大气科学2012，Vol.36Issue(2)：297-315,19.DOI:10.3878/j.issn.1006-9895.2011.11015
欧亚北部冬季增雪“影响”我国夏季气候异常的机理研究——陆面季节演变异常的“纽带”作用
Mechanism for the Correlation of Winter Fresh Snow Extent over Northern Eurasia and Summer Climate Anomalies in China:Anomalous Seasonal Transition of Land as a Bond
摘要
Abstract
Using the National Snow and Ice Data Center (NSIDC) snow cover and snow water equivalent data, monthly four-layer soil temperature from ERA40 reanalysis dataset, the mechanisms of the linkage between the Winter Northern Eurasian Fresh Snow Extent (winter Tfse) and subsequent summer climate anomalies in China are investigated Correlation analysis shows that, the consistent seasonal evolvements of land anomalies act as a bridge for the lag correlation. A large winter Tfse is followed by a slower northeastward retreating progress of snow and frozen soil over northern Eurasia Consequently, in summer, snow and frozen soil over East Asian middle and high latitudes melt more intensively, the soil temperature correspondingly gets lower than normal, which influences local temperature by cooling and by influencing local meridional wind, and through enhancing East Asian jet, is related to the subtropical high in the western Pacific, even climate anomalies in China, and vice versa. As well as local variations of land factors over East Asian middle and high latitudes are concerned, the signal of winter Tfse is significantly strengthened during snow-and-frozen-soil melting process.关键词
冬季增雪/欧亚北部/季节演变/陆气相互作用/东亚中高纬Key words
fresh snow extent in winter/ northern Eurasia/ seasonal evolvements/ land-air interaction/ East Asian middle and high latitudes分类
天文与地球科学引用本文复制引用
穆松宁,周广庆..欧亚北部冬季增雪“影响”我国夏季气候异常的机理研究——陆面季节演变异常的“纽带”作用[J].大气科学,2012,36(2):297-315,19.基金项目
国家重点基础研究发展计划项目2010CB951901,国家自然科学基金资助项目41105049、40821092,国家高技术研究发展计划(863计划)项目2010AA012401 （863计划）
