2007~2014年中国区域地表辐射特征研究

Study on the Characteristics of Downward Shortwave Radiation in China from 2007 to 2014

本文利用2007~2014年间的向下短波辐射同化数据集和欧洲中心的云量(低云量、总云量)数据集,对中国区域向下短波辐射短期空间变化特征及低云量、总云量对向下短波辐射变化特征的影响,主要得出以下结论:1) 中国区域向下短波辐射在2007~2014年间大体呈“先减后增”趋势,8a间辐射变化幅度不大。2) 向下短波辐射随季节变化较为显著,辐射强度季节变化趋势大体呈现夏季最高,冬季最低的特征。3) 中国区域向下短波辐射在空间分布上呈现东西分布差异,即由东部地区向西部地区,向下短波辐射呈现增加的趋势;西部地区的地表太阳辐射在纬度上有较为明显的变化,随纬度增加而降低,表现出一定的纬度地带性分布。4) 云量(低云量、总云量)对中国区域向下短波辐射变化影响较为显著,呈现出一定的负相关关系,总云量的变化是影响向下短波辐射增加或减少的首要因素。

This paper uses the downward shortwave radiation assimilation data set from 2007 to 2014 and the cloud cover (low cloud cover and total cloud cover) data set in the European Center to analyze the short-term spatial variation characteristics of low surface cover and low cloud cover and total cloud in China. The impact of the amount on the downward radiation characteristics of the surface mainly draws the following conclusions: 1) The downward radiation of the regional in China showed a trend of “decrease first and then increase” from 2007 to 2014, and the radiation change range between 8a was not large. 2) The downward radiation changes significantly with the seasons. The trend of the entire season is high in summer and lowest in winter. 3) The regional downward shortwave radiation in China shows a difference in spatial distribution from east to west, that is, the downward shortwave radiation from the eastern region to the western region shows an increasing trend;the surface solar radiation in the western region has a more obvious change in latitude, with The latitude increases and decreases, showing a certain latitude zonal distribution. 4) The cloud cover (low cloud cover, total cloud cover) has a significant effect on the downward shortwave radiation change of the surface in China, showing a certain negative correlation. The change in the total cloud cover is the increase downward shortwave radiation or the main factor of reduction.