@Article{WebbBPGGPBCCDFGMWW:2016:CHCoOv,
author = "Webb, Alex J. and Bosch, Hartmut and Parker, Robert J. and Gatti,
Luciana Vanni and Gloor, Emanuel and Palmer, Paul I. and Basso,
Luana S. and Chipperfield, Martyn P. and Correia, Caio S. C. and
Domingues, Lucas G. and Feng, Liang and Gonzi, Siegfried and
Miller, John B. and Warneke, Thorsten and Wilson, Christopher",
affiliation = "{University of Leicester} and {University of Leicester} and
{University of Leicester} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {University of Leeds} and {University of
Edinburgh} and {Instituto de Pesquisas Energ{\'e}ticas e
Nucleares (IPEN)} and {University of Leeds} and {Instituto de
Pesquisas Energ{\'e}ticas e Nucleares (IPEN)} and {Instituto de
Pesquisas Energ{\'e}ticas e Nucleares (IPEN)} and {University of
Edinburgh} and {University of Edinburgh} and {National Oceanic and
Atmospheric Administration (NOAA)} and {University of Bremen} and
{University of Leeds}",
title = "CH4 concentrations over the Amazon from GOSAT consistent with in
situ vertical profile data",
journal = "Journal of Geophysical Research: Atmospheres",
year = "2016",
volume = "121",
number = "18",
pages = "11006--11020",
month = "Sept.",
keywords = "GOSAT, amazon, methane, wetlands, aircraft, CH4.",
abstract = "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 -1.9ppb to 6.6ppb, while at two sites GOSAT XCH4 is
shown to be slightly higher than aircraft measurements, by 8.1ppb
and 9.7ppb. 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.",
doi = "10.1002/2016JD025263",
url = "http://dx.doi.org/10.1002/2016JD025263",
issn = "2169-8996 and 2169-897X",
language = "en",
targetfile = "Webb_ch4.pdf",
urlaccessdate = "27 abr. 2024"
}