气候变化领域集成服务门户(CCPortal): Increasing Tibetan Plateau terrestrial evapotranspiration primarily driven by precipitation

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DOI	10.1016/j.agrformet.2022.108887
	Increasing Tibetan Plateau terrestrial evapotranspiration primarily driven by precipitation
	Ma, Ning; Zhang, Yongqiang
发表日期	2022
ISSN	0168-1923
EISSN	1873-2240
卷号	317
英文摘要	While terrestrial evapotranspiration (ET) from the Tibetan Plateau (TP) plays a key role in modulating water storage change in the Asian Water Tower, the magnitude, trend, and drivers of ET remain poorly understood in this region due partially to sparse ground measurements. This study used a water-carbon coupled biophysical model, Penman-Monteith-Leuning Version 2 (PML_V2), to characterize the variations in ET across TP during 1982-2016 and its drivers. Model parameters of PML_V2 were calibrated against ground-observed data from 14 eddy-covariance flux towers. Plot- and basin-scale validations demonstrate that the PML_V2 is robust enough in simulating both magnitude and trend in ET. The 35-year mean annual ET rates decrease from the southeastern to the northwestern TP, leading to a TP-averaged value of 353 +/- 24 mm yr(-1). Soil evaporation is the main component (64%) of ET, followed by plant transpiration (31%) and canopy evaporation (5%). From 1982 to 2016, TP-averaged ET increased significantly with a rate of 1.87 +/- 0.25 mm yr(-2) (p < 0.001) due primarily to precipitation enhancement. Spatially, precipitation is the dominant driver that controls ET trend over most parts of TP except certain regions in the southeastern and eastern TP, where net radiation and temperature do so instead, respectively. This is because 68% of the TP area is dryland with the aridity index < 0.65. While LAI appears less important than climate factors over much of TP, its relative contribution to ET trend exceeds 20% in many parts of eastern TP, indicating that vegetation change played a nonnegligible role in regulating annual ET variations over certain regions where LAI varied substantially. Our results are of vital importance for facilitating the understanding of hydrological processes over the Asian Water Tower.
英文关键词	Terrestrial evapotranspiration; Trend; Driver; PML_V2; Tibetan Plateau
语种	英语
WOS研究方向	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000821897300004
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280686
作者单位	Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS
推荐引用方式 GB/T 7714	Ma, Ning,Zhang, Yongqiang. Increasing Tibetan Plateau terrestrial evapotranspiration primarily driven by precipitation[J],2022,317.
APA	Ma, Ning,&Zhang, Yongqiang.(2022).Increasing Tibetan Plateau terrestrial evapotranspiration primarily driven by precipitation.AGRICULTURAL AND FOREST METEOROLOGY,317.
MLA	Ma, Ning,et al."Increasing Tibetan Plateau terrestrial evapotranspiration primarily driven by precipitation".AGRICULTURAL AND FOREST METEOROLOGY 317(2022).