Intercontinental Source Attribution of Ozone Pollution at Western U.S. Sites Using an Adjoint Method

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Intercontinental Source Attribution of Ozone Pollution at Western U.S. Sites Using an Adjoint Method

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Title: Intercontinental Source Attribution of Ozone Pollution at Western U.S. Sites Using an Adjoint Method
Author: Zhang, Lin; Jacob, Daniel J.; Kopacz, Monika; Henze, Daven K.; Singh, Kumaresh; Jaffe, Daniel A.

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Citation: Zhang, Lin, Daniel J. Jacob, Monika Kopacz, Daven K. Henze, Kumaresh Singh, and Daniel A. Jaffe. 2009. Intercontinental source attribution of ozone pollution at western U.S. sites using an adjoint method. Geophysical Research Letters 36: L11810.
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Abstract: We use the GEOS-Chem chemical transport model and its adjoint to quantify source contributions to ozone pollution at two adjacent sites on the U.S. west coast in spring 2006: Mt. Bachelor Observatory (MBO) at 2.7 km altitude and Trinidad Head (TH) at sea level. The adjoint computes the sensitivity of ozone concentrations at the receptor sites to ozone production rates at 2° × 2.5° resolution over the history of air parcels reaching the site. MBO experiences distinct Asian ozone pollution episodes; most of the ozone production in these episodes takes place over East Asia with maxima over northeast China and southern Japan, adding to a diffuse background production distributed over the extratropical northern hemisphere. TH shows the same Asian origins for ozone as MBO but no distinct Asian pollution episodes. We find that transpacific pollution plumes transported in the free troposphere are diluted by a factor of 3 when entrained into the boundary layer, explaining why these plumes are undetectable in U.S. surface air.
Published Version: doi:10.1029/2009GL037950
Other Sources: http://acmg.seas.harvard.edu/cvdj.html#P2009
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3627131

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  • FAS Scholarly Articles [7078]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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