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PPT : Transboundary influences on US background ozone

Work sponsored by U.S. Department of Energy, Office of Fossil Energy, through a contract with Argonne National Laboratory According to EPA, counties violating the current 80 ppb ozone standard are largely limited to southern California, the Northeast coastal corridor, and isolated other parts of the eastern US EPA further shows that lowering the standard to 75 ppb or 70 ppb would significantly increase the number of counties in violation, based on current air quality data Application of GEOS-Chem global air quality model to quantify transboundary pollution influence

GEOS-Chem is a global model of ozone-PM chemistry using here NASA/GEOS assimilated meteorological data for 2001; horizontal resolution is 1o lat x 1o long (about 70×50 sq. mi.)
* Standard simulation; compare w/ observations to assess confidence in the model
* Set U.S. or N. American anthropogenic emissions to zero a quantify U.S. background and North American background
* Difference between U.S. background and North American background a Canadian+Mexican pollution enhancement (CANMEX)
(4) Set global anthropogenic emissions to zero a quantify natural background

Data from Fiore et al. [JGR, 2003b] for the period Mar-Oct 2001
Background ozone is important for setting the standard
Background is not directly measurable and needs to be estimated from models

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Tags: background ozone, influences, NASA/GEOS assimilated meteorological data

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