I am beginning to learn some of the scientific names and I have gotten my fingers onto the computers that record the data regarding the organisms we classify. I’ve started having intelligent conversations with people and I am beginning to make sense of the activities aboard the ship. Each species is identified by its scientific nomenclature which means we hear a great deal of latin in the wet lab. All of the information is assembled and accompanies the samples to the lab for processing. Finally, we weighed and sorted the catch. The CTD was performed to capture water samples and hydrological data. They are then shipped out for processing. Forty-eight (48) hours later they are transferred to alcohol. In the cod ends, plankton and other sea life are collected from either the bottom or a maximum depth of 200 feet. The “catch” from both the Neustons and the Bongos are placed into jars with formaldehyde as a preservative. These are round shaped “sock” nets with cod ends. Now I know that a Neuston is a rectangular frame to which has been attached a “sock” style net with a round portion at the bottom known as the “cod end.” The Neuston drags at the surface and catches sargassum (sea weed) and also plankton. 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. We found that as we lowered the CTD further into the water (increased the depth) the sound velocity decreased.
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.Īfter 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. 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 very interesting and fun to be part of the scientific research that went on today by surveying the Gorman Strait. Megan and I bring the CTD safely back to the ship. 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. It is also operated manually therefore several people need to be on hand to assist in its deployment into the water. The CTD on the other hand cannot be trusted to give accurate data while the ship is in motion. 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.
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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. A machine called an MVP (moving vessel profiler) is used to do that. 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. I assist in sending the CTD line to the bottom of the ocean It is a complex process with many computer screens and complicated programs. 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 was a team effort to get the system up and working again, but they were eventually successful. The system that logs data as the ship moves through the water was unable to track the ships movements. The morning began with computer system problems – something that took teamwork and troubleshooting to fix. 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. Mission: Hydrographic and Fish Habitat Survey June 11 – 24, 2006 Assistant Survey Technician Stephanie Mills and Scientist Megan Palmer prepare the CTD for deployment
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