navigation – Page 10 – NOAA Teacher at Sea Blog

June 21, 2006March 18, 2021

Lisa Kercher, June 21, 2006

NOAA Teacher at Sea
Lisa Kercher
Onboard NOAA Ship Fairweather
June 11 – 24, 2006

Grant shows me the ropes of driving the boat

Mission: Hydrographic and Fish Habitat Survey
Geographic Area: Alaska
Date: June 21, 2006

Science and Technology Log

Launch 1018 set out just after 8:00 am this morning. I was teamed with FOO (Field Operations Officer) Jennifer Dowling, SST (Senior Survey Technician) Grant Froelich, and ENS Wendy Lewis. We began our day by doing something called a PATCH TEST. This test is done to determine the allowable error of the data that is collected when moving the boat back and forth over a target such a rock just below the water’s surface. The test includes a pitch test, a roll test and a heading test. Each test collects information about the boat as it makes its way through the water.

I work hard to pull in the CTD which was resting about 150 feet below on the ocean floor.

As we passed over the large rock that we were observing under the water, a clear picture of it popped up on the screen in front of us. It was neat to see an underwater picture of a feature that was collected using echo sounding. The MBES (multi beam echo sounder) transducer is able to send out hundreds of signals and receive them back to create an accurate picture of things below the water’s surface. It is quite amazing.

Midway through the day we returned to the FAIRWEATHER to a picnic lunch on the fantail. This was a fun way to send time bonding with the team I was working with that day. We then set out again for more hydrography work on the SW point of Cape Devine. I was able to do a CTD (conductivity, temperature, depth) cast all by myself. I had carefully watched others deploy the CTD throughout the week and I had assisted on several aspects of the cast, but I was excited to be able to put what I had learned into practice. The CTD has to be turned on for three minutes to warm up, and then it must sit in the water for two minutes just below the surface to properly calibrate. After that it is time to lower it to the bottom of the ocean floor to gather data, followed by quickly pulling it back to the boat. It is definitely fun, but hard work at the same time. The CTD device is by no means light! So today I drove the boat! Ok, really I just sat in the driver’s seat while SST Grant Froelich taught me how he operates the vessel. We weren’t even moving!

Personal Log

Today is World Hydrography Day and what an amazing day for it! This is by far my best day here so far! They just keep getting better and better! Absolutely beautiful weather in Alaska today! Clear skies, sun, and warm temperatures made my outlook on the day wonderful! I saw my first whale today! It was amazing. There were two off the bow of our boat during the launch. I only saw a small part of their bodies and their puffs of water from their blowholes, but it was my first sighting and what I had been waiting for! I also captured some amazingly beautiful pictures of two very large bald eagles resting on the navigation light on Andronica Island. Then to top it all off, when we returned from our launch and settled down to eat dinner, someone reported whales directly off the stern of the FAIRWEATHER playing in the Korovin Bay. I snapped some pictures as I watched them surface again and again. I am in awe of the exquisite wildlife that is all around me here in Alaska!

Two whales play in the Korovin Bay, just off the stern of the FAIRWEATHER. What a treat! — Two whales play in the Korovin Bay, just off the stern of the ship. What a treat!

Question of the Day

The bald eagles in Alaska are abundant. Unfortunately this wasn’t always the case. The population of bald eagles decreased in the past. Fortunately now the numbers of bald eagles are on the rise again. What chemical has been linked to the decrease in the bald eagle population? What was done about the use of this chemical in order to attempt to raise the numbers of bald eagles again?

Two bald eagles sit on the top of the navigational light on Andronica Island. A beautiful scene as we took a break from our work!

