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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
04/12/2023 |
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Data da última atualização: |
04/12/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
RESTREPO-COUPE, N.; ALBERT, L. P.; LONGO, M.; BAKER, I.; LEVINE, N. M.; MERCADO, L. M.; ARAUJO, A. C. de; CHRISTOFFERSEN, B. O.; COSTA, M. H.; FITZJARRALD, D. R.; GALBRAITH, D.; IMBUZEIRO, H.; MALHI, Y.; RANDOW, C. von; ZENG, X.; MOORCROFT, P.; SALESKA, S. R. |
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Afiliação: |
NATALIA RESTREPO-COUPE, University of Arizona / University of Technology Sydney; LOREN P. ALBERT, University of Arizona / West Virginia University; MARCOS LONGO, Harvard University/California Institute of Technology; IAN BAKER, Colorado State University; NAOMI M. LEVINE, Harvard University / University of Southern California; LINA M. MERCADO, University of Exeter / Centre for Ecology and Hydrology; ALESSANDRO CARIOCA DE ARAUJO, CPATU; BRADLEY O'DONNELL CHRISTOFFERSEN, University of Texas Rio Grande Valley / Earth and Environmental Sciences Division, Los Alamos National Laboratory; MARCOS H. COSTA, UFV; DAVID R. FITZJARRALD, University at Albany SUNY; DAVID GALBRAITH, University of Leeds; HEWLLEY IMBUZEIRO, UFV; YADVINDER MALHI, University of Oxford; CELSO VON RANDOW, INPE; XUBIN ZENG, University of Arizona; PAUL MOORCROFT, California Institute of Technology; SCOTT R. SALESKA, University of Arizona. |
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Título: |
Understanding water and energy fluxes in the Amazonia: Lessons from an observation-model intercomparison. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Global Change Biology, v. 27, n. 9, p. 1802-1819, 2021. |
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DOI: |
https://doi.org/10.1111/gcb.15555 |
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Idioma: |
Inglês |
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Conteúdo: |
Tropical forests are an important part of global water and energy cycles, but the mechanisms that drive seasonality of their land-atmosphere exchanges have proven challenging to capture in models. Here, we (1) report the seasonality of fluxes of latent heat (LE), sensible heat (H), and outgoing short and longwave radiation at four diverse tropical forest sites across Amazonia-along the equator from the Caxiuanã and Tapajós National Forests in the eastern Amazon to a forest near Manaus, and from the equatorial zone to the southern forest in Reserva Jaru; (2) investigate how vegetation and climate influence these fluxes; and (3) evaluate land surface model performance by comparing simulations to observations. We found that previously identified failure of models to capture observed dry-season increases in evapotranspiration (ET) was associated with model overestimations of (1) magnitude and seasonality of Bowen ratios (relative to aseasonal observations in which sensible was only 20%-30% of the latent heat flux) indicating model exaggerated water limitation, (2) canopy emissivity and reflectance (albedo was only 10%-15% of incoming solar radiation, compared to 0.15%-0.22% simulated), and (3) vegetation temperatures (due to underestimation of dry-season ET and associated cooling). These partially compensating model-observation discrepancies (e.g., higher temperatures expected from excess Bowen ratios were partially ameliorated by brighter leaves and more interception/evaporation) significantly biased seasonal model estimates of net radiation (Rn), the key driver of water and energy fluxes (LE ~ 0.6 Rn and H ~ 0.15 Rn), though these biases varied among sites and models. A better representation of energy-related parameters associated with dynamic phenology (e.g., leaf optical properties, canopy interception, and skin temperature) could improve simulations and benchmarking of current vegetation-atmosphere exchange and reduce uncertainty of regional and global biogeochemical models. MenosTropical forests are an important part of global water and energy cycles, but the mechanisms that drive seasonality of their land-atmosphere exchanges have proven challenging to capture in models. Here, we (1) report the seasonality of fluxes of latent heat (LE), sensible heat (H), and outgoing short and longwave radiation at four diverse tropical forest sites across Amazonia-along the equator from the