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| Titel |
Impacts of seasonal and regional variability in biogenic VOC emissions on surface ozone in the Pearl River delta region, China |
| VerfasserIn |
S. Situ, A. Guenther, X. Wang, X. Jiang, A. Turnipseed, Z. Wu, J. Bai, X. Wang |
| 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 (2013-12-05), S.11803-11817 |
| Datensatznummer |
250085857
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| Publikation (Nr.) |
 copernicus.org/acp-13-11803-2013.pdf |
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| Zusammenfassung |
| This study investigated the impacts of seasonal and
regional variability in biogenic volatile organic compounds (BVOCs) on
surface ozone over the Pearl River delta (PRD) region in southern China in
2010 with the WRF–Chem/MEGAN (Weather Research and Forecasting coupled with Chemistry/Model of Emissions of Gases and
Aerosols from Nature) modeling system. Compared to observations in
the literature and this study, MEGAN tends to predict reasonable BVOC
emissions in summer, but may overestimate isoprene emissions in autumn, even
when the local high-resolution land-cover data and observed emission factors
of BVOCs from local plant species are combined to constrain the MEGAN BVOC
emissions model. With the standard MEGAN output, it is shown that the impact
of BVOC emissions on the surface ozone peak is ~3 ppb on
average with a maximum of 24.8 ppb over the PRD region in autumn, while the
impact is ~10 ppb on average, with a maximum value of 34.0 ppb
in summer. The areas where surface ozone is sensitive to BVOC emissions are
different in autumn and in summer, which is primarily due to the change of
prevailing wind over the PRD; nevertheless, in both autumn and summer, the surface ozone is most sensitive to the
BVOC emissions in the urban area because the area
is usually VOC-limited. Three additional experiments concerning the
sensitivity of surface ozone to MEGAN input variables were also performed to
assess the sensitivity of surface ozone to MEGAN drivers, and the results
reveal that land cover and emission factors of BVOCs are the most important
drivers and have large impacts on the predicted surface ozone. |
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