June 19, 2006March 18, 2021

Lisa Kercher, June 19, 2006

NOAA Teacher at Sea
Lisa Kercher
Onboard NOAA Ship Fairweather
June 11 – 24, 2006

Mission: Hydrographic and Fish Habitat Survey
Geographic Area: Alaska
Date: June 19, 2006

Science and Technology Log

The morning began at 7:00 with a delicious breakfast to fuel me up for what lie ahead. I was on the POD (plan of the day) to go out on a small launch boat. How exciting! My only hesitation was knowing that I would be out on a small boat for 8 hours and I might just have to pee! Regardless of my worriers, shortly after the 8:00 safety briefing, Launch 1010 was put in the water and myself, ENS Jonathan French, and boatmen Emily Evans and Ron Walker boarded with our gear for the day! We headed south of Andronica Island, where the FAIRWEATHER had been anchored for the night, and began our hydrography work. Each launch is equipped with the same technology that the FARIWEATHER has, making it easy to collect more data at one time. As we located the polygon where we were assigned to work, we dropped the CTD (conductivity, temperature, depth) device into the water.

Jon and Emily watch the computers to monitor our work

Jon and Emily quickly processed the data and then we began making passes through the polygon collecting data from the bottom of the ocean using the MBES (multi beam echo sounder) that is located on the underside of the boat. This equipment provides a picture of what the ocean floor looks like and locates any features such as rocks and rough terrain by bouncing beams of sound to the bottom of the ocean floor and then receiving them back. The speed at which the beams return and the length at which they travel is combined with the data that is collected from the CTD to get an accurate representation of the surface of the ocean bottom. I was able to run the equipment for a short time as Jon looked over my shoulder. It was not too difficult! I was excited to learn later that night, after our work was processed that we collected very clean data that they survey team was very happy with! Good work team!

I work the computer system, logging data as we cruise through our polygon

Personal Log

I could not believe how absolutely gorgeous it was in Alaska today! The skies were clear, the wind was calm and the temperature was warmer than it has been since arriving here! I even got to sunbathe on the launch for a short while as we cruised back to the FAIRWEATHER at the end of our workday. I got to see lots of wildlife on the launch and on Andronica Island. While surveying today and yesterday we had to travel at precise speeds to acquire the most accurate data. While on Launch 1010 today we surveyed at 8 knots, completed our roll test at 7 knots, and yesterday while surveying on the FAIRWEATHER we cruised at 10 knots. Convert each of these speeds to miles per hour to get a better idea of how fast were we moving through the water in each instance.

Stellar Sea Lions sun on a small island southwest of Andronica Island.

A black oystercatcher comes close to our campfire on Andronica Island. We were invading his habitat.

The remains of a sea urchin were washed up on the beach of Andronica Island.

Lupine, a beautiful purple flower, grew wild all over the banks of Andronica Island.

The remains of a sea urchin were washed up on the beach of Andronica Island.

Lupine, a beautiful purple flower, grew wild all over the banks of Andronica Island.

June 17, 2006March 18, 2021

Lisa Kercher, June 17, 2006

NOAA Teacher at Sea
Lisa Kercher
Onboard NOAA Ship Fairweather
June 11 – 24, 2006

Assistant Survey Technician Stephanie Mills and Physical Scientist Megan Palmer prepare the CTD for deployment — Assistant Survey Technician Stephanie Mills and Scientist Megan Palmer prepare the CTD for deployment

Mission: Hydrographic and Fish Habitat Survey
Geographic Area: Alaska
Date: June 17, 2006

Science and Technology Log

Today was an intense day of hydrography survey work! I received an introductory course to all the survey research that is done on the ship. The morning began with computer system problems – something that took teamwork and troubleshooting to fix. The system that logs data as the ship moves through the water was unable to track the ships movements. It was a team effort to get the system up and working again, but they were eventually successful. As the ship moved through the Gorman Strait collecting data using a transducer that send multiple beams to the ocean floor the technicians were able to show me how they read and interpret that data. It is a complex process with many computer screens and complicated programs.

