摘要
基于8个站点1961年以来的长期太阳辐射及其它气象观测数据,通过线性回归、相关分析等方法,探讨近半个世纪以来中国东南部太阳辐射的变化特征,并分析了太阳辐射变化的影响因素以及对区域气候的影响。结果表明:该地区地表总太阳辐射自1961年以来呈下降趋势,变化率为-10.17MJ·m-2·a-1。太阳辐射下降主要集中在1961到1990年间,该时间段的下降趋势达到-39.43MJ·m-2·a-1,主要表现为直接辐射显著下降,散射辐射则变化不大;1990年代以后,地表总太阳辐射开始呈现上升趋势,变化率为13.21MJ·m-2·a-1。该地区太阳辐射变化与全球范围内太阳辐射"变暗"及"变亮"的变化是一致的。从云量对太阳辐射的作用来看,该地区太阳辐射的变化很有可能是受到低云量变化的影响;而太阳辐射的这种变化直接导致气温发生变化,使得最高气温和最低气温的变化出现不一致,日较差随之发生改变。
Solar radiation is the primary energy source for life on our planet.For a better understanding of solar radiation and climate change in southeastern China,solar irradiance and related meteorological data from 8 stations from 1961 to 2008 were selected to study the variation characteristics,affecting factors,and climate forcing of solar radiation in this region.The data were analyzed through linear regression and correlation analysis.The result reveals a decreasing trend in solar radiation from 1961 to 1990 which did not continue after 1990s,coinciding with the＂global dimming＂and＂global brightening＂.The＂regional dimming＂rate was-39.43 MJ·m-2·a-1and＂brightening＂rate was 13.21 MJ·m-2·a-1.The change in the total cloud amount does not seem to be the direct cause for the observed solar radiation decrement.Nevertheless,our analysis shows a high correlation between low cloud amount and solar radiation,suggesting that the low cloud amount is responsible for the observed solar radiation changes.Surface air temperatures, especially the daily maximum temperature,are largely influenced by solar radiation.During the 1961-1990 period,daily maximum and mean temperatures were cooler because of less radiation.But daily minimum temperature showed a slightly increasing trend due to the impact of greenhouse effect,resulting in a smaller diurnal temperature range.When the radiation reversed from dimming to brightening,not only surface air temperature warmed dramatically,but also daily maximum temperature increased faster than minimum temperature,leading a larger diurnal temperature range.
出处
《生态环境学报》
CSCD
北大核心
2010年第5期1119-1124,共6页
Ecology and Environmental Sciences
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-BR-03)
中国科学院知识创新工程青年人才领域前沿项目(09l4401d10)
中国科学院知识创新工程青年人才领域前沿项目(07l4151d40)
关键词
太阳辐射
日照时数
云量
气候变化
中国东南部
solar radiation
sunshine duration
cloud
climate change
southeastern China
