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| Titel |
MAX-DOAS measurements of NO2, HCHO and CHOCHO at a rural site in Southern China |
| VerfasserIn |
X. Li, T. Brauers, A. Hofzumahaus, K. Lu, Y. P. Li, M. Shao, T. Wagner, A. Wahner |
| 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. 4 ; Nr. 13, no. 4 (2013-02-25), S.2133-2151 |
| Datensatznummer |
250018428
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| Publikation (Nr.) |
 copernicus.org/acp-13-2133-2013.pdf |
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| Zusammenfassung |
| We performed MAX-DOAS measurements during the PRIDE-PRD2006 campaign in the
Pearl River Delta region (PRD), China, for 4 weeks in July 2006 at a site
located 60 km north of Guangzhou. The vertical distributions of NO2,
HCHO, and CHOCHO were independently retrieved by an automated
iteration method. The NO2 mixing ratios measured by MAX-DOAS showed
reasonable agreement with the simultaneous, ground based in-situ data. The
tropospheric NO2 vertical column densities (VCDs) observed by OMI on
board EOS-Aura satellite were higher than with those by MAX-DOAS. The 3-D
chemical transport model CMAQ overestimated the NO2 VCDs as well as
the surface concentrations by about 65%. From this observation,
a reduction of NOx emission strength in CMAQ seems to be necessary in
order to well reproduce the NO2 observations. The average mixing
ratios of HCHO and CHOCHO were 7 ppb and 0.4 ppb,
respectively, higher than in other rural or semirural environments. The high
ratio of 0.062 between CHOCHO and HCHO corresponds to the high
VOCs reactivity and high HOx turnover rate consistent with other
observations during the campaign. |
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