part of the crew of people who would go observe the tide staff and complete other necessary tasks at the tide gauge station on Bird Island. It was a 30 minute ride in the skiff from the ship, and when we got the island, the coxswain pulled the boat next to the rocks so we could quickly transfer ourselves and our gear onto the island. A total of five benchmarks had been put into the bedrock during the last visit to Bird Island, and it was our job to verify the location of each benchmark.

I had the important job of pointing at the benchmarks to note their locations for the pictures. The benchmark is embedded in the bedrock near my left hand. — I had the task of pointing at the benchmarks to note their locations for the pictures. The benchmark is embedded in the bedrock near my left hand.

We took GPS locations, measured from benchmark to benchmark, and took pictures with detailed notes telling where each of the five was located. If something happened to the primary benchmark, there would be four back-ups that could be used to reference the location of the tide gauge. It was also the responsibility of our crew to do the 3 hour tide staff observations, but bad weather only allowed us to complete one hour of data collection before we were required to return to the ship.

LT Mike Gonsalves takes a GPS location while sitting on one of the five benchmarks.

Measuring from one benchmark to the next.

LT Mike Gonsalves begins taking tide staff observations.

It constantly impresses me how many variables these scientists need to control for in order to get accurate depths to place on the charts. I have only received a snapshot of the work that goes into one of these projects during my time aboard the Rainier. I have begun to see a problem when so many people of this generation expect instant results and instant gratification. From now on it will be important for me to show my students that the scientific process is slow and arduous, but the overall results are impressive when you learn to appreciate and understand the steps that it takes to get there.

Personal Log

Earlier this week I had the opportunity to visit the engine room as the ship was getting underway. Evan McDermott , a 1^st Assistant Engineer on board, was kind enough to let me to follow him through the heart of the ship. As we walked and ducked under the various equipment, I began to realize just how naïve I am about how the ship is powered. As I began to observe and ask questions, I realized just how much time and effort it takes to get the ship in motion.

When I first went down to the engine room they had just turned the pumps on. These pumps are used to help turn the rudders. Each time the pumps are powered on, it is required that the engineers do a steering test. I went with Joshua Parker, a GVA (General Vessel Assistant) in the engineering department on board, as he showed me how to complete the steering test with the rudder.

GVA Josh Parker helps to show me around the engine room.

While we were anchored, the engines were powered down and we were running the basic functions of the ship with two generators which stay on 24 hours a day while the ship is underway. When I came back to the engine room it was time to turn the engines on, and Evan walked me through how to do this. Really all I did was push two buttons that he showed me, but it was neat to hear the engines come to life.

The two 12-cylinder engines that we have on board.

While I was in the engine room, I remembered several of the questions my students had when the CO came to speak to my class last year. I seemed to remember a lot of students asking questions about the fuel that the Rainier uses. I decided to do some investigating by asking some of my own questions. It turns out that the ship is able to carry a total of 103,000 gallons of fuel at a time. On a typical 18 day leg, the ship will burn about 30,000 gallons of fuel. Evan pulled up a detailed Microsoft Excel sheet and showed me how they keep track of the fuel being used. He showed me that while underway the ship typically burns about 2,000 gallons each day, but if the ship is anchored it is more like 600 gallons.

Something else I learned while in the engine room was how this ship uses fuel as ballast. Normally on a ship, ballast is water that is taken in to help keep the ship balanced. The Rainier has 17 fuel tanks all around the ship, and one of the reasons for this is to give the ship stability.

A diagram of the 17 fuel tanks on the Rainier. Notice how they are low as they help with the stability of the ship.

For this reason, it is important that the fuel is burned in a certain order based on which tank it is in. Once the engineers decide that they need to use fuel from a certain tank, it is transferred into two settlers. This is where the water is allowed to settle out of the fuel before it is purified and transferred to the day tanks. These two-day tanks are where the two engines suck fuel from directly.

The last thing that grabbed my attention in the engine room was the process on how the sewage is filtered. I know it sounds gross, but it is such a simple chemical reaction that I feel compelled to share it! The machine that is responsible for this treatment uses salt water and DC current. The current is run through the water and breaks the salt (NaCl) into the ions Na⁺ and Cl^–. The Cl^– ions go on to reform with the OH^– ions from the water forming sodium hypochlorite. This substance acts to kill the bacteria in the sewage. Chemistry at work!

