globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025263
论文题名:
CH4 concentrations over the Amazon from GOSAT consistent with in situ vertical profile data
作者: Webb A.J.; Bösch H.; Parker R.J.; Gatti L.V.; Gloor E.; Palmer P.I.; Basso L.S.; Chipperfield M.P.; Correia C.S.C.; Domingues L.G.; Feng L.; Gonzi S.; Miller J.B.; Warneke T.; Wilson C.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期:18
起始页码: 11006
结束页码: 11020
语种: 英语
英文关键词: aircraft ; amazon ; CH4 ; GOSAT ; methane ; wetlands
Scopus关键词: airborne survey ; atmospheric modeling ; concentration (composition) ; GOSAT ; in situ measurement ; methane ; satellite data ; seasonal variation ; seasonality ; stratosphere ; vertical profile ; wetland ; Amazon Basin ; Amazonia ; Bolivia
英文摘要: The Amazon Basin contains large wetland ecosystems which are important sources of methane (CH4). Spaceborne observations of atmospheric CH4 can provide constraints on emissions from these remote ecosystems, but lack of validation precludes robust estimates. We present the first validation of CH4 columns in the Amazon from the Greenhouse gases Observing SATellite (GOSAT) using aircraft measurements of CH4 over five sites across the Amazon Basin. These aircraft profiles, combined with stratospheric results from the TOMCAT chemical transport model, are vertically integrated allowing direct comparison to the GOSAT XCH4 measurements (the column-averaged dry air mole fraction of CH4). The measurements agree within uncertainties or show no significant difference at three of the aircraft sites, with differences ranging from −1.9 ppb to 6.6 ppb, while at two sites GOSAT XCH4 is shown to be slightly higher than aircraft measurements, by 8.1 ppb and 9.7 ppb. The seasonality in XCH4 seen by the aircraft profiles is also well captured (correlation coefficients from 0.61 to 0.90). GOSAT observes elevated concentrations in the northwest corner of South America in the dry season and enhanced concentrations elsewhere in the Amazon Basin in the wet season, with the strongest seasonal differences coinciding with regions in Bolivia known to contain large wetlands. Our results are encouraging evidence that these GOSAT CH4 columns are generally in good agreement with in situ measurements, and understanding the magnitude of any remaining biases between the two will allow more confidence in the application of XCH4 to constrain Amazonian CH4 fluxes. ©2016. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62815
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Earth Observation Science Group, Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom; National Centre for Earth Observation, University of Leicester, Leicester, United Kingdom; Instituto de Pesquisas Energéticas e Nucleares–Comissao Nacional de Energia Nuclear–Atmospheric Chemistry Laboratory, Cidade Universitária, São José dos Campos, Brazil; Greenhouse Gases Laboratory, Instituto Nacional de Pesquisas Espaciais, São Paulo, Brazil; School of Geography, University of Leeds, Leeds, United Kingdom; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; NCEO, University of Edinburgh, Edinburgh, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; NCEO, University of Leeds, Leeds, United Kingdom; Global Monitoring Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States; Institute of Environmental Physics, University of Bremen, Bremen, Germany

Recommended Citation:
Webb A.J.,Bösch H.,Parker R.J.,et al. CH4 concentrations over the Amazon from GOSAT consistent with in situ vertical profile data[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)
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