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DOI	10.1016/j.jhydrol.2023.130332
	High uncertainty of evapotranspiration products under extreme climatic conditions
	Qian, Long; Zhang, Zhitao; Wu, Lifeng; Fan, Shaoshuai; Yu, Xingjiao; Liu, Xiaogang; Ba, Yalan; Ma, Haijiao; Wang, Yicheng
通讯作者	Zhang, ZT ; Wu, LF
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	626
英文摘要	Terrestrial Evapotranspiration (ET) is an important process for understanding regional or global water, energy, and carbon cycles, and with the development of satellite observations and increased research investment, grid ET products covering a broad spatial extent are becoming more readily available. However, as global warming becomes a reality and extreme climate events occur worldwide, existing studies do not go far enough to verify that these grid products can still be used under extreme climate conditions. This study evaluates nine global ET products, including land surface reanalysis products (GLDAS_CLSM, GLDAS_NOAH, ERA5, and FLDAS), remote sensing (RS) products (GLEAM_v3.6b, MOD16A2, and PMLv2), and multi-source data fusion products (REA and Synthesized), using observations from 153 flux towers worldwide. The objective is to evaluate their performance in estimating ET under extreme climatic conditions (high temperature, high vapor pressure deficit (VPD), and drought). The results indicate that the estimation accuracy of all ET products is significantly reduced under extreme climatic conditions, showing high uncertainty, and this impact is most severe in the Americas (AM) region. Overall, multi-source data fusion products showed the best estimation performance and were less affected by extreme climatic conditions. Among the remote sensing modeling products, GLEAM_v3.6b showed the best performance, while MOD16A2 has the lowest estimation accuracy. Land surface reanalysis products were most affected by extreme conditions, with CLSM and NOAH showing similar performance and ERA5 having the largest errors (RMSE_ERA5 = 1.699 mm/d, MAE_ERA5 = 1.294 mm/d). The ET products show significant error fluctuations and overestimation (PBias > 0.5) in most of North America, and there is a decline in simulation accuracy in arid and semi-arid regions near 30N, with most ET products showing overestimation. The most significant errors were observed in cropland areas (CRO) and deciduous broadleaf forest areas (DBF), with significant overestimation in mixed forest areas (MF). The results of this study provide valuable insights for researchers in selecting ET products under extreme climatic conditions and encourage product developers to consider uncertainty under such conditions, thereby improving product accuracy.
英文关键词	Terrestrial evapotranspiration Evapotranspiration products Extreme climate Assessment Global
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001107661300001
WOS关键词	SURFACE SOLAR-RADIATION ; VAPOR-PRESSURE DEFICIT ; WACMOS-ET PROJECT ; GLOBAL EVAPOTRANSPIRATION ; LAND EVAPORATION ; WATER SECURITY ; SATELLITE ; FLUX ; REANALYSIS ; MACHINE
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397424
推荐引用方式 GB/T 7714	Qian, Long,Zhang, Zhitao,Wu, Lifeng,et al. High uncertainty of evapotranspiration products under extreme climatic conditions[J],2023,626.
APA	Qian, Long.,Zhang, Zhitao.,Wu, Lifeng.,Fan, Shaoshuai.,Yu, Xingjiao.,...&Wang, Yicheng.(2023).High uncertainty of evapotranspiration products under extreme climatic conditions.JOURNAL OF HYDROLOGY,626.
MLA	Qian, Long,et al."High uncertainty of evapotranspiration products under extreme climatic conditions".JOURNAL OF HYDROLOGY 626(2023).