Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)

Detalhes bibliográficos
Autor(a) principal: Botía, Santiago
Data de Publicação: 2020
Outros Autores: 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.
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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spelling 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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