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2019年盛夏最大降水环流成因分析

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  • NETL
  • NSTL
  • 万方数据
利用 1961-2020 年黑龙江省盛夏(7-8 月)降水量、NCAR/NCEP大气再分析和Nino34 SST资料,分析 2019 年盛夏黑龙江降水异常与ENSO事件背景下大尺度环流特征.结果表明:2019 年盛夏黑龙江省降水处于多水时段,ENSO暖事件多发期降水偏多发生的概率增加.指出了 2019 年降水特点主要受东北冷涡与 3 次台风北上相互作用,发生 6 次重大降水过程;500 hPa高度距平场为西北-东南向呈"+、-、+"形势;西太平洋副热带高压明显偏东,脊区向北伸展有利台风北上;低纬主要有 3 支强南风距平气流北上进入气旋环流,为维持台风暴雨提供充足水汽;黑龙江中部和东部地区最大上升气流速度出现在 600-300 hPa高度,也是台风活跃区,辐合明显,黑龙江省强降水出现在东部最大降水中心,落区位于三江平原北部鹤岗至萝北.
Causative Analysis of the Maximum Precipitation Circulation During the Peak Summer of 2019
Utilizing precipitation data from Heilongjiang Province during the peak summer months(July-August)of 1961-2020,atmospheric reanalysis from NCAR/NCEP,and Nino 3.4 SST data,this study analyzes the charac-teristics of large-scale circulation associated with the precipitation anomalies in Heilongjiang during the summer of 2019 under the backdrop of ENSO events.The findings indicate that the summer of 2019 in Heilongjiang ex-perienced a period of higher precipitation,with an increased likelihood of excessive rainfall during the frequent warm phases of ENSO.The precipitation characteristics of 2019 were predominantly influenced by the interaction of the Northeast Cold Vortex with three northward-moving typhoons,resulting in six major precipitation events.The 500 hPa geopotential height anomaly presented a northwest-southeast orientation in a"+,-,+"pattern;the Western Pacific Subtropical High was notably shifted eastward,extending northward which facilitated the north-ward movement of typhoons.At lower latitudes,three strong southward anomaly airflows moved north into the cy-clonic circulation,providing ample moisture for the typhoon-induced heavy rainfalls.The strongest upward air currents in Heilongjiang's central and eastern regions occurred between 600-300 hPa,coinciding with the active typhoon zone.This convergence was marked,with intense precipitation occurring in the eastern precipitation cen-ter of Heilongjiang,particularly over the northern part of the Sanjiang Plain from Hegang to Luobei.

2019 mid-summer heavy precipitationClimatic backgroundCombination of cold vortex and ty-phoonCauses of large-scale circulationPhysical quantity analysis

石红艳、杨宁、李凤毅、孙景文

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双鸭山市气象局,黑龙江 双鸭山 155100

黑龙江省气象服务中心,黑龙江 哈尔滨 150030

2019年盛夏强降水 气候背景 冷涡与台风结合 大尺度环流成因 物理量分析

黑龙江省气象局科技创新发展项目中央引导地方科技发展专项

HQZC2023027ZY18C12

2024

黑龙江气象
黑龙江省气象学会

黑龙江气象

影响因子：0.161
ISSN：1002-252X
年,卷(期)：2024.41(3)
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