夏季长白山天池站降水量年际变化特征及其对应的环流异常  

Interannual Variation of Summer Rainfall at the Tianchi Station in the Changbai Mountains and its Associated Circulation Anomalies

作　　者：凌思宁 陈卫[1] 陆日宇[1,2] 高枞亭 LING Sining;CHEN Wei;LU Riyu;GAO Zongting(State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;Collage of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049;Institute of Meteorological Sciences of Jilin Province,Changchun,130062;Jilin Provincial Key Laboratory of Changbai Mountain Meteorology&Climate Change,Changchun,130062;Laboratory of Research for Middle-High Latitude Circulation and East Asian Monsoon,Changchun,130062)

机构地区：[1]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049 [3]吉林省气象科学研究所,长春130062 [4]长白山气象与气候变化吉林省重点实验室,长春130062 [5]中高纬度环流系统与东亚季风研究开放实验室,长春130062

出　　处：《大气科学》2021年第3期499-512,共14页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金项目41721004、41675078;中国科学院青年促进会项目2018102;国家重点研发项目2018YFC1507300;吉林省重点科技研发项目20180201035SF。

摘　　要：长白山地处吉林省东南部,作为国家级重点生态功能区,其降水变化特征对该地森林生态系统和水资源结构变化有重要影响。本文基于1979~2016年吉林省47个台站逐月降水资料,探究了长白山天池站夏季降水的气候特征及其相关的环流异常,并与吉林省降水进行对比。分析结果表明天池夏季降水量以及年际变率高出吉林省其它站点一倍左右。此外,天池降水年际变化对应的环流异常与吉林省降水一致,即6月东北亚气旋式异常和东亚高空急流的增强,以及7、8月西太平洋副热带高压增强和东亚高空西风急流偏北,均可引起吉林省和天池降水偏多。另一方面,天池降水变异还表现出其独特的环流异常,与吉林省降水对应的环流异常显著不同或者甚至近乎相反,究其原因为长白山地形所致。本文的结果说明山地的气候和大气环流的关系复杂、多变。The Changbai Mountains are located in the southeastern part of Jilin Province.Rainfall has a crucial effect on the forest ecosystem and water resource in the Changbai Mountains,which is a national key ecological function area.Based on the monthly precipitation data from 47 stations in Jilin Province and the ERA-Interim monthly reanalysis data from 1979 to 2016,we investigated the climate characteristics of summer precipitation at the Tianchi station in the Changbai Mountains and circulation anomalies associated with the interannual variation of rainfall at this station and compared the Tianchi station with the other stations in Jilin Province.Results show that summer precipitation at the Tianchi station and its interannual variation are approximately two times larger than that at other stations in Jilin Province.On one hand,the circulation anomalies associated with the interannual variation of precipitation at the Tianchi station are consistent with those for the entire Jilin Province.The circulation anomalies that favor more rainfall at the Tianchi station and the entire Jilin Province are characterized by a cyclonic anomaly over Northeast Asia and an enhanced East Asian jet stream in June and an enhanced western Pacific subtropical high and a northward-displaced East Asian jet stream in July and August.On the other hand,precipitation at the Tianchi station is associated with unique circulation anomalies,which are quite different or nearly opposite to precipitation in the entire Jilin Province,and can be attributed to the terrain of the Changbai Mountains.The results indicate that climate variability in the mountains can be related to the complicated and varying patterns of large-scale atmospheric circulation anomalies.

关 键 词：长白山天池 降水 年际变化 环流 夏季 

分 类 号：P461[天文地球—大气科学及气象学]