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

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.

Artigo

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

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 signifi...

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Autor principal:	Botía, Santiago
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.
Grau:	Artigo
Idioma:	English
Publicado em:	Atmospheric Chemistry and Physics 2020
Assuntos:	Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia
Acesso em linha:	https://repositorio.inpa.gov.br/handle/1/23246

id	oai:repositorio:1-23246
recordtype	dspace
spelling	oai:repositorio:1-23246 Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO) 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. Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia 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. 2020-07-03T21:06:30Z 2020-07-03T21:06:30Z 2020 Artigo https://repositorio.inpa.gov.br/handle/1/23246 10.5194/acp-20-6583-2020 en Volume 20, Número 11, Pags. 6583-6606 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ Atmospheric Chemistry and Physics
institution	Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection	INPA-RI
language	English
topic	Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia
spellingShingle	Atmospheric Chemistry Diurnal Variation Methane Mixing Ratio Seasonal Variation Sensible Heat Flux Stratification wind direction Wind Velocity Amazonia Botía, Santiago Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)
topic_facet	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.
format	Artigo
author	Botía, Santiago
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.
author2Str	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.
title	Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)
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)
publisher	Atmospheric Chemistry and Physics
publishDate	2020
url	https://repositorio.inpa.gov.br/handle/1/23246
_version_	1787141662658527232
score	11.675608

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

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