Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/23246 |
Resumo: | Methane (CH4) atmospheric mixing ratio measurements are analyzed for the period between June 2013 and November 2018 at the Amazon Tall Tower Observatory (ATTO). We describe the seasonal and diurnal patterns of nighttime events in which CH4 mixing ratios at the uppermost (79ma.g.l.) inlet are significantly higher than the lowermost inlet (4ma.g.l.) by 8ppb or more. These nighttime events were found to be associated with a wind direction originating from the southeast and wind speeds between 2 and 5ms-1. We found that these events happen under specific nighttime atmospheric conditions when compared to other nights, exhibiting less variable sensible heat flux, low net radiation and a strong thermal stratification above the canopy. Our analysis indicates that even at wind speeds of 5.8ms-1 the turbulence intensity, given by the standard deviation of the vertical velocity, is suppressed to values lower than 0.3ms-1. Given these findings, we suggest that these nighttime CH4 enhancements are advected from their source location by horizontal nonturbulent motions. The most likely source location is the Uatumã River, possibly influenced by dead stands of flooded forest trees that may be enhancing CH4 emissions from those areas. Finally, biomass burning and the Amazon River were discarded as potential CH4 sources. © 2020 Copernicus GmbH. All rights reserved. |
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Botía, SantiagoGerbig, ChristophMarshall, JuliaLavric, J. V.Walter, DavidPöhlker, ChristopherA Holanda, BrunaFisch, Gilberto FernandoAraüjo, Alessandro Carioca deSá, Marta O.Teixeira, Paulo R.Resende, Angélica F.Dias Júnior, Cléo Quaresmavan Asperen, Hella L.Oliveira, Pablo S.Stefanello, Michel B.Acevedo, Otávio C.2020-07-03T21:06:30Z2020-07-03T21:06:30Z2020https://repositorio.inpa.gov.br/handle/1/2324610.5194/acp-20-6583-2020Methane (CH4) atmospheric mixing ratio measurements are analyzed for the period between June 2013 and November 2018 at the Amazon Tall Tower Observatory (ATTO). We describe the seasonal and diurnal patterns of nighttime events in which CH4 mixing ratios at the uppermost (79ma.g.l.) inlet are significantly higher than the lowermost inlet (4ma.g.l.) by 8ppb or more. These nighttime events were found to be associated with a wind direction originating from the southeast and wind speeds between 2 and 5ms-1. We found that these events happen under specific nighttime atmospheric conditions when compared to other nights, exhibiting less variable sensible heat flux, low net radiation and a strong thermal stratification above the canopy. Our analysis indicates that even at wind speeds of 5.8ms-1 the turbulence intensity, given by the standard deviation of the vertical velocity, is suppressed to values lower than 0.3ms-1. Given these findings, we suggest that these nighttime CH4 enhancements are advected from their source location by horizontal nonturbulent motions. The most likely source location is the Uatumã River, possibly influenced by dead stands of flooded forest trees that may be enhancing CH4 emissions from those areas. Finally, biomass burning and the Amazon River were discarded as potential CH4 sources. © 2020 Copernicus GmbH. All rights reserved.Volume 20, Número 11, Pags. 6583-6606Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessAtmospheric ChemistryDiurnal VariationMethaneMixing RatioSeasonal VariationSensible Heat FluxStratificationwind directionWind VelocityAmazoniaUnderstanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleAtmospheric Chemistry and Physicsengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPA1/232462020-07-16 12:37:50.66oai:repositorio:1/23246Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-07-16T16:37:50Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
title |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
spellingShingle |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) Botía, Santiago Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia |
title_short |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
title_full |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
title_fullStr |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
title_full_unstemmed |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
title_sort |
Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) |
author |
Botía, Santiago |
author_facet |
Botía, Santiago Gerbig, Christoph Marshall, Julia Lavric, J. V. Walter, David Pöhlker, Christopher A Holanda, Bruna Fisch, Gilberto Fernando Araüjo, Alessandro Carioca de Sá, Marta O. Teixeira, Paulo R. Resende, Angélica F. Dias Júnior, Cléo Quaresma van Asperen, Hella L. Oliveira, Pablo S. Stefanello, Michel B. Acevedo, Otávio C. |
author_role |
author |
author2 |
Gerbig, Christoph Marshall, Julia Lavric, J. V. Walter, David Pöhlker, Christopher A Holanda, Bruna Fisch, Gilberto Fernando Araüjo, Alessandro Carioca de Sá, Marta O. Teixeira, Paulo R. Resende, Angélica F. Dias Júnior, Cléo Quaresma van Asperen, Hella L. Oliveira, Pablo S. Stefanello, Michel B. Acevedo, Otávio C. |
author2_role |
author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Botía, Santiago Gerbig, Christoph Marshall, Julia Lavric, J. V. Walter, David Pöhlker, Christopher A Holanda, Bruna Fisch, Gilberto Fernando Araüjo, Alessandro Carioca de Sá, Marta O. Teixeira, Paulo R. Resende, Angélica F. Dias Júnior, Cléo Quaresma van Asperen, Hella L. Oliveira, Pablo S. Stefanello, Michel B. Acevedo, Otávio C. |
dc.subject.eng.fl_str_mv |
Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia |
topic |
Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia |
description |
Methane (CH4) atmospheric mixing ratio measurements are analyzed for the period between June 2013 and November 2018 at the Amazon Tall Tower Observatory (ATTO). We describe the seasonal and diurnal patterns of nighttime events in which CH4 mixing ratios at the uppermost (79ma.g.l.) inlet are significantly higher than the lowermost inlet (4ma.g.l.) by 8ppb or more. These nighttime events were found to be associated with a wind direction originating from the southeast and wind speeds between 2 and 5ms-1. We found that these events happen under specific nighttime atmospheric conditions when compared to other nights, exhibiting less variable sensible heat flux, low net radiation and a strong thermal stratification above the canopy. Our analysis indicates that even at wind speeds of 5.8ms-1 the turbulence intensity, given by the standard deviation of the vertical velocity, is suppressed to values lower than 0.3ms-1. Given these findings, we suggest that these nighttime CH4 enhancements are advected from their source location by horizontal nonturbulent motions. The most likely source location is the Uatumã River, possibly influenced by dead stands of flooded forest trees that may be enhancing CH4 emissions from those areas. Finally, biomass burning and the Amazon River were discarded as potential CH4 sources. © 2020 Copernicus GmbH. All rights reserved. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-07-03T21:06:30Z |
dc.date.available.fl_str_mv |
2020-07-03T21:06:30Z |
dc.date.issued.fl_str_mv |
2020 |
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 |
https://repositorio.inpa.gov.br/handle/1/23246 |
dc.identifier.doi.none.fl_str_mv |
10.5194/acp-20-6583-2020 |
url |
https://repositorio.inpa.gov.br/handle/1/23246 |
identifier_str_mv |
10.5194/acp-20-6583-2020 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 20, Número 11, Pags. 6583-6606 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Atmospheric Chemistry and Physics |
publisher.none.fl_str_mv |
Atmospheric Chemistry and Physics |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional do INPA instname:Instituto Nacional de Pesquisas da Amazônia (INPA) instacron:INPA |
instname_str |
Instituto Nacional de Pesquisas da Amazônia (INPA) |
instacron_str |
INPA |
institution |
INPA |
reponame_str |
Repositório Institucional do INPA |
collection |
Repositório Institucional do INPA |
repository.name.fl_str_mv |
Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA) |
repository.mail.fl_str_mv |
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1793236261635358720 |