Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia
<p>Isoprene fluxes vary seasonally with changes in environmental factors (e.g., solar radiation and temperature) and biological factors (e.g., leaf phenology). However, our understanding of the seasonal patterns of isoprene fluxes and the associated mechanistic controls is still limited, es...
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Format: | Article |
Language: | English |
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Copernicus Publications
2018-07-01
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Series: | Biogeosciences |
Online Access: | https://www.biogeosciences.net/15/4019/2018/bg-15-4019-2018.pdf |
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doaj-f9dafc79ef1443d79319af2cd379d3a9 |
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record_format |
Article |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
E. G. Alves J. Tóta A. Turnipseed A. B. Guenther J. O. W. Vega Bustillos R. A. Santana G. G. Cirino J. V. Tavares A. P. Lopes B. W. Nelson R. A. de Souza D. Gu T. Stavrakou D. K. Adams J. Wu S. Saleska A. O. Manzi |
spellingShingle |
E. G. Alves J. Tóta A. Turnipseed A. B. Guenther J. O. W. Vega Bustillos R. A. Santana G. G. Cirino J. V. Tavares A. P. Lopes B. W. Nelson R. A. de Souza D. Gu T. Stavrakou D. K. Adams J. Wu S. Saleska A. O. Manzi Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia Biogeosciences |
author_facet |
E. G. Alves J. Tóta A. Turnipseed A. B. Guenther J. O. W. Vega Bustillos R. A. Santana G. G. Cirino J. V. Tavares A. P. Lopes B. W. Nelson R. A. de Souza D. Gu T. Stavrakou D. K. Adams J. Wu S. Saleska A. O. Manzi |
author_sort |
E. G. Alves |
title |
Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia |
title_short |
Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia |
title_full |
Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia |
title_fullStr |
Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia |
title_full_unstemmed |
Leaf phenology as one important driver of seasonal changes in isoprene emissions in central Amazonia |
title_sort |
leaf phenology as one important driver of seasonal changes in isoprene emissions in central amazonia |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2018-07-01 |
description |
<p>Isoprene fluxes vary seasonally with changes in environmental factors (e.g.,
solar radiation and temperature) and biological factors (e.g., leaf
phenology). However, our understanding of the seasonal patterns of isoprene
fluxes and the associated mechanistic controls is still limited, especially in
Amazonian evergreen forests. In this paper, we aim to connect intensive,
field-based measurements of canopy isoprene flux over a central Amazonian
evergreen forest site with meteorological observations and with tower-mounted camera leaf phenology to improve our understanding of patterns and causes
of isoprene flux seasonality. Our results demonstrate that the highest
isoprene emissions are observed during the dry and dry-to-wet transition
seasons, whereas the lowest emissions were found during the wet-to-dry
transition season. Our results also indicate that light and temperature cannot totally explain isoprene flux seasonality. Instead, the camera-derived
leaf area index (LAI) of recently mature leaf age class (e.g., leaf ages of
3–5 months) exhibits the highest correlation with observed isoprene flux
seasonality (<i>R</i><sup>2</sup> = 0.59, <i>p</i> < 0.05). Attempting to better represent
leaf phenology in the Model of Emissions of Gases and Aerosols from Nature
(MEGAN 2.1), we improved the leaf age algorithm by utilizing results from the
camera-derived leaf phenology that provided LAI categorized into three
different leaf ages. The model results show that the observations of
age-dependent isoprene emission capacity, in conjunction with camera-derived
leaf age demography, significantly improved simulations in terms of seasonal
variations in isoprene fluxes (<i>R</i><sup>2</sup> = 0.52, <i>p</i> < 0.05). This study
highlights the importance of accounting for differences in isoprene emission
capacity across canopy leaf age classes and identifying forest adaptive
mechanisms that underlie seasonal variation in isoprene emissions in
Amazonia.</p> |
url |
https://www.biogeosciences.net/15/4019/2018/bg-15-4019-2018.pdf |
work_keys_str_mv |
AT egalves leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT jtota leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT aturnipseed leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT abguenther leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT jowvegabustillos leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT rasantana leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT ggcirino leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT jvtavares leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT aplopes leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT bwnelson leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT radesouza leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT dgu leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT tstavrakou leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT dkadams leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT jwu leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT ssaleska leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia AT aomanzi leafphenologyasoneimportantdriverofseasonalchangesinisopreneemissionsincentralamazonia |
