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气象:2023,49(9):1108-1118
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2022年盛夏重庆不同阶段高温特征及成因对比
罗娟,邓承之,朱岩,夏蘩,庞玥,朱浩楠
(中国气象局气候资源经济转化重点开放实验室,重庆 401147; 重庆市气象台,重庆 401147; 重庆市气候中心,重庆 401147)
Comparison on Characteristics and Causes at Different Stages of the Extreme Heat Event in Chongqing in the 2022 Midsummer
LUO Juan,DENG Chengzhi,ZHU Yan,XIA Fan,PANG Yue,ZHU Haonan
(CMA Economic Transformation of Climate Resources Key Laboratory, Chongqing 401147; Chongqing Meteorological Observatory, Chongqing 401147; Chongqing Climate Center, Chongqing 401147)
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投稿时间:2023-03-02    修订日期:2023-08-13
中文摘要: 2022年盛夏,重庆地区出现了两段高温天气,两段高温均为先大陆高压、后副热带高压控制下形成的。利用地面观测资料和ERA5再分析资料,对比分析了重庆大陆高压阶段和副热带高压阶段的高温特征差异。结果表明:大陆高压持续时间短,为高温发展阶段,高温强度弱、相对湿度大、气温日较差大;副热带高压持续时间长,为高温强盛阶段,高温极端性强,干热特征显著、夜间升温明显。热力学方程诊断表明,大陆高压阶段,增温为非绝热加热和垂直运动项共同作用;副热带高压阶段,白天增温主要源于非绝热加热,其次为温度平流项,垂直运动项作用弱,夜间低空干绝热或超绝热层减弱消失,翻越云贵高原的下沉气流带来的增温效应显著增强。地表热力差异表明,副热带高压阶段较大陆高压阶段地表潜热通量下降,感热通量显著上升,地表感热直接加热大气,对地面增温作用明显。
Abstract:Two extreme heat events, caused sequentially by continental high and subtropical high, occurred in Chongqing in the midsummer of 2022. Based on surface observation data and ERA5 reanalysis data, the differences in high temperature characteristics between the two stages dominated by continental high and subtropical high are compared and analyzed. The results show that during the short stage of continental high domination, the heating process was developing with less intensity, high relative humidity and bigger diurnal temperature range. During the long stage of subtropical high domination, the heat event exhibited great extremity, grew severe with pronounced xerothermic characteristics and nocturnal warming. The diagnosis of thermodynamic equation reveals that when the continental high was dominant, diabatic heating and vertical motion jointly contributed to the warming, while when subtropical high set in, diabatic heating and heat advection became the primary and secondary factors for the diurnal warming, and the contribution of vertical motion became insignificant. At night, as the dry adiabatic or super-adiabatic layer at lower level abated and vanished, the warming effect induced by downward motion on the northern side of Yunnan-Guizhou Plateau drastically intensified. The surface thermodynamic difference suggests that the surface latent heat flux decreased and sensible heat flux increased significantly under the domination of subtropical high than under the continental high. The increasing surface sensible heat directly heated the atmosphere, intensively driving up the surface temperature.
文章编号:     中图分类号:P448,P466    文献标志码:
基金项目:中国气象局创新发展专项(CXFZ2022J011)、中国气象局复盘总结专项(FPZJ2023-106)、重庆市气象部门业务技术攻关项目(YWJSGG-202201)和重庆市气象局青年基金项目(QNJJ-202317)共同资助
引用文本:
罗娟,邓承之,朱岩,夏蘩,庞玥,朱浩楠,2023.2022年盛夏重庆不同阶段高温特征及成因对比[J].气象,49(9):1108-1118.
LUO Juan,DENG Chengzhi,ZHU Yan,XIA Fan,PANG Yue,ZHU Haonan,2023.Comparison on Characteristics and Causes at Different Stages of the Extreme Heat Event in Chongqing in the 2022 Midsummer[J].Meteor Mon,49(9):1108-1118.