摘要
利用1998-2012年重庆市34个站点逐时降水观测资料,分析了重庆地区高时空分辨率卫星产品(Tropical Rainfall Measuring Mission,TRMM;Climate Prediction Center morphing technique,CMORPH)和再分析资料(ECMWF Re-Analysis Interim,ERAIN;Modern-Era Retrospective Analysis for Research and Applications,MERRA;Climate Forecast System Reanalysis,CFSR;Japanese 55-year Reanalysis,JRA55)的可靠性,并进一步对卫星和再分析资料降水日变化的准确性进行了评估。结果表明,再分析数据总体上高估了重庆的日降水量。在重庆西南和东南部,TRMM比较接近观测数据。CMORPH在东北部表现最好,低估了其他地区的降水量。就降水量而言,卫星资料的结果好于再分析资料。对于日平均降水强度和降水频率,卫星资料的分布形态与观测资料差异较大,再分析资料与观测则较为一致。观测资料中降水峰值多出现在午夜,沿着西南至东北方向有滞后现象。卫星资料各降水要素(PA,PI和PF)也表现出由西南至东北方向峰值时间滞后的现象。对于不同地形特征上的降水日变化,卫星和再分析资料的表现有明显差距,尤其是在夏季山地地区,再分析资料高估了12:00-17:00(北京时)的降水。
The hourly precipitation data observed at 34 gauge stations in Chongqing during 1998-2012 is com‐pared with the satellite products[Tropical Rainfall Measuring Mission(TRMM),Climate Prediction Center morphing technique(CMORPH)]and reanalysis data[ECMWF Re-Analysis Interim(ERAIN),Modern-Era Retrospective Analysis for Research and Applications(MERRA),Climate Forecast System Reanalysis(CF‐SR),Japanese 55-year Reanalysis(JRA55)].The reliability of the precipitation products in high spatiotemporal resolution is analyzed,and the accuracy in diurnal variation is also evaluated.The results show the daily precipi‐tation in Chongqing is generally overestimated by the reanalysis data while the satellite products show agreement with the observations.TRMM is accurate and close to the observational data in the southwest and southeast.CMORPH works best in the northeast while underestimates the rainfall in the other areas.There are evident dif‐ferences in precipitation intensity and frequency between the satellite and observational data,while the reanalysis data appears to be in agreement with the observations.The peak time of precipitation diurnal variation is mostly from midnight to dawn and displays a hysteresis from the southwest to northeast.The precipitation amount(PA),intensity(PI)and frequency(PF)in the satellite products show the hysteresis from the southwest to northeast,too.There is significant difference in diurnal cycle of precipitation between the reanalysis and satellite data over complex terrain.The reanalysis data overestimates the precipitation from 12:00 to 17:00(Beijing time),especial‐ly in the mountainous areas in summer.
作者
闫燕
刘罡
何军
方德贤
吴钲
陈少颖
汤剑平
YAN Yan;LIU Gang;HE Jun;FANG Dexian;WU Zheng;CHEN Shaoying;TANG Jianping(School of Atmospheric Sciences,Nanjing University,Nanjing 210023,Jiangsu,China;Chongqing Meteorological Observatory,Chongqing 401147,China;Chongqing Institute of Meteorological Sciences,Chongqing 401147,China)
出处
《高原气象》
CSCD
北大核心
2020年第3期594-608,共15页
Plateau Meteorology
基金
国家重点研究发展计划项目(2018YFA0606003,2016YFA0600303)
国家自然科学基金项目(41875124)。
关键词
降水
卫星资料
再分析资料
评估
Precipitation
satellite data
reanalysis data
assessment