Just another Day at the Office

Evan McDermott, 1^st Assistant Engineer

After touring the engine room, I sat down with Evan to talk about his job and how he came to work for NOAA as a 1^st Assistant Engineer. He told me that he graduated from Massachusetts Maritime Academy with a BS in Marine Engineering as well receiving his US Coast Guard license. I didn’t know what a Maritime Academy was until I came aboard the Rainier, so I asked him how he originally heard about this field. Evan told me that in high school he went through a unique program where he spent two days each week doing marine engineering outside of his school. A guidance counselor told him more about the benefits of marine engineering, and that’s when Evan decided to apply to Massachusetts Maritime Academy.

During our conversation, Evan told me that what he enjoys most about his job is the variety of hands-on work that he gets to be involved in, and he also enjoys the scenery here in Alaska. He is required to stand watches in the engine room for two 4-hour shifts while the ship is underway, and he also plays a supervisory role. The engineering department on the ship is mostly responsible for the maintenance and operations. I asked him to share the advice he would give to students hoping to get into this field of work, and he said that it is important to keep up on your math to become a marine engineer! Evan told me that the Maritime Academy was a tough four years of his life, but that his hard work has paid off as he has now secured this job with NOAA.

Evan appreciates the fishing that is available in Alaska, and when not on the ship he enjoys snowboarding.

Your Questions Answered!

A friend from my high school, Derek Cusimano, works with similar technology that is being utilized on the Rainier. I was excited to see the questions he had for me, and also to realize that I actually understood how to answer some of the more technical questions. First he asked about the program that is used to collect and process the data on board. It is my understanding that on the ship, Hypack is the navigation software that is used. The bridge sees this screen, and the hydrographers use it to draw the lines to show where the ship needs to be navigated in order to collect the data. Seafloor Information Systems (SIS) is the sonar software for the EM710. Finally, CARIS is the software that is used to process the data once it is collected.

Derek also asked me about what positioning the crews use for their surveys. The tidal gauges that I discussed in this post are used for vertical control, as the water moves up and down with the tides. The scientists also have to take into account horizontal control. They need to accurately be able to tell where their position is, because without that information the water depths that we are gathering with the sonar are useless.

ENS Bill Carrier and HST Brandy Geiger work to set-up part of the horizontal control station on Bird Island.

Differential Global Positioning System (DGPS) is used from the Coast Guard station in Kodiak Alaska to gain accurate latitude and longitude. However, the Rainier crew also installs their own GPS base stations to correct the GPS positions acquired on the ship and launches during “post processing”. For this project, a GPS base station was installed on Bird Island near the tide gauge and data is down loaded via a VHF radio. These stations listen to all GPS signals and correct the locations for each satellite down to the decimeter. This allows the Rainier to correct their GPS positions to have an accuracy of just a few centimeters.

The next question comes from my 2-year old nephew Ollie Burgeson. He wanted to know what I was eating on the ship. My answer to him is a little bit of everything! I can’t say that I’ve had the same meal twice while out at sea. Meals are at 0700, 1130, and 1700, and each day a menu is posted that tells what will be available for breakfast, lunch, and dinner. The stewards also provide a stocked ice cream freezer and other snacks 24 hours a day. Many know that I eat mostly vegetarian food, and each meal there is always a vegetarian option which several crew members and I enjoy. While out on the launches, the coolers are packed full of food for the crew of each boat. Sandwiches, fresh fruit, chips, and dessert are all included on the launches.

Did You Know…

humpbackwhale_noaa_large — Photo courtesy of NOAA.

On Sunday I saw at least a dozen whales while I was looking out over the waters of the Shumagins. The ship was anchored while the launches were out gathering data. It was such a clear day that I decided to spend time on the bridge whale watching. It didn’t take long before I saw several breach in the distance. I was told by some of the crew that I was observing humpback whales, Megaptera novaeangliae. I didn’t know much about them, so I decided to do a bit of research. Here are some of the interesting things I learned about humpback whales:

Humpback whales can be found in all major oceans from the equator to sub-polar latitudes
The humpback whale’s lifespan is about 50 years
They eat mostly krill, plankton, and small fish
Humpback whales can consume up to 3,000 pounds of food per day
Females are typically longer than males, and they can reach up to 60 feet in length
Newborns weight about 2,000 pounds and adults can grow to be between 50-80,000 pounds

August 13, 2013August 13, 2021

Avery Marvin: Brown bears, fish guts, WW2 bunkers and fossils, OH MY! Adventures in Kodiak, Alaska, August 6, 2013

NOAA Teacher at Sea
Avery Marvin
Aboard NOAA Ship Rainier
July 8 — 30, 2013

Mission: Hydrographic Survey
Geographical Area of Cruise: Shumagin Islands, Alaska
Date: August 8, 2013

Current Location: 57° 47’ 35” N, 152° 23’ 39” W

Personal Log:

My Teacher at Sea experience ended on the island of Kodiak where the Rainier docked for a few days to stock up on supplies and give the crew a much-needed rest. They departed Kodiak 3 days later to begin the next 2-3 wk leg of their survey season. I had the good fortune of staying on the island for 4 days to explore its unique natural landscape and rich cultural history.

