| 成都地区一次持续性暴雨过程的水汽特征分析 |
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| 引用本文： | 王明明,魏鸣,王皓,王建森.成都地区一次持续性暴雨过程的水汽特征分析[J].大气科学学报,2018,41(6):861-871. |
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| 作者姓名： | 王明明 魏鸣 王皓 王建森 |
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| 作者单位： | 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 江苏 南京 210044;浙江省大气探测技术保障中心, 浙江 杭州 310018,南京信息工程大学 气象灾害预报预警与评估协同创新中心, 江苏 南京 210044,成都信息工程大学 电子工程学院, 四川 成都 610225,浙江省大气探测技术保障中心, 浙江 杭州 310018 |
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| 基金项目： | 国家自然科学基金资助项目（41675029;41405036）;国家重点基础研究发展计划（973计划）项目（2013CB430102）;地理信息科学教育部重点实验室开放研究项目（KLGIS2015A01）;中国气象科学研究院灾害天气国家重点实验室开放课题（2016LASW-B12） |
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| 摘 要： | 利用地基GPS技术反演得到的大气可降水量资料、FY-2C卫星水汽图以及NCEP 1°×1°再分析资料,分析了2008年9月23—26日成都地区一次持续性暴雨的水汽特征。结果表明,降雨期间的水汽主要由来自孟加拉湾的暖湿气流和来自"黑格比"台风的高低空急流组成;暴雨发生前对流层中低层水汽充足,大气层结极不稳定,水平风的垂直切变较明显;高时间分辨率的地基GPS资料不仅可获得水汽实时变化的信息,而且对于暴雨发生时间和暴雨强度都有一定的指示性;结合中尺度数值模拟的结果,发现此次暴雨过程中可降水量的变化能反映区域水汽辐合辐散的变化,降水与否或降水大小不仅取决于大气中水汽含量的多少,更受到大气动力和热力条件的影响,水汽辐合的强弱具有关键作用。
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| 关 键 词： | 地基GPS 可降水量 大气垂直结构特征 数值模式 水汽输送 |
| 收稿时间： | 2016/4/10 0:00:00 |
| 修稿时间： | 2016/10/21 0:00:00 |
An analysis of the characteristics of the water vapor during a persistent rainstorm event in Chengdu |
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| WANG Mingming,WEI Ming,WANG Hao and WANG Jianseng.An analysis of the characteristics of the water vapor during a persistent rainstorm event in Chengdu[J].大气科学学报,2018,41(6):861-871. |
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| Authors: | WANG Mingming WEI Ming WANG Hao and WANG Jianseng |
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| Institution: | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China;Zhejiang Atmospheric sounding Technology Safeguard Center, Hangzhou 310018, China,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China,College of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China and Zhejiang Atmospheric sounding Technology Safeguard Center, Hangzhou 310018, China |
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| Abstract: | In this research study,ground-based GPS Perceptible Water Vapor(PWV) data,which was based on routine observational data,satellite images,and NECP 1°×1° reanalysis data,were used to examine a large-scale severe precipitation process which had occurred in Chengdu from September 23rd to 26th of 2008.It was found that the storm had been caused by a combination of cold air from the north,warm moist air from the Bay of Bengal,and the high and low torrents from a "Hagupit" typhoon.Prior to the rainstorm,the water vapor of the middle and lower troposphere was observed to be sufficient,and the atmospheric stratification was extremely unstable.In addition,vertical wind shear had been obvious.During the rainstorm period,the majority of the water vapor was concentrated in the 900 to 500 hPa layers,and was mainly composed of the warm wet air brought in by the southwest monsoons and cold air originating from a "Hagupit" typhoon in the South China Sea.The results of this study''s comparison of the satellite cloud data indicated that the heavy ground precipitation center was not only related to the entire layer of the water vapor transmission center,but also had a close relationship with the water vapor transmission intensity.It was observed that the larger the water vapor flux was,the greater the precipitation would be.Meanwhile,the GPS-PWV was also found to be sensitive to the strength of the water vapor transmission.For example,when the water vapor had reached a baseline,the probability of precipitation was greater.Also,the longer the water vapor amount had been maintained at a high-value stage,the longer the duration of the precipitation and the stronger the intensity would be.It was also determined that the maximum amount of precipitation was not necessarily consistent with the time that the peak precipitation had been reached.However,it was observed that the heaviest rainfall had usually occurred when the precipitation was in the fastest rising stage.The results of this study indicated that before and after the rainstorm event,the precipitation could be divided into increasing and decreasing stages,respectively.Therefore,the high temporal resolution observations of the ground-based GPS were able obtain the rapidly changing information of the water vapor,along with certain indications of the occurrence time and strength of the rainstorm event.This type of information could potentially play an important role in the real-time monitoring of the occurrences and development of rainstorm events in the future,and also provide important references for the future construction of ground-based GPS stations in the Chengdu area.In this study,when the findings were combined with the results of the mesoscale numerical simulation WRF,it was found that the examined rainstorm event was more dependent on various dynamical and thermodynamic conditions than on the values of the PWV.Furthermore,the strength of the moisture convergence had played a crucial role in the examined rainstorm event. |
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| Keywords: | ground-based GPS PWV vertical characteristics of atmospheric WRF model transfer of water vapor |
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