Articles | Volume 15, issue 6
Atmos. Meas. Tech., 15, 1703–1728, 2022
https://doi.org/10.5194/amt-15-1703-2022
Atmos. Meas. Tech., 15, 1703–1728, 2022
https://doi.org/10.5194/amt-15-1703-2022
Research article
23 Mar 2022
Research article | 23 Mar 2022

A comparison of the impact of TROPOMI and OMI tropospheric NO2 on global chemical data assimilation

Takashi Sekiya et al.

Data sets

Impacts of Horizontal Reso- lution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis (https://figshare.com/projects/Sekiya_et_ al_2021/126770) Takashi Sekiya, Kazuyuki Miyazaki, Koji Ogochi, Kengo Sudo, Masayuki Takigawa, Henk Eskes, and K. Folkert Boersma https://doi.org/10.1029/2020MS002180

Continuous measurements of general air pollution at ground level National Institute for Environmental Studies (NIES) https://www.nies.go.jp/igreen/

ATom-4 observation data NASA Ames Earth Science Project Office https://espoarchive.nasa.gov/archive/browse/atom/id14/DC8

MCD12C1 MODIS/Terra+Aqua Land Cover Type Yearly L3 Global 0.05Deg CMG (https://earthdata.nasa.gov/) Mark Friedl and Damien Sulla-Menashe https://doi.org/10.5067/MODIS/MCD12C1.006

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Short summary
This study gives a systematic comparison of TROPOMI version 1.2 and OMI QA4ECV tropospheric NO2 column through global chemical data assimilation (DA) integration for April–May 2018. DA performance is controlled by measurement sensitivities, retrieval errors, and coverage. Due to reduced errors in TROPOMI, agreements against assimilated and independent observations were improved by TROPOMI DA compared to OMI DA. These results demonstrate that TROPOMI DA improves global analyses of NO2 and ozone.