摘要
利用常规观测资料、卫星资料、自动站资料以及NCEP再分析资料等,对2008年12号台风"鹦鹉"的偏心结构进行分析。结果表明:(1)台风活动期间,对流层高层形势稳定,500hPa副高环流比较强盛,有利于台风沿着副高南侧的偏东气流稳定往西北移动。(2)500hPa副高压的下沉气流削弱了台风中心偏北象限上升气流,对流发展向上伸展的高度受限,抑制了台风中心北部云系的发展。华北槽后干冷的气流阻断了台风东侧的暖湿气流的往西往北输送,而南海北部和北部湾西南季风为台风中心的南部补充水汽和能量,使台风中心南部、西部对流发展旺盛;抬升速度中心随高度向低纬倾斜,台风中心以北的500hPa以上高空上升气流微弱,登陆后高、低层的台风低压环流开始出现分离,500hPa台风低压环流向偏西方向偏移,是台风偏心结构的重要原因。
Basing observational data, satellite data, AWS data and NCEP reanalysis data, etc, the eccentric structure of Typhoon ＂ Nuri＂ in 2008 was analyzed. The results show：（1） The relatively strong subtropical high circulation of 500hPa help typhoon move towards northwest along easterly air of the south of subtropical high. （2） The subsiding air of 500hPa subtropical high weakens the updraft of typhoon＇s north quadrant, inhibiting the cloud development in the northern. The dry and cold air in North China blocks warm and humid air in east of the typhoon to transport towards northwest, while the southwest monsoon from Northern South China Sea and the Beibu Gulf add moisture and energy to the southern of typhoon center. It makes the convection in south and west of typhoon center stronger. The uplift velocity centers slope to low latitude with height increasing.That low-pressure circulation of the typhoon in high and low level （in 500hPa） begin to separate （move west） after landing is the important causes of the eccentric structure of the typhoon.
出处
《气象研究与应用》
2011年第3期27-30,I0003,共5页
Journal of Meteorological Research and Application
关键词
台风
“鹦鹉”
暴雨
不对称结构
Typhoon
＂ Nuri＂
Rainstorm
Eccentric structure
