Seasonal changes in isoprene emission and deposition in central Amazonia
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo de conferência |
Título da fonte: | Repositório Institucional do IPEN |
Texto Completo: | http://repositorio.ipen.br/handle/123456789/29201 |
Resumo: | Isoprene fluxes vary seasonally with changes in environmental factors as light and temperature, and biological factors as leaf phenology. But, our understanding of isoprene seasonal dependency to these factors is still limited in Amazonia. It has been indicated that the dry season shows higher emissions than the wet season, because there is more light available and higher temperature. Also, leaf phenology was recently suggested to drive ecosystem isoprene emissions, but local seasonal observations were scarce or not available. Here, we present canopy isoprene flux measured in two sites of primary rainforest in central Amazonia and compare to changes in light, temperature, and leaf phenology. The highest emissions were during the dry and dry-to-wet transition seasons, and the wet and the wet-to dry transition seasons revealed net deposition for one site. Leaf phenology, referred as changes in observed mature Leaf Area Index, was the most correlated factor and explained up to 59% of seasonal isoprene emissions. Attempting to represent this with modeling, the MEGAN 2.1 leaf age algorithm was driven by inputs resulted from a leaf demography64 ontogeny model that uses leaf flushing observed in the fields. However, model emissions were overestimated and did not capture the seasonal behavior observed. Using the leaf phenology from the field as inputs for the leaf age algorithm of MEGAN 2.1, improved estimates of the proportion of leaves in different leaf age categories for each site, but did not change the relative isoprene emission capacity used for each age class. This study hightlights the importance of accounting for differential isoprene emission capacity across canopy leaf age classes and of identifying the forest adaptive mechanisms that underly seasonal variation of emission, and potentially deposition, of isoprene in Amazonia. |
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2018-09-24T18:19:35Z2018-09-24T18:19:35ZSeptember 11-14, 2017http://repositorio.ipen.br/handle/123456789/29201Isoprene fluxes vary seasonally with changes in environmental factors as light and temperature, and biological factors as leaf phenology. But, our understanding of isoprene seasonal dependency to these factors is still limited in Amazonia. It has been indicated that the dry season shows higher emissions than the wet season, because there is more light available and higher temperature. Also, leaf phenology was recently suggested to drive ecosystem isoprene emissions, but local seasonal observations were scarce or not available. Here, we present canopy isoprene flux measured in two sites of primary rainforest in central Amazonia and compare to changes in light, temperature, and leaf phenology. The highest emissions were during the dry and dry-to-wet transition seasons, and the wet and the wet-to dry transition seasons revealed net deposition for one site. Leaf phenology, referred as changes in observed mature Leaf Area Index, was the most correlated factor and explained up to 59% of seasonal isoprene emissions. Attempting to represent this with modeling, the MEGAN 2.1 leaf age algorithm was driven by inputs resulted from a leaf demography64 ontogeny model that uses leaf flushing observed in the fields. However, model emissions were overestimated and did not capture the seasonal behavior observed. Using the leaf phenology from the field as inputs for the leaf age algorithm of MEGAN 2.1, improved estimates of the proportion of leaves in different leaf age categories for each site, but did not change the relative isoprene emission capacity used for each age class. This study hightlights the importance of accounting for differential isoprene emission capacity across canopy leaf age classes and of identifying the forest adaptive mechanisms that underly seasonal variation of emission, and potentially deposition, of isoprene in Amazonia.Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2018-09-24T18:19:35Z No. of bitstreams: 1 24950.pdf: 892614 bytes, checksum: 887541b12c90c4c120831bcacabab79c (MD5)Made available in DSpace on 2018-09-24T18:19:35Z (GMT). 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dc.title.pt_BR.fl_str_mv |
