CHsub(4) concentrations over the Amazon from GOSAT consistent with in situ vertical profile data
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2016
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Journal of Geophysical Research: Atmospheres
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The Amazon Basin contains large wetland ecosystems which are important
sources of methane (CH4). Space-borne observations of atmospheric CH4
provide constraints on emissions from these remote ecosystems, but lack of
validation precludes robust estimates. We present the rst validation of CH4
columns in the Amazon from the Greenhouse gases Observing SATellite (GOSAT)
using dedicated vertical pro le measurements of CH4 over ve sites across
the Amazon Basin. These aircraft pro les, combined with the TOMCAT stratospheric
model, are vertically integrated allowing direct comparison to the GOSAT
measurements. The absolute columns agree within uncertainties or show no
signi cant di erence at three of the aircraft sites (-1.9 2.2 ppb and 3.6 4.3
ppb at one site with two di erent campaigns; and 3.6 1.7 ppb, and 6.6 2.6
ppb at the other two), whilst at two sites GOSAT XCH4 is shown to be slightly
higher than aircraft measurements, by up to approximately 10 ppb in the
most di ering case (8.1 2.1 ppb and 9.7 2.8 ppb). The seasonality in XCH4
seen by the aircraft pro les is also well captured. GOSAT observes elevated
concentrations in the north-west corner of South America in the dry season
and enhanced concentrations elsewhere in the Amazon Basin in the wet season;
with the strongest seasonal di erences coinciding with regions in Bolivia
known to contain large wetlands. Our results are encouraging evidence
that these GOSAT CH4 columns are in good agreement with in situ measurements
and can be reliably used to provide new insights into tropical methane
emissions
Como referenciar
WEBB, ALEX J.; BOSCH, HARTMUT; PARKER, ROBERT J.; GATTI, LUCIANA V.; GLOOR, EMANUEL; PALMER, PAUL I.; BASSO, LUANA S.; CHIPPERFIELD, MARTIN P.; CORREIA, CAIO S.C.; DOMINGUES, LUCAS G.; FENG, LIANG; GONZI, SIEGFRIED; MILLER, JOHN B.; WARNEKE, THORSTEN; WILSON, CHRISTOPHER. CHsub(4) concentrations over the Amazon from GOSAT consistent with in situ vertical profile data. Journal of Geophysical Research: Atmospheres, v. 121, n. 18, p. 11,006-11,020, 2016. DOI: 10.1002/2016JD025263. Disponível em: http://repositorio.ipen.br/handle/123456789/26760. Acesso em: 13 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.