15A.3 Evaluation and Interpretation of NO2 Measurements during the DISCOVER-AQ and KORUS-AQ Field Campaigns

Thursday, 16 January 2020: 4:00 PM
206B (Boston Convention and Exhibition Center)
S. Choi, SSAI, Lanham, MD; NASA GSFC, Greenbelt, MD; and L. N. Lamsal, J. Joiner, N. A. Krotkov, M. B. Follette-Cook, W. H. Swartz, C. P. Loughner, W. Appel, G. Pfister, P. E. Saide, R. C. Cohen, A. J. Weinheimer, and K. E. Pickering

Nitrogen dioxide (NO2) is an important trace species in the troposphere; it has adverse human health effects and also contributes to the formation of tropospheric ozone, a criteria pollutant, and climate agent. Various types of NO2 measurements were made during DISCOVER-AQ and KORUS-AQ field campaigns, including ground-based surface and airborne in-situ NO2 mixing ratio, ground-based Pandora total column, and Ozone Monitoring Instrument (OMI) tropospheric column. We conduct a comprehensive analysis of these measurements. NO2 vertical profiles and columns are obtained from in-situ/ground-based measurements. OMI tropospheric column NO2 is adjusted by two methods for a more accurate retrieval of tropospheric NO2 abundances specifically for the campaigns. First, using high-resolution Community Multi-scale Air Quality (CMAQ) model simulations, the spatially coarse OMI NO2 pixels are downscaled into a finer spatial grid for comparisons with in-situ/ground-based measurements capturing small-scale features. Second, we utilize the profiles from the in-situ measurements during the campaigns as a priori profiles in the tropospheric air mass factor (AMF) calculation. We analyze the tropospheric NO2 columns from OMI and in-situ/ground-based measurements to evaluate OMI NO2 column measurement and to investigate the effects of accuracy of a priori profiles in the OMI NO2 column retrieval.
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