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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-248
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Research article 10 Aug 2018

Research article | 10 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Evaluation of version 3.0B of the BEHR OMI NO2 product

Joshua L. Laughner1, Qindan Zhu2, and Ronald Cohen1,2 Joshua L. Laughner et al.
  • 1Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
  • 2Department of Earth and Planetary Sciences, University of California, Berkeley, Berkeley, CA 94720

Abstract. Version 3.0B of the Berkeley High Resolution (BEHR) OMI NO2 product is designed to accurately retrieve daily variation in the high spatial resolution mapping of tropospheric column NO2. To assess the product, we compare against in situ aircraft profiles and Pandora vertical column densities (VCDs). We also compare the WRF-Chem simulation used to generate the a priori NO2 profiles against observations. We find that using daily NO2 profiles improves the VCDs retrieved in urban areas relative to low resolution or monthly a priori by amounts that are large compared to current uncertainties in NOx emissions and chemistry (of order 10% to 30%). Based on this analysis, we offer suggestions to consider when designing retrieval algorithms and validation procedures for upcoming geostationary satellites.

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Joshua L. Laughner et al.
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Joshua L. Laughner et al.
Data sets

Berkeley High Resolution (BEHR) OMI NO2 - Gridded pixels, daily profiles, v3 J. L. Laughner, Q. Zhu, and R. C. Cohen https://doi.org/10.6078/D12D5X

Berkeley High Resolution (BEHR) OMI NO2 - Native pixels, daily profiles J. L. Laughner, Q. Zhu, and R. C. Cohen https://doi.org/10.6078/D1WH41

Berkeley High Resolution (BEHR) OMI NO2 - Gridded pixels, monthly profiles J. L. Laughner, Q. Zhu, and R. C. Cohen https://doi.org/10.6078/D1RQ3G

Berkeley High Resolution (BEHR) OMI NO2 - Native pixels, monthly profiles J. L. Laughner, Q. Zhu, and R. C. Cohen https://doi.org/10.6078/D1N086

Supporting data for “Evaluation of version 3.0B of the BEHR OMI NO2 product” J. L. Laughner, Q. Zhu, and R. C. Cohen https://doi.org/10.6078/D1JT28

Model code and software

CohenBerkeleyLab/BEHR-Core: BEHR Core code J. L. Laughner and Q. Zhu https://doi.org/10.5281/zenodo.998275

Analysis code for Laughner et al., AMT (discussion) J. L. Laughner https://doi.org/10.5281/zenodo.1320469

Joshua L. Laughner et al.
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Short summary
We compared v3.0B of the BEHR satellite NO2 product against independent measurements to verify its accuracy. We found that the BEHR product generally performs better than standard NO2 products and the previous version of BEHR. Outside of the SE US, using daily NO2 profiles results in similar or better agreement to independent measurements than using monthly profiles, and direct evaluation of those profiles shows they better describe NO2 distribution in urban areas than monthly profiles.
We compared v3.0B of the BEHR satellite NO2 product against independent measurements to verify...
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