Science-of-Opportunites aboard Oden: Two NSF Supported Programs
Ocean-Atmosphere-Ice Interactions and Changes
Oden, Swedish Ice Breaker, was charted by NSF to break the shipping channel at the McMurdo Sound from 2006-2010. On her way to the Ross Island, she provided science-of-opportunities for scientists from US and Sweden conducting physical and biogeochemical sampling in the Amundsen Sea and Ross Sea.
The overarching objective of these programs was to investigate physical and biogeochemical variability in the Amundsen and Ross Seas, two regions which show contrasting responses to climate change. Specifically, we addressed the extent of CDW intrusions along the shelf, assess freshwater inputs from glacial melt and changes in sea ice production, and examined the biogeochemical fluxes in response to the different physical environments, all in the context of surface forcing associated with large-scale climate patterns.The region from the western Antarctic Peninsula to the Ross Sea is one of the least sampled in the Southern Ocean. It also is undergoing some of the most conspicuous changes that have been observed at high latitudes. These changes include the thinning and collapsing of ice shelves and contrasting regional changes in the duration of the sea ice season. The Circumpolar Deep Water (CDW), a water mass of particular significance to physical and biological dynamics, regionally floods the continental shelf, directly threatening the stability of ice shelves, and hence the ice sheet. Some of these important variables appear to be influenced by large-scale climate forcing associated with El Nino/Southern Oscillation (ENSO) and the Antarctic Dipole (ADP). Linking the climate sensitive aspects of this region to the changes in local ocean physics and biogeochemical fluxes was a key focus of these studies. Access to this region was made possible by a five year, US-Swedish cooperative agreement (starting 2007-08) using the Class 1A Swedish icebreaker, Oden that will pass through the southeast Pacific region on her way to the annual break-in of the McMurdo Ship Channel in the Ross Sea.
Our programs were a part of US/Swedish interdisciplinary collaboration during IPY. In austral summers of 2007-08 and 2008-09, we conducted physical and biogeochemical sampling on board of Oden.
National Science Foundation United States of America Swedish Polar Research Secretariat Ministry of Education and Research Sweden
Xiaojun Yuan Lamont Associate Research Professor Lamont-Doherty Earth Observatory of Columbia University The United States Raymond N. Sambrotto Lamont Associate Research Professor Lamont-Doherty Earth Observatory of Columbia University The Unites States Sharon E. Stammerjohn Senior Research Associate Institute of Arctic and Alpine Research University of Colorado, Boulder, Colorado The United States
Swedish physicists Drs. Bjork and Wahlin.
Swedish biogeochemists Drs. Chierici and Fransson