Radar Reflectivity Derived Rain-storm Characteristics over Northern Thailand

EnvironmentAsia

关键词: Northern Thailand;    TITAN;    rain-storm;    thunderstorms;    weather radar;    radar reflectivity;    sounding data;   

DOI  :  

来源: DOAJ

【 摘 要 】

The radar data analysis in this study were to extract the radar reflectivity to individual rain-storms and present the study on rain-storm characteristics with their crucial features in northern Thailand over 80 days between April and August 2012. This study classified the two seasonal variations of rain-storm characteristics derived from Thunderstorm Identification and Tracking Analysis and Nowcasting (TITAN) algorithm including 11 variables of storm numbers, duration, volume, mass, sizes, maximum reflectivity and movement in the data set. Additionally, the study also evaluated statistically the relationship between storm characteristics and standard instability indices including lift index (LI) and convective available potential energy (CAPE).It can be seen that in summer season had a smaller number of storms but the storms were of longer average duration, greater maximum reflectivity as well as larger areas, volume and mass. Most rain-storms in both summer and rainy seasons were less than 2 hours and the storm altitudes (base to top height) were between around 2 and 8 km MSL. The storm velocity was not exceeding 20 km/hr and their movement was southeasterly wind accordingly along the north-south mountain ranges in northern Thailand. Storm area was the most important factor determining the convective weather in the large scale environment during summer season since it was illustrated the strongest correlation in both LI (negative; -0.67) and CAPE (positive; 0.65). Alternatively, the storm duration was the most important variable in wet season, which was exhibited the strongest correlation (0.68) with CAPE as well; moreover, no such strong correlation was found for LI.

【 授权许可】

Unknown