The Arctic Ocean Then and Now: Preliminary Hydrographic Data from the 2015 US GEOTRACES Arctic Expedition

James H Swift1, David C Kadko2, William M Smethie Jr3, Susan M Becker4, Andrew Barna4, John Cummiskey4, Joseph Gum4, Melissa T Miller4 and Courtney Schatzman4, (1)University of California San Diego, La Jolla, CA, United States, (2)Florida International University, Applied Research Center, Miami, FL, United States, (3)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (4)Scripps Institution of Oceanography, La Jolla, CA, United States
Abstract:
The US GEOTRACES Arctic Expedition on USCGC Healy, August-October 2015, offers the opportunity to compare high-quality, full water column temperature, salinity, dissolved oxygen, and nutrient data from the Canadian sector of the Arctic Ocean with data from the 1994 Makarov Basin crossing from CCGS Louis S. St-Laurent (working with USCGC Polar Sea) and the 2005 Canada Basin transect from Icebreaker Oden (working with the Healy). Supplementary 2015 cruise funding for full-depth profiles for the US Global Ocean Carbon and Repeat Hydrography program and deployment of XCTDs and XBTs are being used to improve lateral resolution along the GEOTRACES track. This will allow identification of mesoscale features (e.g. eddies), improving interpretation of hydrographic and chemical data. The GEOTRACES track overlaps with those of the two previous cruises, thus, in addition to presenting the new hydrographic data, we will show and discuss the differences over the 10- and 20-year intervals between the cruises.
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