【摘要】 利用华南地区1961—2003年的太阳总辐射、直接辐射和散射辐射资料分析了该地区地面太阳辐射状况,包括年际变化和季节变化,重点分析了该地区太阳总辐射在1980—1990年代期间的转折过程,并与全国平均状况进行对比。结果表明:1961—2003年,华南地区的总辐射和直接辐射整体呈下降趋势,散射辐射的变化不显著,与全国平均辐射状况的变化趋势一致。1983年之前,华南总辐射处于迅速下降阶段,之后发生转折开始回升,至2001年前后已经恢复到平均水平。华南地区总辐射和散射辐射的季节变化非常明显,夏季最高,春秋两季次之,冬季最低,一年中散射辐射的最高和最低值相比总辐射提前一个月出现。另外,结合云量和能见度资料初步分析了广州市地面太阳辐射的变化和转折过程,表明广州地面太阳总辐射的下降及转折过程主要与该地区的大气清洁程度相关。更多还原

【Abstract】 The trends of global radiation,direct horizontal radiation and diffuse radiation from 1961 to 2003 in South China were analyzed in this paper,which include annual and seasonal variation,and the transition of global radiation during 1980s to 1990s was emphasized.Results showed that global and direct radiation in South China decreased significantly form 1961 to 2003,while diffuse radiation varied indistinctively,which agree with an analysis of Chinese solar radiation variation.Global radiation in South China decreased before 1983.Afterward it took on a transition and began to increase.In 2001 it arrived at the average status between 1961 and 2003.The seasonal variations of global and diffuse radiation in South China were very significant,high in summer and low in winter.The maximum and minimum of diffuse radiation appeared a month earlier than that of global radiation during a year.The trends of solar radiation in Guangzhou city were also analyzed by looking into solar radiation,cloud,and visibility data.It was visibility,not cloud amount,which was closely concerned with the decrease and transition characteristics of global radiation of Guangzhou in past 40 years.Perhaps the local air cleanness would play an import part in long term variation of solar radiation.更多还原