As I walked around downtown, perused the storefronts and enjoyed a latte at Harborside Coffee and Goods, one thing was very clear to me: this town is centered around fish, not tourists. Shelikolff drive is an entire street lined with fish processing plants. Trident Seafood, housed inside an old ship sprawls out on the other side of town. The harbor itself is home to over 1000 fishing vessels, ranging from huge 125 foot crab boats to 18 foot set net skiffs. Xtra Tuff fishing boots are the preferred footwear by all the locals and smelling of fish is a natural occurrence.

Avery at the NOAA Kodiak Fisheries Research Center — Avery at the Alaska/NOAA Fisheries Research Center in Kodiak where a lot of important shellfish research is conducted.

Reindeer (Caribou) sausage sandwich–The MOST delicious sauauge I have ever tasted!

When I was in the coffee shop, I noticed a young women in her late twenties with a toddler next to her, writing a letter to her husband who presumably was out at sea fishing. The letter had pictures of her son taped onto it and lots of hearts and colorful doodles–a gentle reminder that living in Kodiak is not for the faint-hearted. The life of a fisherman is physically demanding and maintaining relationships can be trying.

Kodiak has always been an industrious port and its people have always had a strong connection to the ocean. The first people of Kodiak, the Aleut from Kamchatka, inhabited the island 10,000 years ago and lived off the nutrient-rich waters for 7,500 years. They were true “nature engineers” using resources around them for fishing, clothing, dwellings and other needs. Nothing was wasted. Fishing with nets made of nettle fiber and sinew (tendon). Catching bottom dwellers with seaweed line and bone hooks. Using whalebone for door frames and sod for walls. Lighting the way with whale and seal oil lamps. Dressing in mammal skin and intestines.

I had the chance to see many original Aleut artifacts at the Baranov Museum in Kodiak. The most interesting piece was the Kayak splashguard made of mammal skin, the predecessor of the modern nylon kayak skirt used today. The translucent thin waterproof jackets made of mammal intestines also fascinated me. They looked very delicate but were actually strong and flexible when wet. Suspended from the museum ceiling, was an actual seal skin kayak or Bairdarka used by the Aleuts. They wrapped seal skin around a wood frame, tied the seams with sinew and then added a layer of seal oil for waterproofing. Aleut craftsmanship at its finest!

Avery in front of the Baranov Museum (I am waving in the back right.)

Bairdarka splashguard — Baidarka splashguard made of mammal skin

Aleut waterproof jacket made of mammal intestine

Aleut kayak or Bairdarka — Aleut kayak or Baidarka

The Aleuts clearly adapted well to their island home, making use of all that surrounded them but never exploiting these resources. Sadly in 1784, this peaceful existence was abruptly terminated by the Russians who, armed with muskets and cannons, took the island by force. Having already decimated both the sea otter and native Aleut population around the Aleutian islands, the Russians under the command of Grigory Ivanovich Shelikhov established a permanent settlement in Three Saints Bay on Kodiak to capitalize on the remaining otter population in North Pacific waters. Following the success of the fur trade industry on Kodiak, the Russians expanded their colonization on the Alaska mainland, establishing several subsequent fur trade centers.

Russian conquest was bittersweet. They brought with them diseases and modern necessities such as flour, tea, tobacco and sugar. They built several structures for their needs including fur warehouses, a school, a hospital, a stone quay, a saw mill and an ice making plant. They forced the Aleuts to be their skilled craftsmen and otter hunters. Between old world diseases, murder and abuse, many Aleuts lost their lives and those left standing witnessed the slow demise of their ancient seafarer culture.

The 126-year Russian occupation of Alaska finally came to an end when tired and poor from the Crimean war with France and England, they sold the territory to the U.S. for 7.2 million (2 cents per acre) in 1867. With high-powered firearms, the Americans continued to slaughter the otters at an unsustainable rate. Teetering on the brink of extinction, an international treaty banning the killing of otters was signed in 1911. Post otter years, Americans tried their hand at other industries including trapping, whaling, clamming, cattle ranching, fox farming and gold mining. Salmon fishing though proved to be the most reliable and profitable natural resource so the U.S. quickly established several salmon processing plants around Kodiak. Wooden dories replaced Baidarkas and by the end of the 19^th century, Kodiak had transitioned from a fur-trading hub to a fishing mecca.

