CAJ | 학술논문

利用美国冰雪资料中心(The National Snow and Ice Data Center)提供的近40年逐周的卫星反演雪盖资料,考察了冬季欧亚大陆北部新增雪盖面积(Total Fresh Snow Extent,冬季T_(FSE))与我国夏季(6～8月)气候异常的关系.分析发现,冬季TFSE与我国夏季气候异常存在明显关联:当冬季T_(FSE)偏大时,夏季贝加尔湖以东易盛行异常冷低压,内蒙古东部和东北西部易出现凉夏,同时,东亚副热带西风急流增强,西太平洋副热带高压易加强且西伸和北扩,江南地区在副高的控制下易干热;冬季T_(FSE)偏小时的情况相反.这种显著关联独立于ENSO事件,并且在近40年来较为稳定;冬季T_(FSE)与我国江南夏季降水在20世纪90年代初均发生过一次十年际尺度变化,表现为在20世纪90年代初之后,冬季T_(FSE)(江南降水)明显减小(增多),同时,冬季T_(FSE)与江淮夏季降水的正相关关系明显增强.进一步的分析表明,冬季T_(FSE)可能通过某种途径来影响东亚副热带急流的变化,进而影响我国夏季气候异常.
이용미국빙설자료중심(The National Snow and Ice Data Center)제공적근40년축주적위성반연설개자료,고찰료동계구아대륙북부신증설개면적(Total Fresh Snow Extent,동계T_(FSE))여아국하계(6～8월)기후이상적관계.분석발현,동계TFSE여아국하계기후이상존재명현관련:당동계T_(FSE)편대시,하계패가이호이동역성행이상랭저압,내몽고동부화동북서부역출현량하,동시,동아부열대서풍급류증강,서태평양부열대고압역가강차서신화북확,강남지구재부고적공제하역간열;동계T_(FSE)편소시적정황상반.저충현저관련독립우ENSO사건,병차재근40년래교위은정;동계T_(FSE)여아국강남하계강수재20세기90년대초균발생과일차십년제척도변화,표현위재20세기90년대초지후,동계T_(FSE)(강남강수)명현감소(증다),동시,동계T_(FSE)여강회하계강수적정상관관계명현증강.진일보적분석표명,동계T_(FSE)가능통과모충도경래영향동아부열대급류적변화,진이영향아국하계기후이상.
Utilizing Version 3 NSIDC weekly snow cover data for the period of 1966-2005,the relationships between the increased snow cover in winter over Northern Eurasia(T_(FSE),Total Fresh Snow Extent)and the climate anomalies in summer(June-August)over China are investigated,which show not only the remarkable negative (positive)correlations with precipitation(temperature)in the south of the Yangtze River(SYR),but also the opposite correlations in the northeast of China.The detailed analysis reveals that:following heavy winter T_(FSE),there are statistically in summer an intensified anomalous low almost in the entire troposphere in the east of Baikal,an enhanced westerly jet in East Asia(EAWJ),and a strengthened subtropical high in the western Pacific(WPSH)which expands westward and northward to the SYR overhead,as well as weakened convection and vapor flux in the SYR Under these situations,the SYR region tends to be droughty and hot,and the northeast of China tends to be cold,vice versa.The analysis also shows that the correlations between winter T_(FSE) and summer climate anomalies in China are almost independent of ENSO and stable relatively in recent 40 years.But both the winter T_(FSE) and rainfall in the SYR exhibit a remarkable decadal climate shift at the beginning of the 1990s,in which the winter T_(FSE)(summer SYR rainfall)decreases(increases)obviously later than the early 1990s,and simultaneously,the correlation between winter Tfse and summer rainfall in the Huaihe River valley,just north of the Yangtze River,in China is also enhanced Further analysis explains that winter Tfse could lead to the summer climate anomalies in China by affecting EAWJ.