2012-2013 Science Planning Summaries
U.S. Antarctic Program - Science Support Section United States Antarctic Program United States Antarctic Program Logo National Science Foundation Logo
Studies of turbulence and mixing in the Antarctic Circumpolar Current, a continuation of DIMES

Program Manager:
Dr. Peter Milne


ASC POC/Implementer:
Addie Coyac

Dr. James Robert Ledwell (Principal Investigator)
http://dimes.ucsd.edu/External Non U.S. Government Site

Woods Hole Oceanographic Institution
Dpt. of Applied Ocean Physics & Engineering
Woods Hole, Massachusetts

Supporting Stations:  ARSV Laurence M. Gould
Research Locations:  

Project Description:
The objective of this project is to sample a tracer that was released in the Antarctic Circumpolar Current on a surface of constant neutral density near 58 degrees S Latitude, 106 degrees W Longitude in 2009. The tracer is making its way through the Drake Passage, into the Scotia Sea, and beyond into the Argentine Basin as it spreads horizontally and vertically. The ultimate objective of the tracer experiment is to measure this spreading. The depth of the tracer cloud varies from about 2,000 meters to the north of the Subantarctic Front to less than 300 meters along the Antarctic continental slope. The tracer is trifluoromethyl sulfur pentafluoride and is analyzed in seawater samples on board the RV/IB Nathaniel B. Palmer using a gas chromatograph with electron capture detector.

Field Season Overview:
Researchers will sail on the ARSV Laurence M. Gould on a crossing of Drake Passage. They will conduct numerous conductivity-temperature-depth (CTD) casts at various stations.

Deploying Team Members:

  • Brian Guest
  • Leah Houghton
  • James Ledwell (PI)

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Curator: Esther L. Hill PhD, Antarctic Support Contract   |   NSF Official: Alexandra Isern, Office of Polar Programs