Things progressed unchanged until World War II, when Kodiak seen as a strategic waypoint between Asia and the North American west coast, was transformed into a military town. The population went from 400 to several thousand in a short time. A huge self-sufficient navel base was built along with new roads around the island. In preparation for a Japanese attack, several concrete bunkers and underground bomb shelters were constructed. With all of this new infrastructure came indoor plumbing and electricity to the island. When Pearl Harbor was bombed on December 7, 1941 followed by Dutch Harbor on June 3, a Japanese attack on Kodiak seemed imminent but surprisingly the emerald isle went untouched.

Avery in WW2 bunker — Avery in WWII bunker

Today Kodiak remains an important fishing port with a wide variety of crab and fish species (salmon, cod, halibut, Pollack) caught and processed. Modern fishing equipment and boats have replaced older, more natural gear but many of the fishing methods are still the same. Similarly, the factories along Sheikolf Drive have become more automated, with less human hands along each assembly line. Also, the fish industry as a whole on Kodiak has become much more regulated.

Kodiak is a fascinating place to explore because you can see several remnants of its past interspersed around the island: concrete WWII bunkers at Fort Abercrombie, Russian Orthodox church in downtown, old WWII ship anchors lying around, a 200 year old fur warehouse (now the Baranov Museum). Unfortunately, many historical landmarks were destroyed in the 1964 Alaska earthquake. The tsunami that followed the earthquake wreaked more havoc, killing 106 Alaskans and a family of 4 camping at Beverly Beach State Park near Newport, Oregon.

Besides a rich cultural history, Kodiak Island is full of natural beauty and an assortment of cool creatures. Rosalind and I got the chance to explore fossil beach on the south-eastern side of Kodiak where we collected many unique fossils. My top finds were a snail fossil and a shale rock with encased petrified wood.

Avery finds a cool fossil at Fossil beach

After Rosalind left, I was blessed by another Teacher at Sea, Katie Sard, who spent the day with me on a spontaneous adventure around the island. We did all sorts of fun things like tide pooling, checking out WWII bunkers at Fort Abercrombie and eating Greek food at sunset at Monashka bay.

TAS's Avery and Katie Sard :) — TAS’s Avery and Katie Sard 🙂

One of the highlights of my entire Alaska trip, was the float plane trip I took to the Kenai Peninsula on the mainland to see Brown bears. These are the 2^nd largest bears in the world (next to Polar Bears), living off a rich diet of berries and salmon. I had never been in a float plane before and was impressed by how soft the landing and take off were. The aerial views were also incredible. I spotted 2 Humpback whales on the way over to the peninsula from Kodiak and on the way back another passenger spotted a pod of about 45 Orca whales! The pilot was just as excited as we were, and circled around this giant pod for about 10 minutes giving us all good views of their movement and sheer numbers. Incredible!

We landed about a football field away from the peninsula, and waded in hip deep water to the beach. The scenery was beautiful with snow-covered mountains as a backdrop and wild flowers and meandering streams in the foreground. This was perfect bear country! Within about 3 hours we saw the Brown bear Trifecta: Brown bear trying to catch salmon, Brown bear mother with 2 cubs and to cap it all off, Brown bears mating. All of these sightings were of different bears and within a stones throw away. I was surprised at how okay the bears were with our close presence. As I learned from my guide, human safety is ensured by the ability to read nonverbal bear clues which can be very subtle. For example, if a bear turns its back to you, it is saying “Please leave me alone.” You also never make eye contact with a bear or walk directly towards it. You want the bear to feel like he/she has plenty of surrounding space and an escape route if need be. Jo, our guide said that in the 20 years of leading bear tours, she has only had to get out her bear spray 3 times. And one of these times involved a naïve group of students eating Subway sandwiches in front of the bears!

The last day of my Kodiak stay was spent touring several fish factories where I got to experience the real backbones of this city. At all 3 factories, it was Pink salmon processing time which meant the machines were in full swing, with humans at various checkpoints along each assembly line. The machines did everything from decapitating each salmon to cleaning out its guts to skinning it. Each factory processed about 200,000 pounds of Pink salmon per day. In peak season with several different fish species being processed at once, the factories can see around ¾ million pounds of fish processed per day! At one factory, I learned that the big money comes from making surimi (ground fish) which is used as imitation crab all over the world. The most common fish used in surumi is the Alaska Pollock which is very plentiful in Kodiak waters. I am glad to hear that imitation crab is actually fish and not some other protein filler.

Check out these videos to see the factory process in action. It’s fascinating!!!

