Surface conductance for evapotranspiration of tropical forests: Calculations, variations, and controls

Tan, ZH; Zhao, JF; Wang, GZ; Chen, MP; Yang, LY; He, CS; Restrepo-Coupe, N; Peng, SS; Liu, XY; da Rocha, HR; Kosugi, Y; Hirano, T; Saleska, SR; Goulden, ML; Zeng, J; Ding, FJ; Gao, F; Song, L

Surface conductance for evapotranspiration of tropical forests: Calculations, variations, and controls

Tan, ZH Zhao, JF Wang, GZ Chen, MP Yang, LY He, CS Restrepo-Coupe, N

Peng, SS Liu, XY da Rocha, HR Kosugi, Y Hirano, T Saleska, SR Goulden, ML Zeng, J Ding, FJ Gao, F Song, L

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Publication Type:: Journal Article
Citation:: Agricultural and Forest Meteorology, 2019, 275 pp. 317 - 328
Issue Date:: 2019-09-15

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Field	Value	Language
dc.contributor.author	Tan, ZH	en_US
dc.contributor.author	Zhao, JF	en_US
dc.contributor.author	Wang, GZ	en_US
dc.contributor.author	Chen, MP	en_US
dc.contributor.author	Yang, LY	en_US
dc.contributor.author	He, CS	en_US
dc.contributor.author	Restrepo-Coupe, N https://orcid.org/0000-0003-3921-1772	en_US
dc.contributor.author	Peng, SS	en_US
dc.contributor.author	Liu, XY	en_US
dc.contributor.author	da Rocha, HR	en_US
dc.contributor.author	Kosugi, Y	en_US
dc.contributor.author	Hirano, T	en_US
dc.contributor.author	Saleska, SR	en_US
dc.contributor.author	Goulden, ML	en_US
dc.contributor.author	Zeng, J	en_US
dc.contributor.author	Ding, FJ	en_US
dc.contributor.author	Gao, F	en_US
dc.contributor.author	Song, L	en_US
dc.date.issued	2019-09-15	en_US
dc.identifier.citation	Agricultural and Forest Meteorology, 2019, 275 pp. 317 - 328	en_US
dc.identifier.issn	0168-1923	en_US
dc.identifier.uri	http://hdl.handle.net/10453/136532
dc.description.abstract	© 2019 Elsevier B.V. Tropical forests are responsible for the evaporation and transpiration of large quantities of water into the atmosphere annually. Surface conductance (gs) is a poorly understood phenomenon that plays a central role in regulating this evapotranspiration. We studied the calculations, variations, and environmental factors controlling gs based on eddy flux measurements from 10 tropical forest sites that covered a wide range of water gradients across continents. We found that boundary layer conductance (gb) is comparable with aerodynamic conductance for momentum (gaM) and thus, it should not be ignored in estimations of total aerodynamic conductance for water vapor (gaV). Based on the findings, we have made some recommendations for gaM estimation both with and without measurements of turbulence. The seasonal variation of gs is low in humid sites but large in sites with a dry season. A value of 24.8 ± 13.8 mm s−1 was suggested for maximum surface conductance (gsmax) for tropical forests. Both water vapor deficit (D) and radiation (Q) play an important role in controlling gs. The model driven by both D and Q could capture the diurnal variations of gs well and could be implemented in large-scale models in future. We believe the findings of this study could contribute substantially to our understanding of tropical forest gs.	en_US
dc.relation.ispartof	Agricultural and Forest Meteorology	en_US
dc.relation.isbasedon	10.1016/j.agrformet.2019.06.006	en_US
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.title	Surface conductance for evapotranspiration of tropical forests: Calculations, variations, and controls	en_US
dc.type	Journal Article
utslib.citation.volume	275	en_US
utslib.for	0705 Forestry Sciences	en_US
utslib.for	0401 Atmospheric Sciences	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	275	en_US

Abstract:

© 2019 Elsevier B.V. Tropical forests are responsible for the evaporation and transpiration of large quantities of water into the atmosphere annually. Surface conductance (gs) is a poorly understood phenomenon that plays a central role in regulating this evapotranspiration. We studied the calculations, variations, and environmental factors controlling gs based on eddy flux measurements from 10 tropical forest sites that covered a wide range of water gradients across continents. We found that boundary layer conductance (gb) is comparable with aerodynamic conductance for momentum (gaM) and thus, it should not be ignored in estimations of total aerodynamic conductance for water vapor (gaV). Based on the findings, we have made some recommendations for gaM estimation both with and without measurements of turbulence. The seasonal variation of gs is low in humid sites but large in sites with a dry season. A value of 24.8 ± 13.8 mm s−1 was suggested for maximum surface conductance (gsmax) for tropical forests. Both water vapor deficit (D) and radiation (Q) play an important role in controlling gs. The model driven by both D and Q could capture the diurnal variations of gs well and could be implemented in large-scale models in future. We believe the findings of this study could contribute substantially to our understanding of tropical forest gs.

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http://hdl.handle.net/10453/136532