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 processing system is based on DOMINO, developed for the OMI NO2 retrieval (see figure). This retrieval-assimilation-modelling system which uses the 3-dimensional global TM5 chemistry transport model as an essential element.
|Version number||Version Effective Date||Summary of Changes|
|1.0.0||6 months post-launch to next update||Post-Phase E1 updates|
|0.11.4||present to 6 months post-launch||First product release|
USER DOCUMENTATION: ATBD, PUM, README, & SAMPLE DATA
The Algorithm Theoretical Basis Document (ATBD) can be found by clicking here and the Product User Manual (PUM) link is located on the right under Documentation. Product README (PRF) and Sample Data Files are being updated based on a new release of the processing software and will be available for download prior to launch.
After launch, preliminary product results will be provided during the Commissioning Phase and the Operational Phase.