As you saw from the above videos, the most hands on section of the whole process is in the production of roe (salmon eggs). This is because the roe must be gently handled and graded (1-3 scale) in preparation to be sold to Japan. At $50 per pound, roe is a delicacy in Japan and often eaten raw over rice or in sushi. Also Pink and Chum salmon produce the most desirable roe called ikura or red caviar. This roe is about the size of a pea and is sold as individual pieces. In contrast, the smaller eggs of Coho and Sockeye salmon produce sujiko, which is roe still connected in the sac. Throughout each of my fish processing plant tours, I was curious to know HOW the roe was graded. To my surprise, none of the factory managers could tell me how and I unfortunately could not communicate with the highly skilled Japanese roe technicians.

So I looked it up and it turns out roe is graded using the following criteria: size (larger is better), salt content (lower is better), drip (zero is best), firmness (firm is better but not so firm the egg breaks), color (bright, red-orange outer color with a center the color and consistency of honey), luster (eggs should be shiny and slightly transparent).

It was fitting to end my Kodiak stay with some down and dirty fish factory tours as this is the lifeblood of the city (and Alaska) and a good representation of the Kodiak spirit. These factories operate 24/7 with workers on their feet for 12 hour shifts. From the Aleuts to now, the Kodiak people have always been a hardy bunch with an incredible work ethic, and the ability to adapt to one of the most challenging environments in the world. This is the ring of fire: weather and natural disasters are unpredictable. So why do people stay? It’s the sea. Beautiful. Vast. Mysterious. Full of life. She calls them back day after day, year after year. Welcome to Kodiak life.

Fun Factoid: The infamous Kodiak brown bear, the sole species of bear on the island of Kodiak, is a sub-species of the Alaskan mainland Brown bear population. Hunters come from all around the world to hunt this sub-species, paying thousands of dollars per expedition.

August 12, 2013March 12, 2021

Julia Harvey: We Came, We Fished, Now What? August 8, 2013

NOAA Teacher at Sea
Julia Harvey
Aboard NOAA Ship Oscar Dyson (NOAA Ship Tracker)
July 22 – August 10, 2013

Mission: Walleye Pollock Survey
Geographical Area of Cruise: Gulf of Alaska
Date: 8/8/13

Weather Data from the Bridge (as of 17:00 Alaska Time):
Wind Speed: 15.72 knots
Temperature: 13.4 C
Humidity: 73%
Barometric Pressure: 1012.1 mb

I just read this heads up about the weather tonight.

Science and Technology Log:

We came. We fished. We measured, counted and weighed. Now What? We completed one last trawl on Tuesday night (August 6^th). When we finished we had caught over 65,000 walleye pollock and a whole lot of POP (Pacific ocean perch) on this leg of the survey.

The scientists now process and analyze the data.

Darin Jones and Chief Scientist Patrick Ressler going over data collected.

Darin and Patrick will present at a public meeting when we are back in Kodiak on Friday. They will discuss what was seen and preliminary findings of the walleye pollock survey. Back in Seattle the MACE team will further evaluate the data along with data from the bottom trawl survey and determine the walleye pollock biomass for the Gulf of Alaska. This will then be taken under advisement by the North Pacific Fishery Management Council.

There is also the lab to clean. Even though we cleaned the lab after each trawl, it needed a good scrub down. There were scales and slime hidden everywhere. Just when you thought you were done, more scales were discovered.

Kirsten, Abigale and Darin cleaning the fish lab.

Did You Know?

The note on the white board stated that there will be beam seas tonight. What does that really mean? It means the waves are moving in a direction roughly 90° from our heading. So the water will be hitting us at a right angle to our keel. It will be a rocking boat tonight.

Darin took a sample of the salmon shark’s fin when we caught it. It will be sent to a scientist in Juneau who works at Auke Bay Laboratories (where Jodi works). The sample will be used to examine the population genetics of the salmon shark and other species such as the Pacific sleeper shark.

Personal Log:

In my first blog, I wrote about a childhood dream of becoming an oceanographer. After my third year of teaching in the Peace Corps, I decided education was my new direction. I was excited to taste that bygone dream aboard the Oscar Dyson. How do I feel now? I jokingly sent an email to my assistant principal telling her to look for a new science teacher because I love life at sea. I love collecting data in the field. Although I was not responsible for analyzing the data and I do miss my boys, I had an awesome cruise. So where does that leave me?

Heading to Kodiak across the Gulf of Alaska

It leaves me back in the classroom with an amazing sea voyage experience to share with my students. I will always long for that oceanographic career that could have been. But perhaps after my experience, I will inspire future oceanographers and fisheries scientists. And I would do Teacher at Sea again in a heartbeat. I will follow up with the outcomes and biomass estimates from MACE (Mid-Water Assessment & Conservation Engineering) and I will most definitely follow Jodi’s research on the use of multibeam sonar for seafloor mapping.

