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| Titel |
Regional nitrogen oxides emission trends in East Asia observed from space |
| VerfasserIn |
B. Mijling, R. J. van der A, Q. Zhang |
| 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. 23 ; Nr. 13, no. 23 (2013-12-11), S.12003-12012 |
| Datensatznummer |
250085871
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| Publikation (Nr.) |
 copernicus.org/acp-13-12003-2013.pdf |
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| Zusammenfassung |
| Due to changing economic activity, emissions of air pollutants in East Asia
are changing rapidly in space and time. Monthly emission estimates of nitrogen
oxides derived from satellite observations provide valuable insight into the
evolution of anthropogenic activity on a regional scale. We present the
first results of a new emission estimation algorithm, specifically designed
to use daily satellite observations of column concentrations for fast
updates of emissions of short-lived atmospheric constituents on a mesoscopic
scale (~ 0.25° × 0.25°). The algorithm is used to construct a monthly
NOx emission time series for the period 2007–2011 from tropospheric NO2
observations of GOME-2 for East Chinese provinces and surrounding countries.
The new emission estimates correspond well with the bottom-up inventory of
EDGAR v4.2, but are smaller than the inventories of INTEX-B and MEIC. They
reveal a strong positive trend during 2007–2011 for almost all Chinese
provinces, related to the country's economic development. We find a 41%
increment of NOx emissions in East China during this period, which
shows the need to update emission inventories in this region on a regular
basis. Negative emission trends are found in Japan and South Korea, which
can be attributed to a combined effect of local environmental policy and
global economic crises. Analysis of seasonal variation distinguishes between
regions with dominant anthropogenic or biogenic emissions. For regions with
a mixed anthropogenic and biogenic signature, the opposite seasonality can
be used for an estimation of the separate emission contributions. Finally,
the non-local concentration/emission relationships calculated by the
algorithm are used to quantify the direct effect of regional NOx
emissions on tropospheric NO2 concentrations outside the region. For
regions such as North Korea and the Beijing municipality, a substantial part
of the tropospheric NO2 originates from emissions elsewhere. |
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