Month: May 2010

Posted on

Laura Rodriguez, May 28th, 2010

NOAA Teacher at Sea
Laura Rodriguez
Aboard NOAA Ship Oscar Dyson
May 24 – June 2, 2012

Mission: Fisheries Surveys
Geographical Area: Eastern Bering Sea
Date: May 28, 2010

Engineering

Sunset in the Shumagin Islands

Our sampling of Pollock larvae continues around the clock. It is interesting to see what stations have a lot of Pollock and which ones don’t. From my own observations of the condition of the bongo nets when they are retrieved, I have started to predict if there will be a lot of Pollock or only a little. If the nets are covered in reddish– brown algae, they usually do not have many Pollock, or anything else in them. The nets that are clearer, but still have some red from the copepods, seem to have more Pollock larvae. (I wonder why?)The scientists say that we have found more Pollock larvae than in the past couple of years. (Again, I wonder why?) That’s a good sign for the fishery, though. I told you in an earlier blog about how Kevin Bailey is using the data that we collect to create a model that will predict the future population of harvestable Pollock. The other two research projects that are going on have to do with determining how fast the Pollock are growing and how healthy the Pollock larvae are. Annette Dougherty, the chief scientist, is studying the otoliths, (small inner ear bones) in the Pollock. The ear bones add a layer of bone each year and create a pattern similar to the growth rings of a tree. The Pollock that are preserved are shipped to her lab where she will look at the otoliths and determine the age of the Pollock to the day. She can then compare that to the size of the Pollock and determine how fast they’re growing. Steve Porter, another scientist on board, is looking at the amount of DNA in the muscle tissue. If the muscle cells are growing and dividing into new cells, there will be a higher amount of DNA in the cells. This data shows how healthy the Pollock larvae are by showing how much their muscle cells are growing.

Engineering Main Control Panel
Diesel Generator
Electric Motor
Desalinization Unit
Sewage Treatment Unit
Hot Water Tanks

Today’s feature is on engineering. The engineering department on the ship is responsible not just for maintaining the engines of the ship that move us through the water, but also for all the major systems on the ship. They maintain the heating, cooling, electrical, plumbing and sewage systems. The ship is powered by 4 diesel generators that make the electricity for the ship.  The ship is then propelled by the use of electric motors. Using electric motors to turn the propellers decreases the vibrations being transmitted to the propellers and allows for the ship to run much more quietly. This is a good thing for a ship that wants to study fish, or anything else in the water that might be scared off by the noise.  The ship has 2 desalinization units that use heat from the engines to distill the water. The heat makes the water boil leaving the salt behind. It is then condensed back into fresh water. Ships that have engines that produce a lot of heat can use this method which is very energy efficient. Other ships have to use reverse osmosis (remember that word from the cell unit?)  Finally, engineering is responsible for collecting and treating sewage. Maybe in the old days ships would just dump their sewage into the ocean, but not anymore. The toilets are flushed by vacuum action rather than pushed through pipes by water. This decreases problems in the pipes that run throughout the ship. The waste water including what goes into the toilets is collected in a storage tank called an active tank. The active tank contains bacteria and yeast that break down the waste. From there, the water is filtered into a “Clean tank.” Here chlorine is added to make the water crystal clear before it is released into the ocean. The system contains one more tank for storage. It is used when the ship is within 3 miles of the shore and at dock so water is not released right by the land.
Answers to your questions

Hannah M. – The reason that the procedure was developed for how we sample is to minimize the shrinkage of the fish once they are caught. The scientists are trying to get an accurate measure of the fish so we try to collect and photograph them as quickly as possible. Keeping them cold helps to decrease the amount they shrink. They are preserved so that their DNA and otoliths can be examined back at the NOAA labs in Seattle.  The larvae that we are collecting are about 4 weeks old.

Exercise Room

Elaina – I haven’t spoken with each person about if they get bored on ship or not, but being on a ship is different from being on land. You have your work to do during your shift. Sometimes that can be very repetitive. On your off hours, there is not a lot to do. There are however, 2 exercise rooms, you can read or watch a movie or play video games. You can’t, however, just go out somewhere to do something.

