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The Weekend Effect Within and Downwind of Sacramento: Part 1. Observations of Ozone, Nitrogen Oxides, and Voc Reactivity : Volume 6, Issue 6 (16/11/2006)

By Murphy, J. G.

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Book Id: WPLBN0003983991
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: The Weekend Effect Within and Downwind of Sacramento: Part 1. Observations of Ozone, Nitrogen Oxides, and Voc Reactivity : Volume 6, Issue 6 (16/11/2006)  
Author: Murphy, J. G.
Volume: Vol. 6, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Cleary, P. A., Wooldridge, P. J., Cohen, R. C., Day, D. A., Goldstein, A. H., Murphy, J. G., & Millet, D. B. (2006). The Weekend Effect Within and Downwind of Sacramento: Part 1. Observations of Ozone, Nitrogen Oxides, and Voc Reactivity : Volume 6, Issue 6 (16/11/2006). Retrieved from http://community.ebooklibrary.org/


Description
Description: University of California at Berkeley, Department of Chemistry, Berkeley, CA, USA. Day-of-week patterns in human activities can be used to examine the ways in which differences in primary emissions result in changes in the rates of photochemical reactions, and the production of secondary pollutants. Data from twelve California Air Resources Board monitoring sites in Sacramento, CA, and the downwind Mountain Counties air basin are analyzed to reveal day of week patterns in ozone and its precursors in the summers of 1998–2002. This routine monitoring data is complemented by comprehensive data sets of ozone and nitrogen oxide concentrations and VOC reactivity obtained in the summers of 2001 and 2003 at three sites in the region. Daytime concentrations of nitrogen oxides (NOx) are approximately 35% lower on weekends at all the sites, whereas the VOC reactivity changes by less than 10%. All six sites in the Sacramento Valley have higher 8-h maximum average ozone on the weekend and are more likely to exceed the national standard of 85 ppb on the weekend. In contrast, all the sites in the Mountain Counties are less likely to exceed the federal ozone standard on the weekend. Analysis of the day-of-week trends in odd oxygen show that the weekend effect of ozone within Sacramento is strongly influenced by NO sources close to the monitoring sites. This suggests that ozone measurements from monitoring sites close to highways, including two rural locations, may not be representative of the regional abundance, and lead to underestimates of long term exposure for humans and ecosystems.

Summary
The weekend effect within and downwind of Sacramento: Part 1. Observations of ozone, nitrogen oxides, and VOC reactivity

 

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