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 TROPOMI ALH processing utilizes based on neural network methodology. An example from 10 July 2021 show how ALH (top) compares to the UV Aerosol index (bottom). There good agreement in the broad features for both Saharan desert plumes and smoke plumes over the western United States. Studies are ongoing to further refine and distinguish aerosol layer features from background noise in the measurement.

Data product version summary (click on highlighted version number for the latest PRF).
Version number Version Effective Orbit Number and Date  Summary of Changes
2.04.00 OFFL: orbit 24655, 2022-07-17
NRTI:  orbit 24697, 2022-07-20
Current version; updated L1b 
2.03.01 OFFL: orbit 21188, 2021-11-14
NRTI:  orbit 21223, 2021-11-17
minor format changes
2.02.00 OFFL: orbit 19258, 2021-07-01
NRTI:  orbit 19308, 2021-07-05
updated L1b


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.