玉溪太阳能辐射资源分布特征

THE DISTRIBUTION OF SOLAR RADIATION RESOURCE OF YUXI

玉溪市太阳能辐射量资源丰富,1960~2009年平均日照时数在2 286.3~2 085.3小时,每天平均日照6小时,冬春季由于晴天多,日照最丰富;盛夏雨日多,日照最小,秋季因经常出现连阴雨天气,日照也相对较小。最大值出现在春季的3月,平均日照8.5小时,最小值出现在盛夏的7月,平均日照仅2.6小时。玉溪太阳能辐射量为57.615×108~52.55×108kJ/m2,资源从东北向西南递增,最丰富的地方主要集中在元江、新平县,其次是江川、通海县,最小是澄江县。20世纪80年代末以后,由于观测场周围环境污染和建筑物的增多增高,对太阳能辐射观测值带来较大影响,使气象站实际观测到的日照小于20世纪80年代以前,并且较不稳定。

Yuxi City is rich in resources of solar radiation,from 1960 to 2009,the annual average sunshine hours is 2286.3 hours-2085.3 hours in between,the day average is 6 hours.As many clear days in winter and spring,sunshine is the most abundant during that time.Relatively,it is the least in midsummer because of many rain days.Sunshine is also relatively little in autumn as there are continuous rainy days.The maximum is 8.5 hours day average,and is occurrence in March.The Minimum is in July,and is only 2.6 hours day average.The energy of solar radiation is 52.55×108 kJ/m2 to 57.615×108 kJ/m2.The resource is progressively increasing from northeast to southwest.It is the most abundant in Yuanjiang and Xinping,the next is Jiangchuan and Tonghai,the least is Chengjiang.Since the last of 1980s,because of the environmental pollution around the observation sites and the increasing height and number of buildings,the observation value of solar radiation is markedly impacted.The actual time of sunshine observed by weather station is less than the days before 1980s,and the value is less stable.