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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-44
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 Mar 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.
The version 3 OMI NO2 standard product
Nickolay A. Krotkov1, Lok N. Lamsal2,1, Edward A. Celarier2,1, William H. Swartz3,1, Sergey V. Marchenko4,1, Eric J. Bucsela5, Ka Lok Chan6, and Mark Wenig6 1Atmospheric Chemistry and Dynamics Laboratory, Goddard Space Fl ight Center, Greenbelt, MD, US
2GESTAR, Universities Space Research Association, Columbia, Maryland, US
3Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, US
4Science Systems and Applications, Inc., Lanham, Maryland, US
5SRI International, Menlo Park, California, US
6Department of Physics, Ludwig - Maximilians - University, Munich, Germany
Abstract. We describe the new, version 3.0 NASA Ozone Monitoring Instrument (OMI) standard nitrogen dioxide (NO2) products (SPv3). The products and documentation are publicly available from the NASA Goddard Earth Sciences Data and Information Services Center (https://disc.gsfc.nasa.gov/uui/datasets/OMNO2_V003/summary). The major improvements include: (1) new spectral fitting algorithm for NO2 slant column density (SCD) retrieval; (2) higher resolution (1° latitude and 1.25° longitude) a priori NO2 and temperature profiles from the Global Modeling Initiative (GMI) chemistry-transport model with yearly varying emissions to calculate air-mass factors (AMFs) required to convert SCDs into vertical column densities (VCDs). The new SCDs are systematically lower (by ~ 10 %–40 %) than previous, version 2, estimates. Most of this reduction in SCDs is propagated into stratospheric VCDs. Tropospheric NO2 VCDs are also reduced over polluted areas, especially over Western Europe, the eastern US and eastern China. Initial evaluation over unpolluted areas has shown that the new SPv3 products agree better with independent satellite and ground based FTIR measurements. However, further evaluation of tropospheric VCDs is needed over polluted areas, where the increased spatial resolution and more refined AMF estimates may lead to better characterization of pollution hotspots.

Citation: Krotkov, N. A., Lamsal, L. N., Celarier, E. A., Swartz, W. H., Marchenko, S. V., Bucsela, E. J., Chan, K. L., and Wenig, M.: The version 3 OMI NO2 standard product, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-44, in review, 2017.
Nickolay A. Krotkov et al.
Nickolay A. Krotkov et al.
Nickolay A. Krotkov et al.

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Short summary
We describe the new, Version 3 OMI NO2 Standard Product based on significant improvements in both the estimation of the SCDs and the AMFs. The new SCDs and stratospheric VCDs are systematically lower (by ~ 10 %–40 %) than previous estimates. Tropospheric VCDs are also reduced over polluted areas. Initial evaluation over unpolluted areas has shown that the new SPv3 products agree better with independent satellite and ground based FTIR measurements.
We describe the new, Version 3 OMI NO2 Standard Product based on significant improvements in...
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