OBJECTIVE CLASSIFICATION OF THE TRACKS OF TROPICAL STORMS IN THE BAY OF BENGAL

An objective analysis of tropical cyclone tracks is performed, with which the tracks of 131 tropical storms (TSs) in 1972-2011 are separated into three types that move west-, north- and northwestward, denoted as Types A, B and C, respectively. Type A (21 TSs and 16% of total) has the origin in the southwestern Bay of Bengal, with the TS in a unimodal distribution as its seasonal feature, occurring mainly in autumn; 18 of the 21 TSs (taking up 90%) land mostly on the western Bay coast (west of 85°E); 5% of Type-A TSs attains the wind speed of >42.7 to 48.9 m/s. Type A has little or no effect on Tibet. Type B (74 TSs, 56.6% of the total) has its preferable origin in the central Bay of Bengal, with the TS in a bimodal distribution as its seasonal pattern. This type denotes the travel in the north in spring, with the landfall of 67 of the 74 TSs (accounting for 91%) mainly on the middle coast of the Bay (85° to 95°E), and 19% of the TSs reaching the wind velocity of >42.7 to 48.9 m/s, which exert great effect on Tibet and it is this TS track that gives strong precipitation on its way through this region. Type C (36 TSs, 27.5% of the total) has its main origin in the southern part of the bay, and these TSs are formed largely in autumn, moving in the northwest direction, and 23 of the 36 TSs (64%) land mostly on the western Bay coast, lasting for a longer time, with almost no impact upon Tibet.     

树立危机意识、把握发展机遇、提升公共气象服务的社会效益和经济效益

西藏气象部门立足本地实际，因地制宜，扬长避短，积极稳妥地推进西藏气象科技服务发展。至今已有十多年的发展历程，气象科技服务经过艰难的探索和实践，从无到有，从单一的常规预报服务到根据用户的特殊需求制作的专业、专项预报服务再扩大到气象工程服务。气象科技服务对气象现代化建设和气象事业快速发展起到积极的推进和支撑作用。     

气象服务文档的自动化生成

1 气象服务文档自动化生成的设计思路 目前大部分的气象信息文档以Word进行编辑和处理,并且Office软件支持各种编程语言的再开发,尤其是其自带了一套寄生式的语言VBA（Visual Basic Application）,这给编程带来了极大的便利。但是VBA功能很弱,不能脱离所依附的宿主程序环境,不能被编译为独立的可执行文件,给程序运行带来了很大的不便利。相比之下,     

孟加拉湾热带风暴活动路径的客观分类

利用热带气旋路径客观分析方法,将1972—2011年间共131个孟加拉湾热带风暴的移动路径分为3类：西行(A类)、北行(B类)和西北行(C类)。类型A主要生成于孟加拉湾西南部,占全部TS的16%(21次),季节分布为单峰型,主要在秋季,有90%(18次)登陆,登陆点大部分为孟加拉湾海岸西段(85 °E以西),有5%达到2级飓风以上强度,对西藏基本没有影响;类型B主要生成于孟加拉湾中部,约占全部TS的56.6%(74次),是主要的风暴移动路径,呈双峰型季节分布,是春季TS的主要路径类型,有91%(67次)登陆,登陆点大部分为孟湾海岸中段(85～95 °E),有19%达到2级飓风以上强度,对西藏影响最大,是造成西藏强降水的主要TS路径类型;类型C主要生成于孟加拉湾南部,约占全部TS的27.5%(36次),主要形成于秋季,是冬季TS的主要路径类型,有64%(23次)登陆,大部分在西段登陆,持续时间较长,对西藏影响很小。