Wednesday, 29 August 2007 - 12:10 PM
3.A.B-7

Can tropical sea surface temperature be used as a first guess for the sea ice concentration temporal variability over the Amundsen and Bellingshausen Seas?

Sandra Barreira, Argentine Navy Meteorological Service, Comodoro Py 2055 - piso 15, Ciudad Autónoma de Buenos Aires, 1104, Argentina and Rosa Compagnucci, Departamento de Ciencias de la Atmósfera y los Océanos, Universidad de Buenos Aires - Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria - Pab II, Ciudad Autónoma de Buenos Aires, Argentina.

Principal Components Analysis in S-Mode was performed on monthly sea ice concentration anomalies (SICA) series. Four temporal patterns represent the SICA temporal variability over the Amundsen and Bellingshausen Seas between 1979 and 2000. The 1st, 2nd and 3rd temporal pattern series have their homogeneous areas located at the northern region of the Amundsen and Bellingshausen Seas. Negative correlations with the Surface Sea Temperature (SST) over the Tropical Pacific were found for the first three PCs when SST series preceded SICA PC series. This correlation sign relates the occurrence of ENSO warm (cold) event with posterior negative (positive) SICA anomalies over these areas that are covered by sea ice during winter and spring. The 4th PC series has its homogenous region at the coastal region of the Amundsen and Bellingshausen Seas (summer and autumn). Occurrence of sea ice in the coastal area is not related to the temperature at the Pacific.

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