Simulations of tropical rainforest albedo: is canopy wetness important?

Accurate information on surface albedo is essential for climate modelling, especially for regions such as Amazonia, where the response of the regional atmospheric circulation to the changes on surface albedo is strong. Previous studies have indicated that models are still unable to correctly reprodu...

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Detalles Bibliográficos
Autores: Yanagi, Silvia N.M., Costa, Marcos H.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Brasil
Institución:Universidade Federal de Viçosa (UFV)
Repositorio:LOCUS Repositório Institucional da UFV
Idioma:inglés
OAI Identifier:oai:locus.ufv.br:123456789/17931
Acceso en línea:http://dx.doi.org/10.1590/S0001-37652011005000047
http://www.locus.ufv.br/handle/123456789/17931
Access Level:acceso abierto
Palabra clave:Canopy etness
Diurnal albedo
Tropical forest and simulation
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spelling Simulations of tropical rainforest albedo: is canopy wetness important?Canopy etnessDiurnal albedoTropical forest and simulationAccurate information on surface albedo is essential for climate modelling, especially for regions such as Amazonia, where the response of the regional atmospheric circulation to the changes on surface albedo is strong. Previous studies have indicated that models are still unable to correctly reproduce details of the seasonal variation of surface albedo. Therefore, it was investigated the role of canopy wetness on the simulated albedo of a tropical rainforest by modifying the IBIS canopy radiation transfer code to incorporate the effects of canopy wetness on the vegetation reflectance. In this study, simulations were run using three versions of the land surface/ecosystem model IBIS: the standard version, the same version recalibrated to fit the data of albedo on tropical rainforests and a modified version that incorporates the effects of canopy wetness on surface albedo, for three sites in the Amazon forest at hourly and monthly scales. The results demonstrated that, at the hourly time scale, the incorporation of canopy wetness on the calculations of radiative transfer substantially improves the simulations results, whereas at the monthly scale these changes do not substantially modify the simulated albedo.A informação precisa do albedo superficial é essencial para a modelagem climática, especialmente para regiões, tais como a Amazônia, onde a resposta da circulação atmosférica regional às mudanças do albedo superficial é forte. Estudos preliminares têm indicado que os modelos ainda não são capazes de reproduzir corretamente os detalhes da variação sazonal do albedo superficial. Portanto, investigou-se o papel do molhamento foliar sobre o albedo simulado de uma floresta tropical por meio da modificação do código de transferência radiativa no dossel do IBIS para incorporar os efeitos do molhamento do dossel sobre a refletância da vegetação. Neste estudo, procederamse simulações usando três versões do modelo superfície terrestre/ ecossistema IBIS: a versão padrão, a mesma versão recalibrada para ajustar aos dados de albedo de florestas tropicais e, uma versão modificada que incorpora os efeitos do molhamento do dossel sobre o albedo superficial, para três sítios da floresta amazônica em escalas horária e mensal. Os resultados demonstraram que, em escala horária, a incorporação do molhamento do dossel sobre os cálculos de transferência radiativa melhora substancialmente os resultados simulados, enquanto que, em escala mensal, essas mudanças não modificam substancialmente o albedo simulado.Anais da Academia Brasileira de Ciências2018-02-26T16:53:03Z2018-02-26T16:53:03Z2011-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlepdfapplication/pdf00013765http://dx.doi.org/10.1590/S0001-37652011005000047http://www.locus.ufv.br/handle/123456789/17931engv. 83, n. 4, p. 1171-1180, Oct 2011info:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFVYanagi, Silvia N.M.Costa, Marcos H.2024-07-12T06:30:43Zoai:locus.ufv.br:123456789/17931Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452024-07-12T06:30:43LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.none.fl_str_mv Simulations of tropical rainforest albedo: is canopy wetness important?
title Simulations of tropical rainforest albedo: is canopy wetness important?
spellingShingle Simulations of tropical rainforest albedo: is canopy wetness important?
Yanagi, Silvia N.M.
Canopy etness
Diurnal albedo
Tropical forest and simulation
title_short Simulations of tropical rainforest albedo: is canopy wetness important?
title_full Simulations of tropical rainforest albedo: is canopy wetness important?
title_fullStr Simulations of tropical rainforest albedo: is canopy wetness important?
title_full_unstemmed Simulations of tropical rainforest albedo: is canopy wetness important?
title_sort Simulations of tropical rainforest albedo: is canopy wetness important?
dc.creator.none.fl_str_mv Yanagi, Silvia N.M.
Costa, Marcos H.
author Yanagi, Silvia N.M.
author_facet Yanagi, Silvia N.M.
Costa, Marcos H.
author_role author
author2 Costa, Marcos H.
author2_role author
dc.subject.por.fl_str_mv Canopy etness
Diurnal albedo
Tropical forest and simulation
topic Canopy etness
Diurnal albedo
Tropical forest and simulation
description Accurate information on surface albedo is essential for climate modelling, especially for regions such as Amazonia, where the response of the regional atmospheric circulation to the changes on surface albedo is strong. Previous studies have indicated that models are still unable to correctly reproduce details of the seasonal variation of surface albedo. Therefore, it was investigated the role of canopy wetness on the simulated albedo of a tropical rainforest by modifying the IBIS canopy radiation transfer code to incorporate the effects of canopy wetness on the vegetation reflectance. In this study, simulations were run using three versions of the land surface/ecosystem model IBIS: the standard version, the same version recalibrated to fit the data of albedo on tropical rainforests and a modified version that incorporates the effects of canopy wetness on surface albedo, for three sites in the Amazon forest at hourly and monthly scales. The results demonstrated that, at the hourly time scale, the incorporation of canopy wetness on the calculations of radiative transfer substantially improves the simulations results, whereas at the monthly scale these changes do not substantially modify the simulated albedo.
publishDate 2011
dc.date.none.fl_str_mv 2011-03-01
2018-02-26T16:53:03Z
2018-02-26T16:53:03Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv 00013765
http://dx.doi.org/10.1590/S0001-37652011005000047
http://www.locus.ufv.br/handle/123456789/17931
identifier_str_mv 00013765
url http://dx.doi.org/10.1590/S0001-37652011005000047
http://www.locus.ufv.br/handle/123456789/17931
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv v. 83, n. 4, p. 1171-1180, Oct 2011
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Anais da Academia Brasileira de Ciências
publisher.none.fl_str_mv Anais da Academia Brasileira de Ciências
dc.source.none.fl_str_mv reponame:LOCUS Repositório Institucional da UFV
instname:Universidade Federal de Viçosa (UFV)
instacron:UFV
instname_str Universidade Federal de Viçosa (UFV)
instacron_str UFV
institution UFV
reponame_str LOCUS Repositório Institucional da UFV
collection LOCUS Repositório Institucional da UFV
repository.name.fl_str_mv LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)
repository.mail.fl_str_mv fabiojreis@ufv.br
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