Spatial and temporal variations of light rain events over China and the mid-high latitudes of the Northern Hemisphere  

作　　者：HUANG Gang WEN GuanHuan 

机构地区：[1]Key Laboratory of Regional Climate-Environment for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences [2]Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第12期1402-1411,共10页

基　　金：supported by the National Basic Research Program of China (2012CB955604 and 2011CB309704);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05090402);the National Natural Science Foundation of China (41275083)

摘　　要：Based on observed daily precipitation data, monthly gridded radiosonde upper air temperature and sea surface temperature data from the UK Met Office Hadley Centre, monthly surface air temperature from the Climatic Research Unit at the University of East Anglia and the NCEP/NCAR monthly reanalysis data, this study investigates the spatial and temporal variations of light rain events over China and the mid-high latitudes of the Northern Hemisphere during 1961-2010, and discusses the relationship between the change of light rain events and atmospheric stability, sea surface temperature and atmospheric circulation. The light rain events over East China display a decreasing trend of 3.0%/10 a in summer and winter half years. Over Northwest China, an increasing trend of 4.1%/10 a is found in winter half years, but there is no trend in summer half years. Using empirical orthogonal function (EOF) analysis, it is found that the first two principal components of light rain events over the mid-high latitudes of the Northern Hemisphere show long time scale variations in summer and winter half years. The first EOF modes (EOF1s) for summer and winter half years both depict a long-term increase in light rain events over North America and Southern Europe as well as Northwest China (except in summer half years), and a long-term decrease over most of the Eurasia (Central Europe, Eastern Europe, North Asia and East China). The second EOF mode (EOF2) for summer half year shows that light rain events increase over North America, Southern Europe and South China, but decrease over Eurasia north of 45°N from 1961 to early 1980s, while the trends reverse from late 1980s to 2010. The second EOF mode (EOF2) for winter half years indicates that light rain events increase over North America and South and North China, but decrease over Eurasia north of 40°N from 1961 to early 1980s, while the trends reverse from late 1980s to 2009. Correlation analysis and linear regression analysis suggest that EOF1s may be related to the change in atmosphBased on observed daily precipitation data, monthly gridded radiosonde upper air temperature and sea surface temperature data from the UK Met Office Hadley Centre, monthly surface air temperature from the Climatic Research Unit at the University of East Anglia and the NCEP/NCAR monthly reanalysis data, this study investigates the spatial and temporal variations of light rain events over China and the mid-high latitudes of the Northern Hemisphere during 1961-2010, and discusses the relationship between the change of light rain events and atmospheric stability, sea surface temperature and atmospheric circulation. The light rain events over East China display a decreasing trend of 3.0%/10 a in summer and winter half years. Over Northwest China, an increasing trend of 4.1%/10 a is found in winter half years, but there is no trend in summer half years. Using empirical orthogonal function （EOF） analysis, it is found that the first two principal components of light rain events over the mid-high latitudes of the Northern Hemisphere show long time scale variations in summer and winter half years. The first EOF modes （EOFls） for summer and winter half years both depict a long-term increase in light rain events over North America and Southern Europe as well as Northwest China （except in summer half years）, and a long-term decrease over most of the Eurasia （Central Europe, Eastern Europe, North Asia and East China）. The second EOF mode （EOF2） for summer half year shows that light rain events increase over North America, Southern Europe and South China, but decrease over Eurasia north of 45~N from 1961 to early 1980s, while the trends reverse from late 1980s to 2010. The second EOF mode （EOF2） for winter half years indicates that light rain events increase over North America and South and North China, but decrease over Eurasia north of 40~N from 1961 to early 1980s, while the trends reverse from late 1980s to 2009. Correlation analysis and linear regression analysis suggest that EOFls may be related to

关 键 词：中国东部地区 高纬度 北半球 事件 小雨 时空变化 中国西北地区 全球气候变暖 

分 类 号：P426.614[天文地球—大气科学及气象学]