June 20, 2010
Oceanographers Call For More Antarctica Ocean-Observing
Rutgers' Oscar Schofield and five colleagues from other institutions have published in Science, calling for expanded ocean-observing in the Antarctic, particularly in the Western Antarctic Peninsula, or WAP.
This mountainous arm of the continent stretches north toward South America.
The authors' case for a greatly expanded ocean-observing capability in the peninsula is stark. They observe that 87 percent of the peninsula's glaciers are in retreat, the ice season has shortened by 90 days, and perennial sea ice is no longer a feature of this environment. They also point out that these changes are accelerating.
Until recently, most oceanographic research in the Antarctic was done from government-funded ships. Ships are expensive, limited by harsh weather, and only useful during the Antarctic summer. Scientists also have been using satellite data for the past 30 years, but since the Antarctic is often cloud-covered, such data are often incomplete.
Schofield and his colleagues suggest a "nested, multi-platform" approach to Antarctic research. This strategy would employ ships, satellites, drifting sensors, submersible robots, and sensors mounted on animals such as seals and whales. The authors write that such a strategy should quantify a heat budget (the sum of incoming and outgoing heat) for the atmosphere and ocean, help scientists understand how the deep ocean is interacting with shelf waters, how this flux changes with time, and how this affects regional marine climate, ice dynamics and ecology.
The authors write that the ocean surrounding Antarctica is warming and that this warming has driven the deglaciation of the peninsula. The interplay between ice, atmosphere and ocean in the in the peninsula produces a positive feedback "“ a situation in which a system responds to changes by amplifying subsequent changes, they say. In the case of the Western Antarctic Peninsula, this means that ice, ocean, and atmosphere work to increase each other's temperature and the rate at which their temperatures increase. However, the authors report that the mechanism of this interplay is not well understood, and expanded ocean-observing systems will help scientific understanding.
Schofield is a professor of marine science and co-director of the Coastal Ocean Observation Laboratory in the Institute of Marine and Coastal Sciences, part of the School of Environmental and Biological Sciences at Rutgers. His co-authors are Hugh Ducklow, of the Marine Biological Laboratory in Woods Hole, Mass.; Douglas G. Martinson of Columbia University's Lamont-Doherty Earth Observatory; Michael P. Meredith, of the British Antarctic Survey; Mark A. Moline, of California Polytechnic University, San Luis Obispo; and William R. Fraser of the Polar Ocean Research Group in Sheridan, Mont., who does most of his work at Palmer Station, Antarctica.
Image Caption: Scientists deployed from a research vessel get close to the ice in Antarctica. This kind of observing, Rutgers' Oscar Schofield writes, is not enough to keep up with the pace of climate change in Antarctica. Credit: Rutgers University
On the Net:
- Rutgers University
- For a description of some of the research supporting the scientists' understanding, click here and here.