气候变化领域集成服务门户(CCPortal): Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)

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DOI	10.5194/acp-20-6583-2020
	Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)
	Botía S.; Gerbig C.; Marshall J.; Lavric J.V.; Walter D.; Pöhlker C.; Holanda B.; Fisch G.; Carioca De Araújo A.; Sá M.O.; Teixeira P.R.; Resende A.F.; DIas-Junior C.Q.; Van Asperen H.; Oliveira P.S.; Stefanello M.; Acevedo O.C.
发表日期	2020
ISSN	1680-7316
起始页码	6583
结束页码	6606
卷号	20 期号:11
英文摘要	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.
语种	英语
scopus关键词	atmospheric chemistry; diurnal variation; methane; mixing ratio; seasonal variation; sensible heat flux; stratification; wind direction; wind velocity; Amazonia
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141297
作者单位	Max Planck Institute for Biogeochemistry, Hans-Knoell-Straße 10, Jena, 07745, Germany; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55020, Germany; Instituto de Aeronautica e Espaço (IAE), Departamento de Ciência e Tecnologia Aeroespacial (DCTA), São José dos Campos, SP, Brazil; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Trav. Dr. Enéas Pinheiro, Belém, PA, Brazil; Instituto Nacional de Pesquisas da Amazônia (INPA), Av. André Araújo 2936, Manaus, AM, Brazil; Instituto Federal de Educação, Ciência e Tecnologia Do Pará, Belém, PA, Brazil; Institute of Environmental Physics, University of Bremen, Otto-Hahn-Alle 1, Bremen, 28359, Germany; Departamento de Física, Universidade Federal de Santa Maria, Av. Roraima 1000, Santa Maria, RS, Brazil
推荐引用方式 GB/T 7714	Botía S.,Gerbig C.,Marshall J.,et al. Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)[J],2020,20(11).
APA	Botía S..,Gerbig C..,Marshall J..,Lavric J.V..,Walter D..,...&Acevedo O.C..(2020).Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO).Atmospheric Chemistry and Physics,20(11).
MLA	Botía S.,et al."Understanding nighttime methane signals at the Amazon Tall Tower Observatory (ATTO)".Atmospheric Chemistry and Physics 20.11(2020).