欧亚积雪异常分布对冬季大气环流的影响I.观测研究  

The Effects of Eurasian Snow Cover Anomaly on Winter Atmospheric General Circulation Part I. Observational Studies

作　　者：陈海山[1] 孙照渤[1] 

机构地区：[1]南京气象学院大气科学系,南京210044

出　　处：《大气科学》2003年第3期304-316,共13页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目G1 9980 4 0 90 1-3;江苏省气象灾害和环境变化重点开放实验室课题KJS0 2 1 0 7共同资助

摘　　要：利用ECMWF 1 979～ 1 993年 2 5°× 2 5°的网格点积雪深度资料、中国气象局整编的海平面气压、 5 0 0hPa高度场和NCEP再分析资料 ,探讨了欧亚冬季积雪异常对同期大气环流的影响。结果表明 :( 1 )欧亚中高纬冬季积雪面积与同期大气环流具有密切的联系 :积雪面积为正 (负 )异常时 ,冬季 5 0 0hPa高度场对应正 (负 )欧亚—太平洋 (简称EUP)遥相关型 ,东亚冬季风活动偏强 (弱 )。 ( 2 )诊断结果表明 ,积雪异常与大气环流之间的密切联系在一定程度上反映了冬季积雪的异常分布可能对大气EUP遥相关型和东亚冬季风活动产生影响。 ( 3)SVD分析得到的冬季积雪的异常分布与同期大气环流的耦合模态 ,证实了前面所得结果。The effects of Eurasian winter snow anomaly on atmospheric general circulation was investigated by using the ECMWF 2.5°×2.5° snow depth (1979～1993) and NCEP/NCAR reanalysis data. Results show: (1) the anomalous winter snow cover in the extratropical Eurasian continent bears an intimate relation to the anomaly of contemporary atmospheric general circulation, i.e., the positive anomaly of winter snow cover usually is followed positive atmospheric Eurasia-Pacific teleconnection pattern and stronger East Asian winter monsoon; or vice versa. (2) The relationship between the anomalous snow cover and atmospheric general circulation suggested the facts that the anomaly of winter snow cover have an important impacts on winter 500 hPa height and winter atmospheric general circulation, especially on Eurasia-Pacific pattern due to the cooling effect of abnormal snow cover. (3) The coupling relationship by using singular value decomposition (SVD) analysis arrives at the same conclusion.

关 键 词：积雪 异常分布 大气环流 东亚冬季风 

分 类 号：P434[天文地球—大气科学及气象学] P426.635