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Volume 9, issue 8
Atmos. Meas. Tech., 9, 4103–4122, 2016
https://doi.org/10.5194/amt-9-4103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

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

Atmos. Meas. Tech., 9, 4103–4122, 2016
https://doi.org/10.5194/amt-9-4103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Aug 2016

Research article | 26 Aug 2016

Limb–nadir matching using non-coincident NO2 observations: proof of concept and the OMI-minus-OSIRIS prototype product

Cristen Adams1,2, Elise N. Normand1, Chris A. McLinden3, Adam E. Bourassa1, Nicholas D. Lloyd1, Douglas A. Degenstein1, Nickolay A. Krotkov4, Maria Belmonte Rivas5, K. Folkert Boersma5,6, and Henk Eskes5 Cristen Adams et al.
  • 1Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 2Alberta Environmental Monitoring and Science Division, Alberta Environment and Parks, Edmonton, Canada
  • 3Air Quality Research Division, Environment Canada, Toronto, Ontario, Canada
  • 4NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 5Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
  • 6Wageningen University, Meteorology and Air Quality Group, Wageningen, the Netherlands

Abstract. A variant of the limb–nadir matching technique for deriving tropospheric NO2 columns is presented in which the stratospheric component of the NO2 slant column density (SCD) measured by the Ozone Monitoring Instrument (OMI) is removed using non-coincident profiles from the Optical Spectrograph and InfraRed Imaging System (OSIRIS). In order to correct their mismatch in local time and the diurnal variation of stratospheric NO2, OSIRIS profiles, which were measured just after sunrise, were mapped to the local time of OMI observations using a photochemical box model. Following the profile time adjustment, OSIRIS NO2 stratospheric vertical column densities (VCDs) were calculated. For profiles that did not reach down to the tropopause, VCDs were adjusted using the photochemical model. Using air mass factors from the OMI Standard Product (SP), a new tropospheric NO2 VCD product – referred to as OMI-minus-OSIRIS (OmO) – was generated through limb–nadir matching. To accomplish this, the OMI total SCDs were scaled using correction factors derived from the next-generation SCDs that improve upon the spectral fitting used for the current operational products. One year, 2008, of OmO was generated for 60° S to 60° N and a cursory evaluation was performed. The OmO product was found to capture the main features of tropospheric NO2, including a background value of about 0.3 × 1015 molecules cm−2 over the tropical Pacific and values comparable to the OMI operational products over anthropogenic source areas. While additional study is required, these results suggest that a limb–nadir matching approach is feasible for the removal of stratospheric NO2 measured by a polar orbiter from a nadir-viewing instrument in a geostationary orbit such as Tropospheric Emissions: Monitoring of Pollution (TEMPO) or Sentinel-4.

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A new "OMI-minus-OSIRIS" (OmO) prototype dataset for tropospheric NO2 was created by combining information from the OMI satellite instrument, which is sensitive to NO2 in both the troposphere and stratosphere, with information from the OSIRIS satellite instrument, which measures NO2 in the stratosphere. This paper demonstrates that this approach is feasible and could be applied to future geostationary missions.
A new "OMI-minus-OSIRIS" (OmO) prototype dataset for tropospheric NO2 was created by combining...
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