globalchange  > 气候减缓与适应
DOI: 10.1002/2017JG003978
Scopus记录号: 2-s2.0-85041059251
论文题名:
Comparison of Big-Leaf, Two-Big-Leaf, and Two-Leaf Upscaling Schemes for Evapotranspiration Estimation Using Coupled Carbon-Water Modeling
作者: Luo X.; Chen J.M.; Liu J.; Black T.A.; Croft H.; Staebler R.; He L.; Arain M.A.; Chen B.; Mo G.; Gonsamo A.; McCaughey H.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:1
起始页码: 207
结束页码: 225
语种: 英语
英文关键词: big-leaf ; canopy stomatal conductance ; evapotranspiration ; gross primary productivity ; Penman-Monteith equation ; two-leaf
Scopus关键词: canopy ; carbon dioxide ; comparative study ; eddy covariance ; estimation method ; evapotranspiration ; flux measurement ; leaf area index ; modeling ; Penman-Monteith equation ; primary production ; stomatal conductance ; upscaling ; water flux ; Canada
英文摘要: Evapotranspiration (ET) is commonly estimated using the Penman-Monteith equation, which assumes that the plant canopy is a big leaf (BL) and the water flux from vegetation is regulated by canopy stomatal conductance (Gs). However, BL has been found to be unsuitable for terrestrial biosphere models built on the carbon-water coupling principle because it fails to capture daily variations of gross primary productivity (GPP). A two-big-leaf scheme (TBL) and a two-leaf scheme (TL) that stratify a canopy into sunlit and shaded leaves have been developed to address this issue. However, there is a lack of comparison of these upscaling schemes for ET estimation, especially on the difference between TBL and TL. We find that TL shows strong performance (r2 = 0.71, root-mean-square error = 0.05 mm/h) in estimating ET at nine eddy covariance towers in Canada. BL simulates lower annual ET and GPP than TL and TBL. The biases of estimated ET and GPP increase with leaf area index (LAI) in BL and TBL, and the biases of TL show no trends with LAI. BL miscalculates the portions of light-saturated and light-unsaturated leaves in the canopy, incurring negative biases in its flux estimation. TBL and TL showed improved yet different GPP and ET estimations. This difference is attributed to the lower Gs and intercellular CO2 concentration simulated in TBL compared to their counterparts in TL. We suggest to use TL for ET modeling to avoid the uncertainty propagated from the artificial upscaling of leaf-level processes to the canopy scale in BL and TBL. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114745
Appears in Collections:气候减缓与适应

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作者单位: Department of Geography and Planning, University of Toronto, Toronto, ON, Canada; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; School of Atmospheric Sciences, Nanjing University, Nanjing, China; Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, Canada; Air Quality Processes Research Section, Environment Canada, Toronto, ON, Canada; School of Geography and Earth Sciences and McMaster Centre for Climate Change, McMaster University, Hamilton, ON, Canada; International Institute for Earth System Science, Nanjing University, Nanjing, China; Department of Geography, Queen's University, Kingston, ON, Canada

Recommended Citation:
Luo X.,Chen J.M.,Liu J.,et al. Comparison of Big-Leaf, Two-Big-Leaf, and Two-Leaf Upscaling Schemes for Evapotranspiration Estimation Using Coupled Carbon-Water Modeling[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)
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