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| Titel |
Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport |
| VerfasserIn |
H. Guo, F. Jiang, H. R. Cheng, I. J. Simpson, X. M. Wang, A. J. Ding, T. J. Wang, S. M. Saunders, T. Wang, S. H. M. Lam, D. R. Blake, Y. L. Zhang, M. Xie |
| 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 ; 9, no. 19 ; Nr. 9, no. 19 (2009-10-02), S.7343-7360 |
| Datensatznummer |
250007664
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| Publikation (Nr.) |
 copernicus.org/acp-9-7343-2009.pdf |
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| Zusammenfassung |
| An intensive field measurement study was conducted simultaneously at a site
within the inland Pearl River Delta (PRD) region (WQS) and a site in Hong
Kong (TC) between 22 October and 1 December 2007. Ambient air pollutants
measured included O3, NOx, CO, SO2, NMHCs, and carbonyls. The
purpose is to improve our understanding of the interplay among local and
regional air pollutants in the Hong Kong area, and the influence of regional
transport on local air pollutants. The results indicate that the mean levels
of air pollutants at the WQS site were much higher than those at the TC
site, except NOx. Thirteen O3 episode days (daily O3 peak in
excess of 122 ppbv) were monitored at WQS during the study period, while
only 2 days were recorded at TC. Diurnal variations of O3 showed higher
nighttime levels of O3 at TC than at WQS as well as more photochemical
activity at WQS than TC. Remarkable differences in diurnal variations were
also found between high and low O3 pollution days at each site,
implying that Hong Kong is more acutely VOC-limited than the inland PRD
region. Ratio analyses for trace gases and VOCs and back trajectory
calculation revealed that the air masses arriving at WQS were more aged due
to regional influence, whereas the air masses at TC were mainly affected by
local emissions and/or regional transport. In addition, the influence of
regional transport from Eastern China on the primary pollutants of Hong Kong
was noticeable, whereas the air masses from the inland PRD region (e.g.
Dongguan and Huizhou) had significant influence on the air pollutants at
WQS, and the anthropogenic emissions in Eastern PRD (e.g. Shenzhen) played
an important role on the photochemical ozone pollution in Western Hong Kong.
These results confirm that regional and sub-regional transport of air
pollution has a complex and significant impact on local air pollutants in
this region. |
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