青藏高原横变线的大气视水汽汇特征合成分析  

Composite analysis of the characteristics of atmospheric apparent moisture sinks along the horizontal shear lines over the Tibetan Plateau

作　　者：张硕 ZHANG Shuo(Beijing Institute of Applied Meteorology,Beijing 100029,China;State key Laboratory of Geo-information Engineering,Xi'an 710054,China)

机构地区：[1]北京应用气象研究所,北京100029 [2]地理信息工程国家重点实验室,陕西西安710054

出　　处：《测绘科学与工程》2021年第1期72-78,共7页Geomatics Science and Engineering

基　　金：国家重点研发计划资助项目(2018YFC1507203-01)。

摘　　要：本文利用1981-2016年6-8月每日4次,分辨率为1°×1°的欧洲中期天气预报中心再分析资料(ERA-Inter-im),采用合成分析方法,探究了青藏高原横切变线附近大气视水汽汇的分布和演变特征。结论如下:高原横切变线为水汽聚集带,当切变线附近水汽辐合增强,且在切变线东段形成一水汽辐合中心时,切变线发展增强;高原横切变线附近整层积分的高原大气视水汽汇呈现为“南高北低”的分布特征;当高原横切变线上东段视水汽汇强度增强时,切变线发展增强;当水汽由低层向中高层输送增强时,切变线也发展增强;在高原横切变线演变过程中,水汽的垂直输送项为视水汽汇的主要贡献项。Based on the four-times daily ERA-Interim reanalysis dataset in June-August during 1981-2016 with a reso-lution of 1°× 1°,the distribution and evolution characteristics of atmospheric moisture sink(Q2)near the horizontal shear line 0-ver the Tibetan Plateau(TPHSL)was studied using the composite analysis method.The main conclusions are as follows:TPHSL is the water vapor accumulation zone,and it developed and strengthened when the convergence of water vapor near TPHSL en-hanced;the plateau atmospheric moisture sinks in the whole layer(<Q2>)near TPHSL are higher in the south and lower in the north;TPHSL developed and strengthened when the moisture sink in the eastern section of TPHSL enhanced;when the water va-por was transported from the lower layer to the middle and upper layers,TPHSL also developed;during the evolution of TPHSL,the vertical transport of water vapor is the main contribution of the apparent moisture sink.

关 键 词：青藏高原横切变线 合成分析 高原大气视水汽汇色 特征 客观识别 

分 类 号：P44[天文地球—大气科学及气象学]