Adeline and Deborah – Adeline asked me what my favorite job is and Deborah asked which crew member I would like to be. These are difficult questions to answer as I don’t see every aspect of each job. For what I’m doing, I enjoy seeing what we’ve caught in the net each time, and finding the Pollock larvae. As far as the different jobs on the ship, I think it would be very cool to be in charge of navigating the ship safely through the water. (See, I always want to be in charge)

Rick, the Chief Steward, in the Galley
Floyd, the second cook in the Galley

Lucy – The steward started collecting lunchboxes over 20 years ago. He did it for fun. Eventually he had so many he started to sell them. He sold an underdog lunchbox that he bought for 50 cents for $2500.00. He has sold the entire collection, now.   The Oscar Dyson stays close to Alaska. She and her 4 other sister ships were built to be used all over the US. Because of that, she is outfitted with air conditioning although it is seldom used. Her sister ships, that stay in warmer waters, also have de-icers on the windows that they never use.

Jasmine – In addition to studying the Pollock fisheries, the Oscar Dyson is also used for ecosystem studies, marine mammal and bird studies.

 

Your Question to answer

Find out more about one of the following jobs on board the ship: Include a description of their duties and requirements needed to get this job

 1.       Deck officers include CO – Commanding officer, XO – Executive officer, FOO – Field operations officer, Navigation officer, Safety officer, Medical officer

2.       Ship engineer

3.       Steward

4.       Survey technician

5.       Electronics technician

6.       Deck crew-  includes Boatswain, able-bodied seaman

Posted on

Laura Rodriguez, May 27th, 2010

NOAA Teacher at Sea
Laura Rodriguez
Aboard NOAA Ship Oscar Dyson
May 24 – June 2, 2012

Mission: Fisheries Surveys
Geographical Area: Eastern Bering Sea
Date: May 27, 2010

Why is Ocean Science Important?

The Bridge of the Oscar Dyson

Me on the bridge
Me on the bridge

I’m starting to get into a routine on board the ship now. I wake up in time for breakfast at 7 AM. Then I read through your blog entries and catch up on emails. I head up to the bridge before my watch to check out the weather log and talk to the officer on watch. I get to the chemistry lab at 10:00 to start my watch. Lunch is at 11:00, so I may get one station in before lunch. Then we work straight until dinner at 5:00. The bridge tries to time the stations so we have at least 30 minutes to eat. On Monday, we had to eat in shifts because we came on the station right at 5:00. After dinner, we work until 10:00, then Ihit my bunk and its lights out.

Deck officers on the bridge
Deck officers on the bridge

The bridge of the Oscar Dyson is an amazing place. The deck officers rotate watches on the bridge. They are responsible for the safe piloting of the ship. All of the ship’s sensors and instruments can be accessed from the bridge. It is called an integrated bridge system. There are actually 4 bridge stations in the one large room. There is the main bridge consol as well as two wing bridges and an aft control station so that the officer on watch can control the ship from anywhere on the bridge. There is also an autopilot, although he always looks scared to death and about to scream. (see picture)

Auto Pilot
Auto Pilot

Some of the instruments include 2 radar screens, an electronic navigational chart as well as the traditional paper charts. There is an echo sounder to determine depth. The ship also has 2 GPS receivers to determine latitude and longitude and 2 gyro compasses to determine direction.

Radar on the bridge
Radar on the bridge
Pilot's view from the bridge
Pilot’s view from the bridge

The ship is also equipped with de-icers in the windows of the bridge. These heat the glass and keep them ice free.

De-icers on the window
De-icers on the window

Answers to your questions:

Jesse – The CO and the XO inspect the ship to make sure that it is stable. The CO must fill out a stability report before we leave dock. It details where the fuel and cargo are  located on board to make sure that the ship is balanced. The XO does a visual inspection of the ship before we leave to make sure that everything is secure.

