Publication Abstracts
Alexandrov et al. 2024
, , C. Emde, and B. Van Diedenhoven, 2024: Correction of cloud optical thickness retrievals from nadir reflectances in the presence of 3D radiative effects. Part I: Concept and tests on 3D RT simulations. Front. Remote Sens., 5, 1397631, doi:10.3389/frsen.2024.1397631.
3D effects cause substantial underestimation of cloud optical thickness (COT) in airborne and satellite retrievals based on 1D radiative transfer computations (such as in the case of widely used bispectral technique). For a single-layer isolated cloud we propose a simple linear correction of the retrieved COT with the renormalization factor dependent on the cloud's aspect ratio (the ratio between vertical and horizontal dimensions of the cloud). This is an empirical assumption which we successfully test using synthetic 3D RT data. We introduce a heuristic "block model" of 3D radiative effects and show that the functional form of the renormalization factor is consistent with the process of radiation escape from cloud sides in an essentially 3D geometry. We also extend the block model to the case of single-layer broken cloud field with radiative interaction between the neighboring clouds. In this case the renormalization factor depends also on the distance between clouds.
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BibTeX Citation
@article{al01800d,
author={Alexandrov, M. D. and Cairns, B. and Emde, C. and Van Diedenhoven, B.},
title={Correction of cloud optical thickness retrievals from nadir reflectances in the presence of 3D radiative effects. Part I: Concept and tests on 3D RT simulations},
year={2024},
journal={Frontiers in Remote Sensing},
volume={5},
pages={1397631},
doi={10.3389/frsen.2024.1397631},
}
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RIS Citation
TY - JOUR ID - al01800d AU - Alexandrov, M. D. AU - Cairns, B. AU - Emde, C. AU - Van Diedenhoven, B. PY - 2024 TI - Correction of cloud optical thickness retrievals from nadir reflectances in the presence of 3D radiative effects. Part I: Concept and tests on 3D RT simulations JA - Front. Remote Sens. JO - Frontiers in Remote Sensing VL - 5 SP - 1397631 DO - 10.3389/frsen.2024.1397631 ER -
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