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Ocean-atmosphere interactions and multi-scale climate variability in a changing climate
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Connection of Antarctic Sea Ice with China summer rainfall on the interannual time scale
Wednesday 9th @ 1130-1150, Concert Hall
Na LIU* , Nan-sen Zhu International Research Centre,Institute of Atmospheric Physics, Chinese Academy of Sciences
Shuanglin LI, Climate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences
Presenter Email: liuna0209@mails.ucas.edu.cn |
| Southern Hemisphere climate variability plays important roles on East Asian summer climate. Statistical analyses in the present study illustrate that Antarctic sea ice variability is significantly related to China summer (Jun-Jul-Aug, JJA) rainfall anomaly patterns on the interannual timescale. Prior to the first leading rainfall mode by one year, positive SIC anomaly emerges in East Ross Sea (ERS), along with negative anomaly in East Bellingshausen Sea and Weddell Sea (EBWS) during the preceding austral winter and spring. Then, we define a SIC_Dipole index. A high (low) index, which is characterized by an increased (reduced) sea ice in ERS and reduced (increased) sea ice in EBWS, is related to a southwest-northeast oriented rainfall anomaly pattern, more (less) rainfall in southern China and the lower streams of the Yangtze River, along with less (more) rainfall in other regions. While the sea ice in East Ross Sea increased, the Western Pacific Subtropical High (WPSH) and the East Asian summer monsoon (EASM) are weakened. Despite a high correlation of SIC_Dipole index with ENSO, the cross-seasonal SIC-rainfall relationships still exist after the ENSO-related signal removal. Our results further revealed that the cross-seasonal connections can be related to a tripole pattern of South Hemisphere Ocean SST anomalies. |
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