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A variant of the limb–nadir matching technique for deriving troposphericNO2 columns is presented in which the stratospheric component of theNO2 slant column density (SCD) measured by the Ozone MonitoringInstrument (OMI) is removed using non-coincident profiles from the OpticalSpectrograph and InfraRed Imaging System (OSIRIS). In order to correct theirmismatch in local time and the diurnal variation of stratospheric NO2,OSIRIS profiles, which were measured just after sunrise, were mapped to thelocal time of OMI observations using a photochemical box model. Following theprofile time adjustment, OSIRIS NO2 stratospheric vertical columndensities (VCDs) were calculated. For profiles that did not reach down to thetropopause, VCDs were adjusted using the photochemical model. Using air massfactors from the OMI Standard Product (SP), a new tropospheric NO2 VCD product – referred to as OMI-minus-OSIRIS (OmO) – was generated throughlimb–nadir matching. To accomplish this, the OMI total SCDs were scaled usingcorrection factors derived from the next-generation SCDs that improve uponthe spectral fitting used for the current operational products. One year,2008, of OmO was generated for 60° S to 60° N and a cursoryevaluation was performed. The OmO product was found to capture the mainfeatures of tropospheric NO2, including a background value of about0.3 × 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–nadirmatching approach is feasible for the removal of stratospheric NO2measured by a polar orbiter from a nadir-viewing instrument in ageostationary orbit such as Tropospheric Emissions: Monitoring of Pollution(TEMPO) or Sentinel-4

atmospheric measurement techniques

Limb–nadir matching using non-coincident NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; observations: proof of concept and the OMI-minus-OSIRIS prototype product