气象学报2012，Vol.70Issue(4)：717-727,11.
热带气旋远距离暴雨的研究
A study on the mechanism of the tropical cyclone remote precipitation
摘要
Abstract
Based on CMA 24 h precipitation data, JTWC's best track data set of tropical cyclones and the NCEP reanalysis data, the mechanism of the Tropical Cyclone Remote Precipitation (TRP) has been discussed. The statistical analysis shows that 14. 7% tropical cyclones could produce the TRP events (TRPs) in 1971 - 2006. Majority of the events would last more than two days. A number of TRPs have the feature of wide distribution and high rainfall rate. High frequency of TRPs occurs in July and August. The statistical analysis also shows that there are two areas with the high frequency of TRPs, i. e, the area of encircling Bo Hai Sea (region Ⅰ ) and the juncture area between Sichuan and Shaanxi provinces (region Ⅱ). The diagnostic study with inter-comparison between the two group data of TRPs and Non-TRPs indicates that the prominent differences in lower levels either in region Ⅰ or Ⅱ lay in that there exists the typhoon interaction with a westerly trough in TRP group and without a westerly trough in Non-TRP group but with the dry northwesterly flow instead. More over, it is found that tropical cyclones with TRP have strong southeast wet flow channel connected and Non-TRP cyclones without such channel. Obvious differences are also appeared in the upper level. In region Ⅰ , the jet stream is located to the north of the remote rainfall region, and it incurs the divergence and ascending motion for TRP. However, the upper level jet stream covers the region and induces the descending motion in the same region for Non-TRP. Similar results are showed in the region Ⅱ . The composite data analysis of the moisture fluxes budget in region Ⅰ and Ⅱ shows that tropical cyclones with TRP can transport moisture to reach the region Ⅰ and Ⅱ and moisture transport form the cyclones without TRP is restricted only in a local area. The moisture increases remarkably form the area of TRP. On the contrary, moisture decreases obviously in the same area without TRP. Moisture transport of a tropical cyclone plays an important role in TRP.关键词
热带气旋远距离暴雨/合成对比分析/水汽输送Key words
Tropical cyclone remote precipitation, Comparison composite data analysis, Moisture transport分类
天文与地球科学引用本文复制引用
丛春华,陈联寿,雷小途,李英..热带气旋远距离暴雨的研究[J].气象学报,2012,70(4):717-727,11.基金项目
国家重点基础研究发展计划(973计划)项目(2009CB421504)、国家自然科学基金项目(40730948、40675033、40975032)、上海台风研究基金课题(2009ST09)和山东省气象局重点课题(2009SDQXZ02). （973计划）
