Spatial and temporal variations of light rain even

Authors: Gang Huang GuanHuan Wen

Publish Date: 2013/01/13

Volume: 58, Issue: 12, Pages: 1402-1411

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Abstract

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 midhigh 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 30/10 a in summer and winter half years Over Northwest China an increasing trend of 41/10 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 midhigh 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 longterm increase in light rain events over North America and Southern Europe as well as Northwest China except in summer half years and a longterm 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 atmospheric static stability associated with global warming and EOF2s are possibly linked to the AMOThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team

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