Data products

Aerosol Layer Height


The TROPOMI Aerosol Layer Height (ALH) product focuses on retrieval of vertically localized aerosol layers in the free troposphere, such as desert dust, biomass burning aerosol, or volcanic ash plumes in layers for cloud-free scenes. Applications include radiative forcing studies, long-range transport modeling and studies of cloud formation processes, and are of use for aviation safety. Retrieval of aerosol height is based on absorption in the O2 A band in the near-infrared wavelength range (759 and 770 nm). The figure below is from the KNMI UV Lidar at Cabauw, NL that captured a volcanic aerosol plume on 18 April 2010. It is anticipated the TROPOMI ALH data product will retrieve mid-pressure layer heights for this type of plumes.

UV Lidar image volcanic plume

Data product version summary (click version number for latest Product Readme).
Version number Version Effective Date Summary of Changes
2.0.0 6-June-2018 to present Cloud flagging improved
1.0.0 20-Aug-2017 to 5-June-2018 First product release



The Algorithm Theoretical Basis Document (ATBD) can be found by clicking here.The Product User Manual (PUM) and Sample Data Files are being updated based on a new release of the processing software and will be available for download by mid-May 2017.

After launch, preliminary product results will be provided during the Commissioning Phase and the Operational Phase.