基于QuikSCAT卫星遥感风场的台风最大风速半径反演及个例分析

建立了一种卫星遥感风场的最大风速半径(Rmax )反演方法.该方法基于 QuikSCAT 风场,结合 JTWC 台风参数资料,将遥感平均风剖面与 Holland 台风模型进行最小二乘法拟合来反演 Rmax.2001-2009年13个台风69幅数据反演结果统计分析表明:用气压表征台风强度的 P 算法遥感反演结果与 JTWC 分析结果的标准差为10.7 km,效果较好.此外,通过0513、0519和0221 3个典型台风过程的 Rmax 演变情况分析表明:对于对称性结构较好的成熟台风,反演结果能较好地反映出不同台风的 Rmax 尺寸差别,台风过程中 Rmax 的演变情况符合台风发展情况;台风风场对称性差、地形以及背景流场的影响,是导致 Rmax 反演出现较大偏差主要因素.

Retrieving the radius of maximum wind of typhoon from QuikSCAT wind fields and case analysis

The radius of maximum wind,R_max,was retrieved from QuikSCAT remote sensing wind fields as well as JTWC tropical cyclone best track data by fitting the averaged wind profile of QuikSCAT to Holland typhoon model using least square method.The results of 69 wind fields during 13 typhoons from 2001 to 2009 showed that,the R_max retrieved from QuikSCAT was quite well,and the standard deviation of R_max between QuikSCAT retrieved and JTWC published was 10.7km.The analysis of the evolvement of R_max during typhoon 0513,0519 and 0221 life cycle showed:for mature typhoon with circular symmetry wind filed structure,the QuikSCAT retrieved R_max reflected the differences in size for different typhoon cases,and the evolvement of R_max was consistent with the development of typhoon.Asymmetry wind filed structure,the influence of terrain or background current were the main error factors for retrieving R_max.