资源科学 ›› 2017, Vol. 39 ›› Issue (11): 2141-2152.doi: 10.18402/resci.2017.11.12

• 气候资源 • 上一篇    下一篇

江苏梅汛期不同天气背景水汽特征量分析

刘梅, 王磊, 陈圣劼, 吴海英   

  1. 江苏省气象台,南京 210008
  • 收稿日期:2017-02-10 修回日期:2017-09-12 出版日期:2017-11-20 发布日期:2017-11-20
  • 通讯作者: 王磊,E-mail:29184751@qq.com
  • 作者简介:刘梅,女,江苏丰县人,硕士,正研级高级工程师,主要研究方向为梅雨期暴雨预测。E-mail:lmkerry@163.com
  • 基金资助:
    江苏省自然科学基金面上研究项目(BK20161604)

Moisture characteristics analysis of different weather backgrounds in Plum Flood Season in Jiangsu

LIU Mei, WANG Lei, CHEN Shengjie, WU Haiying   

  1. Jiangsu Meteorological Observatory,Nanjing 210008,China
  • Received:2017-02-10 Revised:2017-09-12 Online:2017-11-20 Published:2017-11-20

摘要: 本文利用2010—2014年6—7月逐日ERA再分析资料(0.75°×0.75°),以及2010—2015年6—7月江苏71个基本站点降水实况观测资料、24个地基GPS遥感监测数据反演PWV资料,对江苏梅汛期不同背景的水汽特征量对比探讨,分析结果表明,不同天气背景下水汽特征量反映不同,相对湿度和有无降水关系较好,比湿与PWV均可用于判断降水量级大小,并制定了不同降水量级所对应比湿与PWV值判断指标,梅汛期暴雨过程平均PWV值均在60mm左右,较弱降水过程高10mm左右,无降水天气一般在30~33mm。江苏不同区域暴雨过程中PWV空间分布呈现明显差异,当全省PWV均较高时,暴雨出现在江苏北部地区,仅沿江苏南PWV较大时,暴雨出现在江苏南部地区,暴雨区与PWV大值区相对应。不同区域暴雨区均出现在相对湿度大值区与水汽含量高值重叠区域,但南北不同区域暴雨过程中湿度和大气中水汽含量分布型态不同,在此基础上建立了江苏不同区域暴雨形势与水汽配置图。

关键词: 暴雨, 不同天气背景, 江苏, 梅汛期, 水汽特征量

Abstract: By using June and July daily ERA reanalysis data (0.75°×0.75°)from 2010 to 2014,observation data of rainfall at each station and precipitable water vapor (PWV)data from GPS monitoring in Jiangsu from 2010 to 2015,we examine the vapor characteristics in different weather backgrounds of flood seasons by contrastive analysis methods. Results show that vapor characteristic quantities have different functions in different weather backgrounds. Relative humidity is related to rainfall. Specific humidity and PWV can be used to determine the amount of precipitation. The judgement indexes of different rainfall levels correspond to specific humidity and PWV value given in the paper. The average amount of PWV is about 60mm when the storm rain is observed in Plum Flood Season. The value is 10mm higher than that of weak precipitation. In addition,the average amount of PWV is 30-33mm for no-rain weather. Spatial distribution of rainstorm PWV presents obvious difference in different parts of Jiangsu. Heavy rain area is found in the north of Jiangsu when PWV value is high throughout the province. The area with high PWV value is the heavy rain region when PWV value is high only in the south of Jiangsu. The rainstorm area corresponds to the area with high PWV value. Heavy rain is observed in the overlay region of high relative humidity and high moisture. The distribution type of humidity and vapor content in Jiang-Huai region in the process of heavy rain is different in the above two regions. On this basis,the structure diagrams of situation and vapor during storm rain in different parts of Jiangsu are compiled.

Key words: different weather situations, heavy rain, Jiangsu, moisture characteristics, Plum Flood Season