Association between Arctic autumn sea ice concentration and early winter precipitation in China
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摘要: 本文通过对中国地区实测降水及北极海冰卫星数据的分析,研究了北极秋季海冰密集度与中国初冬降雨的关系。合成分析的研究结果表明2000年之前中国南方和北方冬季降水偏少,中部降水偏多,这之后中国南方和北方冬季降水增加,中部降水减少。SVD研究结果显示,北极海冰减少使得近三十年来中国南方和北方冬季降雨呈现逐渐增多,中部地区(从青藏高原向东北方向至日本)降雨逐步减少的趋势。随着北极海冰的进一步减少,如遇合适的气候条件,南方冻雨出现的概率会加大。北极秋季海冰异常的回复过程加之冬季海冰异常的延续信号在中国、蒙古及日本北部激发一个阻塞高压,以巴伦支海/卡拉海为中心激发一个异常低压。这使得来自北冰洋大西洋扇区的冷空气南下至欧洲大陆和亚洲北部,在阻塞高压的影响下,冷空气进一步南下,进入东亚地区。这不仅使得亚洲冬季温度降低,也为中国北部降水增加提供条件。Abstract: Associations between autumn Arctic sea ice concentration (SIC) and early winter precipitation in China are studied using singular value decomposition analysis. The results show that a reduced SIC almost everywhere in the Arctic Ocean, except the northern Greenland Sea and Canadian Basin, are accompanied by dry conditions over central China, extending northeast from the Tibetan Plateau toward the Japan Sea, the Bohai Sea and the Yellow Sea, and wet conditions over South China and North China. Atmospheric circulation anomalies associated with SIC variability show two wave-train structures, which are persistent from autumn to winter, leading to the identified relationship between autumn Arctic SIC and early winter precipitation in China. Given that the decline in autumn SIC in the Arctic Ocean is expected to continue as the climate warms, this relationship provides a possible long-term outlook for early winter precipitation in China.
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Key words:
- Arctic autumn sea ice /
- early winter precipitation in China /
- SVD
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Alexander M A, Bhatt U S, Walsh J E, et al. 2004. The atmospheric re-sponse to realistic Arctic sea ice anomalies in an AGCM during winter. Journal of Climate, 17(5): 890-905 Arzel O, Fichefet T, Goosse H. 2006. Sea ice evolution over the 20th and 21st centuries as simulated by current AOGCMs. Ocean Modelling, 12(3-4): 401-415 Blanchard-Wrigglesworth E, Armour K C, Bitz C M, et al. 2011. Per-sistence and inherent predictability of Arctic sea ice in a GCM ensemble and observations. Journal of Climate, 24(1): 231-250 Bretherton C S, Smith C, Wallace J M. 1992. An intercomparison of methods for finding coupled patterns in climate data. Journal of Climate, 5(6): 541-560 Deser C, Magnusdottir G, Saravanan R, et al. 2004. The effects of North Atlantic SST and sea ice anomalies on the winter circula-tion in CCM3. Part II: Direct and indirect components of the re-sponse. Journal of Climate, 17(5): 877-889 Deser C, Tomas R, Alexander M, et al. 2010. The seasonal atmospher-ic response to projected Arctic sea ice loss in the late twenty-first century. Journal of Climate, 23(2): 333-351 DeWeaver E T, Bitz C M, Tremblay L B. 2013. Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications. Washington D C: American Geophysical Union Ghatak D, Frei A, Gong G, et al. 2010. On the emergence of an Arctic amplification signal in terrestrial Arctic snow extent. Journal of Geophysical Research: Atmospheres (1984-2012), 115(D24): doi: 10.1029/2010JD014007 Holland M M, Bitz C M, Tremblay B. 2006. Future abrupt reductions in the summer Arctic sea ice. Geophysical Research Letters, 33(23): 1-5 Honda M, Inoue J, Yamane S. 2009. Influence of low Arctic sea-ice minima on anomalously cold Eurasian winters. Geophysical Research Letters, 36(8): doi: 10.1029/2008GL037079 Honda M, Yamazaki K, Tachibana Y, et al. 1996. Influence of Okhotsk sea-ice extent on atmospheric circulation. Geophysical Re-search Letters, 23(24): 3595-3598 Kanamitsu M, Ebisuzaki W, Woollen J, et al. 2002. NCEP-DOE AMIP-II reanalysis (R-2). Bulletin of the American Meteorological So-ciety, 83(11): 1631-1643 Kumar A, Perlwitz J, Eischeid J, et al. 2010. Contribution of sea ice loss to Arctic amplification. Geophysical Research Letters, 37(21): doi: 10.1029/2010GL045022 Liu Na, Liu Jiping, Zhang Zhanhai, et al. 2012. Is extreme Arctic sea ice anomaly in 2007 a key contributor to severe January 2008 snowstorm in China?. International Journal of Climatology, 32(13): 2081-2087 Liu Na, Zhang Zhanhai, Chen Hongxia, et al. 2011. Western Indian Ocean SST signal and anomalous Antarctic sea-ice concentra-tion variation. Acta Oceanologica Sinica, 30(2): 9-13 Magnusdottir G, Deser C, Saravanan R. 2004. The effects of North At-lantic SST and sea ice anomalies on the winter circulation in CCM3. Part I: Main features and storm track characteristics of the response. Journal of Climate, 17(5): 857-876 Rigor I G, Wallace J M, Colony R L. 2002. Response of sea ice to the Arctic Oscillation. Journal of Climate, 15(18): 2648-2663 Serreze M C, Holland M M, Stroeve J. 2007. Perspectives on the Arc-tic's shrinking sea-ice cover. Science, 315(5818): 1533-1536 Singarayer J S, Bamber J L, Valdes P J. 2006. Twenty-first-century cli-mate impacts from a declining Arctic sea ice cover. Journal of Climate, 19(7): 1109-1125 Stroeve J, Holland M M, Meier W, et al. 2007. Arctic sea ice decline: Faster than forecast. Geophysical Research Letters, 34(9): doi: 10.1029/2007GL029703 Walsh J E. 1983. The role of sea ice in climatic variability: Theories and evidence. Atmosphere-Ocean, 21(3): 229-242 Wang Muyin, Overland J E. 2009. A sea ice free summer Arctic within 30 years?. Geophysical Research Letters, 36(7): doi: 10.1029/2009GL037820
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