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
 
Collaborative Research: Sampling the ocean - sea ice interaction in the Pacific center of the Antarctic Dipole
Jim Ryder ensures "hard hat" floats go overboard without tangling. Photo Credit: Chris Measures. 

Program Manager:
Dr. Peter Milne

O-261-N

ASC POC/Implementer:
Addie Coyac / Robert Kluckhohn

Dr. Xiaojun Yuan (Principal Investigator)
xyuan@ldeo.columbia.edu
http://www.ldeo.columbia.edu/~xyuan/ADPmooring/index.htmlExternal Non U.S. Government Site

Columbia University
Lamont Doherty Earth Observatory
New York, New York

Supporting Stations:  RV/IB Nathaniel B. Palmer
Research Locations:  Amundsen Sea

Project Description:
The Antarctic Dipole (ADP) presents the strongest tropical-polar teleconnection climate signal in the Southern Ocean, with poles centered within the Ross Gyre of the Pacific sector and the central Weddell Gyre of the Atlantic sector. The ADP is a standing mode pattern characterized by out-of-phase relationships in the surface air temperature, sea surface temperature, and sea ice fields. While the atmospheric and sea surface signatures of the ADP have received much recent attention, little is known about the role of the upper ocean in maintaining and reinforcing the ADP climate anomalies in the Southern Ocean. This project installed a deep sea mooring that reaches to the mixed layer in winter. The mooring directly monitors the upper ocean in the regional centers of the strongest climate signal in the Southern Ocean, providing an ability to investigate the role of the ocean in the highly coupled air-sea-ice system that maintains this signal. The high vertical resolution mooring data will provide unique measurements of the upper ocean temperature and salinity characteristics in the Pacific ADP center.

Field Season Overview:
The mooring was deployed last year from NBP12-02 (April 2011) at a depth of about 4600 meters. Full depth CTD stations were carried out at the mooring site and 0.5 degree north, south, east and west of the mooring site. Twenty-four XBTs and 12 XCTD were evenly deployed between the CTD stations from 150W to 130W and between CTD stations north and south of the mooring. Four ice-avoidance ARGO floats were deployed west of the mooring site in February 2010. This year three participants will deploy to recover the mooring during NBP 13-02.

Deploying Team Members:

  • Bruce Huber
  • Janet Sprintall (Co-PI)
  • Xiaojun Yuan (PI)

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