干旱区生态环境知识资源中心(Arid): Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method

Arid

	Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method
	Hua Ding; Hao Xingming; Zhang Ying; Qin Jingxiu
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2020
卷号	12 期号:1 页码:166-180
英文摘要	The Penman-Monteith (PM) method is the most widely used technique to estimate potential worldwide evapotranspiration. However, current research shows that there may be significant errors in the application of this method in arid areas, although questions remain as to the degree of this estimation error and how different surface conditions may affect the estimation error. To address these issues, we evaluated the uncertainty of the PM method under different underlying conditions in an arid area of Northwest China by analyzing data from 84 meteorological stations and various Moderate Resolution Imaging Spectroradiometer (MODIS) products, including land surface temperature and surface albedo. First, we found that when the PM method used air temperature to calculate the slope of the saturation vapor pressure curve, it significantly overestimated the potential evapotranspiration; the mean annual and July-August overestimation was 83.9 and 36.7 mm, respectively. Second, the PM method usually set the surface albedo to a fixed value, which led to the potential evapotranspiration being underestimated; the mean annual underestimation was 27.5 mm, while the overestimation for July to August was 5.3 mm. Third, the PM method significantly overestimated the potential evapotranspiration in the arid area. This difference in estimation was closely related to the underlying surface conditions. For the entire arid zone, the PM method overestimated the potential evapotranspiration by 33.7 mm per year, with an overestimation of 29.0 mm from July to August. The most significant overestimation was evident in the mountainous and plain nonvegetation areas, in which the annual mean overestimation reached 5% and 10%, respectively; during July, there was an estimation of 10% and 20%, respectively. Although the annual evapotranspiration of the plains with better vegetation coverage was slightly underestimated, overestimation still occurred in July and August, with a mean overestimation of approximately 5%. In order to estimate potential evapotranspiration in the arid zone, it is important that we identify a reasonable parameter with which to calibrate the PM formula, such as the slope of the saturation vapor pressure curve, and the surface albedo. We recommend that some parameters must be corrected when using PM in order to estimate potential evapotranspiration in arid regions.
英文关键词	Penman-Monteith parameter correction surface temperature albedo Northwest China
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6663128
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336256
作者单位	Hua Ding, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Desert and Oasis Ecology;;, Urumqi;;, ;;Beijing 830011;;100049.; Hao Xingming, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Desert and Oasis Ecology;;, Urumqi;;, ;;Beijing 830011;;100049.; Zhang Ying, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Desert and Oasis Ecology;;, Urumqi;;, ;;Beijing 830011;;100049.; Qin Jingxiu, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences;;University of Chinese Academy of Sciences, State Key Laboratory of Desert and Oasis Ecology;;, Urumqi;;, ;;Beijing 830011;;100049.
推荐引用方式 GB/T 7714	Hua Ding,Hao Xingming,Zhang Ying,et al. Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method[J],2020,12(1):166-180.
APA	Hua Ding,Hao Xingming,Zhang Ying,&Qin Jingxiu.(2020).Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method.Journal of Arid Land,12(1),166-180.
MLA	Hua Ding,et al."Uncertainty assessment of potential evapotranspiration in arid areas, as estimated by the Penman-Monteith method".Journal of Arid Land 12.1(2020):166-180.