 |
| Titel |
Slower ozone production in Houston, Texas following emission reductions: evidence from Texas Air Quality Studies in 2000 and 2006 |
| VerfasserIn |
W. Zhou, D. S. Cohan, B. H. Henderson |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 6 ; Nr. 14, no. 6 (2014-03-18), S.2777-2788 |
| Datensatznummer |
250118512
|
| Publikation (Nr.) |
 copernicus.org/acp-14-2777-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Airborne measurements from two Texas Air Quality Study (TexAQS) field
campaigns have been used to investigate changes of ozone production in
Houston, Texas, from 2000 to 2006, a period of major emission reduction
measures for petrochemical and other sources. Simultaneous declines in
nitrogen oxides (NOx = NO + NO2) and highly reactive volatile
organic compounds (HRVOCs) were observed between the two periods. We
simulate HOx (OH and HO2) and organic radicals with a box model,
the Dynamically Simple Model of Atmospheric Chemical Complexity, constrained
by available airborne observations. Parameters such as total radical
production, total OH reactivity of VOCs and ozone production rate (OPR) are
computed to characterize the change of ozone production between 2000 and
2006 in the Houston area. The reduction in HRVOCs led to a decline in total
radical production by 20–50%. Ozone production rates in the Houston area
declined by 40–50% from 2000 to 2006, to which the reduction in
NOx and HRVOCs made large contributions. Despite the significant decline in OPR,
ozone production efficiency held steady, and VOC-sensitive conditions
dominated during times of most rapid ozone formation, while the slow ozone
formation continued to be NOx-limited. Our results highlight the
importance of a balanced approach of ongoing HRVOC controls with
NOx controls to further reduce O3 levels in the Houston area. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|