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| Titel |
Spatially resolving methane emissions in California: constraints from the CalNex aircraft campaign and from present (GOSAT, TES) and future (TROPOMI, geostationary) satellite observations |
| VerfasserIn |
K. J. Wecht, D. J. Jacob, M. P. Sulprizio, G. W. Santoni, S. C. Wofsy, R. Parker, H. Bösch, J. Worden |
| 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 ; 14, no. 15 ; Nr. 14, no. 15 (2014-08-14), S.8173-8184 |
| Datensatznummer |
250118948
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| Publikation (Nr.) |
 copernicus.org/acp-14-8173-2014.pdf |
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| Zusammenfassung |
| We apply a continental-scale inverse modeling system for North America based
on the GEOS-Chem model to optimize California methane emissions at
1/2° × 2/3° horizontal resolution using atmospheric observations
from the CalNex aircraft campaign (May–June 2010) and from satellites.
Inversion of the CalNex data yields a best estimate for total California
methane emissions of 2.86 ± 0.21 Tg a−1, compared with 1.92 Tg a−1
in the EDGAR v4.2 emission inventory used as a priori and 1.51 Tg a−1 in the
California Air Resources Board (CARB) inventory used for
state regulations of greenhouse gas emissions. These results are consistent
with a previous Lagrangian inversion of the CalNex data. Our inversion
provides 12 independent pieces of information to constrain the geographical
distribution of emissions within California. Attribution to individual
source types indicates dominant contributions to emissions from
landfills/wastewater (1.1 Tg a−1), livestock (0.87 Tg a−1), and
gas/oil (0.64 Tg a−1). EDGAR v4.2 underestimates emissions from
livestock, while CARB underestimates emissions from landfills/wastewater and
gas/oil. Current satellite observations from GOSAT can constrain methane
emissions in the Los Angeles Basin but are too sparse to constrain emissions
quantitatively elsewhere in California (they can still be qualitatively
useful to diagnose inventory biases). Los Angeles Basin emissions derived
from CalNex and GOSAT inversions are 0.42 ± 0.08 and
0.31 ± 0.08 Tg a−1
that the future TROPOMI satellite instrument (2015 launch) will be able to
constrain California methane emissions at a detail comparable to the CalNex
aircraft campaign. Geostationary satellite observations offer even greater
potential for constraining methane emissions in the future. |
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