Tropospheric ozone column retrieved from S5P/TROPOMI total column and BASCOE stratospheric column
Abstract
Sentinel 5 Precursor (S5P) satellite was launched into a polar orbit in October 2017, carrying the TROPOMI instrument. S5P has sun synchronous orbit with an equator crossing time of 13:30 LT. TROPOMI achieves an almost daily coverage, due to the wide swath width of 2600 km. The near-real-time (NRT) ozone total column is based on the two step DOAS approach, consisting of a slant column retrieval and an iterative AMF-calculation. First official TROPOMI data for NRT total ozone columns were released in July 2018 after a successful geophysical validation.
Additional S5P operational ozone products will be released in September/October 2018: the more accurate offline total ozone based on the GODFIT algorithm and the tropical tropospheric ozone based on the convective cloud differential (CCD) method. In this study we present tropospheric ozone columns based on total column from S5P and stratospheric column based on 4D-Var assimilation of Aura MLS ozone profiles. MLS profiles are assimilated by the Belgian Assimilation System for Chemical ObsErvations (BASCOE, Lefever et al., 2015, ACP) and are delivered with a time frequency of 3 hours. BASCOE stratospheric columns are interpolated linearly in time and space to TROPOMI total column locations before subtraction. To avoid potential errors we used only cloud free TROPOMI data. A similar product might be generated in the future by combining TROPOMI data with stratospheric ozone profiles retrieved from OMPS Limb Profiler observations. The method is explained in more detail and the first results are shown and compared to the OMPS tropospheric data and TROPOMI tropical tropospheric ozone column based on the CCD algorithm.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A33J3301L
- Keywords:
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- 3360 Remote sensing;
- ATMOSPHERIC PROCESSESDE: 1640 Remote sensing;
- GLOBAL CHANGEDE: 4337 Remote sensing and disasters;
- NATURAL HAZARDSDE: 8485 Remote sensing of volcanoes;
- VOLCANOLOGY