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231225s2016 xx |||||o 00| ||eng c |
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|a 10.1002/2016JD025021
|2 doi
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|a eng
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1 |
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|a Wen, Guoyong
|e verfasserin
|4 aut
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|a Testing the Two-Layer Model for Correcting Near Cloud Reflectance Enhancement Using LES/SHDOM Simulated Radiances
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 29.03.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a A transition zone exists between cloudy skies and clear sky, such that clouds scatter solar radiation into clear sky regions. From a satellite perspective, it appears that clouds enhance the radiation nearby. We seek a simple method to estimate this enhancement, since it is so computationally expensive to account for all 3-dimensional (3D) scattering processes. In previous studies, we developed a simple two-layer model (2LM) that estimated the radiation scattered via cloud-molecular interactions. Here we have developed a new model to accounts for cloud-surface interaction (CSI). We test the models by comparing to calculations provided by full 3D radiative transfer simulations of realistic cloud scenes. For these scenes, the MODIS-like radiance fields were computed from the Spherical Harmonic Discrete Ordinate Method (SHDOM), based on a large number of cumulus fields simulated by the UCLA Large Eddy Simulation (LES) model. We find that the original 2LM model that estimates cloud-air molecule interactions accounts for 64% of the total reflectance enhancement, and the new model (2LM+CSI) that also includes cloud-surface interactions accounts for nearly 80%. We discuss the possibility of accounting for cloud-aerosol radiative interactions in 3D cloud induced reflectance enhancement, which may explain the remaining 20% of enhancements. Because these are simple models, these corrections can be applied to global satellite observations (e.g. MODIS) and help to reduce biases in aerosol and other clear-sky retrievals
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|a Journal Article
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|a Marshak, Alexander
|e verfasserin
|4 aut
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| 700 |
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|a Várnai, Tamás
|e verfasserin
|4 aut
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| 700 |
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|a Levy, Robert
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of geophysical research. Atmospheres : JGR
|d 1998
|g 121(2016), 16 vom: 24. Aug., Seite 9661-9674
|w (DE-627)NLM098183494
|x 2169-897X
|7 nnns
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| 773 |
1 |
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|g volume:121
|g year:2016
|g number:16
|g day:24
|g month:08
|g pages:9661-9674
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| 856 |
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|u http://dx.doi.org/10.1002/2016JD025021
|3 Volltext
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|d 121
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