Aerosol optical depth retrieval from the EarthCARE Multi-Spectral Imager: the M-AOT product

The Earth Explorer mission Earth Clouds, Aerosols and Radiation Explorer (EarthCARE) will not only provide profile information on aerosols but also deliver a horizontal context to it through measurements by its Multi-Spectral Imager (MSI). The columnar aerosol product relying on these passive signal...

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Bibliographic Details
Published in:Atmospheric Measurement Techniques
Main Authors: Docter, Nicole, Preusker, Rene, Filipitsch, Florian, Kritten, Lena, Schmidt, Franziska, Fischer, Jürgen
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2023
Subjects:
article
Verlagsveröffentlichung
Aerosol Robotic Network
Online Access:https://doi.org/10.5194/amt-16-3437-2023
https://noa.gwlb.de/receive/cop_mods_00067650
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066099/amt-16-3437-2023.pdf
https://amt.copernicus.org/articles/16/3437/2023/amt-16-3437-2023.pdf
Description
Summary:The Earth Explorer mission Earth Clouds, Aerosols and Radiation Explorer (EarthCARE) will not only provide profile information on aerosols but also deliver a horizontal context to it through measurements by its Multi-Spectral Imager (MSI). The columnar aerosol product relying on these passive signals is called M-AOT (MSI-Aerosol Optical Thickness). Its main parameters are aerosol optical thickness (AOT) at 670 nm over ocean and valid land pixels and at 865 nm over ocean. Here, the algorithm and assumptions behind it are presented. Further, first examples of product parameters are given based on applying the algorithm to simulated EarthCARE test data and Moderate Resolution Imaging Spectroradiometer (MODIS) Level-1 data. Comparisons to input fields used for simulations, to the official MODIS aerosol product, to AErosol RObotic NETwork (AERONET) and to Maritime Aerosol Network (MAN) show an overall reasonable agreement. Over ocean, correlations are 0.98 (simulated scenes), 0.96 (compared to MYD04) and 0.9 (compared to MAN). Over land, correlations are 0.62 (simulated scenes), 0.87 (compared to MYD04) and 0.77 (compared to AERONET). A concluding discussion will focus on future improvements that are necessary and envisioned to enhance the product.

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