Zach – The ship does a man overboard drill quarterly, that means once every three months. The last one was in March, so the next one is due in June. To do the drill, they throw a buoy overboard and then announce that it is a man over board drill. Everyone goes to their stations and the ship comes about and tries to get close enough to send a rescue swimmer to the buoy. If the ship cannot get close enough, they send the FRB (Fast Rescue Boat)

Ashley – Icebergs are not something that this ship would typically encounter. If there were an iceberg, it would show up on radar. The ship would then keep en extra lookout for it and also would give it a wide berth. What the ship typically encounters is flat or pack ice. This also shows up on radar so the ship knows when it’s coming.

Kellie – The ship ran aground in the Inside Passage in 2007.  The Inside Passage is in southeast Alaska down by Juneau. The propeller was damaged and had to be rebuilt.

Hannah M – To find crew for the ship, they use a pool of wage mariners. This is a listing of people who are qualified for the different jobs. Each type of job has different requirements and the people who would like to do that job need to have certain endorsements or qualifications to perform it. The ship has a permanent crew, but they hire people through what’s known as an augmentation pool to fill any temporary jobs. To apply for a job with NOAA is a lengthy process. It can take up to 6 months before a person is hired. They have to fill out an application, go through the interview process, get background checks, including a dental check, before they are eligible to be hired. The officers are part of the NOAA corps which has a different selection process.  Applicants for the NOAA corps must have a bachelor’s degree in a major course of study that relates to NOAA’s scientific or technological activities. They then apply to be a candidate for the NOAA corps. The candidates are selected for an intensive 4-5 month initial training program. They then have a 12-15 month obligation to serve on a NOAA ship. To learn more about the NOAA corps visit. http://www.noaacorps.noaa.gov/index.html

Kyle – The Oscar Dyson will make 11 research cruises this year. Since it was launched in 2005, that’s somewhere around  50 cruises so far.

Your questions to answer:

One of the most important jobs on a ship is to navigate the ship safely from one point to another. We now have very sophisticated technology to help us navigate, but people have been navigating ships for thousands of years. Research the history of navigation. Choose one civilization and describe how they navigated on the ocean.

As always, answer in complete sentences  and elaborate. Make sure you include the URL of the website where you found the information. Also, if you have any other questions for me please include.

Posted on

David Altizio May 24-26 2010

NOAA Teacher at Sea
David Altizio
Onboard NOAA Ship Fairweather
May 17 – May 27, 2010

NOAA ship Fairweather
Mission: Hydrographic survey
Geographical Area of Cruise: SE Alaska,
from Petersburg, AK to Seattle, WA
Dates: Monday, May 24 and Tuesday, May 25,
Wednesday, May 26

Weather Data from the Bridge

Position: Hassler Harbor
Time: 0800 on 5/24
Latitude: 550 13.06’ N
Longitude: 1310 27.15’ W
Clouds: Light drizzle
Visibility: 8 miles
Position: Inside Passage
Winds: Light with variable directions
Time: 0800 on 5/25
Waves: Less than one foot Latitude: 52024.5’N
Dry Bulb Temperature: 11.20C
Longitude: 128030.0’W
Wet Bulb Temperature: 10.00C
Clouds: Mostly Cloudy
Barometric Pressure: 1006.4 mb
Visibility: 10 + miles
Tides (in feet):
Winds: 10 knots from the NE
Low @ 0439 of 0.1
Waves: One to three feet
High @ 1055 of 13.1
Dry Bulb Temperature: 11.00C
Low @ 1637 of 2.2
Wet Bulb Temperature: 10.10C
High @ 2254 of 16.4
Barometric Pressure: 1009.1 mb
Sunrise: 0422
Sunset: 2105

Science and Technology Log

On Monday we were testing one of the multi‐beam sonar transmitters that had not been working properly on the Fairweather, in Hassler Harbor near Ketchikan, AK. In order to verify that the device is working properly the ship went back and forth over an area that has previously been mapped from all different directions. This is called patch testing. Ideally you are looking for no difference in the data from one test to another test.

Me,at the helm,driving the Fairweather.
Me, practicing using the line throwing device.