I want to say thank you to everyone who made my experience one of the best of my life and definitely the best professional development of my career. Thank you to Jennifer Hammond, Elizabeth McMahon, Jennifer Annetta, Emily Susko and Robert Ostheimer for the opportunity to participate in the NOAA Teacher at Sea Program. Thank you to NOAA for developing a practical and realistic opportunity to connect my students to ocean science. Thank you to the science team (Chief Scientist Patrick Ressler, Darin Jones, Paul Walline, Jodi Pirtle, Kirsten Simonsen, and Abigale McCarthy) aboard the Oscar Dyson for their willingness to train me, answer all of my questions, preview my blogs, and to allow me have a glimpse of their lives as scientists. Thank you to Patrick Ressler and XO Chris Skapin for promptly providing feedback on my blogs. And a special thanks to the night shift crew (Jodi, Paul and Darin). I was very nervous about adjusting to my work hours (4 pm to 4 am) especially after falling asleep that first night, but I am very grateful for colleagues who were fascinating and night-time enjoyable. Chats with everyone aboard the Oscar Dyson from fishermen to NOAA Corps to engineers to stewards to scientists were educational and pleasant. I met lots of people from all over the U.S. and some just from Newport (2 hours from Eugene).

WOW. How fortunate was I to be chosen? I am nearly speechless about what I saw and what I did. What a mind blowing three weeks. Thank You! Thank You! Thank You!

Now I begin the transition of living during daylight hours.

I hope everyone was able to sample a little of my adventure. I appreciate everyone who followed my blog especially Camas Country Mill folks.

August 11, 2013August 20, 2021

Katie Sard: A Brief History, and the “Simple” Science of Sonar, August 9, 2013

NOAA Teacher at Sea
Katie Sard
Aboard NOAA Ship Rainier
July 29-August 15, 2013

Mission: Hydrographic Survey
Geographical Area of the Cruise: Shumagin Islands, AK
Date: August 5-8, 2013

Weather Data from the Bridge:
GPS location: 54°49.402’N, 159°33.182’W
Sky condition: Overcast (OVC)
Visibility: 5 nm
Wind: 210 true, 15 kts
Water temperature: 8.3°C
Air temperature: 11.0°C

The NOAA Ship Rainier. This has been my home for the past 12 days! — The NOAA Ship *Rainier*. This has been my home for the past 12 days!

Science and Technology Log

While I was speaking with ENS Rosemary Abbitt, a Junior Officer on board, she used an analogy to describe the amount of information that she takes in every day while on the job. She said that it is like trying to get a drink from a fire hose. I thought that this was fitting as each day as a Teacher at Sea I am constantly trying to take in and process the huge amount of new information I am learning. I have jumped in to the heart of hydrographic surveys, but in this post I would like to take a step back and look at a brief history of how the use of sonar has evolved.

Before coming on the Rainier, I knew that the use of sonar on ships had something to do with sound waves traveling in the water in order to map the ocean floor. After gathering information from the crew, and a bit of my own research, I found out that sonar actually stands for Sound Navigation and Ranging. I also found out that sound waves travel better in water as compared to radar or light waves, so that is why they are used for this type of work.

The top-side unit of the sonar system that is used on board. This machine acts as the "brain" of the sonar system. — The top-side unit of the sonar system that is used on board. This machine acts as the “brain” of the sonar system.

The NOAA Ship Rainier is equipped with a Kongsberg EM710 Multibeam Sonar System which falls in the category of active sonar. The system emits acoustic signals into the water, and when the sound bounces off of an object it returns an echo to the sonar transducer. By determining the time between emission and reception, the range and the orientation of the object can be determined. The range of an object is equal to the sound speed times the travel time divided by two.

On the left you can see the machine that is used to drag the MVP in the water behind the ship while we are surveying. On the right, the MVP is ready to go in the water.

It is extremely important that the hydrographers using this technology have accurate measurements for sound speed. The Rainier is equipped with a Moving Vessel Profiler (MVP) which generates sound speed profiles. These profiles include information such as temperature, salinity, depth, and most importantly, sound speed. These measurements are applied to real-time sonar data in order to make sure that these variables are controlled for.

Sonar was first used during World War I as a way of detecting submarines. The US Coast and Geodetic Survey were the first to use sonar to map deep water areas in the 1920s. As I discussed in a previous post, lead line surveys were the primary way to gather bathymetric data up until that point. It astounds me to see all of the technology on board, but it also leaves me wondering where we’ll be in another 10 to 20 years. I suppose only time will tell what new technologies will allow for the continued exploration of our Ocean!

