敦煌戈壁地区净辐射变化特征  

Study on Variation of Net Radiation in the Dunhuang Gobi

作　　者：王超[1] 韦志刚[1] 李振朝[1] 刘慧[1] 魏红[1] 

机构地区：[1]中国科学院寒旱区陆面过程与气候变化重点实验室中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《干旱区研究》2012年第2期251-256,共6页Arid Zone Research

基　　金：国家重点基础研究发展计划项目(2009CB421402);国家自然科学基金项目(40730952;40875045)资助

摘　　要：利用敦煌双墩子戈壁试验站2008年12月至2009年12月的塔站观测资料,分析该地区净辐射的概率分布、日变化、年变化和典型天气下的变化特征,结果表明:①净辐射在-100～0 W/m2之间存在一个明显的峰值分布区间,其年平均净辐射为43.88 W/m2;②净辐射有明显的日变化规律,最大值出现在正午,最小值出现在日落后,净辐射日变化的季节差异明显;③在晴天、阴天和沙尘天气条件下,净辐射变化特征差别较大,变化规律、极值大小和到达极值时间均不相同,不同天气下的净辐射有其各自特殊性。In this paper,the probability distribution,daily and annual variation of net radiation and its change under typical weather conditions were analyzed based on the field-observed data at Shangdunzi Gobi Experiment Station in Dunhuang during the period from December 2008 to December 2009.The results are as follows：（1） There was an obvious peak distribution of net radiation in the range of-100-0 W/m2,and the average annual net radiation was 43.88 W/m2;（2） There was an obvious daily variation of net radiation,the net radiation was positive in daytime but negative at night,its maximum occurred at midday,and its minimum occurred at sunset.Seasonal difference of net radiation was obvious,the net radiation was the highest in summer and the lowest in winter;（3） Net radiation was quite different under different weather conditions including sunny,cloudy and sandstorm days.

关 键 词：戈壁 陆面过程 太阳活动 净辐射 敦煌 

分 类 号：P422.1[天文地球—大气科学及气象学]