多种再分析资料中热带气旋潜在生成指数分析  

Analysis of tropical cyclone genesis potential index with multiple reanalysis data

作　　者：邓诗茹[1] 吴立广[1] 王瑞芳[1] 王超[1] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044

出　　处：《气象科学》2014年第3期243-251,共9页Journal of the Meteorological Sciences

基　　金：国家重点基础研究发展计划(2009CB421503)

摘　　要：根据7套再分析资料计算的热带气旋潜在生成指数(GPI),分析了GPI对西北太平洋区域台风盛季(7—9月)热带气旋生成的表征能力。结果表明,虽然这些再分析资料计算得到的GPI的空间分布与观测的热带气旋生成特征都比较一致。但是,在时间变化上7套再分析资料计算的GPI对观测热带气旋生成的表征能力差异较大,其中ERA-40(欧州中期天气预报中心再分析资料)和MERRA(美国国家航空和航天局研究和应用再分析资料)的GPI与观测的相关系数较高。进一步分析表明,各套资料GPI之间时间变化的差异主要来自相对湿度,而ERA-40和MERRA的GPI与观测值有较高的相关系数,也与相对湿度有密切关系。The tropical cyclone genesis potential index （GPI） in the northwestern Pacific basin is calculated based on seven reanalysis datasets during peak season of tropical cyclone （July-September）. Although spatial distributions of GPI derived from the datasets are consistent with the observed tropical cyclone genesis characteristic, the time series of GPI are quite different, among which the correlation co- efficient of observed tropical cyclone genesis with GPI derived from MERRA and ERA-40 is higher. Fur- ther, research reveals that the differences in time series of GPI are mainly due to relative humidity in sev- en reanalysis datasets. The higher correlation coefficient of observed tropical cyclone genesis with GPI from ERA-40 and MERRA can be explained by the same reason.

关 键 词：热带气旋 潜在生成指数 再分析资料 

分 类 号：P444[天文地球—大气科学及气象学]