2020年5月上旬粤东异常高温过程分析  

Analysis of a Process of Anomalously High Temperature in Eastern Guangdong Province in the First Ten Days of May,2020

作　　者：王洁瑜 陈映强 刘泳涛 WANG Jie-yu;CHEN Ying-qiang;LIU Yong-tao(Meteorological Bureau of Puning,Puning 515300)

机构地区：[1]普宁市气象局,广东普宁515300

出　　处：《广东气象》2021年第4期20-23,共4页Guangdong Meteorology

摘　　要：利用NCEP/NCAR再分析资料和粤东20个国家气象观测站常规气象资料对2020年5月上旬粤东地区出现的持续性异常高温天气过程进行分析。结果表明:(1)持续的强下沉气流是造成此次高温过程发生的主要原因,而南亚高压强度异常偏强、中心位置异常偏东以及西太平洋副高强度异常偏强、范围大为下沉气流的发生提供有利的大气环境背景场;(2)低层存在暖平流以及地面弱的风速使得粤东上空热量得以补充聚集,从而使得高温天气维持;(3)粤东地区上空存在高层辐合低层辐散的散度场抑制对流发生、较常年偏高的地表感热通量以及较常年偏低的潜热通量有利于近地面大气吸收更多热量,为高温天气的维持提供了另一有利条件。Using NCEP/NCAR reanalysis and conventional meteorological data from 20 national observation stations in eastern Guangdong province,this paper analyzes a persistent process of anomalously high temperature that occurred in this part of the province in the first ten days of May,2020.The result is shown as follows.(1)This high-temperature process was mainly caused by a persistent and intense downdraft,for which an anomalously strong high over South Asia,a western Pacific high with anomalously eastward central position and anomalously strong intensity,and an extensive downdraft provided a favorable background field of atmospheric circulation.(2)The presence of a low-level warm advection and a weak surface wind speed supplemented and accumulated heat over the eastern Guangdong province to keep the high-temperature weather.(3)The regional divergence field in which the upper level was convergent while the low level was divergent prohibited the generation of convection,a higher-than-the-average surface sensible heat flux and a lower-than-the-average latent heat flux made it possible for the near-surface atmospheric layer to absorb more heat,becoming another favorable condition for the high-temperature weather to persist.

关 键 词：天气学 异常高温 西太平洋副高 粤东 

分 类 号：P44[天文地球—大气科学及气象学]