Precipitation and atmospheric circulation patterns at mid-latitudes of Asia
Precipitation and atmospheric circulation patterns at mid-latitudes of Asia
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DOI：
10.1002/joc.626
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发表时间：
2001-04-01
期刊：
影响因子：
--
通讯作者：
Ohta, T
中科院分区：
文献类型：
--
作者：
Aizen, EM;Aizen, VB;Ohta, T
基于57个和88个水文气候站的100年和60年记录数据，分析了亚洲中纬度地区不同地形（包括西西伯利亚、天山和帕米尔山脉、中亚平原和日本列岛）大尺度大气格局与季节和年时间尺度区域降水格局变化的耦合关系。过去100年来，西西伯利亚、天山北部地区和日本列岛的降水量呈积极趋势。北大西洋涛动（NAO）和西太平洋涛动（WPO）指数与西西伯利亚西部和中亚山区和平原的平均降水量呈负相关，与日本列岛中西部地区的平均降水量呈正相关。北美太平洋 (PNA) 指数与日本列岛大部分地区的年降水量呈正相关。北亚（NA）正异常导致日本列岛西部和东部地区冬季降水减少。我们没有发现PNA或NA对中亚降水的显着影响。我们认为，上个世纪，西急流的影响在天山和日本列岛北部地区增强，而在日本列岛东部减弱。有人认为，当西伯利亚高压位于更东边而不是更西边时，条件更有利于亚洲大陆地区的降水发展。在纬向大气格局占主导地位的发展过程中，亚洲大陆和日本中部大部分地区的年降水量和季节性降水量减少。版权所有 (C) 2001 英国皇家气象学会。
Analyses of the coupling between large-scale atmospheric patterns and modifications of regional precipitation regimes at seasonal and annual time scales in different terrain of mid-latitudes in Asia, including western Siberia, Tien Shan and Pamir mountains, and plains of middle Asia and Japanese Islands, were examined based on data from 57 and 88 hydro-climatic stations with 100 and 60 year records, respectively. For the past 100 years, a positive trend in precipitation was revealed in western Siberia, northern regions of Tien Shan and Japanese Islands. North Atlantic Oscillation (NAO) and West Pacific Oscillation (WPO) indices have inverse associations, with average amount of precipitation in western Siberia and in mountains and plains of middle Asia, and positive correlation in central and western regions of Japanese Islands. The Pacific North American (PNA) index is positively correlated with annual precipitation over most of the Japanese Islands. Northern Asian (NA) positive anomalies lead to decrease in winter precipitation in the western and eastern regions of Japanese Islands. We did not find significant impact of PNA or NA on precipitation in middle Asia. We suggest that during the last century, impacts of the western jet stream increased in the northern regions of Tien Shan and Japanese Islands, and weakened in the eastern Japanese Islands. There is a suggestion that conditions are more favourable for precipitation development over continental regions of Asia when the Siberian High is positioned further to the east than further to the west. During dominant development of a zonal atmospheric pattern, the annual and seasonal precipitation decreased over most regions in continental Asia and central Japan. Copyright (C) 2001 Royal Meteorological Society.