JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS01] [EE] 3D Cloud Modeling as a Tool for 3D Radiative Transfer, and Conversely

Sun. May 21, 2017 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Thomas Fauchez(Universities Space Research Association, GSFC Greenbelt), Anthony B Davis(Jet Propulsion Laboratory), Hironobu Iwabuchi(Graduate School of Science, Tohoku University), Kentaroh Suzuki(Atmosphere and Ocean Research Institute, University of Tokyo)

[AAS01-P08] Variational Iteration Method for Infrared Radiative Transfer in a Scattering Medium

*Feng Zhang1,2, Yi-Ning Shi2, Jiangnan Li3, Kun Wu2, Hironobu Iwabuchi1 (1.Tohoku University, 2.Nanjing University of Information Science and Technology, 3.Canadian Center for Climate Modeling and Analysis, University of Victoria)

Keywords:Variational Iteration Method, Radiative Transfer, Absorption Approximation

A new scheme is proposed for using the variational iteration method (VIM) to solve the problem of infrared radiative transfer in a scattering medium. This scheme allows the zeroth-order solution to be identied as the absorption approximation and the scattering effect is included in the first-order iteration. The upward and downward intensities are calculated separately in the VIM, which simplies the calculation process. By applying the VIM scheme to two single-layer scattering media and a full radiation algorithm with gaseous transmission, it is found that the VIM is generally more accurate than the discrete-ordinates method (DOM), especially for cirrostratus. Computationally, the VIM is slightly faster than the DOM in the two-stream case but more than twice as fast in the four-stream case. In view of its high overall accuracy and computational efficiency, the VIM is well suited to solving infrared radiative transfer in climate models.