globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025975
论文题名:
Temporal upscaling of instantaneous evapotranspiration on clear-sky days using the constant reference evaporative fraction method with fixed or variable surface resistances at two cropland sites
作者: Tang R.; Li Z.-L.; Sun X.; Bi Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期:2
起始页码: 784
结束页码: 801
语种: 英语
英文关键词: evapotranspiration ; fixed or variable resistance ; reference evaporative fraction method ; temporal upscaling
Scopus关键词: alfalfa ; clear sky ; eddy covariance ; energy balance ; evapotranspiration ; grass ; ground-based measurement ; latent heat flux ; Penman-Monteith equation ; temporal variation ; upscaling ; China
英文摘要: Surface evapotranspiration (ET) is an important component of water and energy in land and atmospheric systems. This paper investigated whether using variable surface resistances in the reference ET estimates from the full-form Penman-Monteith (PM) equation could improve the upscaled daily ET estimates in the constant reference evaporative fraction (EFr, the ratio of actual to reference grass/alfalfa ET) method on clear-sky days using ground-based measurements. Half-hourly near-surface meteorological variables and eddy covariance (EC) system-measured latent heat flux data on clear-sky days were collected at two sites with different climatic conditions, namely, the subhumid Yucheng station in northern China and the arid Yingke site in northwestern China and were used as the model input and ground-truth, respectively. The results showed that using the Food and Agriculture Organization (FAO)-PM equation, the American Society of Civil Engineers-PM equation, and the full-form PM equation to estimate the reference ET in the constant EFr method produced progressively smaller upscaled daily ET at a given time from midmorning to midafternoon. Using all three PM equations produced the best results at noon at both sites regardless of whether the energy imbalance of the EC measurements was closed. When the EC measurements were not corrected for energy imbalance, using variable surface resistance in the full-form PM equation could improve the ET upscaling in the midafternoon, but worse results may occur in the midmorning to noon. Site-to-site and time-to-time variations were found in the performances of a given PM equation (with fixed or variable surface resistances) before and after the energy imbalance was closed. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: 41571351 ; 41571367
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62717
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, Beijing, China; Key Laboratory of Agri-informatics, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China; ICube, UdS, CNRS, Illkirch, France; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Beijing, China

Recommended Citation:
Tang R.,Li Z.-L.,Sun X.,et al. Temporal upscaling of instantaneous evapotranspiration on clear-sky days using the constant reference evaporative fraction method with fixed or variable surface resistances at two cropland sites[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)
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