Caxiuanã and Tapajós National Forests in the eastern Amazon to a forest near Manaus, and from the equatorial zone to the southern forest in Reserva Jaru; (2) investigate how vegetation and climate influence these fluxes; and (3) evaluate land surface model performance by comparing simulations to observations. We found that previously identified failure of models to capture observed dry-season increases in evapotranspiration (ET) was associated with model overestimations of (1) magnitude and seasonality of Bowen ratios (relative to aseasonal observations in which sensible was only 20%-30% of the latent heat flux) indicating model exaggerated water limitation, (2) canopy emissivity and reflectance (albedo was only 10%-15% of incoming solar radiation, compared to 0.15%-0.22% simulated), and (3) vegetation temperatures (due to underestimation of dry-season ET and associated cooling). These partially compensating model-observation discrepancies (e.g., higher temperatures expected from excess Bowen ratios were partially ameliorated by brighter leaves and more interception/evaporatio... Mostrar Tudo |
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Thesagro: |
Balanço de Energia; Ecossistema; Floresta Tropical. |
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Thesaurus NAL: |
Amazonia; Ecosystems; Eddy covariance; Energy balance; Evapotranspiration; Tropical forests. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
|
Marc: |
LEADER 03241naa a2200433 a 4500
001 2159142
005 2023-12-04
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1111/gcb.15555$2DOI
100 1 $aRESTREPO-COUPE, N.
245 $aUnderstanding water and energy fluxes in the Amazonia$bLessons from an observation-model intercomparison.$h[electronic resource]
260 $c2021
520 $aTropical forests are an important part of global water and energy cycles, but the mechanisms that drive seasonality of their land-atmosphere exchanges have proven challenging to capture in models. Here, we (1) report the seasonality of fluxes of latent heat (LE), sensible heat (H), and outgoing short and longwave radiation at four diverse tropical forest sites across Amazonia-along the equator from the Caxiuanã and Tapajós National Forests in the eastern Amazon to a forest near Manaus, and from the equatorial zone to the southern forest in Reserva Jaru; (2) investigate how vegetation and climate influence these fluxes; and (3) evaluate land surface model performance by comparing simulations to observations. We found that previously identified failure of models to capture observed dry-season increases in evapotranspiration (ET) was associated with model overestimations of (1) magnitude and seasonality of Bowen ratios (relative to aseasonal observations in which sensible was only 20%-30% of the latent heat flux) indicating model exaggerated water limitation, (2) canopy emissivity and reflectance (albedo was only 10%-15% of incoming solar radiation, compared to 0.15%-0.22% simulated), and (3) vegetation temperatures (due to underestimation of dry-season ET and associated cooling). These partially compensating model-observation discrepancies (e.g., higher temperatures expected from excess Bowen ratios were partially ameliorated by brighter leaves and more interception/evaporation) significantly biased seasonal model estimates of net radiation (Rn), the key driver of water and energy fluxes (LE ~ 0.6 Rn and H ~ 0.15 Rn), though these biases varied among sites and models. A better representation of energy-related parameters associated with dynamic phenology (e.g., leaf optical properties, canopy interception, and skin temperature) could improve simulations and benchmarking of current vegetation-atmosphere exchange and reduce uncertainty of regional and global biogeochemical models.
650 $aAmazonia
650 $aEcosystems
650 $aEddy covariance
650 $aEnergy balance
650 $aEvapotranspiration
650 $aTropical forests
650 $aBalanço de Energia
650 $aEcossistema
650 $aFloresta Tropical
700 1 $aALBERT, L. P.
700 1 $aLONGO, M.
700 1 $aBAKER, I.
700 1 $aLEVINE, N. M.
700 1 $aMERCADO, L. M.
700 1 $aARAUJO, A. C. de
700 1 $aCHRISTOFFERSEN, B. O.
700 1 $aCOSTA, M. H.
700 1 $aFITZJARRALD, D. R.
700 1 $aGALBRAITH, D.
700 1 $aIMBUZEIRO, H.
700 1 $aMALHI, Y.
700 1 $aRANDOW, C. von
700 1 $aZENG, X.
700 1 $aMOORCROFT, P.
700 1 $aSALESKA, S. R.
773 $tGlobal Change Biology$gv. 27, n. 9, p. 1802-1819, 2021.
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