_version_ |
1716824888865456128 |
spelling |
doaj-f9dafc79ef1443d79319af2cd379d3a92020-11-24T20:41:30ZengCopernicus PublicationsBiogeosciences1726-41701726-41892018-07-01154019403210.5194/bg-15-4019-2018Leaf phenology as one important driver of seasonal changes in isoprene emissions in central AmazoniaE. G. Alves0J. Tóta1A. Turnipseed2A. B. Guenther3J. O. W. Vega Bustillos4R. A. Santana5G. G. Cirino6J. V. Tavares7A. P. Lopes8B. W. Nelson9R. A. de Souza10D. Gu11T. Stavrakou12D. K. Adams13J. Wu14S. Saleska15A. O. Manzi16Department of Environmental Dynamics, National Institute for Amazonian Research (INPA), Av. André Araújo 2936, CEP 69067-375, Manaus-AM, BrazilInstitute of Engineering and Geoscience, Federal University of West Para (UFOPA), Rua Vera Paz s/n, CEP 68035-110, Santarem-PA, Brazil2B Technologies, Inc., 2100 Central Ave., Boulder, CO 80301, USADepartment of Earth System Science, University of California, Irvine, CA 92697, USAChemistry and Environment Center, National Institute for Energy and Nuclear Research (IPEN), Av. Lineu Prestes 2242, CEP 05508-000, São Paulo-SP, BrazilInstitute of Engineering and Geoscience, Federal University of West Para (UFOPA), Rua Vera Paz s/n, CEP 68035-110, Santarem-PA, BrazilDepartment of Meteorology, Geosciences Institute, Federal University of Para, Belém, PA 66075-110, BrazilDepartment of Environmental Dynamics, National Institute for Amazonian Research (INPA), Av. André Araújo 2936, CEP 69067-375, Manaus-AM, BrazilDepartment of Environmental Dynamics, National Institute for Amazonian Research (INPA), Av. André Araújo 2936, CEP 69067-375, Manaus-AM, BrazilDepartment of Environmental Dynamics, National Institute for Amazonian Research (INPA), Av. André Araújo 2936, CEP 69067-375, Manaus-AM, BrazilMeteorology Department, State University of Amazonas (UEA), Av. Darcy Vargas 1200, CEP 69050-020, Manaus-AM, BrazilDepartment of Earth System Science, University of California, Irvine, CA 92697, USARoyal Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, BelgiumCentro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510, Mexico city, Federal District, MexicoDepartment of Environmental and Climate Sciences, Brookhaven National Laboratory, Upton, NY 11973, USAEcology and Evolutionary Biology Department, University of Arizona, Cherry Avenue and University Boulevard, Tucson, AZ 85721, USANational Institute for Spatial Research, Center of Weather Forecasting and Climate Studies, Rod. Presidente Dutra, km 40, Cachoeira Paulista-SP, Brazil<p>Isoprene fluxes vary seasonally with changes in environmental factors (e.g., solar radiation and temperature) and biological factors (e.g., leaf phenology). However, our understanding of the seasonal patterns of isoprene fluxes and the associated mechanistic controls is still limited, especially in Amazonian evergreen forests. In this paper, we aim to connect intensive, field-based measurements of canopy isoprene flux over a central Amazonian evergreen forest site with meteorological observations and with tower-mounted camera leaf phenology to improve our understanding of patterns and causes of isoprene flux seasonality. Our results demonstrate that the highest isoprene emissions are observed during the dry and dry-to-wet transition seasons, whereas the lowest emissions were found during the wet-to-dry transition season. Our results also indicate that light and temperature cannot totally explain isoprene flux seasonality. Instead, the camera-derived leaf area index (LAI) of recently mature leaf age class (e.g., leaf ages of 3–5 months) exhibits the highest correlation with observed isoprene flux seasonality (<i>R</i><sup>2</sup> = 0.59, <i>p</i> < 0.05). Attempting to better represent leaf phenology in the Model of Emissions of Gases and Aerosols from Nature (MEGAN 2.1), we improved the leaf age algorithm by utilizing results from the camera-derived leaf phenology that provided LAI categorized into three different leaf ages. The model results show that the observations of age-dependent isoprene emission capacity, in conjunction with camera-derived leaf age demography, significantly improved simulations in terms of seasonal variations in isoprene fluxes (<i>R</i><sup>2</sup> = 0.52, <i>p</i> < 0.05). This study highlights the importance of accounting for differences in isoprene emission capacity across canopy leaf age classes and identifying forest adaptive mechanisms that underlie seasonal variation in isoprene emissions in Amazonia.</p>https://www.biogeosciences.net/15/4019/2018/bg-15-4019-2018.pdf |