While on board Monday, we also practiced using a line throwing device. This piece of equipment can be used for ship to ship rescue operations, or to get a line onto a pier if needed, or for other rescue operations. The device is powered by 3000 lbs. of compressed air. Today we only fired a test line, but the real one can travel almost 200 meters. Being prepared and knowing what to do in the case of an emergency is extremely important while out at sea. Not only was I allowed to use the device, but so was anyone else on board who had not learning how to use it properly.

Marine aneroid barometer measures air pressure.
Digital anemometer showing wind speed and wind direction.

I have also been collecting and recording the weather data from the bridge of the ship. These observations are made every hour. There are many different meteorological instruments on the Fairweather. The atmospheric pressure is recorded using an aneroid barometer. The dry and wet bulb temperature readings were taken off of a sling psychrometer, just outside of the bridge. The wind direction and wind speed were taken from a digital anemometer and verified using the vectors of the wind direction and the heading of the ship. The visibility, wave height and the cloud cover are estimated visually by observing them from the bridge of the ship.

One of the ship’s officers, tracking our plot by hand on the chart.
Me taking the temperatures off of a psychrometer outside of the bridge.

I was also given the opportunity to man the helm and drive the Fairweather, for about 10 minutes as we headed south towards British Columbia, Canada. The bridge of the Fairweather has a many different screens, monitors, sensors and gauges. In order to see where we are going there are digital charts, which have our path projected on them. Also, some of the ship’s officers will verify our position along our course by hand. The depth to the bottom is determined by a fathometer, which works by using SONAR, not as complex as the multi‐beam mapping but more similar to a fish finder. In many maritime activities the depth is measured in fathoms. One fathom is approximately 1.8 meters or 6 feet. Knowing where you are and where other vessels are is extremely important.

Some of the Fairweather’s navigation systems.
Digital fathometer, measuring depth to the bottom using SONAR

The Fairweather has enough beds to hold a maximum of 58 crew members. The ships personnel is divided between: NOAA Corps officers, survey, deck, engineers, stewards,  electronics technician and visitors. There are almost 15 NOAA officers on the Fairweather, including the CO (commanding officer), XO (executive officer), FOO (field operations officer), and all the way thru captain lieutenant commander, 3rd mate, lieutenant, and ensigns. The survey group has approximately 10 people including the chief survey technician, senior, regular, and assistants.

More of the Fairweather’s navigation systems.

Digital readout of ship’s GPS (global positioning system) for precise latitude & longitude, speed in knots, and heading in degrees.

The deck group has 12 people and they help to maintain the deck areas, drive the launch boats, and help out in the anchoring and docking processes. There are 10 engineers who  make sure the ship is running properly. There are three stewards (cooks) who are amazing and make sure everyone is fed very well. There are 2 electronics technicians, and anywhere from two to five visitors, such as teachers at sea, technology support, mission/NOAA related personnel.

My stateroom on the Fairweather’s.
Fairweather’s store.

The Fairweather was originally commissioned in October 1968, deactivated in 1989 but a critical backlog of surveys for nautical charts in Alaska was a motivating factor to reactivate it in August 2004. The home port for the Fairweather is Ketchikan, AK and it operates mostly in Alaskan coastal waters. It is designed and outfitted primarily for  conducting hydrographic surveys in support of nautical charting, but is capable of many other missions in support of NOAA programs. The ship is equipped with the latest in hydrographic survey technology – multi‐beam survey systems; high‐speed, high‐resolution side‐scan sonar; position and orientation systems, hydrographic survey launches,  and an on‐board data‐processing server. It is 232 feet long, with a beam of 42 feet. It weighs 1,591 tons and the hull is made of welded steel. The Fairweather has a range of 6,000 autical miles, can stay at sea for 30 days, and has an average cruising speed of 12 knots.

The galley (kitchen) on the Fairweather.
Dish washing station on the Fairweather.
Mess hall (dining area) on the Fairweather.
One of the food storage areas on the Fairweather.

