Tropomi on Sentinel 5 Precursor: 5 Years Data Record of the Atmospheric Composition for Air Quality, Climate and Ozone Layer Monitoring

<p>Tropomi (Tropospheric Monitoring Instrument) is the payload on board of the European Copernicus Sentinel 5 Precursor satellite, dedicated to atmospheric composition monitoring. Tropomi is an imaging spectrometer developed by The Netherlands in cooperation with ESA, measuring in the UV, visible, near infrared and shortwave infrared, with a spectral resolution in the range of 0.25 to 0.5 nm. The spatial sampling of Tropomi is approximately 3.5 x 5.5 km² for most of the bands and 3.5 x 7.0 km² in the shortwave infrared. The high spatial resolution in combination with the daily global coverage, are key features for the uptake of the Tropomi data for air quality and climate research, as well as for operational applications. The nominal lifetime of the Tropomi mission is 7 years, however there are currently no technical limitations to extent the lifetime many years longer.</p> <p>Tropomi was launched in 2017 and the operational data recors starts in April 2018. All operational data products have recently been reprocessed to provide a 5-year consistent data record. The operational data products include short lived pollutants (NO₂, SO₂, CO, tropospheric O₃ and HCHO), O₃ total column and profiles, greenhouse gases (CH₄ and tropospheric O₃), and cloud and aerosol parameters. Furthermore, there are several research products for additional trace gases (CHOCHO, HONO and OClO), aerosol optical thickness, surface parameters (reflectance and vegetation fluorescence) and ocean color.</p> <p>Tropomi already observed many important events, for example the monitoring of the reduced emissions due to global COVID-19 lockdowns, the discovery of several methane leaks of the oil and gas industry and landfills, the monitoring of the ash cloud of the Hunga Tonga volcanic eruption and the observation of large wildfire plumes from Australia, North and South America, Africa and Siberia.</p> <p>In this contribution we present the current status, achievements and outlook of the Tropomi mission.</p>