I assist in sending the CTD line to the bottom of the ocean

I am glad I was not in charge! Every few passes through the Gorman Strait we were also required to take a sample of the conditions of the ocean floor. A machine called an MVP (moving vessel profiler) is used to do that. Unfortunately this piece of equipment would not cooperate with us either and we were forced to use the manual version of the MVP called a CTD (conductivity, temperature, depth) device. Each instrument does the same thing in sampling the conditions on the ocean floor, but the benefit of the MVP is that the ship is not required to stop to collect data when using it, hence the name moving vessel profiler. The CTD on the other hand cannot be trusted to give accurate data while the ship is in motion. It is also operated manually; therefore several people need to be on hand to assist in its deployment into the water. I was able to help in this task. By the end of the day we had nearly finished surveying the Gorman Strait and completed several CTD deployments leaving us with a lot of data that needed to be processed later that evening.

Megan and I bring the CTD safely back to the ship.

Personal Log

It was very interesting and fun to be part of the scientific research that went on today by surveying the Gorman Strait. I truly felt like I was accomplishing something of value, something that Alaskan fisherman and the cruise line industry will be able to use for years to come. It was great to be part of a team, working together to complete a task, just the way science students work in the laboratory to complete lab activities.

Question of the Day

After acquiring the data from the CTD (conductivity, temperature, depth) device, we were able to produce a graph comparing the sound velocity (the speed at which sound travels) and the depth of the water. We found that as we lowered the CTD further into the water (increased the depth) the sound velocity decreased. What type of relationship does sound velocity have to depth? What would you expect to happen to the sound velocity as you raise the CTD out of the water (decrease depth)?

In the O-Lab, Stephanie and Megan begin to process the data that we collected.

June 15, 2006March 18, 2021

Lisa Kercher, June 15, 2006

NOAA Teacher at Sea
Lisa Kercher
Onboard NOAA Ship Fairweather
June 11 – 24, 2006

Back in beautiful Homer, AK, boats are constantly coming and going

Mission: Hydrographic and Fish Habitat Survey
Geographic Area: Alaska
Date: June 15, 2006

Science and Technology Log

Last night we spent time in port back in Homer, AK. I had to opportunity to explore the small town but unfortunately did not take my camera with me. What was I thinking!?! This morning we left port and began our journey towards the Shumagin Islands where we will be conducting hydrography studies. The greatest part of today’s leg so far was the amazing volcano that I got to see. We passed by the St. Augustine volcano before noon. This area is known for its volcanoes and small earthquakes.

The Saint Augustine volcano! Notice the steam coming out of the top and the deep trenches down the side of the mountain.

Question(s) of the Day

Of the three types of geologic plate boundaries: convergent, divergent, and transform fault; deduce what type(s) of boundary must be near the St. Augustine volcano and this area of Alaska?
When was the last time that the St. Augustine volcano erupted?

June 14, 2006March 18, 2021

Lisa Kercher, June 14, 2006

NOAA Teacher at Sea
Lisa Kercher
Onboard NOAA Ship Fairweather
June 11 – 24, 2006

Mission: Hydrographic and Fish Habitat Survey
Geographic Area: Alaska
Date: June 14, 2006

Science and Technology Log

Today the crew worked on deploying several devices that work to collect information about the ocean floor. Together with the fisheries department, the FAIRWEATHER is able to gather information about the layout of the ocean floor and the substrate itself which helps them better understand what type of fish live in what area and what kind of habitat they prefer. For example, it may be known that a certain fish whose existence may be threatened and protected lives in a specific area. Therefore it is important to protect that area. With the new information that is being collected, we can tell what the bottom habitat looks like and then also work to protect not just specific locations in the water, but also specific habitats.

This large torpedo-like device is called a towfish. It is dropped into the water behind the ship to collect pictures of the ocean floor. Teacher at Sea Lisa Kercher assists in bringing it back to deck.

Personal Log

I was able to help in deploying and retrieving several of the instruments used today. While it was cold and rainy, the learning experience outweighed the negatives in the climate. It is great to be out learning what goes on in the research aspect of the science field, rather than just within the classroom!

The penetrometer has been deployed into the water to collect information about the consistency of the ocean floor.

Question of the Day

I was told that there were many sea otters surrounding the ship last night. The water was also full of kelp. Why might the two of these organisms be found in the same location of the water at the same time?