References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-10093-2010

Impact of transported background ozone inflow on summertime air quality in a California ozone exceedance area

Parrish

D. D.

¹ Aikin

K. C.

¹ ² Oltmans

S. J.

³ Johnson

B. J.

³ Ives

⁴ Sweeny

NOAA ESRL Chemical Sciences Division, 325 Broadway, Boulder, CO 80305, USA

CIRES, University of Colorado, Boulder, CO 80309, USA

NOAA ESRL Global Monitoring Division, 325 Broadway, Boulder, CO 80305, USA

Humboldt State Marine Lab, 570 Ewing St., Trinidad Head, CA, 95570, USA

27 10 2010

10 20 10093 10109

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/10093/2010/acp-10-10093-2010.pdf

Ozone sondes launched from Trinidad Head, California provide a measure of background O3 transported ashore, and allow an evaluation of the impact of this transport on air quality in California's Northern Sacramento Valley. A strong summertime vertical O3 gradient and correlation analysis indicate that O3-rich air from above the marine boundary layer is transported to the surface. Surface O3 is found to increase proportionally to the transported background. At the surface site experiencing the highest O3 concentrations, the mean maximum daily 8-h average (MDA8) O3 on exceedance days (i.e. those days when MDA8 O3 exceeds 75 ppbv) is 20 ppbv higher than on non-exceedance days. The transported background O3, as measured 22 h earlier by the Trinidad Head sondes, accounts for more than half (11 ppbv) of this difference. This finding contrasts with conclusions from model calculations that indicate the US policy relevant O3 background is generally 15–35 ppbv, and that it is lower, rather than higher, during pollution episodes. The present work indicates that O3 transported on hemispheric scales substantially impacts air quality in some areas of the US.

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