近50年来云贵高原太阳辐射变化特征及影响

到达地面的太阳辐射变化会对气候和生态环境产生较大影响。用云贵高原1961～2009年日射站辐射和气象观测资料，对多年来到达地面太阳总辐的年和季节变化趋势，及辐射变化对气候要素的影响进行了分析。结果表明：1961~1988年，总辐射呈明显下降趋势，之后发生逆转，1988~1994年总辐射呈显著上升趋势，1994年后其变化趋于缓和。总体呈现变暗－变亮－变缓的趋势。各季节总辐射变化的趋势为，秋季变化趋势极显著，春季变化的趋势显著，夏季变化的趋势较显著，冬季变化不明显。高原日照时数变化趋势与总辐射经历的变暗－变亮－变缓在时间上基本一致。总辐射变化对该地区的最高气温影响显著，但对蒸发量的影响不太明显。影响年辐射变化的各因子中，云量是影响高原总辐射变化的主要因素，相对湿度和能见度则影响较小

CHANGES IN SOLAR RADIATION AND THEIR CLIMATIC INFLUENCES OVER YUNNAN-GUIZHOU PLATEAU FOR 1961～2019

Changes of surface solar radiation largely affect climate and eco-environment.By using the observational data of solar radiation and other meteorological variables of 1961~2009 over Yunnan-Guizhou Plateau(YGP),several phenomenon were analyzed including the annual and seasonal variation trends of solar radiation in the period and the effects of radiation variations’ on climatic elements.It is found that the surface global radiation had a decreasing trend over 1961~1988 and an increasing trend after 1988.The increasing trend in global radiation was significant significantly during the period of 1988~1994 and became weak after 1994.The YGP experienced the dimming-lighting-weak lighting.The solar radiation over the YGP seasonally changed strong to weak from autumn,spring,summer to winter.The change trends,in time,were the same between sunshine duration and the course of dimming-lighting-weak lighting caused by solar radiation experience.Cloud cover was a key factor to impact solar radiation in high altitude region,but relative humidity and visibility had nothing to do with it.The effect of global radiation on the maximum temperature is significant,but on the evaporation was not obvious in the YGP.