The staterooms on the Fairweather are fine for two people to live in. There is a bunk bed, dresser/desk area, closets, sink, small refrigerator, and a TV. The food on the Fairweather is really good, not just for being at sea, but really good with a lot of different options. There is also a small store where you can buy candy, soda and clothing with logos and images of the ship. There is a small workout room that people do use to keep active. There are three different food storage areas, one for dry goods, a refrigerated area, and a freezer. The Fairweather also has laundry facilities and a sick bay.

Laundry room on the Fairweather.
Fairweather at Customhouse Cove.

Personal Log

It is hard to believe that we are already heading south towards Seattle, WA. I have really enjoyed my time onboard the Fairweather and will never forget these experiences. Being a Teacher at Sea is amazing and I highly recommend it. I have seen so many different and new things that I can now add to my “teacher toolbox”.

On Monday, being able to learn how to use the line throwing device was very cool, but that was not the highlight of my day. I was also given the opportunity to man the helm, and drive the Fairweather for about 10 minutes. It is amazing that a ship this big is so responsive to small changes in the angle of the rudders. It was sort of like driving a really big car, in the sense that when you turn the wheel right the ship goes right and turning left makes the ship go left. There is a lot to do when at the helm. You have to make sure that we are following the correct heading, going the proper speed, not heading towards any other vessels or obstructions such as logs or other debris, and in water that is deep enough for the ship. As much fun as it was it was a little nerve racking, my palms were definitely sweaty.

Along the Inside Passage

I did have the help of four other NOAA officers to assist me and help me know what to do. It is not only up to the person at the helm to make decisions about what to do or which course to follow. The Fairweather is definitely a place where the junior officers are being trained and learning what to do in all types of situations. This aspect of helping and learning was prevalent in many aspects of what I observed while onboard the Fairweather and was great to see.

A while after I manned the helm, the seas got a little rougher as we went through Dixon entrance which marks the boundary between SE Alaska and British Columbia Canada. Here we were exposed to ocean swell from the Pacific Ocean/Gulf of Alaska. I was very glad this did not go on for too long. I made the mistake of trying to write this log while the ship was rocking and rolling a little bit. Not such a good idea. One of the officers told me to put down the computer, go out on the stern (back) of the ship, and look at land along the horizon. Being outside in the fresh air, while looking at land made me feel much better.

The sick bay on the Fairweather.

The rest of the trip towards Seattle has been very nice. The seas have not been too rough, and I am really enjoying the scenery as we go through the inside passage of British Columbia, Canada. Coming home and going back to New Rochelle High School will definitely be a change from the last two weeks. I will never forget the places, people and the science I have been exposed to in my time on the Fairweather in SE Alaska. We are now in the Puget Sound, and Seattle is almost in sight and I am ready to be home, back in New York.
Signing out, David Altizio Teacher at Sea

Posted on

Laura Rodriguez, May 24th, 2010

NOAA Teacher at Sea
Laura Rodriguez
Aboard NOAA Ship Oscar Dyson
May 24 – June 2, 2012

Mission: Fisheries Surveys
Geographical Area: Eastern Bering Sea
Date: May 24, 2010

Pollock Survey Begins

Robert and Kerri deploy the CTD
Deploying the Bongo nets
The bongo nets are almost in
Retrieving the bongo nets, full of algae and hopefully full of Pollock Larvae

On Saturday, my watch began at 10:00 AM. Two of the scientists, Annette Dougherty and Kevin Bailey have watch from 4 AM until 4 PM. The other two scientists, Tiffany Vance and Steve Porter, have watch from 4 PM until 4 AM. I guess being the teacher they took pity on me and gave me half and half. Before getting to one of the stations, the scientists make sure that everything is ready. They lay out the bongo nets on the deck where they will be used. The bongo nets are two nets that from the top look like bongo drums. (See picture) There is an instrument attached to the bongo nets called a SEACAT that takes conductivity, temperature and salinity measurements during the tow. Inside the lab, buckets, bowls and tweezers are all laid out ready to be used.

