干旱区生态环境知识资源中心(Arid): Aggregation of area-averaged evapotranspiration over the Ejina Oasis based on a flux matrix and footprint analysis

Arid

DOI	10.1016/j.jhydrol.2019.05.011
	Aggregation of area-averaged evapotranspiration over the Ejina Oasis based on a flux matrix and footprint analysis
	Xu, Feinan 1,2; Wang, Weizhen 1; Wang, Jiemin 1; Huang, Chunlin 1; Qi, Yuan 1; Li, Yan3 ; Ren, Zhiguo 1
通讯作者	Wang, Weizhen
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2019
卷号	575 页码:17-30
英文摘要	The determination of area-averaged evapotranspiration (ET) over a heterogeneous land surface at the satellite pixel scale/model grid scale (10(3)-10(4) m) is crucial to the evaluation of the remote sensing ET products and development of the parameterization schemes of general hydro-meteorological models. The Heihe Watershed Allied Telemetry Experimental Research (HiWATER) flux matrix of multi-site eddy-covariance (EC) and large aperture scintillometers (LASs) provided an unprecedented opportunity to establish an aggregation scheme for determining area-averaged surface fluxes. Based on the HiWATER flux matrix datasets and high-resolution land-cover map, a new flux aggregation method was developed by using footprint analysis and multiple-linear regression. The area-averaged sensible heat fluxes aggregated from the multi-site EC flux measurements using the developed method were compared with the LAS measured fluxes. The results showed that the new method produced reasonable estimates of sensible heat flux with a mean absolute percentage error (MAPE) value of around 20-30%. The new aggregation method also significantly outperformed other methods being applied commonly, such as the rather simple area-weighted method. The daily ET of various land-cover types and the area-averaged ET over the key area of the Populus euphratica forest reserve in the Ejina Oasis were separately estimated using the established disaggregation and aggregation schemes of the new method. The area-averaged ET over this key area ranged between 1 and 5 mm d(-1) for the 68 days growing period in 2014. Results of this study can be used for the evaluation of relevant remote sensing models and land surface process models.
英文关键词	Evapotranspiration Multi-site EC flux measurements Aggregation Footprint analysis High-resolution land-cover map Ejina Oasis
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000488143000002
WOS关键词	LARGE-APERTURE SCINTILLOMETER ; HETEROGENEOUS LAND-SURFACE ; ENERGY-BALANCE CLOSURE ; SENSIBLE HEAT FLUXES ; HEIHE RIVER-BASIN ; EDDY-COVARIANCE ; POPULUS-EUPHRATICA ; WATER-VAPOR ; LATENT-HEAT ; SUBURBAN ENVIRONMENT
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217171
作者单位	1.Chinese Acad Sci, Key Lab Remote Sensing Gansu Prov, Heihe Remote Sensing Expt Res Stn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 3.Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Xu, Feinan,Wang, Weizhen,Wang, Jiemin,et al. Aggregation of area-averaged evapotranspiration over the Ejina Oasis based on a flux matrix and footprint analysis[J]. 南京信息工程大学,2019,575:17-30.
APA	Xu, Feinan.,Wang, Weizhen.,Wang, Jiemin.,Huang, Chunlin.,Qi, Yuan.,...&Ren, Zhiguo.(2019).Aggregation of area-averaged evapotranspiration over the Ejina Oasis based on a flux matrix and footprint analysis.JOURNAL OF HYDROLOGY,575,17-30.
MLA	Xu, Feinan,et al."Aggregation of area-averaged evapotranspiration over the Ejina Oasis based on a flux matrix and footprint analysis".JOURNAL OF HYDROLOGY 575(2019):17-30.