Seasonal changes in isoprene emission and deposition in central Amazonia |
title |
Seasonal changes in isoprene emission and deposition in central Amazonia |
spellingShingle |
Seasonal changes in isoprene emission and deposition in central Amazonia ALVES, ELIANE G. |
title_short |
Seasonal changes in isoprene emission and deposition in central Amazonia |
title_full |
Seasonal changes in isoprene emission and deposition in central Amazonia |
title_fullStr |
Seasonal changes in isoprene emission and deposition in central Amazonia |
title_full_unstemmed |
Seasonal changes in isoprene emission and deposition in central Amazonia |
title_sort |
Seasonal changes in isoprene emission and deposition in central Amazonia |
author |
ALVES, ELIANE G. |
author_facet |
ALVES, ELIANE G. TOTA, JULIO TURNIPSEED, ANDREW VEGA BUSTILLOS, JOSE O.W. SANTANA, RAONI A. LOPES, PAULA R.C. CIRINO, GLAUBER G. TAVARES, JULIA V. LOPES, ALINE NELSON, BRUCE ROSA, DIOGO VALE, DALTON SOUZA, RODRIGO de GU, DASA STAVRAKOU, TRISSEVGENI ADAMS, DAVID WU, JIN SALESKA, SCOTT DIAS-JUNIOR, CLEO YANEZ-SERRANO, ANA M. KESSELMEIER, JURGEN KARL, THOMAS MANZI, ANTONIO GUENTHER, ALEX ILEAPS SCIENCE CONFERENCE, 5th |
author_role |
author |
author2 |
TOTA, JULIO TURNIPSEED, ANDREW VEGA BUSTILLOS, JOSE O.W. SANTANA, RAONI A. LOPES, PAULA R.C. CIRINO, GLAUBER G. TAVARES, JULIA V. LOPES, ALINE NELSON, BRUCE ROSA, DIOGO VALE, DALTON SOUZA, RODRIGO de GU, DASA STAVRAKOU, TRISSEVGENI ADAMS, DAVID WU, JIN SALESKA, SCOTT DIAS-JUNIOR, CLEO YANEZ-SERRANO, ANA M. KESSELMEIER, JURGEN KARL, THOMAS MANZI, ANTONIO GUENTHER, ALEX ILEAPS SCIENCE CONFERENCE, 5th |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
ALVES, ELIANE G. TOTA, JULIO TURNIPSEED, ANDREW VEGA BUSTILLOS, JOSE O.W. SANTANA, RAONI A. LOPES, PAULA R.C. CIRINO, GLAUBER G. TAVARES, JULIA V. LOPES, ALINE NELSON, BRUCE ROSA, DIOGO VALE, DALTON SOUZA, RODRIGO de GU, DASA STAVRAKOU, TRISSEVGENI ADAMS, DAVID WU, JIN SALESKA, SCOTT DIAS-JUNIOR, CLEO YANEZ-SERRANO, ANA M. KESSELMEIER, JURGEN KARL, THOMAS MANZI, ANTONIO GUENTHER, ALEX ILEAPS SCIENCE CONFERENCE, 5th |
description |
Isoprene fluxes vary seasonally with changes in environmental factors as light and temperature, and biological factors as leaf phenology. But, our understanding of isoprene seasonal dependency to these factors is still limited in Amazonia. It has been indicated that the dry season shows higher emissions than the wet season, because there is more light available and higher temperature. Also, leaf phenology was recently suggested to drive ecosystem isoprene emissions, but local seasonal observations were scarce or not available. Here, we present canopy isoprene flux measured in two sites of primary rainforest in central Amazonia and compare to changes in light, temperature, and leaf phenology. The highest emissions were during the dry and dry-to-wet transition seasons, and the wet and the wet-to dry transition seasons revealed net deposition for one site. Leaf phenology, referred as changes in observed mature Leaf Area Index, was the most correlated factor and explained up to 59% of seasonal isoprene emissions. Attempting to represent this with modeling, the MEGAN 2.1 leaf age algorithm was driven by inputs resulted from a leaf demography64 ontogeny model that uses leaf flushing observed in the fields. However, model emissions were overestimated and did not capture the seasonal behavior observed. Using the leaf phenology from the field as inputs for the leaf age algorithm of MEGAN 2.1, improved estimates of the proportion of leaves in different leaf age categories for each site, but did not change the relative isoprene emission capacity used for each age class. This study hightlights the importance of accounting for differential isoprene emission capacity across canopy leaf age classes and of identifying the forest adaptive mechanisms that underly seasonal variation of emission, and potentially deposition, of isoprene in Amazonia. |
publishDate |
2018 |
dc.date.evento.pt_BR.fl_str_mv |
September 11-14, 2017 |
dc.date.accessioned.fl_str_mv |
2018-09-24T18:19:35Z |
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2018-09-24T18:19:35Z |
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