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Titel |
Satellite constraint for emissions of nitrogen oxides from anthropogenic, lightning and soil sources over East China on a high-resolution grid |
VerfasserIn |
J.-T. Lin |
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 ; 12, no. 6 ; Nr. 12, no. 6 (2012-03-23), S.2881-2898 |
Datensatznummer |
250010942
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Publikation (Nr.) |
copernicus.org/acp-12-2881-2012.pdf |
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Zusammenfassung |
Vertical column densities (VCDs) of tropospheric nitrogen dioxide (NO2)
retrieved from space provide valuable information to estimate emissions of
nitrogen oxides (NOx) inversely. Accurate emission attribution to individual
sources, important both for understanding the global biogeochemical cycling
of nitrogen and for emission control, remains difficult. This study presents
a regression-based multi-step inversion approach to estimate emissions of
NOx from anthropogenic, lightning and soil sources individually for 2006
over East China on a 0.25° long × 0.25° lat grid, employing the
DOMINO product version 2 retrieved from the Ozone Monitoring Instrument. The
inversion is done gridbox by gridbox to derive the respective emissions,
taking advantage of differences in seasonality between anthropogenic and
natural sources. Lightning and soil emissions are combined together for any
given gridbox due to their similar seasonality; and their different spatial
distributions are used implicitly for source separation to some extent. The
nested GEOS-Chem model for East Asia is used to simulate the seasonal
variations of different emission sources and impacts on VCDs of NO2 for the
inversion purpose. Sensitivity tests are conducted to evaluate key
assumptions embedded in the inversion process. The inverse estimate suggests
annual budgets of about 7.1 TgN (±39%), 0.21 TgN (±61%),
and 0.38 TgN (±65%) for the a posteriori anthropogenic, lightning
and soil emissions, respectively, about 18–23% higher than the respective
a priori values. The enhancements in anthropogenic emissions are largest in
cities and areas with extensive use of coal, particularly in the north in
winter, as evident on the high-resolution grid. Derived soil emissions are
consistent with recent bottom-up estimates. They are less than 6% of
anthropogenic emissions annually, increasing to about 13% for July.
Derived lightning emissions are about 3% of anthropogenic emissions
annually and about 10% in July. Overall, anthropogenic emissions are
found to be the dominant source of NOx over East China with important
implications for nitrogen control. |
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