Improved atmospheric 3D BSDF model in earthlike exoplanet using ray-tracing based method

Dongok Ryu; Sug-Whan Kim; Sehyun Seong

doi:10.1117/12.930260

15 October 2012 Improved atmospheric 3D BSDF model in earthlike exoplanet using ray-tracing based method

Dongok Ryu, Sug-Whan Kim, Sehyun Seong

Proceedings Volume 8521, Instruments, Methods, and Missions for Astrobiology XV; 85210F (2012) https://doi.org/10.1117/12.930260
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

The studies on planetary radiative transfer computation have become important elements to disk-averaged spectral characterization of potential exoplanets. In this paper, we report an improved ray-tracing based atmospheric simulation model as a part of 3-D earth-like planet model with 3 principle sub-components i.e. land, sea and atmosphere. Any changes in ray paths and their characteristics such as radiative power and direction are computed as they experience reflection, refraction, transmission, absorption and scattering. Improved atmospheric BSDF algorithms uses Q.Liu's combined Rayleigh and aerosol Henrey-Greenstein scattering phase function. The input cloud-free atmosphere model consists of 48 layers with vertical absorption profiles and a scattering layer with their input characteristics using the GIOVANNI database. Total Solar Irradiance data are obtained from Solar Radiation and Climate Experiment (SORCE) mission. Using aerosol scattering computation, we first tested the atmospheric scattering effects with imaging simulation with HRIV, EPOXI. Then we examined the computational validity of atmospheric model with the measurements of global, direct and diffuse radiation taken from NREL(National Renewable Energy Laboratory)s pyranometers and pyrheliometers on a ground station for cases of single incident angle and for simultaneous multiple incident angles of the solar beam.

Citation Download Citation

Dongok Ryu, Sug-Whan Kim, and Sehyun Seong "Improved atmospheric 3D BSDF model in earthlike exoplanet using ray-tracing based method", Proc. SPIE 8521, Instruments, Methods, and Missions for Astrobiology XV, 85210F (15 October 2012); https://doi.org/10.1117/12.930260

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