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- Title
Influence of Cloud Retrieval Errors Due to Three Dimensional Radiative Effects on Calculations of Broadband Cloud Radiative Effect.
- Authors
Ademakinwa, Adeleke S.; Tushar, Zahid H.; Jianyu Zheng; Chenxi Wang; Purushotham, Sanjay; Jianwu Wang; Meyer, Kerry G.; Várnai, Tamas; Zhibo Zhang
- Abstract
We investigate how cloud retrieval errors due to the three-dimensional (3D) radiative effects affect broadband cloud radiative effects (CRE). A framework based on the combination of large eddy simulations (LES) and radiative transfer (RT) models was developed to simulate both one-dimensional (1D) and 3D radiance, and shortwave (SW) broadband fluxes. Results show that the broadband SW fluxes reflected at top-of-the-domain, transmitted at the surface, and absorbed in the atmosphere, computed from the cloud retrievals using 1D-RT (called "1D-RT+retrieved clouds") can provide reasonable broadband radiative energy estimates in comparison with those derived from the true cloud fields using 1D-RT (called "1D-RT+true clouds"). The difference between these 1D-RT simulated fluxes (1D-RT+retrieved clouds simulations, 1D-RT+true clouds simulations) and the benchmark 3D-RT simulations from the true cloud field (called "3D-RT+true clouds"), depends primarily on the horizontal transport of photons in 3D-RT, whose characteristics vary with the Sun's geometry. When the solar zenith angle (SZA) is 5°, the domain-averaged fluxes simulated based on the 1D-RT+retrieved clouds are in excellent agreement with the 3D-RT+true clouds results, all within 7 % relative CRE bias. When the SZA is 60°, the differences between the results from the 1D-RT+retrieved clouds and 3D-RT+true clouds are determined by how the cloud side-illumination and shadowing effects offset each other in the radiance, retrieval, and broadband fluxes. This study suggests that although the cloud property retrievals based on the 1D-RT theory may be biased due to the 3D radiative effects, they still provide an observational basis for the estimation of broadband fluxes.
- Subjects
LARGE eddy simulation models; RADIATION; ZENITH distance; RADIATIVE transfer
- Publication
Atmospheric Chemistry & Physics Discussions, 2023, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/egusphere-2023-2218