利用我国CINRAD/SA多普勒天气雷达资料与ARPS模式(Advanced Regional Prediction System)的资料分析系统ADAS(ARPS Data Analysis System),对初始场进行调整,并应用于WRF(Weather Research and Forecas-ting Model)模式,对2003年梅雨期...利用我国CINRAD/SA多普勒天气雷达资料与ARPS模式(Advanced Regional Prediction System)的资料分析系统ADAS(ARPS Data Analysis System),对初始场进行调整,并应用于WRF(Weather Research and Forecas-ting Model)模式,对2003年梅雨期淮河流域两次典型致洪暴雨过程进行模拟试验。对模拟结果的对比分析和检验结果表明:引入雷达资料后,在雷达观测区的整层风场和水汽场都随之调整,雷达径向风和反射率因子资料对初始场调整有不同影响,径向风资料侧重于对风场的调整,而反射率因子资料侧重于对温、湿量场的调整,使降雨落区和强度预报都有所提高;在ADAS系统中,雷达径向风和反射率因子资料对初始场调整有不同影响,径向风资料侧重于对风场的调整,而反射率因子资料侧重于对温、湿量场的调整,两个个例的试验表明,加入雷达径向风资料的模拟试验能够得到较好评分,加入雷达反射率因子资料或同时加入这两种雷达资料也能够在一定程度上提高模拟的准确性。展开更多
The strong heavy rainfall on 3–5 July 2003 causing the severe flooding in Huaihe River basin （HRB）, China is studied. It is noted that there are sometimes mesoscale convective vortex （MCV） in East Asia during the...The strong heavy rainfall on 3–5 July 2003 causing the severe flooding in Huaihe River basin （HRB）, China is studied. It is noted that there are sometimes mesoscale convective vortex （MCV） in East Asia during the mei-yu season. Simulation results from the ARPS （Advanced Regional Prediction） data analysis system （ADAS） and WRF model were used to study the development of the mesoscale convective system （MCS） and mesoscale convective vortex （MCV）. It is confirmed that the MCV formed during the development of a previous severe MCS. A closed vortex circulation can be found below 600 hPa with a vorticity maximum in the middle troposphere. The evolution process of the MCV can be divided into three stages： initiation, maturation, and dissipation. During the mature stage of the MCV, a downdraft occurred in the center of the MCV and new convection developed in southeast of the MCV. The convergence and the tilting in the lower troposphere convergence and vertical advection in the middle troposphere were the main vorticity sources in the MCV initiation stage. Finally, a conceptual model between the mei-yu front and the embedded MCS and MCV is proposed. The mei-yu front was the background condition for the development of the MCS and MCV. A low level jet （LLJ） transported moisture and the weak cold air invasion via a trough aloft in the middle troposphere and triggering the severe convection. Furthermore, the intensified jet was able to result in the initiation of new ＂secondary＂ areas of convection in the eastern part of the MCV.展开更多
文摘利用我国CINRAD/SA多普勒天气雷达资料与ARPS模式(Advanced Regional Prediction System)的资料分析系统ADAS(ARPS Data Analysis System),对初始场进行调整,并应用于WRF(Weather Research and Forecas-ting Model)模式,对2003年梅雨期淮河流域两次典型致洪暴雨过程进行模拟试验。对模拟结果的对比分析和检验结果表明:引入雷达资料后,在雷达观测区的整层风场和水汽场都随之调整,雷达径向风和反射率因子资料对初始场调整有不同影响,径向风资料侧重于对风场的调整,而反射率因子资料侧重于对温、湿量场的调整,使降雨落区和强度预报都有所提高;在ADAS系统中,雷达径向风和反射率因子资料对初始场调整有不同影响,径向风资料侧重于对风场的调整,而反射率因子资料侧重于对温、湿量场的调整,两个个例的试验表明,加入雷达径向风资料的模拟试验能够得到较好评分,加入雷达反射率因子资料或同时加入这两种雷达资料也能够在一定程度上提高模拟的准确性。
基金supported by the project of State Key Labo-ratory of Severe Weather, Chinese Academy of Meteoro-logical Sciences (No. 2009LASW-A03) the National Natural Science Foundation of China under Grants Nos.40875021 and 40930951
文摘The strong heavy rainfall on 3–5 July 2003 causing the severe flooding in Huaihe River basin （HRB）, China is studied. It is noted that there are sometimes mesoscale convective vortex （MCV） in East Asia during the mei-yu season. Simulation results from the ARPS （Advanced Regional Prediction） data analysis system （ADAS） and WRF model were used to study the development of the mesoscale convective system （MCS） and mesoscale convective vortex （MCV）. It is confirmed that the MCV formed during the development of a previous severe MCS. A closed vortex circulation can be found below 600 hPa with a vorticity maximum in the middle troposphere. The evolution process of the MCV can be divided into three stages： initiation, maturation, and dissipation. During the mature stage of the MCV, a downdraft occurred in the center of the MCV and new convection developed in southeast of the MCV. The convergence and the tilting in the lower troposphere convergence and vertical advection in the middle troposphere were the main vorticity sources in the MCV initiation stage. Finally, a conceptual model between the mei-yu front and the embedded MCS and MCV is proposed. The mei-yu front was the background condition for the development of the MCS and MCV. A low level jet （LLJ） transported moisture and the weak cold air invasion via a trough aloft in the middle troposphere and triggering the severe convection. Furthermore, the intensified jet was able to result in the initiation of new ＂secondary＂ areas of convection in the eastern part of the MCV.
