Estimating surface NO2 and SO2 mixing ratios from fast-response total column observations and potential application to geostationary missions

Total-column nitrogen dioxide (NO2) data collected by a ground-based sun-tracking spectrometer system (Pandora) and an photolytic-converter-based in-situ instrument collocated at NASA's Langley Research Center in Hampton, Virginia were analyzed to study the relationship between total-column and surface NO2 measurements. The measurements span more than a year and cover all seasons. Surface mixing ratios are estimated via application of a planetary boundary-layer (PBL) height correction factor. This PBL correction factor effectively corrects for boundary-layer variability throughout the day, and accounts for up to a parts per thousand 75 % of the variability between the NO2 data sets. Previous studies have made monthly and seasonal comparisons of column/surface data, which has shown generally good agreement over these long average times. In the current analysis comparisons of column densities averaged over 90 s and 1 h are made. Applicability of this technique to sulfur dioxide (SO2) is briefly explored. The SO2 correlation is improved by excluding conditions where surface levels are considered background. The analysis is extended to data from the July 2011 DISCOVER-AQ mission over the greater Baltimore, MD area to examine the method's performance in more-polluted urban conditions where NO2 concentrations are typically much higher.

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Author Knepp, T.
Pippin, M.
Crawford, J.
Chen, G.
Szykman, J.
Long, R.
Cowen, L.
Cede, A.
Abuhassan, N.
Herman, J.
Delgado, R.
Compton, J.
Berkoff, T.
Fishman, J.
Martins, D.
Stauffer, R.
Thompson, A.
Weinheimer, Andrew ORCID icon
Knapp, David
Montzka, Denise D. ORCID icon
Lenschow, Donald H. ORCID icon
Neil, D.
Publisher UCAR/NCAR - Library

Publication Date 2015-09-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-12-26T03:03:24.500555
Metadata Record Identifier edu.ucar.opensky::articles:13348
Metadata Language eng; USA
Suggested Citation Knepp, T., Pippin, M., Crawford, J., Chen, G., Szykman, J., Long, R., Cowen, L., Cede, A., Abuhassan, N., Herman, J., Delgado, R., Compton, J., Berkoff, T., Fishman, J., Martins, D., Stauffer, R., Thompson, A., Weinheimer, Andrew, Knapp, David, Montzka, Denise D., Lenschow, Donald H., Neil, D.. (2015). Estimating surface NO2 and SO2 mixing ratios from fast-response total column observations and potential application to geostationary missions. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d72b8zzc. Accessed 06 March 2026.

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