QQ客服 官方微博 反馈留言

	Identification of dominant climate factor for pan evaporation trend in the Tibetan Plateau
	Liu X. M. ; Zheng H. X. ; Zhang M. H. ; Liu C. M.
	2011
关键词	pan evaporation trend reference evapotranspiration attribution the Tibetan Plateau yellow-river basin potential evapotranspiration united-states complementary relationship hydrologic-cycle
英文摘要	Despite the observed increase in global temperature, observed pan evaporation in many regions has been decreasing over the past 50 years, which is known as the "pan evaporation paradox". The "pan evaporation paradox" also exists in the Tibetan Plateau, where pan evaporation has decreased by 3.06 mm a(-2) (millimeter per annum). It is necessary to explain the mechanisms behind the observed decline in pan evaporation because the Tibetan Plateau strongly influences climatic and environmental changes in China, Asia and even in the Northern Hemisphere. In this paper, a derivation based approach has been used to quantitatively assess the contribution rate of climate factors to the observed pan evaporation trend across the Tibetan Plateau. The results showed that, provided the other factors remain constant, the increasing temperature should have led to a 2.73 mm a(-2) increase in pan evaporation annually, while change in wind speed, vapor pressure and solar radiation should have led to a decrease in pan evaporation by 2.81 mm a(-2), 1.96 mm a(-2) and 1.11 mm a(-2) respectively from 1970 to 2005. The combined effects of the four climate variables have resulted in a 3.15 mm a(-2) decrease in pan evaporation, which is close to the observed pan evaporation trend with a relative error of 2.94%. A decrease in wind speed was the dominant factor for the decreasing pan evaporation, followed by an increasing vapor pressure and decreasing solar radiation, all of which offset the effect of increasing temperature across the Tibetan Plateau.
出处	Journal of Geographical Sciences
卷	21
期	4
页	594-608
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23411]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liu X. M.,Zheng H. X.,Zhang M. H.,et al. Identification of dominant climate factor for pan evaporation trend in the Tibetan Plateau. 2011.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。