4A.4 Evaluation of Surface Ozone Chemistry in Regulatory Air Quality Models through the Use of OMI Observations and Ground-Based Data

Tuesday, 9 January 2018: 9:15 AM
Room 18CD (ACC) (Austin, Texas)
Timothy P. Canty, Univ. of Maryland, College Park, MD; and A. M. Ring, M. R. Marvin, S. J. Roberts, L. Hembeck, G. M. Wolfe, R. J. Salawitch, and R. R. Dickerson

Determining the chemical conditions that lead to the formation of surface ozone, a pollutant regulated by the federal government, is of great interest to scientists and policy makers. The lack of detailed observations of ozone precursors, such as NOx and volatile organic compounds (VOCs), limits our ability to precisely identify the non-linear chemistry that determines ozone production over large regions of the United States. Earlier studies have used the ratio of satellite observations of column HCHO, a VOC proxy, to column NO2 to estimate ozone sensitivity. Recent work has highlighted the regional and temporal variations of this ratio that must be accounted for. This analysis focuses on the ratio of column HCHO/NO2 as observed from space and representation of this quantity in regulatory air quality models using a number of assumptions regarding the model framework. The use of this ratio as a proxy for the sensitivity of surface ozone to photochemical regime and as a prognosticator of future changes in surface ozone, is investigated.
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