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| Titel |
Regional modeling of tropospheric NO2 vertical column density over East Asia during the period 2000–2010: comparison with multisatellite observations |
| VerfasserIn |
S. Itahashi, I. Uno, H. Irie, J.-I. Kurokawa, T. Ohara |
| 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. 7 ; Nr. 14, no. 7 (2014-04-09), S.3623-3635 |
| Datensatznummer |
250118578
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| Publikation (Nr.) |
 copernicus.org/acp-14-3623-2014.pdf |
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| Zusammenfassung |
| Satellite observations of the tropospheric NO2 vertical column density
(VCD) are closely correlated to, and thus can be used to estimate, surface
NOx emissions. In this study, the NO2 VCD simulated by a regional
chemical transport model with emissions data from the updated Regional
Emission inventory in ASia (REAS) version 2.1 were validated through
comparison with multisatellite observations during the period 2000–2010. Rapid growth in NO2 VCD (~11% year−1)
driven by the expansion of anthropogenic NOx emissions was
identified above the central eastern China (CEC) region, except for the
period during the economic downturn. In contrast, slightly decreasing trends
(~2% year−1) were identified above Japan accompanied by a
decline in anthropogenic emissions. To systematically compare the modeled
NO2 VCD, we estimated sampling bias and the effect of applying the
averaging kernel information, with particular focus on the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) data.
Using the updated REAS, the modeled NO2 VCD reasonably reproduced
annual trends observed by multisatellites, suggesting that the rate of
increase of NOx emissions estimated by the updated REAS inventory would be
robust. Province-scale revision of emissions above CEC is needed to further
refine emission inventories. Based on the close linear relationship between
modeled and observed NO2 VCD and anthropogenic NOx emissions, NOx
emissions in 2009 and 2010, which were not covered by the updated REAS
inventory, were estimated. NOx emissions from anthropogenic sources in China
in 2009 and 2010 were determined to be 26.4 and 28.5 Tg year−1, respectively,
indicating that NOx emissions increased more than twofold between 2000 and
2010. This increase reflected the strong growth of anthropogenic emissions
in China following the rapid recovery from the economic downturn from late
2008 until mid-2009. Our method consists of simple estimations from
satellite observations and provides results that are consistent with the
most recent inventory of emissions data for China. |
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