干旱区生态环境知识资源中心(Arid): 干旱区绿洲地表反照率不对称观测研究

Arid

	干旱区绿洲地表反照率不对称观测研究
其他题名	OBSERVATION STUDY ON DIURNAL ASYMMETRY IN SURFACE ALBEDO OF OASIS IN ARID REGION
	文莉娟; 吕世华; 陈世强; 孟宪红; 李锁锁; 奥银焕
ISSN	0254-0096
出版年	2009
卷号	30 期号:7 页码:953-956
中文摘要	利用"绿洲系统能量与水分循环观测试验"2005年第一阶段资料分析发现,绿洲的地表反照率并不是呈现关于太阳高度角的典型对称分布,早上的地表反照率略大于相同太阳高度角的下午,在太阳高度角30°附近早上比下午平均大0.031,约为平均反照率的13.3%.白天风速较小、风向变化不定的风场和当日的土壤湿度差异对地表反照率不对称的影响较小.早晚地表反照率差异主要是由于绿洲内空气较为湿润、夜晚风速较小、气温下降形成的露水在早上增大对太阳辐射的散射造成的.而在日出后露水迅速蒸发,在太阳高度角为40°～50°,上午和下午的地表反照率基本重合.
英文摘要	By utilizing data observed in the first phase of "The Oasis System Energy and Water Cycle Field Experiment" in 2005, surface albedo of oasis was analyzed. Results showed that surface albedo is asymmetric about the solar elevation angle. Surface albedo in the early morning is bigger than that in the late afternoon. Morning/afternoon surface albedo difference is about 0.031 which is 13.3% of the average surface albedo at the 30°solar elevation angle. The diurnal asymmetry of surface albedo is less influenced by the diurnal difference of soil moisture and the wind field which has the small speed and irregular direction. Because of the plenty of vapor, the low temperature and the small wind speed at night, the dew easily formed in oasis. Trie surface albedo difference between the morning and the afternoon is mainly due to the dew which increased the capability of scatter to solar radiation in the morning. After sunrise the dew quickly evaporated and the albedo began to be symmetric about the solar elevation angle between 40°and 50°.
中文关键词	地表反照率 ; 不对称 ; 太阳高度角 ; 露水
英文关键词	surface albedo asymmetry solar elevation angle dew
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENERGY FUELS
WOS研究方向	Energy & Fuels
CSCD记录号	CSCD:3609449
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224257
作者单位	中国科学院寒区旱区环境与工程研究所, 甘肃省干旱气候变化与减灾重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	文莉娟,吕世华,陈世强,等. 干旱区绿洲地表反照率不对称观测研究[J]. 中国科学院西北生态环境资源研究院,2009,30(7):953-956.
APA	文莉娟,吕世华,陈世强,孟宪红,李锁锁,&奥银焕.(2009).干旱区绿洲地表反照率不对称观测研究.,30(7),953-956.
MLA	文莉娟,et al."干旱区绿洲地表反照率不对称观测研究".30.7(2009):953-956.