As we approach each station, the bridge informs the scientists and survey technicians. The bongo nets have already been readied and are set to be deployed (put into the ocean) from the hero platform. When the OK is given, the nets are lifted by the hydrowinch to a point where they can be maneuvered over the rail and then they are lowered into the water. The nets are lowered until they are at 100 meters or 10 meters off the bottom. As they are lowered, the pilot of the boat keeps the wire at a 45° angle by moving the boat slowly forward. Once the nets reach their maximum depth, they are slowly brought back up again.  ( I tried to upload a video showing the deployment and retrieval of the bongo, but it won’t work so I’ll show you the video when I get back.

Pollock larvae under the microscope

When the nets clear the water, they are hosed down to get any organisms into the bottle on the end of the net (called the cod end.) The cod end is then removed and the contents of one net are poured into a bucket for sorting. The contents of the other net are preserved and sent to a lab in Poland where they use instruments to get a very accurate count of the Pollock.

Annette Dougherty and Kevin Bailey in the chem Lab

Inside the chem lab, the contents of the bucket are scooped out and poured little by little into a mixing bowl. We then perform a rough count by removing the very small Pollock larvae and any other fish larvae and put them into a petri dish with cold water (the petri dish is placed on top of ice.) They are only a few mm long (averaging between 6-10mm.) Once we have gone through the entire contents, the Pollock larvae are counted, photographed and the length measured. They are then placed into a labeled vial with 95% ethanol. The other fish larvae are placed in a separate vial in 100% ethanol. They are kept in case another scientific team needs the data. The Pollock larvae will be sent to the scientists’ lab back in Seattle where they will perform further analysis on them. I’ll tell you more about that in the next blog.

 

Answers to your questions:

Annalise – The ship travels at 12 knots when we are going between stations.

Abandon Ship drill – You need to know how to put on your survival suit

Matt T– The ship is very safe. Drills are conducted every week. My first day on the ship, we had a fire drill and abandon ship drill. (See photo of me in my survival suit.)

Dan – The Oscar Dyson observes and records a number of environmental conditions. The bridge takes weather readings every hour and keeps them in a weather log. These include wind direction, wind speed, seawater temperature, air temperature, air pressure, cloud cover, sea swell height and direction. Conditions in the water are also constantly monitored such as temperature, conductivity, salinity, and amount of oxygen.

Olivia – The bongo tow is one way to get fish eggs. The mesh used on the bongo nets is very fine). It is able to filter out these very small larval fish and fish eggs, too.

Brittany – There is no specific number of fish that need to be caught for this experiment. Part of the experiment is to see how many larval fish there are. For our rough count, the scientists measure 20 larvae to get an estimate of their size. They will then look at the otoliths (small inner ear bones) to estimate their age.

Euphausid – Krill
Copepod

Amy – Aside from the Pollock larvae in the nets, we have caught cod larvae, larval squid, fish eggs, amphipods, terapods, jellies, Euphausids or krill, copepods and the larvae of other fish. The nets are small enough that we don’t catch any large fish or other animals.

Josh W. and Jon – Joel Kellogg has the night shift, so I haven’t met him yet. Stephen Macri is not on this cruise so I can’t ask him your questions.

 

Questions for today

In your answers to the last blog, many of you researched the large animals that live here in the Gulf of Alaska. The most abundant organisms, however, are much smaller. Two organisms that are very important to the survival of the large animals here are copepods and Euphausids. The larval Pollock feed on the larval copepods that are called copepodites.

Find out what other animals feed on copepods and euphausids. Then, describe at least one food chain that includes copepods and one that includes krill. In your food chain start with a producer or autotroph Ex. Algae) and end with the highest level of consumer or predator (Ex. blue Whale)

 

Again, Please be sure to include the link to the website where you got your information.  Answer the questions in your own words writing complete sentences with as much detail as you can.

Posted on

David Altizio, May 22 – 23, 2010

NOAA Teacher at Sea
David Altizio
Onboard NOAA Ship Fairweather
May 17 – May 27, 2010

NOAA ship Fairweather
Mission: Hydrographic survey
Geographical Area of Cruise: SE Alaska,
from Petersburg, AK to Seattle, WA
Dates: Saturday, May 22 and Sunday, May 23

Me standing on the rocks, making tidal observations.

