青藏高原地表蒸发与高原低涡降水的联系  

Relationship between Evaporation on Tibetan Plateau and the Tibetan Plateau Vortex Precipitation

作　　者：汪庆丽 范广洲 WANG Qingli;FAN Guangzhou(School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Joint Laboratory of Climate and Environment Change,Chengdu University of Information Technology,Chengdu 610225,China;Shiyan Meteorological Service,Shiyan 442000,China)

机构地区：[1]成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室/气候与环境变化联合实验室,成都610225 [2]湖北省十堰市气象局,十堰442000

出　　处：《高原山地气象研究》2024年第4期21-29,共9页Plateau and Mountain Meteorology Research

基　　金：国家自然科学基金项目(42075019,42075081);第二次青藏高原综合科学考察研究项目(2019QZKK010203)。

摘　　要：本文基于全球陆地数据同化系统(Global Land Data Assimilation System,GLDAS)中NOAH CLM模型下的逐月地表蒸发资料,结合APHRODITE降水资料和ERA5再分析资料,对1981—2015年青藏高原地表蒸发与高原低涡降水的联系进行分析。结果表明:(1)青藏高原地表蒸发与高原低涡降水呈显著正相关关系,即当青藏高原整体蒸发偏弱时,高原中部低涡降水偏少,而高原整体蒸发偏强时,高原主体低涡降水偏多。(2)高原地表蒸发和低涡降水高值年,500 hPa涡度为正异常,配合南北气流辐合,加强了高原南部气旋性环流,有利于水汽向高原输送,促进高原水汽通量辐合,为高原低涡降水提供水汽条件。200 hPa偏强的西风急流,使垂直运动和高层辐散环流加强,利于高原低涡生成,高原东部的反气旋环流使南亚高压位置偏东且强度加强,高原水循环更为活跃,高原低涡更易产生降水。(3)高原地表蒸发和高原低涡降水偏强时,低涡生成地地表通量偏强,有利于高原低涡生成并在源地产生降水,同时高原整体土壤湿度异常增加,也利于高原低涡进一步发展并产生更多降水。Based on NOAH CLM monthly surface evaporation data of Global Land Data Assimilation System(GLDAS),combined with APHRODITE precipitation data and ERA5 reanalysis data sets,the relationship between evaporation on the Tibetan Plateau(TP)and Tibetan Plateau Vortex(TPV)precipitation from 1981 to 2015 was analyzed.The results show that:(1)There is a significant positive cor-relation between the surface evaporation of the TP and the precipitation of the TPV,that is,when the whole evaporation of the TP is weak,the precipitation of the TPV in the middle of TP is less,but when the evaporation of the whole plateau is strong,the precipitation of TPV in the main part of TP is more.(2)In the year of high value of surface evaporation and TPV precipitation on the plateau,the vorticity at 500 hPa is positive abnormaly.Combined with the convergence of north and south airflow,the cyclonic circulation in the south of TP is strengthened,which is beneficial to the transport of water vapor to the TP,makes the water vapor flux converge,and provides water vapor conditions for the TPV precipitation.The strong westerly jet at 200 hPa strengthens the vertical motion and the upper divergent circulation,which is beneficial to the formation of TPV.The anticyclone circulation in the eastern part of TP makes the position of the South Asia High eastward,the intensity is strengthened,the plateau water cycle is more active,and the TPV is easier to precipitation.(3)When the surface evaporation of TP and the precipitation of the TPV are strong,the surface flux in the source area of TPV is strong,which is benefi-cial to the generation of the TPV and the TPV precipitation in the source region.At the same time,the abnormal increase of the overall soil moisture of the whole TP is also beneficial to the further development of the TPV and the generation of more precipitation.

关 键 词：蒸发 高原低涡 青藏高原 奇异值分解 

分 类 号：P426.2[天文地球—大气科学及气象学] P447