The land-atmosphere water flux in the tropics
Tropical vegetation is a major source of global land surface evapotranspiration, and can thus play a major role in global hydrological cycles and global atmospheric circulation. Accurate prediction of tropical evapotranspiration is critical to our understanding of these processes under changing clim...
| Autor principal: | Fisher, Joshua B. |
|---|---|
| Outros Autores: | Malhi, Yadvinder Singh, Bonal, Damien, Rocha, Humberto Ribeiro da, Araüjo, Alessandro Carioca de, Gamo, Minoru, Goulden, Michael L., Hirano, Takashi, Huete, Alfredo Ramon, Kondo, Hiroaki, Kumagai, Tomo'omi, Loescher, Henry W., Miller, Scott Dennis, Nobre, Antônio Donato, Nouvellon, Yann, Oberbauer, Steven F., Panuthai, Samreong, Roupsard, Olivier, Saleska, Scott Reid, Tanaka, Katsunori, Tanaka, Nobuaki, Tu, Kevin P., Von Randow, Celso |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Global Change Biology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18400 |
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oai:repositorio:1-18400 |
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oai:repositorio:1-18400 The land-atmosphere water flux in the tropics Fisher, Joshua B. Malhi, Yadvinder Singh Bonal, Damien Rocha, Humberto Ribeiro da Araüjo, Alessandro Carioca de Gamo, Minoru Goulden, Michael L. Hirano, Takashi Huete, Alfredo Ramon Kondo, Hiroaki Kumagai, Tomo'omi Loescher, Henry W. Miller, Scott Dennis Nobre, Antônio Donato Nouvellon, Yann Oberbauer, Steven F. Panuthai, Samreong Roupsard, Olivier Saleska, Scott Reid Tanaka, Katsunori Tanaka, Nobuaki Tu, Kevin P. Von Randow, Celso Atmospheric Circulation Climate Change Eddy Covariance Energy Balance Evapotranspiration Modeling Remote Sensing Tropical Environment Vegetation Index Amazonia Tropical vegetation is a major source of global land surface evapotranspiration, and can thus play a major role in global hydrological cycles and global atmospheric circulation. Accurate prediction of tropical evapotranspiration is critical to our understanding of these processes under changing climate. We examined the controls on evapotranspiration in tropical vegetation at 21 pan-tropical eddy covariance sites, conducted a comprehensive and systematic evaluation of 13 evapotranspiration models at these sites, and assessed the ability to scale up model estimates of evapotranspiration for the test region of Amazonia. Net radiation was the strongest determinant of evapotranspiration (mean evaporative fraction was 0.72) and explained 87% of the variance in monthly evapotranspiration across the sites. Vapor pressure deficit was the strongest residual predictor (14%), followed by normalized difference vegetation index (9%), precipitation (6%) and wind speed (4%). The radiation-based evapotranspiration models performed best overall for three reasons: (1) the vegetation was largely decoupled from atmospheric turbulent transfer (calculated from Ω decoupling factor), especially at the wetter sites; (2) the resistance-based models were hindered by difficulty in consistently characterizing canopy (and stomatal) resistance in the highly diverse vegetation; (3) the temperature-based models inadequately captured the variability in tropical evapotranspiration. We evaluated the potential to predict regional evapotranspiration for one test region: Amazonia. We estimated an Amazonia-wide evapotranspiration of 1370mmyr-1, but this value is dependent on assumptions about energy balance closure for the tropical eddy covariance sites; a lower value (1096mmyr-1) is considered in discussion on the use of flux data to validate and interpolate models. © 2009 The Authors Journal compilation © 2009 Blackwell Publishing Ltd. 2020-06-15T21:54:31Z 2020-06-15T21:54:31Z 2009 Artigo https://repositorio.inpa.gov.br/handle/1/18400 10.1111/j.1365-2486.2008.01813.x en Volume 15, Número 11, Pags. 2694-2714 Restrito Global Change Biology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Atmospheric Circulation Climate Change Eddy Covariance Energy Balance Evapotranspiration Modeling Remote Sensing Tropical Environment Vegetation Index Amazonia |
