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Dependence of ozone sensitivity analysis on grid resolution [An article from: Atmospheric Environment]
Book Details
Author(s)D.S. Cohan, Y. Hu, A.G. Russell
PublisherElsevier
ISBN / ASINB000P6O1JA
ISBN-13978B000P6O1J5
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
We examine the extent to which the sensitivity of ground-level ozone concentrations to precursor emissions varies with grid resolution in a regional air quality model. Nested grids of 36-, 12- and 4-km resolution are applied to model an air pollution episode in Georgia. A direct sensitivity analysis method is used to compute the response of ozone to emissions of its precursors, nitrogen oxides (NO"x) and volatile organic compounds (VOCs). All three grids predict that ozone production is limited primarily by the availability of NO"x, and yield similar predictions of average ozone sensitivity to both regional and local emissions of NO"x. However, in urban areas, the coarsest (36-km) resolution fails to capture the extent and magnitude of VOC sensitivity and underpredicts the nonlinearity of ozone response indicated by the finest resolution. Medium (12-km) resolution is sufficient to reproduce most features of ozone response, except for the texture of local variability. Despite the consistency of average results, discrepancies in wind fields at times lead to inconsistencies in the predicted location of ozone enhancements, especially for a power plant plume.
Description:
We examine the extent to which the sensitivity of ground-level ozone concentrations to precursor emissions varies with grid resolution in a regional air quality model. Nested grids of 36-, 12- and 4-km resolution are applied to model an air pollution episode in Georgia. A direct sensitivity analysis method is used to compute the response of ozone to emissions of its precursors, nitrogen oxides (NO"x) and volatile organic compounds (VOCs). All three grids predict that ozone production is limited primarily by the availability of NO"x, and yield similar predictions of average ozone sensitivity to both regional and local emissions of NO"x. However, in urban areas, the coarsest (36-km) resolution fails to capture the extent and magnitude of VOC sensitivity and underpredicts the nonlinearity of ozone response indicated by the finest resolution. Medium (12-km) resolution is sufficient to reproduce most features of ozone response, except for the texture of local variability. Despite the consistency of average results, discrepancies in wind fields at times lead to inconsistencies in the predicted location of ozone enhancements, especially for a power plant plume.
