Aerosol Optical Thickness Retrieval in Presence of Cloud: Application to S3A/SLSTR Observations
Abstract
:1. Introduction
2. Data and Method
2.1. The SLSTR Instrument
- If the 80% of sub-pixels are cloud-free, only cloud-free observations are aggregated and the cloud mask is set to 0.
- If the 80% of sub-pixels are cloudy, only cloudy observations are aggregated and the cloud mask is set to 1.
- Otherwise, all pixels are aggregated and the cloud mask is a number between 0 and 1, indicating the percentage of cloudy pixels.
2.2. The CISAR Algorithm
2.2.1. CISAR Atmospheric Solution Space
2.2.2. Prior Information
Cloud Phase and Optical Thickness
Spatial Constraints on AOT
Surface Parameters Climatology
2.3. Inversion
2.3.1. SLSTR Data Accumulation
2.3.2. Data Processing
Processing over Land
Processing over Water
- 1.
- Clear sky if TOA BRF in band S6 lower than 0.01;
- 2.
- Cloudy if TOA BRF in band S6 larger than 0.2;
- 3.
- Undefined otherwise.
3. Case Study: The Godzilla Dust Storm
4. Discussion
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Band | Central Wavelength (m) |
---|---|
S1 | 0.554 |
S2 | 0.659 |
S3 | 0.868 |
S4 | 1.374 |
S5 | 1.613 |
S6 | 2.225 |
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Luffarelli, M.; Govaerts, Y.; Franceschini, L. Aerosol Optical Thickness Retrieval in Presence of Cloud: Application to S3A/SLSTR Observations. Atmosphere 2022, 13, 691. https://doi.org/10.3390/atmos13050691
Luffarelli M, Govaerts Y, Franceschini L. Aerosol Optical Thickness Retrieval in Presence of Cloud: Application to S3A/SLSTR Observations. Atmosphere. 2022; 13(5):691. https://doi.org/10.3390/atmos13050691
Chicago/Turabian StyleLuffarelli, Marta, Yves Govaerts, and Lucio Franceschini. 2022. "Aerosol Optical Thickness Retrieval in Presence of Cloud: Application to S3A/SLSTR Observations" Atmosphere 13, no. 5: 691. https://doi.org/10.3390/atmos13050691
APA StyleLuffarelli, M., Govaerts, Y., & Franceschini, L. (2022). Aerosol Optical Thickness Retrieval in Presence of Cloud: Application to S3A/SLSTR Observations. Atmosphere, 13(5), 691. https://doi.org/10.3390/atmos13050691