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华中区域极端降水天气形势及物理量异常度特征*
钟敏, 车钦, 张蒙蒙, 董良鹏, 张萍萍, 陈璇
(武汉中心气象台)
Characteristics of Extreme Precipitation Weather Situation and Physical Anomaly in Central China
Zhong Min, che qin, zhang meng meng, dong liang peng, zhang ping ping, chen xuan
(Wuhan Central Meterological Observatory)
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投稿时间:2018-10-16    修订日期:2019-12-28
中文摘要: 本文选取1960-2012年间共139例极端降水个例,对其降水特征、天气形势及物理量异常度进行了分类对比研究,得出以下结论:(1)华中区域极端降水主要发生在四种不同的天气形势下,即纬向型、经向型、台风西风带冷槽结合型和短波槽前低涡暖切型,其个例占比分别为42.4%,30.2%,17.3%,10.1%。(2)台风西风带冷槽结合型在暴雨站数、极端降水站数、极端雨量平均值均居四类最大,纬向型和经向型次之,短波槽前低涡暖切型最小。(3)低层水汽辐合、中低层上升速度、低层风场辐合及气旋性涡度,高层风场辐散和大气可降水量的异常比例超过50%,是极端降水物理量异常的共性特征。个性特征为纬向型500 hPa比湿异常比例较高,经向型中低层暖平流异常比例较高,台风西风带冷槽结合型500 hPa正涡度平流和中低层比湿异常比例较高,短波槽前低涡暖切型与其他类比异常量更集中于边界层且大气可降水量异常比例低。此外,极端降水预报除了要关注物理量异常程度,降水的持续时间也是重要因素之一。
Abstract:139 extreme precipitation cases from 1960 to 2012 are selected to study the characteristics of precipitation, weather situation and abnormal degree of physical quantity.The following conclusions are drawn: (1) The extreme precipitation in central China mainly occurs in four different weather situations, namely, the zonal type, the meridional type, the Typhoon and cold trough combined type and short wave trough with warm shear type. the proportion are 42.4%, 30.2%, 17.3% and 10.1% respectively. (2) Typhoon and cold trough combined type is the largest in the four types of heavy rain stations, extreme precipitation stations and the extreme rainfall, followed by the zonal type and the meridional type, and the short wave trough with warm shear type is lowest.(3)The Anomaly ratio of low-level water vapor convergence, mid-low-level rising velocity, low-level wind convergence and cyclonic vorticity, high-level wind divergence and Atmospheric Precipitable Water exceed 50% are the common characteristics of extreme precipitation anomalies. The characteristics of personality are that the anomaly ratio of 500 hPa specific humidity in the zonal type is higher, the anomaly ratio of warm advection in the meridional type is higher, the anomaly ratio of 500 hPa positive vorticity advection and specific humidity in the Typhoon and cold trough combined type is higher, and in the short wave trough with warm shear type, the abnormal physical quantity is more concentrated in the boundary layer,and the abnormal proportion of Atmospheric Precipitable Water is low. In addition, besides paying attention to the degree of abnormal physical quantities, the duration of precipitation is also one of the important factors in extreme precipitation prediction.
文章编号:201810160456     中图分类号:    文献标志码:
基金项目:公益性行业(气象)科研专项(GYHY201306011)《异常强降水概念模型及诊断方法研究》
引用文本:
钟敏,车钦,张蒙蒙,董良鹏,张萍萍,陈璇,2019.[en_title][J].Meteor Mon,():-.
Zhong Min,che qin,zhang meng meng,dong liang peng,zhang ping ping,chen xuan,2019.Characteristics of Extreme Precipitation Weather Situation and Physical Anomaly in Central China[J].Meteor Mon,():-.