三套再分析资料的中国夏季降水日变化特征

戴泽军; 宇如聪; 李建; 陈昊明

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DOI:10.7519/j.issn.1000-0526.2011.1.003

气象:2011,37(1):21-30

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三套再分析资料的中国夏季降水日变化特征

戴泽军^1,2, 宇如聪³, 李建³, 陈昊明³

(1.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室，北京 100029;2.中国科学院研究生院，北京 100039;3.中国气象科学研究院灾害天气国家重点实验室，北京 100081)

The Characteristics of Summer Precipitation Diurnal Variations in Three Reanalysis Datasets over China

DAI Zejun^1,2, YU Rucong³, LI Jian³, CHEN Haoming³

(1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,  Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;2.Graduate School of the Chinese Academy of Sciences, Beijing 100039;3.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081)

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投稿时间：2010-08-07 修订日期：2010-09-27

中文摘要: 利用台站观测降水，评估分析了三套再分析（NCEP，ERA40和JRA25）降水资料对中国夏季降水日变化的再现能力。结果表明，三套再分析资料呈现的中国夏季降水日变化特征较观测存在明显偏差。对比台站观测的白天（08—20,北京时）和夜间（20—08时）降水比例，再分析降水在大部分区域都表现为白天较夜间偏多，NCEP和ERA40在观测降水量最小的上午（08—14时）偏多更为明显，且NCEP模拟的白天和夜间的降水比例在西南地区与台站观测几乎相反。相比之下，三套再分析资料中，JRA25的降水量和降水频次的日变化与观测最为接近；NCEP的降水强度日变化最接近观测；ERA40可部分再现西南的夜雨特征。

中文关键词: 夏季降水，日变化，再分析资料

Abstract:The characteristics of summer precipitation diurnal variations in three reanalysis datasets (NCEP，ERA40 and JRA25) over China were analyzed by comparing with those in station rain gauge observations. Results show that the summer precipitation diurnal variations in the three reanalysis products all present obvious deficiencies. Analyzing the percentages of daytime and nighttime rainfall show that the percentage of the daytime (08-20 BT) rainfall to the whole day rainfall is larger than that of nocturnal (20-08 BT) rainfall〖HJ〗 in all reanalysis datasets over the most region of China while comparing with the station gauge data. Further analyses demonstrate that the percentage of the morning (08-14 BT) rainfall is the smallest in the station gauge data, but in NCEP and ERA40 products it is obviously more than that in the station observations. The proportion of the daytime rainfall to nocturnal rainfall in NCEP products over Southwest China is almost reverse to that of station rain gauge data. Generally, the diurnal variations of precipitation amount and frequency in JRA25 products and precipitation intensity in NCEP products are closest to the corresponding components in station data, but the nocturnal rainfall over Southwest China is only partly reproduced by ERA40 products.

keywords: summer precipitation, diurnal variations, reanalysis dataset

文章编号： 中图分类号： 文献标志码：

基金项目:国家重点基础研究发展计划（2010CB951900）和国家自然科学基金项目（40625014，40921003）共同资助

作者	单位
戴泽军	中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室，北京 100029 中国科学院研究生院，北京 100039
宇如聪	中国气象科学研究院灾害天气国家重点实验室，北京 100081
李建	中国气象科学研究院灾害天气国家重点实验室，北京 100081
陈昊明	中国气象科学研究院灾害天气国家重点实验室，北京 100081

Author Name	Affiliation
DAI Zejun	State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,  Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 Graduate School of the Chinese Academy of Sciences, Beijing 100039
YU Rucong	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
LI Jian	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
CHEN Haoming	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

引用文本：
戴泽军,宇如聪,李建,陈昊明,2011.三套再分析资料的中国夏季降水日变化特征[J].气象,37(1):21-30.
DAI Zejun,YU Rucong,LI Jian,CHEN Haoming,2011.The Characteristics of Summer Precipitation Diurnal Variations in Three Reanalysis Datasets over China[J].Meteor Mon,37(1):21-30.