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CALIPSO lidar level 3 aerosol profile product: version 3 algorithm design.

Jason L Tackett^1,2, David M Winker², Brian J Getzewich^1,2

¹Science Systems and Applications, Inc., Hampton, VA, USA.

Atmospheric Measurement Techniques

|January 29, 2021

Summary

This summary is machine-generated.

Quality screening of Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) aerosol data is crucial. Filters significantly reduce biases, leading to more accurate monthly mean aerosol optical depth (AOD) products.

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Area of Science:

Atmospheric Science
Remote Sensing
Aerosol Science

Background:

The CALIPSO satellite provides aerosol extinction profiles globally.
Level 3 products aggregate monthly mean aerosol extinction profiles.
Quality control is essential for reliable aerosol data products.

Purpose of the Study:

To describe the quality screening and averaging methods for the CALIPSO Level 3 aerosol product (version 3).
To evaluate the impact of various quality filters on aerosol extinction profiles and aerosol optical depth (AOD).
To ensure the accuracy of globally gridded, monthly mean aerosol extinction profiles.

Main Methods:

Utilized CALIOP Level 2 aerosol extinction profiles and layer classification data.
Applied a series of quality filters to screen for layer detection, classification, retrieval errors, and surface signal anomalies.
Calculated monthly mean AOD by vertically integrating quality-screened extinction profiles.

Main Results:

The 'extinction QC flag' filter is most effective against high biases in mean extinction.
The 'misclassified cirrus fringe' filter aggressively removes misclassified cirrus clouds.
Quality screening reduced global ocean and land mean AOD by -24% and -31%, respectively.

Conclusions:

Rigorous quality screening is vital for generating accurate CALIPSO Level 3 aerosol products.
The implemented methods successfully mitigate various error sources, improving data reliability.
The quality filters significantly reduce biases in monthly mean AOD, enhancing its scientific utility.