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 now operational TROPOMI ALH processor is based on neural network methodology, an example is shown in the figure below, from the California fires on 12 Dec 2017, with retrieved aerosol optical depth (left) and retrieved layer height in pressure units (right).

Data product version summary (click on highlighted version number for the latest PRF).
Version number Version Effective Orbit Number and Date  Summary of Changes
1.04.00 OFFL: orbit 16213, 2020-11-29
NRTI:  orbit 16259, 2020-12-02
Current version
1.03.02 OFFL: orbit 8815, 2019-06-26
NRTI:  orbit 10171, 2020-09-30
NRTI released
1.03.01 OFFL: orbit 7907, 2019-04-23
RPRO:  orbit 2818, 2018-04-30
No algorithm changes


Links to the Product Readme File (PRF), Algorithm Theoretical Basis Document (ATBD), and the Product User Manual (PUM) are located on the right of this page under Documentation. This data was made publicly available in September 2019 and is accessible via the Copernicus Data Hub.