摘要
为了让TBB资料在台风降水短临预报上发挥更大的作用,利用国家卫星中心提供的FY-2E卫星云图逐时TBB资料,以及国家气象信息中心提供的逐小时降水资料,对海南岛受台风"1321"(蝴蝶)影响时的降水特征、TBB演变过程进行分析,得出一些TBB与降水的关系。通过分析得出:(1)台风减弱后引发的降水强度明显强于之前的引发降水强度。台风减弱后,西太平洋副热带高压边缘云系增强并且西进,云系稳定在海南岛上空,引发强降水。(2)当有降水发生时,强降水中心与TBB低值中心并不重合,而是位于TBB梯度较大处。通常冷云区面积增大,对应着较大范围的短时强降雨,并向着TBB梯度大的方向扩展。(3)强降水相对于TBB值在演变趋势上有一定的滞后性。降水主要发生在TBB由低值向高值增长的过程中。(4)定安站降水较大的原因是其能量聚集在一次过程中释放,所以降水很大。
To make better use of TBB data in short-term forecast of typhoon precipitation,the characteristics of precipitation and TBB are analyzed to reveal the relationship between them in the prod of typhoon ＂1321＂influenced Hainan Island by using the TBB grid data from the FY-2E satellite and hourly precipitation data from National Meteorological Information Center. The results show that the intensity of precipitation of landed typhoon is stronger than before landing.When the typhoon weakened,the clouds at the edge of West Pacific subtropical are enhancement and westward,and those clouds stabled over Hainan Island,triggered heavy precipitation. When precipitation happened,the heavy rain center doesn＇t coincide with TBB low center,but locates at the great value center of TBB gradient. Usually,the increasing of Cold cloud area corresponded to a wide range of short-term precipitation and Cold cloud area grows to large gradient. Precipitation mainly appeared in the process of TBB value from low to high. The energy released in one process was the reason why the heavy precipitation happened in Dingan.
出处
《成都信息工程大学学报》
2016年第4期408-412,共5页
Journal of Chengdu University of Information Technology
基金
国家重点基础研究发展计划资助项目(2015CB452806)
关键词
气象学
天气分析
台风
台风降水
TBB
meteorology
weather analysis
typhoon
typhoon precipitation
TBB