Personal Log

The beauty of Alaska has truly come to life for me in the last few days. Last night, the CO was kind enough to take a group of people to a nearby beach on Chernabura Island. From time to time he will do this, and the crew calls these events “Beach Parties”. It took me several minutes to gain my land legs as my body has acclimated to life on a ship. I walked the beach, but I soon turned to hike up one of the peaks that I had been seeing from a distance for so many days.

My footsteps on the beach at Chernabura Island. It's crazy to think how few people have walked on this land. — My footsteps on the beach at Chernabura Island. It’s crazy to think how few people have walked on this land.

The hike up to the top was HARD! The ground beneath my feet was not solid earth, but rather soft, boggy terrain that required a great deal of energy to hike through.

The view from a stop along the way. Looking out over Chernabura Island.

When I made it to the top I could not believe my eyes. The beauty of this untouched land was overwhelming, and I realized how very lucky I am to be on this wonderful adventure.

A hidden lake in the background at the top of the ridge on Chernabura Island.

The ship in the distance from the top of the ridge on Chernabura Island.

Just another Day at the Office…

Christie Reiser, Hydrographic Assistant Survey Technician

I began getting to know Christie while I was out on my first launch with her last week. Before this time, I had heard her mentioning that she is currently doing an internship with NOAA. This immediately caught my attention as I am always interested in how students are able to involve themselves with real-world organizations such as NOAA. As I began interviewing her I found out that she is working on her bachelor’s degree through the University of Colorado with hopes of someday becoming a physical scientist. She began her internship with NOAA last field season, and she is now a permanent employee while also completing her internship. Before her current school work she obtained an associates degree in business marketing and worked for an oil company as an executive assistant. During that time, her boss asked if she wanted to learn Geographic Information Systems (GIS) for her work, and so she was signed up for a crash course which allowed her to begin using the software to make maps. Unfortunately, she was laid off but during this time she was able to move to Europe because she has dual nationality in Germany. While overseas, she spent a year working as an apprentice in a saddlery in Austria. When she came back to the states, she decided to go back to school at the University of Colorado. She enjoyed her previous GIS experience, so she began her work in the geography department which led her to the internship with NOAA.

Christie told me that has truly enjoyed her time in Alaska. She loves seeing the marine life and getting to know the people she works with so well. Her favorite part of the work is the night processing where she is able to work directly with the data in order to see the sea floor come to life. When asked what advice she would give a young person trying to break into this field, she said that she would recommend waiting to go to college until you are ready. Wait to find something that makes you happy and that you have a passion for.

When not on the ship, Christie enjoys leather working, saddle making, and book binding.

Your Questions Answered!

One question that I’ve had from several people has to do with the morale of the crew. These people are out to sea for 18 days at a time, and so people wanted to know if it gets depressing out here. Also, it was asked if there is good comradery and banter among the crew?

In response, I can say this; life at sea is not for the shy or the meek. While there are many amazing advantages to this type of work it definitely takes a certain type of person. As far as the morale of the crew, from my perspective it seems like field season up here means time to get business done. Everyone has important tasks to be completed, and most of the time people are busy with work. Operations run 24 hours, and the point of being here is to gather the data. However, it’s not all work and no play. Morale on the ship is important, and I’ve heard many people speak of the crew as a second or extended family. I don’t know any other job where you work, live, and share space 24 hours a day with the same people. I’ve noticed that people on the ship really look forward to meals. It is one of the small pleasures of life at sea and it is a time to gather with everyone and take a break. The universal struggle on board is the time away from home. Nobody wants to be away from their loved ones, but the crew on the Rainier work as hard as possible to make life at sea enjoyable.

My Aunt Kathy wanted to know if I have seen any whales. The ship has had to navigate around pods of whales, but it seems to be whenever I am busy with something else. Yesterday the crew called me to the bridge as they had been seeing a lot of whale activity. Of course, as soon as I got my camera out, there wasn’t a whale in sight. However, last night I was walking on Chernabura Island during the beach party, and I saw a pod of whales out in the distance. I saw four of five spouts, but they were too far to get a picture.

The first sunset I've seen since being on board. — The first sunset I’ve seen since being on board.

Did You Know…

Here are a few ship specific terms that I have learned during my time aboard the Rainier:

To come about – to turn the ship around

Aft – the back of the ship

Helm – ship’s steering equipment, found on the bridge

Pitch – the forward and backward rise and fall of the ship as it moves

Leeward – the side of an island or a ship that is sheltered from the wind

Also, when making a call to another vessel, it is important to say the call sign of the vessel you are calling for first followed by your own call sign. When I was out on RA-6 doing survey launches, I had to call the Rainier to give hourly updates. In a previous blog I told you that the call sign for the Rainier is WTEF, but they typically shorten it when out on surveys to just ET. In this case when I was calling for the ship I would say, “Echo Foxtrot this is RA-6.” The OOD would respond with, “RA-6 this is Echo Foxtrot go ahead.” This type of universal communication system is one of the ways that the team aboard the Rainier maintains safety while at sea.