| spellingShingle |
Atmospheric Circulation Climate Change Eddy Covariance Energy Balance Evapotranspiration Modeling Remote Sensing Tropical Environment Vegetation Index Amazonia Fisher, Joshua B. The land-atmosphere water flux in the tropics |
| topic_facet |
Atmospheric Circulation Climate Change Eddy Covariance Energy Balance Evapotranspiration Modeling Remote Sensing Tropical Environment Vegetation Index Amazonia |
| description |
Tropical vegetation is a major source of global land surface evapotranspiration, and can thus play a major role in global hydrological cycles and global atmospheric circulation. Accurate prediction of tropical evapotranspiration is critical to our understanding of these processes under changing climate. We examined the controls on evapotranspiration in tropical vegetation at 21 pan-tropical eddy covariance sites, conducted a comprehensive and systematic evaluation of 13 evapotranspiration models at these sites, and assessed the ability to scale up model estimates of evapotranspiration for the test region of Amazonia. Net radiation was the strongest determinant of evapotranspiration (mean evaporative fraction was 0.72) and explained 87% of the variance in monthly evapotranspiration across the sites. Vapor pressure deficit was the strongest residual predictor (14%), followed by normalized difference vegetation index (9%), precipitation (6%) and wind speed (4%). The radiation-based evapotranspiration models performed best overall for three reasons: (1) the vegetation was largely decoupled from atmospheric turbulent transfer (calculated from Ω decoupling factor), especially at the wetter sites; (2) the resistance-based models were hindered by difficulty in consistently characterizing canopy (and stomatal) resistance in the highly diverse vegetation; (3) the temperature-based models inadequately captured the variability in tropical evapotranspiration. We evaluated the potential to predict regional evapotranspiration for one test region: Amazonia. We estimated an Amazonia-wide evapotranspiration of 1370mmyr-1, but this value is dependent on assumptions about energy balance closure for the tropical eddy covariance sites; a lower value (1096mmyr-1) is considered in discussion on the use of flux data to validate and interpolate models. © 2009 The Authors Journal compilation © 2009 Blackwell Publishing Ltd. |
| format |
Artigo |
| author |
Fisher, Joshua B. |
| author2 |
Malhi, Yadvinder Singh Bonal, Damien Rocha, Humberto Ribeiro da Araüjo, Alessandro Carioca de Gamo, Minoru Goulden, Michael L. Hirano, Takashi Huete, Alfredo Ramon Kondo, Hiroaki Kumagai, Tomo'omi Loescher, Henry W. Miller, Scott Dennis Nobre, Antônio Donato Nouvellon, Yann Oberbauer, Steven F. Panuthai, Samreong Roupsard, Olivier Saleska, Scott Reid Tanaka, Katsunori Tanaka, Nobuaki Tu, Kevin P. Von Randow, Celso |
| author2Str |
Malhi, Yadvinder Singh Bonal, Damien Rocha, Humberto Ribeiro da Araüjo, Alessandro Carioca de Gamo, Minoru Goulden, Michael L. Hirano, Takashi Huete, Alfredo Ramon Kondo, Hiroaki Kumagai, Tomo'omi Loescher, Henry W. Miller, Scott Dennis Nobre, Antônio Donato Nouvellon, Yann Oberbauer, Steven F. Panuthai, Samreong Roupsard, Olivier Saleska, Scott Reid Tanaka, Katsunori Tanaka, Nobuaki Tu, Kevin P. Von Randow, Celso |
| title |
The land-atmosphere water flux in the tropics |
| title_short |
The land-atmosphere water flux in the tropics |
| title_full |
The land-atmosphere water flux in the tropics |
| title_fullStr |
The land-atmosphere water flux in the tropics |
| title_full_unstemmed |
The land-atmosphere water flux in the tropics |
| title_sort |
land-atmosphere water flux in the tropics |
| publisher |
Global Change Biology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18400 |
| _version_ |
1787144354623651840 |
| score |
11.755432 |