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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 9 | Copyright

Special issue: Ten years of Ozone Monitoring Instrument (OMI) observations...

Atmos. Meas. Tech., 10, 3133-3149, 2017
https://doi.org/10.5194/amt-10-3133-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Sep 2017

Research article | 01 Sep 2017

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, Mark Wenig6, and Marina Zara7 Nickolay A. Krotkov et al.
  • 1Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 2GESTAR, Universities Space Research Association, Columbia, Maryland, USA
  • 3Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USA
  • 4Science Systems and Applications, Inc., Lanham, Maryland, USA
  • 5SRI International, Menlo Park, California, USA
  • 6Department of Physics, Ludwig Maximilian University, Munich, Germany
  • 7Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands

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/datasets/OMNO2_V003/summary/). The major improvements include (1) a new spectral fitting algorithm for NO2 slant column density (SCD) retrieval and (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 shows that the new SPv3 products agree better with independent satellite- and ground-based Fourier transform infrared (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 hot spots.

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We describe the new version 3 OMI NO2 standard product (SPv3) 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 (SPv3) based on significant improvements...
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