Weather Data from the Bridge

Position: Customhouse Cove                  Position: Customhouse Cove
Time: 0800 on 5/22                                   Time: 0800 on 5/23
Latitude: 550 56.01’ N                              Latitude: 55006.5’N
Longitude: 1310 13.75’ W                       Longitude: 131013.7’W
Clouds: Mostly Cloudy                               Clouds: Mostly Cloudy
Visibility: 10 miles                                      Visibility: 10 miles
Winds: 6 knots from the NW                     Winds: 6 knots from the SE
Waves: Less than one foot                         Waves: Less than one foot
Dry Bulb Temperature: 12.20C         Dry Bulb Temperature: 11.00C
Wet Bulb Temperature: 10.20C        Wet Bulb Temperature: 9.80C
Barometric Pressure: 1015.0 mb     Barometric Pressure: 1010.0 mb
Tides (in feet):                                             Tides (in feet):
Low @ 0224 of 2.8                                         Low @ 0335 of 1.5
High @ 0828 of 12.2                                      High @ 0943 of 12.4
Low @ 1436 of 1.6                                          Low @ 1537 of 2.0
High @ 2105 of 14.6                                      High @ 2159 of 15.4
Sunrise: 0424                                               Sunrise: 0423
Sunset: 2100                                                 Sunset: 2101

Science and Technology Log

On Saturday morning I went out and made observations at a tide gauge in Customhouse Cove. We took measurements over a three hour period every six minutes for a one minute interval. We used a pair of binoculars to read the tide staff, which was about 20 feet away, to the nearest millimeter. The purpose of taking this reading over a period of one minute is because the water is constantly moving both toward the shoreline and away from it. This interval ensures that you can get the most accurate reading as possible.

Tide staff, used for measuring rising and falling tides

On Sunday, I again went out on a small launch boat. This time we needed to complete a few more holidays using the multi‐beam sonar, then we went to two small islands, Smeaton and South Twin, to recover the GPS (global positioning systems) base stations.

Computer screen,showing live acquisition of multi-beam SONAR data from one of the holidays.

The GPS base station data is recorded daily, while the survey project is underway. The data is then uploaded during the processing phase and used to correct the precise position of the Fairweather and its launches to within a few centimeters of accuracy. This allows the survey technicians to know the exact horizontal position when all of the data was collected by the multi‐bean sonar. Sunday was the last day that data was collected on this project, and that is why we recovered both of the GPS bases stations.

Me,in the process of removing one of the GPS base

When the tide gauge was established for measurements, during April of 2010, a three hour period of observations was made, similar to what I did on Saturday morning. In the time since April, observations are to be made each week for at least 1‐2 hours. Due to the remote nature of some of the tide gauge locations this is not always possible. The purpose of the observations of the rising and falling tide is to establish the vertical location of the tide gauge sensor, which is submerged below the surface, in relation to the tide staff. These observations help in correlating the height observed on the tide staff, with benchmarks that were previously installed by the Fairweather crew along the beach.

Maritime activities throughout the world depend on accurate tidal and current information for safe operation. NOAA’s National Ocean Service collects studies and provides access to thousands of historical and real‐time observations as well as predictions of water levels, coastal currents and other data.
Ocean tides move in response to gravitational forces exerted by the moon and sun. Since the moon is much closer to the Earth it is the dominant force that affects Earth’s tides. Whichever side of the Earth is facing the moon experiences a greater gravitational attraction, and the oceans get pulled towards it causing a bulge.

Me, holding the rod for leveling measurements (with the Fair weather in the background).

When the highest part or crest of the wave reaches a particular location, high
tide occurs; low tide corresponds to the lowest part of the wave, or its trough. The difference in height between the high tide and the low tide is called the tidal range. Here, in SE Alaska there is almost a 15 feet difference between high and low tide.

Me,reading the level off of the leveling rod(again with the Fairweather in the background).

Most coastal areas, experience two high tides and two low tides every lunar day. Almost everyone is familiar with the concept of a 24‐hour solar day. A lunar day is the time it takes for a specific site on the Earth to rotate from an exact point under the moon to the same point under the moon the next day.

