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| Titel |
WRF-Chem simulations in the Amazon region during wet and dry season transitions: evaluation of methane models and wetland inundation maps |
| VerfasserIn |
V. Beck, C. Gerbig, T. Koch, M. M. Bela, K. M. Longo, S. R. Freitas, J. O. Kaplan, C. Prigent, P. Bergamaschi, M. Heimann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 16 ; Nr. 13, no. 16 (2013-08-19), S.7961-7982 |
| Datensatznummer |
250085633
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| Publikation (Nr.) |
 copernicus.org/acp-13-7961-2013.pdf |
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| Zusammenfassung |
| The Amazon region, being a large source of methane (CH4), contributes
significantly to the global annual CH4 budget. For the first time, a
forward and inverse modelling framework on regional scale for the purpose of
assessing the CH4 budget of the Amazon region is implemented. Here, we
present forward simulations of CH4 as part of the forward and inverse
modelling framework based on a modified version of the Weather Research and
Forecasting model with chemistry that allows for passive tracer transport of
CH4, carbon monoxide, and carbon dioxide (WRF-GHG), in combination with
two different process-based bottom-up models of CH4 emissions from
anaerobic microbial production in wetlands and additional datasets
prescribing CH4 emissions from other sources such as biomass burning,
termites, or other anthropogenic emissions. We compare WRF-GHG simulations
on 10 km horizontal resolution to flask and continuous CH4 observations
obtained during two airborne measurement campaigns within the Balanço
Atmosférico Regional de Carbono na Amazônia (BARCA) project in
November 2008 and May 2009. In addition, three different wetland inundation
maps, prescribing the fraction of inundated area per grid cell, are
evaluated. Our results indicate that the wetland inundation maps based on
remote-sensing data represent the observations best except for the northern
part of the Amazon basin and the Manaus area. WRF-GHG was able to represent
the observed CH4 mixing ratios best at days with less convective
activity. After adjusting wetland emissions to match the averaged observed
mixing ratios of flights with little convective activity, the monthly
CH4 budget for the Amazon basin obtained from four different
simulations ranges from 1.5 to 4.8 Tg for November 2008 and from 1.3 to 5.5 Tg
for May 2009. This corresponds to an average CH4 flux of 9–31 mg m−2 d−1
for November 2008 and 8–36 mg m−2 d−1 for May 2009. |
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