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| Titel |
Growth in NOx emissions from power plants in China: bottom-up estimates and satellite observations |
| VerfasserIn |
S. W. Wang, Q. Zhang, D. G. Streets, K. B. He, R. V. Martin, L. N. Lamsal, D. Chen, Y. Lei, Z. Lu |
| 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. 10 ; Nr. 12, no. 10 (2012-05-21), S.4429-4447 |
| Datensatznummer |
250011160
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| Publikation (Nr.) |
 copernicus.org/acp-12-4429-2012.pdf |
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| Zusammenfassung |
| Using OMI (Ozone Monitoring Instrument) tropospheric NO2 columns and a
nested-grid 3-D global chemical transport model (GEOS-Chem), we investigated
the growth in NOx emissions from coal-fired power plants and their
contributions to the growth in NO2 columns in 2005–2007 in China. We
first developed a unit-based power plant NOx emission inventory for
2005–2007 to support this investigation. The total capacities of coal-fired
power generation have increased by 48.8% in 2005–2007, with 92.2% of
the total capacity additions coming from generator units with size ≥300
MW. The annual NOx emissions from coal-fired power plants were
estimated to be 8.11 Tg NO2 for 2005 and 9.58 Tg NO2 for 2007,
respectively. The modeled summer average tropospheric NO2 columns were
highly correlated (R2 = 0.79–0.82) with OMI measurements over grids
dominated by power plant emissions, with only 7–14% low bias, lending
support to the high accuracy of the unit-based power plant NOx emission
inventory. The ratios of OMI-derived annual and summer average tropospheric
NO2 columns between 2007 and 2005 indicated that most of the grids with
significant NO2 increases were related to power plant construction
activities. OMI had the capability to trace the changes of NOx
emissions from individual large power plants in cases where there is less
interference from other NOx sources. Scenario runs from GEOS-Chem model
suggested that the new power plants contributed 18.5% and 10% to the
annual average NO2 columns in 2007 in Inner Mongolia and North China,
respectively. The massive new power plant NOx emissions significantly
changed the local NO2 profiles, especially in less polluted areas. A
sensitivity study found that changes of NO2 shape factors due to
including new power plant emissions increased the summer average OMI
tropospheric NO2 columns by 3.8–17.2% for six selected locations,
indicating that the updated emission information could help to improve the
satellite retrievals. |
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