One of the benchmarks on the beach.

On Saturday afternoon, we went back to the tide gauge to take elevation levels of five benchmarks on the beach. The purpose of these measurements is to establish a vertical height of the tide gauge with five existing benchmarks. When the gauge was started in April 2010, the same measurements were made. We verified that the opening and closing measurements were within an acceptable range. After taking height measurements, I helped take out one of the prototype tide gauges since the data was not needed anymore. The regular gauge was later removed on Sunday.

Part of the tide gauge instruments, solarpanel, GPS transmitter.

I was able to help out with these height measurements by holding a rod on top of the benchmarks, while another member of the crew looked through a scope and read the levels off of the rod. We also documented the entire site by taking photographs.

A humpback whale tale.

Personal Log

The weather on Saturday was probably the best I have had in SE Alaska so far. It was sunny and in the low 60’s. I learned a few days ago, that when you are out at sea and it is sunny you need sunscreen and a baseball hat in order to not get sunburn. As I told you, on Saturday morning I was dropped off by a small boat to observe the level of the tide. Nothing too exciting, but the weather made it just fine. Since we were very close to the ship, I was able to come back on and have “hot” lunch rather than sandwiches and stuff. In the afternoon, we went back to the same tide gauge and I helped out with elevation studies is the easiest way to say it. This was better than the morning for me.

In the morning one other guy and I were literally dropped off on a barely exposed rock just offshore from the tide gauge. When we started there was water between the two of us, but we knew the tide was dropping so we were fine. However, we were sort of stranded there until the small boat picked us up for lunch. We had to take levels of the water every six minutes. Sounds boring but it went by rather quickly. As the tide dropped small tidal pools were exposed and I was able to explore. There was tons of sea life. It reminded me of Point Loma near San Diego, where I vacationed once. While we were there, of course there were bald eagles and even a few seals.

In the afternoon we actually went onto the beach and I got to explore a little. First time on land since Ketchikan; which we are still very close to. I was in my full on geologist mode, breaking and smacking rocks to see what they looked like on the inside. I saw some cool stuff, possibly some small flakes of gold, garnet crystals, and maybe some silver flakes. The captain (CO) also came along with us, which was pretty cool.

Dinner was good. Baked potato bar, some interesting tofu dish (most people ate prime rib, very rare, uncle Jerry style), salad, and coconut lemon cake for dessert. I am getting spoiled from all this good food. I watched another amazing sunset from Customhouse Cove on Saturday (that makes 3 from the same anchor spot).

Sunset on Saturday 5/22

Sunday, the weather was not as nice as Saturday; at least it did not rain. However I really did enjoy the day. The crew that I was with was great. We all got along very well. I was able to get onto land three times and explore and climb around on the rocks. Also we saw two humpback whales, a bunch of seals, more Dall’s porpoises, and yes more bald eagles.

Being able to go onshore was really special for me. I was not sure this was something I would be able to do. From here we will start making our course to Seattle. We were just told that we WILL be going through the “inside passage” which is supposed to be absolutely spectacular. I can’t wait.

For now the project is almost complete. There is only a small amount of data and bottom samples that need to be collected. I am enjoying my time onboard the Fairweather. Everyone has been very nice. I have developed a routine. I get up at 0640, breakfast begins at 0700, there is a safety meeting on the bow of the ship at 0800, then if you are on a launch you leave and come back in the late afternoon. Dinner is served at 1700, then after dinner we have a debriefing meeting to discuss the day’s work and any problems that may have been encountered.

As I said I have a little routine. Even the breakfast steward (cook) knows me by now. I come into the mess hall (dining area) and ask for my usual. Three scrambled eggs with scallions and cheese. I also have one piece of toast, three strips of bacon, some hash browns and fresh fruit, some coffee and orange juice. Not too bad. If you are doing survey work from the ship there is hot lunch at 1200, otherwise on the launches it is a bag/picnic style lunch. Yes I know I am getting spoiled with all of this good food.

Me enjoying my time on shore.
Sunset on Sunday 5/23