摘要
针对数值预报初始场的热带气旋普遍偏弱,BOGUS技术不能提供气旋内部中小尺度结构信息的问题,提出了热带气旋自同化技术,利用初始场中的热带气旋风场和台风报文中的7级和10级风圈半径,构建人造热带气旋风场,并利用3维变分同化方法得到新的初始场。该方法的优点是在获得新的初始场中尽可能保留背景场中热带气旋的风场结构信息,同时又使气旋得到加强。从4个个例的72 h模拟试验结果表明,自同化方法取得了较好的效果,结果优于BDA方法。且该方法简单易行,具有一定的业务应用价值。
In view of the fact that the intensity of tropical cyclones（TCs） in NWP initial field is always weaker than the observation and the inability of BOGUS technique to describe the mesoscale and microscale structures of TCs, a self data assimilation（SDA） technique is presented in this paper. The new TC initial field is determined by assimilating the artificial TC wind field, which is obtained by using the TC wind in the background field and real Class-7 and Class-10 wind radii. The SDA method not only intensifies the TC but also retains as much as possible information about the wind structures of TCs in the background field. Our studies of four TC cases show that the SDA is a method that is more effective than the BDA. The SDA technique is simple and applicable and can be easily used in operational TC forecast systems.
出处
《热带气象学报》
CSCD
北大核心
2010年第2期181-186,共6页
Journal of Tropical Meteorology
基金
浙江省重大科技专项(2007C13G1610002)
国家重点基础研究发展计划资助项目(2009CB421505)
浙江省自然科学基金项目(Y505286)共同资助
关键词
天气预报
自同化
BDA
热带气旋
weather forecast
self data assimilation
BDA
tropical cyclone
作者简介
通讯作者：郝世峰，男，河北省人，硕士，高级工程师，主要从事数值预报的研究。E-mail：shifenghao@yahoo．com．cn
