The composition of the atmosphere has undergone dramatic changes in the last decades due to human activities. The emissions of nitrogen oxides and hydrocarbons have resulted in an increase of ozone (O3) near the surface and a degradation of air quality on a global scale. Although ozone is a trace gas and constitutes less than 0.001% of the air by volume, it is one of the most important constituents of the atmosphere. The ozone layer in the stratosphere protects the biosphere by absorbing harmful solar ultraviolet (UV) radiation. Downward transport of ozone from the stratosphere contributes to the ozone abundance in the troposphere, but ozone is also produced in the troposphere by sunlight driven chemical reaction cycles, involving NOx, CO, CH4 and other hydrocarbons. This can lead to excessive amounts of ozone near the surface (‘summer smog’), which are toxic to ecosystem, animals, and humans. As such it is important that TROPOMI will be provided a separate data product focusing on the concentration of tropospheric ozone. There are many techniques that can be employed including the merged product based on both OMI and GOME-2 data shown for a single day and available at temis.nl.
|Version number||Version Effective Date||Summary of Changes|
|1.0.0||6 months post-launch to next update||Post-Phase E1 updates|
|0.11.04||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.