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Patterns of atmospheric moisture transport linked to Southern Ocean Sea ice coverage changes
Raquel Nieto 1 , Rosmeri da Rocha 2 , Luis Gimeno-Sotelo 1 , Marta Vázquez 1 , Lucia Losada 1 , Luis Gimeno 1
1  EPhysLab (Environmental Physics Laboratory), Facultade de Ciencias, Universidade de Vigo, Ourense, Spain
2  Dpt. of Atmospheric Sciences, IAG, University of São Paulo, Brazil

Published: 10 November 2017 by MDPI AG in First International Electronic Conference on the Hydrological Cycle in First International Electronic Conference on the Hydrological Cycle session Global Source and Sink Regions of Moisture and Processes
MDPI AG, 10.3390/CHyCle-2017-04877

Moisture sources identification and Sea Ice Concentration (SIC) were calculated for the period 1980-2016 for the Southern Ocean Sea. Five sectors of the Southern Ocean Sea (King Hakon VII, East Antarctic, Ross/Amundsen, Amundsen and Bellingshausen, Weddell) were selected to calculate their moisture sources. The results show that the most important moisture sources (calculated as positive values of Evaporation minus Precipitation, E-P>0) for these five seas come from extratropical latitudes in the storm track trajectories. The main moisture sources and affected regional seas are: Southern Australia (SAUS) moisture source which affect mainly Ross/Amundsen and Amundsen and Bellingshausen seas; the Atlantic Ocean is the main source of moisture for Weddell and King Hakon VII; and the Pacific Ocean provides moisture to Ross/Amundsen, Weddell and Amundsen and Bellingshausen seas. For most of these seas it was identified positive trends of E-P>0 anomalies, while negative trends were identified only for the SAUS moisture source to Amundsen and Bellingshausen Sea. In terms of SIC, for the whole Antarctic the total anomalies are increasing, but no breaking points in this time serie were detected. Preliminary results also indicate some areas, which do not coincide exactly with the limit of the regional seas, where the increase of Sea Ice Extension (SIE) is statistically significant.

Keywords: Australia, SiC, sea ice, Amundsen, Bellingshausen, Moisture Sources, Southern Ocean Sea
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