Journal article
Combined UV and IR Ozone Profile Retrieval from TROPOMI and CrIS Measurements
Atmospheric measurement techniques, Vol.15(9), pp.2955-2978
05/12/2022
DOI: 10.5194/amt-15-2955-2022
Abstract
Vertical ozone profiles from combined spectral measurements in the ultraviolet and infrared spectral range were retrieved by using data from the TROPOspheric Monitoring Instrument on the Sentinel-5 Precursor (TROPOMI/S5P) and the Cross-track Infrared Sounder on the Suomi National Polar-orbiting Partnership (CrIS/Suomi-NPP), which are flying in loose formation 3 min apart in the same orbit. A previous study of ozone profiles retrieved exclusively from TROPOMI UV spectra showed that the vertical resolution in the troposphere is clearly limited (Mettig et al., 2021). The vertical resolution and the vertical extent of the ozone profiles is improved by combining both wavelength ranges compared to retrievals limited to UV or IR spectral data only. The combined retrieval particularly improves the accuracy of the retrieved tropospheric ozone and to a lesser degree stratospheric ozone up to 30 km. An increase in the degrees of freedom (DOF) by 1 DOF was found in the UV + IR retrieval compared to the UV-only retrieval. Compared to previous publications, which investigated combinations of UV and IR observations from the Ozone Monitoring Instrument and Tropospheric Emission Spectrometer (OMI and TES) and Global Ozone Monitoring Experiment version 2 and Infrared Atmospheric Sounding Interferometer (GOME-2 and IASI) pairs, the degree of freedom is lower, which is attributed to the reduced spectral resolution of CrIS compared to TES or IASI. Tropospheric lidar and ozonesondes were used to validate the ozone profiles and tropospheric ozone content (TOC). In their comparison with tropospheric lidars, both ozone profiles and TOCs show smaller biases for the retrieved data from the combined UV + IR observation than from the UV observations alone. For the ozone profiles below 10 km, the mean differences are around ±10 % and the mean TOC varies around ±3 DU. We show that TOCs from the combined retrieval agree better with ozonesonde results at northern latitudes than the UV-only and IR-only retrievals and also have lower scatter. In the tropics, the IR-only retrieval shows the best agrement with TOCs derived from ozonesondes. While in general the TOCs show good agreement with ozonesonde data, the profiles have a positive bias of around 30 % between 10 and 15 km. The reason is probably a positive stratospheric bias from the IR retrieval. The comparison of the UV + IR and UV ozone profiles up to 30 km with the Microwave Limb Sounder (MLS) demonstrates the improvement of the UV + IR profile in the stratosphere above 18 km. In comparison to the UV-only approach the retrieval shows improvements of up to 10 % depending on latitude but can also show worse results in some regions and latitudes.
Details
- Title: Subtitle
- Combined UV and IR Ozone Profile Retrieval from TROPOMI and CrIS Measurements
- Creators
- Nora Mettig - University of BremenMark Weber - University of BremenAlexei Rozanov - University of BremenJohn P. Burrows - University of BremenPepijn Veefkind - Royal Netherlands Meteorological InstituteAnne M. Thompson - Goddard Space Flight CenterRyan M. Stauffer - Goddard Space Flight CenterThierry Leblanc - Jet Propulsion LaboratoryGerard Ancellet - Laboratoire atmosphères, milieux, observations spatialesMichael J. Newchurch - University of Alabama in HuntsvilleShi Kuang - University of Alabama in HuntsvilleRigel Kivi - Finnish Meteorological InstituteMatthew B. Tully - Bureau of MeteorologyRoeland Van Malderen - Royal Meteorological Institute of BelgiumAnkie Piters - Royal Netherlands Meteorological InstituteBogumil Kois - Institute of Meteorology and Water ManagementRené Stübi - Federal Office of Meteorology and Climatology MeteoSwissPavla Skrivankova - Czech Hydrometeorological InstituteNadia Smith - Science and Technology Corporation (United States)
- Resource Type
- Journal article
- Publication Details
- Atmospheric measurement techniques, Vol.15(9), pp.2955-2978
- Publisher
- Copernicus Publications, European Geosciences Union
- DOI
- 10.5194/amt-15-2955-2022
- ISSN
- 1867-1381
- eISSN
- 1867-8548
- Language
- English
- Date published
- 05/12/2022
- Description audience
- PUBLIC
- Academic Unit
- Iowa Technology Institute
- Record Identifier
- 9984721114702771
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