Spatial and temporal variability of Antarctic ice sheet microwave brightness temperatures

Details Spatial and temporal variability of Antarctic ice sheet microwave brightness temperatures Spatial and temporal variability of Antarctic ice sheet microwave brightness temperatures

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..25s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 20, pp. 25-1, CiteID 1964, DOI 10.1029/2002GL015490

Physics

8

Information Related To Geographic Region: Antarctica, Meteorology And Atmospheric Dynamics: Remote Sensing, Hydrology: Snow And Ice (1827), Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Polar Meteorology

Scientific paper

Annual and interannual variability of 21 years of passive microwave brightness temperatures on the Antarctic ice sheet is documented through principal component analysis. The leading modes show that brightness temperatures are dominantly forced by the annual temperature cycle, with surface melting signals explaining about 5% of the total variance of the data. Analysis of the data with the annual cycle and melting signals removed results in two significant interannual modes. The first is consistent with the Antarctic Oscillation and its influence on Antarctic surface temperatures, while the second reflects regional scale variability that appears to be linked to sea-ice anomalies and the El Niño-Southern Oscillation. The expression of these characteristic patterns of Southern Hemisphere climate variability on the Antarctic continent provides a framework for interpreting modern climate records, as well as a basis for reconstructing past climate variability with ice cores.

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