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| Titel |
Observational studies of the meteorological characteristics associated with poor air quality over the Pearl River Delta in China |
| VerfasserIn |
M. Wu, D. Wu, Q. Fan, B. M. Wang, H. W. Li, S. J. Fan |
| 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. 21 ; Nr. 13, no. 21 (2013-11-05), S.10755-10766 |
| Datensatznummer |
250085791
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| Publikation (Nr.) |
 copernicus.org/acp-13-10755-2013.pdf |
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| Zusammenfassung |
| The structure of the atmospheric boundary layer (ABL) and its influence on
regional air quality over the Pearl River Delta (PRD) were examined through
two intensive observations in October 2004 and July 2006. Analytical results
show the presence of two types of typical weather conditions associated with
poor air quality over the PRD. The first is the warm period before a cold
front (WPBCF) and the second is the subsidence period controlled by a
tropical cyclone (SPCTC). Two typical low air quality situations, which are
affected by WPBCF and SPCTC, and one high air quality situation were
analysed in detail. Results showed that continuously low or calm ground
winds resulted in the accumulation of pollutants, and sea-land breezes had
an important role during low air quality conditions. Data on recirculation
factors showed that recirculation was significant during low air quality
conditions, and steady transportation occurred during high air quality
conditions. The ventilation index and the 24 h average ventilation index
during high air quality conditions were significantly higher than those
during low air quality conditions. Deep and stable inversion layers inside
the ABL remarkably affected low air quality. Surface and low-altitude
inversions were usually observed during WPBCF, contrary to during SPCTC,
during which only the low-altitude inversion appeared frequently. |
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