Data products

Nitrogen Dioxide

Notification to all S5P/TROPOMI NO2 data users: 

An upgrade in the NO2 processing (version 01.04.00) with improved handling of cloud pressure has been implemented on 2 December 2020 starting with orbit 16259. As a result, we expect an offset to be introduced in the tropospheric NO2 column record starting from this day. In general, we expect to see larger values over polluted regions as compared to version 01.03.02. Any users analyzing trends in TROPOMI NO2 data should use caution when comparing data from periods before and after this switch. This data record offset will be rectified once the reprocessed data series is made available. For a more detailed description please refer to the NO2 Product Readme File (PRF) and check out this link for an overview and access to sample data.  

 

DESCRIPTION

Nitrogen dioxide (NO2) and nitrogen oxide (NO) together are usually referred to as nitrogen oxides (NOx = NO + NO2). They are important trace gases in the Earth’s atmosphere, present in both the troposphere and the stratosphere. They enter the atmosphere as a result of anthropogenic activities (notably fossil fuel combustion and biomass burning) and natural processes (such as microbiological processes in soils, wildfires and lightning). During daytime, i.e. in the presence of sunlight, a photochemical cycle involving ozone (O3) converts NO into NO2 (and vice versa) on a timescale of minutes, so that NO2 is a robust measure for concentrations of nitrogen oxides. Tropospheric and stratospheric concentrations of NO2 are monitored all over the world by a variety of instruments either ground-based, in-situ (balloon, aircraft), or satellite-based– each with its own specific advantages. The TROPOMI NO2 (see figure) processing system is based on the algorithm developments for the DOMINO-2 product and for the EU QA4ECV NO2 reprocessed dataset for OMI, and has been adapted for TROPOMI. This retrieval-assimilation-modelling system uses the 3-dimensional global TM5-MP chemistry transport model at a resolution of 1x1 degree as an essential element (see ATBD for details). 

Data product version summary (click the highlighted version number for latest PRF).

Version number Version Effective Date Summary of Changes

1.04.00

OFFL: orbit 16213, 2020-11-29
NRTI:  orbit 16259, 2020-12-02

Current version, cloud pressure

scheme is updated

1.03.02

OFFL: orbit 8815, 2019-06-26
NRTI:  orbit 8906, 2019-07-03

 

1.03.01 OFFL: orbit 7907, 2019-04-23
NRTI:  orbit 8000, 2019-04-30
No algorithm changes

 

USER DOCUMENTATION: ATBD, PUM, & README

Links to the Algorithm Theoretical Basis Document (ATBD), Product User Manual (PUM), and the Product Readme File (PRF) is provided here on the right under Documentation. Note: both the NRTI and the OFFL versions of this data product were publically released on 11 July 2018 and are available via the Copernicus Open Data Access Hub (see link on right).