| 基于微波辐射计的盛夏短时强降雨水汽特征分析 |
| |
| 引用本文： | 张涛,韦玮,吴凌华.基于微波辐射计的盛夏短时强降雨水汽特征分析[J].高原山地气象研究,2020,40(1):49-55. |
| |
| 作者姓名： | 张涛 韦玮 吴凌华 |
| |
| 作者单位： | 四川省成都市气象局,成都 611130;海装驻成都地区第三军事代表室,成都 610000 |
| |
| 基金项目： | 国家自然科学基金(41705008)；中国气象局大气探测重点开放实验室开放课题(KLAS201713) |
| |
| 摘 要： | 利用RPG HATPRO-G4微波辐射计和自动气象站观测资料,研究盛夏时节成都地区短时强降雨的水汽密度(VD)、相对湿度(RH)、整层水汽含量(IWV)演变特征,并探讨微波辐射计资料在短时强降雨中的应用。结果表明:盛夏时节成都地区无论是发生阵雨还是短时强降雨时,大气中水汽条件均较好,地面VD达19±3g·m^-3,IWV在53kg·m^-2以上,1~3km高度RH≥90%。降雨开始前1h地面VD与2倍的500hPa高度VD之和是否达到26.3g·m^-3,可作为短时强降雨发生与否的指标,识别率达75%。短时强降雨发生前3h,持续的水汽辐合使3km高度处出现98%≤RH≤100%的湿层,该湿层随着降雨的临近而增厚,向下伸展至边界层。降雨刚发生时,4km以上相对湿度骤降,4km以下湿度略增加。降雨结束后,整层水汽含量会降低至与降雨发生前相近的值。
|
| 关 键 词： | 微波辐射计 短时强降雨 水汽密度 整层水汽含量 |
| 收稿时间： | 2020-03-24 |
Analysis of the Water Vapor Characteristics of Short-Time Heavy Rainfall in July and August Based on Microwave Radiometer Data |
| |
| ZHANG Tao,WEI Wei,WU Linghua.Analysis of the Water Vapor Characteristics of Short-Time Heavy Rainfall in July and August Based on Microwave Radiometer Data[J].Plateau and Mountain Meteorology Research,2020,40(1):49-55. |
| |
| Authors: | ZHANG Tao WEI Wei WU Linghua |
| |
| Institution: | 1. Chengdu Meteorological Bureau, Chengdu 611130, China;2. The third Military Representative Office of the Naval Equipment Department in Chengdu, Chengdu 610000, China |
| |
| Abstract: | Based on the observational data from RPG HATPRO-G4 microwave radiometer and automatic meteorological stations, the evolution characteristics of vapor density (VD), relative humidity (RH), and integrated water vapor (IWV) of July-August short-time heavy rain in Chengdu are studied. Applications of microwave radiometer data in short-time heavy rain are also discussed. Results showed that moisture conditions in both the shower and short-time heavy rainfall are good in July-August in Chengdu. Moisture conditions includes,near surface VD reach 19±3g·m-3, IWV is more than 53kg·m-2 and RH is greater than or equal to 90% at the height between 1km to 3km. Sum of the near surface VD and the 500-hPa VD 1 hour before the precipitation begins can be used as the indicator of occurrence of short-time heavy rain. When it greater than or equal to 26.3g·m-3, the distinguish rate reaches 75%. 3 hours before the short-time heavy rain begins, continuous convergence of water vapor form a wet layer(98%≤RH≤100%) at the height of 3km. Thickness of this wet layer increases as the rainfall approaches, and then stethches down to the boundary layer. At the beginning of the rainfall, RH drops sharply above 4km and RH increases slightly below 4km. IWV after the rainfall reduces to a value close to that before the rainfall. |
| |
| Keywords: | microwave radiometer short-time heavy rainfall vapor density integrated water vapor |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《高原山地气象研究》浏览原始摘要信息 |
| 点击此处可从《高原山地气象研究》下载免费的PDF全文 |
|
