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| Titel |
Constraint of anthropogenic NOx emissions in China from different sectors: a new methodology using multiple satellite retrievals |
| VerfasserIn |
J.-T. Lin, M. B. McElroy, K. F. Boersma |
| 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 ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-07), S.63-78 |
| Datensatznummer |
250007891
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| Publikation (Nr.) |
 copernicus.org/acp-10-63-2010.pdf |
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| Zusammenfassung |
| A new methodology is developed to constrain Chinese anthropogenic emissions
of nitrogen oxides (NOx) from four major sectors (industry, power
plants, mobile and residential) in July 2008. It combines tropospheric
NO2 column retrievals from GOME-2 and OMI, taking advantage of their
different passing time over China (~10:00 a.m. LT (local time) versus
~02:00 p.m.) and consistent retrieval algorithms. The approach is based on the
difference of NOx columns at the overpass times of the two instruments;
it thus is less susceptible to the likely systematic errors embedded in
individual retrievals that are consistent with each other. Also, it
explicitly accounts for diurnal variations and uncertainties of NOx
emissions for individual sources. Our best top-down estimate suggests a
national budget of 6.8 TgN/yr (5.5 TgN/yr for East China), close to the a priori
bottom-up emission estimate from the INTEX-B mission for the year of 2006.
The top-down emissions are lower than the a priori near Beijing, in the northeastern
provinces and along the east coast; yet they exceed the a priori over many inland
regions. Systematic errors in satellite retrievals are estimated to lead to
underestimation of top-down emissions by at most 17% (most likely
10%). Effects of other factors on the top-down estimate are typically
less than 15% each, including lightning, soil emissions, mixing in
planetary boundary layer, anthropogenic emissions of carbon monoxide and
volatile organic compounds, magnitude of a priori emissions, assumptions on emission
diurnal variations, and uncertainties in the four sectors. The a posteriori emission
budget is 5.7 TgN/yr for East China. |
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