August 9, 2013March 12, 2021

Julia Harvey: Calibration in Sea-Otterless Sea Otter Bay, August 7, 2013

NOAA Teacher at Sea
Julia Harvey
Aboard NOAA Ship Oscar Dyson (NOAA Ship Tracker)
July 22 – August 10, 2013

Mission: Walleye Pollock Survey
Geographical Area of Cruise: Gulf of Alaska
Date: 8/7/13

Weather Data from the Bridge (as of 21:00 Alaska Time):
Wind Speed: 10.42 knots
Temperature: 13.6 C
Humidity: 83%
Barometric Pressure: 1012.4 mb

Current Weather: A high pressure system is building in the east and the swells will increase to 8 ft tonight.

Science and Technology Log:

Before I begin, I must thank Paul for educating me on the calibration process. Because calibration occurred during the day shift, I was not awake for some of it.

The EK60 is a critical instrument for the pollock survey. The calculations from the acoustic backscatter are what determines when and where the scientists will fish. Also these measurements of backscatter are what are used, along with the estimates of size and species composition from the trawling, to estimate fish biomass in this survey. If the instruments are not calibrated then the data collected would possibly be unreliable.

Calibration of the transducers is done twice during the summer survey. It was done before leg one in June, which began out of Dutch Harbor, and again now near Yakutat as we end leg three and wrap up the 2013 survey.

As we entered Monti Bay last night, Paul observed lots of fish in the echosounder. This could pose a problem during calibrations. The backscatter from the fish would interfere with the returns from the spheres. Fortunately fish tend to migrate lower in the water column during the day when calibrations were scheduled.

This morning the Oscar Dyson moved from Monti Bay, where we stopped last night, into Sea Otter Bay and anchored up. The boat needs to be as still as possible for the calibrations to be successful.

Monti and Sea Otter Bays Map by GoogleEarth — Monti and Sea Otter Bays
Map by GoogleEarth

Calibration involves using small metal spheres made either of copper or tungsten carbide.

Chief Scientist Patrick Ressler with a tungsten carbide sphere

Copper sphere photo courtesy Richard Chewning (TAS) — Copper sphere
photo courtesy Richard Chewning (TAS)

The spheres are placed in the water under transducers. The sphere is attached to the boat in three places so that the sphere can be adjusted for depth and location. The sphere is moved throughout the beam area and pings are reflected. This backscatter (return) is recorded. The scientists know what the strength of the echo should be for this known metal. If there is a significant difference, then data will need to be processed for this difference.

The 38 khz transducer is the important one for identifying pollock. A tungsten carbide sphere was used for its calibration. Below shows the backscatter during calibration, an excellent backscatter plot.

The return for this sphere was expected to be -42.2 decibels at the temperature, salinity and depth of the calibration The actual return was -42.6 decibels. This was good news for the scientists. This difference was deemed to be insignificant.

Personal Log:

Calibration took all of the day and we finally departed at 4:30 pm. The views were breathtaking. My camera doesn’t do it justice. Paul and Darin got some truly magnificent shots.

As we left Yakutat Bay, I finally saw a handful of sea otters. They were never close enough for a good shot. They would also dive when we would get close. As we were leaving, we were able to approach Hubbard Glacier, another breathtaking sight. Despite the chill in the air, we stayed on top getting picture after picture. I think hundreds of photos were snapped this evening.

Location of Hubbard Glacier. Map from brentonwhite.com

Many came out in the cool air to check out Hubbard Glacier

Lots of ice from the glacier as we neared

Nearby Hubbard Glacier with no snow or ice — Near Hubbard Glacier

Did You Know?

According to the National Park Service, Hubbard Glacier is the largest tidewater glacier in North America. At the terminal face it is 600 feet tall. This terminal face that we saw was about 450 years old. Amazing!

NOAA Teacher at Sea Katie Sard Aboard NOAA Ship Rainier July 29, 2013-August 15, 2013

Science and Technology Log

Personal Log

Just another Day at the Office

Your Questions Answered!

Did You Know…

NOAA Teacher at Sea Katie Sard Aboard NOAA Ship Rainier July 29-August 15, 2013

Science and Technology Log

Personal Log

Just another Day at the Office…

Your Questions Answered!

Did You Know…

NOAA Teacher at Sea
Katie Sard
Aboard NOAA Ship Rainier
July 29, 2013-August 15, 2013

NOAA Teacher at Sea
Katie Sard
Aboard NOAA Ship Rainier
July 29-August 15, 2013