Review of science issues, deployment strategy, and status for the ARM North Slope of Alaska-Adjacent Arctic Ocean climate research site

Recent climate modeling results point to the Arctic as a region that is par ticularly sensitive to global climate change. The Arctic warming predicted by the models to result from the expected doubling of atmospheric carbon di oxide is two to three times the predicted mean global warming, and consider ably greater than the warming predicted for the Antarctic. The North Slope of Alaska-Adjacent Arctic Ocean (NSA-AAO) Cloud and Radiation Testbed (CART ) site of the Atmospheric Radiation Measurement (ARM) Program is designed t o collect data on temperature-ice-albedo and water vapor-cloud-radiation fe edbacks, which are believed to be important to the predicted enhanced warmi ng in the Arctic. The most important scientific issues of Arctic, as well a s global, significance to be addressed at the NSA-AAO CART site are discuss ed, and a bl icf overview of the current approach toward, and status of, si te development is provided. ARM radiometric and remote sensing instrumentat ion is already deployed and taking data in the perennial Arctic ice pack as part of the SHEBA (Surface l-leat Budget of the Arctic Ocean) experiment. in parallel with ARM's participation in SHEBA, the NSA-AAO facility near Ba rrow was formally dedicated on 1 July 1997 and began routine data collectio n early in 1998. This schedule permits the U.S. Department of Energy's ARM Program, NASA's Arctic Cloud program, and the SHEBA program (funded primari ly by the National Science Foundation and the Office of Naval Research) to be mutually supportive. In addition, location of the NSA-AAO Barrow facilit y on National Oceanic and Atmospheric Administration land immediately adjac ent to its Climate Monitoring and Diagnostic Laboratory Barrow Observatory includes NOAA in this major interagency Arctic collaboration.