Western Indian Ocean SST signal and anomalous Antarctic sea-ice concentration variation |
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Authors: | LIU N ZHANG Zhanhai CHEN Hongxia and LIN Lina |
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Institution: | 1.First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China2.Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China |
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Abstract: | Teleconnection between El Nino/La Nina-Southern Oscillation (ENSO) phenomenon and anoma-
lous Antarctic sea-ice variation has been studied extensively. In this study, impacts of sea surface
temperature in the Indian Ocean on Antarctic sea-ice change were investigated during Janaury
1979 and October 2009. Based on previous research results, sea areas in the western Indian Ocean
(WIO; 50°-70°E, 10°-20°S) are selected for the resreach. All variables showed 1-10 year interan-
nual timescales by Fast Founer Tranaform (FFT) transformation. Results show that i) strong WIO
signals emerged in the anomalous changes of Antarctic sea-ice concentration; ii) significant positive
correlations occurred around the Antarctic Peninsula, Ross Sea and its northwest peripheral sea
region iii) negative correlation occurred in the Indian Ocean section of the Southern Ocean, Amund-
sen Seas, and the sea area over northern Ross Sea; and iv) the atmospheric anomalies associated
with the WIO including wind, meridional heat flux, and surface air temperature over southern high
latitudes were the possible factors for the teleconnection. |
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Keywords: | Antarctic sea-ice western Indian Ocean sea surface temperature |
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