摘要
LAPS(Local Analysis and Prediction System)采用物理初值化与三维变分约束相结合的方法,通过融合多源观测资料,发挥各种资料的优势,分析得到较为客观的三维云场,并可改善数值模式初始场。将FY-2E卫星可见光反照率和红外亮温资料引入LAPS,针对2014年6月登陆我国的台风"海贝思",设计不同水平分辨率的同化试验,研究台风三维云结构和初始场的改善情况。结果表明:1)LAPS云分析中引入卫星可见光反照率资料之后,总云量有显著的调整,能够较清晰地分辨出台风眼区、云墙和螺旋云带,卫星红外亮温资料在云顶高度的调整中发挥了重要作用,而且高分辨率的云分析结果有助于更好地分析出台风结构和强对流区域。2)LAPS物理初值化技术将卫星资料中的云结构和微物理信息添加到初始场中,一定程度上调整了数值模式初始场中垂直速度、云水、云冰和水汽场等变量的分布,提高了模式初值质量,对模拟和预报台风系统将会产生一定的影响。
The FY-2E satellite visible albedo and infrared brightness temperature were adopted to LAPS （Local Analysis and Prediction System）in order to improve initial field quality in the typhoon“Haibeisi” simulation experiments. The results showed： 1）The total cloud cover magnitude presented significant adjustment and helped to clearly distinguish the field of typhoon eye, wall cloud and spiral band due to the application of satellite visible albedo to the cloud analysis of LAPS. Satellite infrared brightness temperature played an important role on the improvement of cloud-top height, and the high-resolution results were propitious to analyze typhoon structure and severe convection field. 2） The application of physical initialization technique of LAPS to add the cloud structure and microphysical information of satellite data into initial field could partly improve the distribution of vertical velocity, cloud water, cloud ice and water vapor, which enhanced the quality of model initial value, and effected the modeling and forecasting results of typhoon system.
出处
《气象与减灾研究》
2014年第3期7-16,共10页
Meteorology and Disaster Reduction Research
基金
国家自然科学基金项目(编号:41175046)
