Water, water all around
By Jan Strugnell, British Antarctic Survey
Four different scientists with very different research interests have been collecting samples of seawater from the water column using the CTD. The CTD is an instrument used for measuring a number of parameters from the water column (including Conductivity/salinity, Temperature and Depth) and can also be used for collecting water samples from a number of depths throughout the water column. For this weeks diary entry I had a chat to each of them about their science.
National Oceanograpy Centre/University Southampton and BAS PhD student, Rachel Malinowska has been collecting water samples for her PhD using the CTD. Rachel is taking a depth transect from 10 depths (from as deep as 4500 m) from 6 sites around the Bellinghausen and Amundsen Seas and is looking at the differences in bacterial community structure from the sea surface to the sea floor. She has previously investigated bacterial community composition and abundance from sediments in the Southern Ocean and she is now interested in determining whether the breakdown of organic matter occurs during its fall through the water column or in the sediment of the deep sea. Rachel is also interested in comparing bacterial communities in surface water from different regions around Antarctica. She already has samples from the Scotia Arc and Kerguelen and is now adding samples from the Bellingshausen and Amundsen Sea for this biogeographical comparison.
Paul Carter is a PhD student from the Bristol Isotope Group (Bristol University, Earth Sciences Department) and is also collecting water using CTD