TY - GEN
T1 - Improved atmospheric 3D BSDF model in earthlike exoplanet using ray-tracing based method
AU - Ryu, Dongok
AU - Kim, Sug Whan
AU - Seong, Sehyun
PY - 2012/12/1
Y1 - 2012/12/1
N2 - The studies on planetary radiative transfer computation have become important elements to disk-averaged spec- tral 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 com- puted as they experience reection, 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.
AB - The studies on planetary radiative transfer computation have become important elements to disk-averaged spec- tral 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 com- puted as they experience reection, 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.
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U2 - 10.1117/12.930260
DO - 10.1117/12.930260
M3 - Conference contribution
AN - SCOPUS:84872802838
SN - 9780819492388
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Instruments, Methods, and Missions for Astrobiology XV
T2 - Instruments, Methods, and Missions for Astrobiology XV
Y2 - 14 August 2012 through 15 August 2012
ER -