Effects of autumn-winter Arctic sea ice on winter Siberian High  

作　　者：WU BingYi SU JingZhi ZHANG RenHe 

机构地区：[1]Chinese Academy of Meteorological Sciences, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2011年第30期3220-3228,共9页

基　　金：supported by the National Basic Research Program of China (2007CB411505);the Calling Project of China (GYHY200906017);the National Natural Science Foundation of China (40875052 and 40921003);the Basic Research Foundation of CAMS (2010Z003)

摘　　要：The intensity of the winter Siberian High has significantly negative correlations with Arctic sea ice concentration anomalies from the previous autumn to winter seasons in the Eastern Arctic Ocean and Siberian marginal seas. Our results indicate that autumn-winter Arctic sea ice concentration and concurrent sea surface temperature anomalies are responsible for the winter Siberian High and surface air temperature anomalies over the mid-high latitudes of Eurasia and East Asia. Numerical experiments also support this conclusion, and consistently show that the low sea ice concentration causes negative surface air temperature anomalies over the mid-high latitudes of Eurasia. A mechanism is proposed to explain the association between autumn-winter sea ice concentration and winter Siberian High. Our results also show that September sea ice concentration provides a potential precursor for winter Siberian High that cannot be predicted using only tropical sea surface temperatures. In the last two decades (1990–2009), a strengthening trend of winter Siberian High along with a decline trend in surface air temperature in the mid-high latitudes of the Asian Continent have favored the recent frequent cold winters over East Asia. The reason for these short-term trends in winter Siberian High and surface air temperature are discussed.The intensity of the winter Siberian High has significantly negative correlations with Arctic sea ice concentration anomalies from the previous autumn to winter seasons in the Eastern Arctic Ocean and Siberian marginal seas. Our results indicate that au- tumn-winter Arctic sea ice concentration and concurrent sea surface temperature anomalies are responsible for the winter Siberian High and surface air temperature anomalies over the mid-high latitudes of Eurasia and East Asia. Numerical experiments also support this conclusion, and consistently show that the low sea ice concentration causes negative surface air temperature anoma- lies over the mid-high latitudes of Eurasia. A mechanism is proposed to explain the association between autunm-winter sea ice concentration and winter Siberian High. Our results also show that September sea ice concentration provides a potential precursor for winter Siberian High that cannot be predicted using onty tropical sea surface temperatures. In the last two decades （1990-2009）, a strengthening trend of winter Siberian High along with a decline trend in surface air temperature in the mid-high latitudes of the Asian Continent have favored the recent frequent cold winters over East Asia. The reason for these short-term trends in winter Siberian High and surface air temperature are discussed.

关 键 词：西伯利亚高压 北极海冰 秋冬季 中高纬度地区 气温异常 海面温度异常 地表气温 欧亚大陆 

分 类 号：P731.15[天文地球—海洋科学]