An impact analysis of the surface-cloud coupled effect on TOA reflectivity using a 3D radiative transfer model

Authors: LEIDI WANG*, South China Agricultural University
Topics: Climatology and Meteorology, Remote Sensing
Keywords: three-dimensional radiative transfer, surface-cloud coupled effect, land cover, TOA reflectivity
Session Type: Poster
Day: 4/4/2019
Start / End Time: 8:00 AM / 9:40 AM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded

The I3RC Community Monte Carlo model of three-dimensional (3D) radiative transfer (I3RC-CM) was improved by allowing the user to specify surfaces with a widely used bidirectional reflectance model named RPV (Rahman-Pinty-Verstraete). The surface-cloud coupled effect on top-of-the-atmosphere (TOA) reflectivity (hereinafter, the coupled effect) is evaluated as atmospheric attenuation of incoming shortwave radiation on its way down toward the surface and shortwave radiation reflected at the surface that is transmitted back to the TOA. A series of simulations were performed using the improved I3RC-CM to investigate this effect without considering atmospheric molecules over different land covers, in which land covers are characterized by the three RPV parameters: the intensity of surface reflectance, the anisotropy of the surface, and the asymmetry parameter. The coupled effect on TOA reflectivity can reach to be on the 10-1 order of magnitude. The coupled effect is greatly affected by the land cover, especially the intensity of surface reflectance. The coupled effect strengthens as the surface reflectance intensity and asymmetry parameter increase but slightly weakens as the surface anisotropy increases. Its difference among the surfaces can be greater than 0.30. The land cover change has a stronger impact on the coupled effect at the absorbing wavelengths than at the non-absorbing wavelengths due to the cloud absorption, particularly at 2.13 ┬Ám, but only a small portion of the difference in the coupled effect is contributed by the cloud absorption.

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