气候变化领域集成服务门户(CCPortal): A modified MOD16 algorithm to estimate evapotranspiration over alpine meadow on the Tibetan Plateau, China

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DOI	10.1016/j.jhydrol.2018.03.054
	A modified MOD16 algorithm to estimate evapotranspiration over alpine meadow on the Tibetan Plateau, China
	Chang, Yaping; Qin, Dahe; Ding, Yongjian; Zhao, Qiudong; Zhang, Shiqiang
发表日期	2018
ISSN	0022-1694
起始页码	16
结束页码	30
卷号	561
英文摘要	The long-term change of evapotranspiration (ET) is crucial for managing water resources in areas with extreme climates, such as the Tibetan Plateau (TP). This study proposed a modified algorithm for estimating ET based on the MOD16 algorithm on a global scale over alpine meadow on the TP in China. Wind speed and vegetation height were integrated to estimate aerodynamic resistance, while the temperature and moisture constraints for stomatal conductance were revised based on the technique proposed by Fisher et al, (2008). Moreover, Fisher's method for soil evaporation was adopted to reduce the uncertainty in soil evaporation estimation. Five representative alpine meadow sites on the TP were selected to investigate the performance of the modified algorithm. Comparisons were made between the ET observed using the Eddy Covariance (EC) and estimated using both the original and modified algorithms. The results revealed that the modified algorithm performed better than the original MOD16 algorithm with the coefficient of determination (R-2) increasing from 0.26 to 0.68, and root mean square error (RMSE) decreasing from 1.56 to 0.78 mm d(-1). The modified algorithm performed slightly better with a higher R-2 (0.70) and lower RMSE (0.61 mm d(-1)) for after-precipitation days than for non precipitation days at Suli site. Contrarily, better results were obtained for non-precipitation days than for after precipitation days at Arou, Tanggula, and Hulugou sites, indicating that the modified algorithm may be more suitable for estimating ET for non-precipitation days with higher accuracy than for after-precipitation days, which had large observation errors. The comparisons between the modified algorithm and two mainstream methods suggested that the modified algorithm could produce high accuracy ET over the alpine meadow sites on the TP.
英文关键词	Evapotranspiration; Alpine meadow; Modified MOD16 algorithm; Resistance parameterization; Tibetan Plateau
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
来源期刊	JOURNAL OF HYDROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158522
作者单位	Ding, YJ (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China.; Zhang, SQ (corresponding author), Northwest Univ, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian 710127, Shaanxi, Peoples R China.
推荐引用方式 GB/T 7714	Chang, Yaping,Qin, Dahe,Ding, Yongjian,et al. A modified MOD16 algorithm to estimate evapotranspiration over alpine meadow on the Tibetan Plateau, China[J],2018,561.
APA	Chang, Yaping,Qin, Dahe,Ding, Yongjian,Zhao, Qiudong,&Zhang, Shiqiang.(2018).A modified MOD16 algorithm to estimate evapotranspiration over alpine meadow on the Tibetan Plateau, China.JOURNAL OF HYDROLOGY,561.
MLA	Chang, Yaping,et al."A modified MOD16 algorithm to estimate evapotranspiration over alpine meadow on the Tibetan Plateau, China".JOURNAL OF HYDROLOGY 561(2018).