4-6月江淮流域不同尺度温带气旋发展率及移动特征
投稿时间: 2017-07-03  最后修改时间: 2017-07-25  点此下载全文
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作者单位E-mail
王黎娟 南京信息工程大学 wljfw@163.com 
张海燕 南京信息工程大学大气科学学院  
陈爽 南京信息工程大学  
基金项目:国家自然科学基金项目(面上项目)
中文摘要:基于改进的温带气旋客观识别方法统计分析近30年4-6月不同空间尺度江淮流域温带气旋的发展率及移动特征。结果表明:1)气旋发展率整体呈先上升后下降趋势,而较大空间尺度气旋则为显著上升趋势,中间尺度气旋发展率变化趋势则几乎不变。2)较大尺度气旋源地集中分布在湖北湖南交界,而中间尺度气旋则位于安徽等江淮东部区域,各尺度气旋源地分布在整层大气非绝热加热项的大值区内。3)气旋初生阶段,江淮流域存在风速切变线,淮北地区风速小于淮南地区的风速,江淮上空对流层低层为负距平,中高层为正距平,为浅薄低压系统。4)不论何种尺度气旋,都存在东移和东北移路径,但较大尺度气旋东北移路径比例较大。
中文关键词:江淮流域  温带气旋  不同空间尺度  发展率  移动特征
 
Characteristics of Development Rate and Movement of Multi-scale Cyclones in the Changjiang River-Huaihe River Valleys between April and June
Abstract:Based on improved extratropical cyclone objective recognition method, characteristics of development rate and movement of multi-scale cyclones between April and June over the past 30 years in the Changjiang River-Huaihe River valleys (CHV) are investigated. The results show that the development rates of cyclones upgrade firstly than descending latter tendency, while the bigger-scale cyclones rise significantly and the middle-scale cyclones nearly stay the same. As for the source of cyclones, the bigger-scale cyclones are focused on the border of Hunan-Hubei, while that of middle scale is located in eastern CHV. The source of cyclones located in the area of greater value of the whole atmosphere layer diabatic heating. There are shear line with the smaller speed in the northern CHV during the early stage of cyclongenesis. Besides, geopotential height anomaly is negative in the lower troposphere and positive at high level, so cyclones in the CHV are shallow systems. No matter what scale cyclones, there are east and northeast moving paths, but the proportion of northeast moving path in the larger-scale cyclones increased.
keywords:CHV  extratropical cyclones  different spatial scales  development rates  moving characteristics
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