| 1999年北京持续高温天气过程的诊断分析 |
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| 引用本文： | 吴振鹏,武 媛,李乃杰,等.1999年北京持续高温天气过程的诊断分析[J].气象与环境科学,2016,39(1):82-88. |
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| 作者姓名： | 吴振鹏 武 媛 李乃杰 等 |
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| 作者单位： | 1.广州市气象信息网络中心，广州 510000； 2.北京市昌平区气象局，北京 102200；3.北京市气象服务中心，北京 100089； 4.中国人民解放军94826部队气象室，上海 200433 |
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| 摘 要： | 利用北京观象台观测资料和NCEP/NCAR再分析数据，对1999年6月24日至7月2日北京一次持续性高温天气的演变和发展过程及非绝热加热作用对系统的影响进行诊断分析，结果表明：在此次高温天气发生前，欧亚大陆中高纬度环流经向度很大，欧洲北部和贝加尔湖以南为高压脊控制，中亚和我国东北地区则处于低压槽内。贝加尔湖南部的高压脊纬向延伸范围较广，在东移过程中长时间影响北京。随着贝加尔湖以南的高压脊逐渐东移，北京上空下沉增温与非绝热加热作用有所增强，北京逐渐受到高温天气影响。在高温天气发生的后半阶段，我国东北的低压槽入海后在120130°E附近维持并发展，槽前非绝热加热率很大。从垂直方向来看，加热率在500 hPa以下随高度迅速增加，根据全型涡度方程，强烈的非绝热加热率垂直分布不均作为一个明显的涡度源区，对入海低压槽的稳定维持有显著的作用。而入海低压槽的稳定维持，又阻碍了华北高压脊的东移，使其在北京地区长时间稳定少动，为北京带来多日的持续性高温天气。
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| 关 键 词： | 持续性高温天气 全型涡度方程 华北高压脊 |
Diagnostic Analysis of Beijing Persistent High Temperature in 1999 |
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| Wu Zhenpeng,Wu Yuan,Li Naijie,et al.Diagnostic Analysis of Beijing Persistent High Temperature in 1999[J].Meteorological and Environmental Sciences,2016,39(1):82-88. |
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| Authors: | Wu Zhenpeng Wu Yuan Li Naijie |
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| Abstract: | In order to research the evolution of persistent high temperature (PHT) in Beijing from 24th June to 2nd July 1999 and the impact of diabatic heating, the observation data and NCEP/NCAR reanalysis data are analyzed. The results show that: before the occurring of the PHT, the areas from north Europe to southern Baikal were controlled by pressure ridge, accompany with the pressure trough occupied the Central Asia and Northeast China. The pressure ridge on southern Baikal had wide stretch in zonal direction, when it moved eastern, the effect of subsidence warming and diabatic heating increased over Beijing, Beijing was affected by high temperature gradually, and affected for a long time. In the later stage of PHT, the pressure trough which located in Northeast China moved eastward to the Pacific maintained and developed over 120°E to 130°E with intense release of diabatic heating. The diabatic heating increased rapidly with the increasing of altitude below 500 hPa. According to the complete form vertical vorticity tendency equation, the uneven vertical distribution of diabatic heating, as a obvious vorticity source, have remarkable affects on the maintaining of the pressure trough over the sea. Because of the pressure trough, the North China pressure ridge steadily located over Beijing and induced the severe PHT. |
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| Keywords: | persistent high temperature complete form vertical vorticity tendency equation North China pressure ridge |
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