TY - JOUR

T1 - Monte Carlo Method for Numerical Simulation of Solar Energy Radiation Transfer in Crystal Clouds

AU - Kargin, B. A.

AU - Kablukova, E. G.

AU - Mu, Q.

AU - Prigarin, S. M.

N1 - The work was performed with the financial support of the RSF grant (project no. 23-27-00345, E.G. Kablukova and S.M. Prigarin being responsible for calculating radiation transfer in optically anisotropic clouds) and the state assignment to the IMG SR RAS (project FWNM-2022-0002, B.A. Kargin being responsible for calculating the scattering phase functions and development and testing of the new radiation transfer algorithm).

PY - 2024/6

Y1 - 2024/6

N2 - Abstract: The paper deals with numerical simulations related to radiation transfer in ice clouds. A mathematical model of crystal particles of irregular shape and an algorithm for modeling such particles based on constructing a convex hull of a set of random points are considered. Two approaches to simulating radiation transfer in optically anisotropic clouds are studied. One approach uses pre-calculated scattering phase functions for crystals of various shapes and orientations. In the other approach, no knowledge of phase functions is required; the radiation scattering angle is simulated directly at interaction of a photon with faces of crystal. This approach enables simple adjustment of the input parameters of the problem to changing microphysical characteristics of the environment, including the shape, orientation, and transparency of particles and roughness of their boundaries, and does not require time-consuming pre-calculations. The impact of flutter on the radiation transfer by the cloud layer and angular distributions of the reflected and transmitted radiation are studied.

AB - Abstract: The paper deals with numerical simulations related to radiation transfer in ice clouds. A mathematical model of crystal particles of irregular shape and an algorithm for modeling such particles based on constructing a convex hull of a set of random points are considered. Two approaches to simulating radiation transfer in optically anisotropic clouds are studied. One approach uses pre-calculated scattering phase functions for crystals of various shapes and orientations. In the other approach, no knowledge of phase functions is required; the radiation scattering angle is simulated directly at interaction of a photon with faces of crystal. This approach enables simple adjustment of the input parameters of the problem to changing microphysical characteristics of the environment, including the shape, orientation, and transparency of particles and roughness of their boundaries, and does not require time-consuming pre-calculations. The impact of flutter on the radiation transfer by the cloud layer and angular distributions of the reflected and transmitted radiation are studied.

KW - Monte Carlo method

KW - cirrus clouds

KW - geometrical optics

KW - radiation transfer

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85195134646&origin=inward&txGid=060ff4ce2b7564945fc2a20fe0898b52

UR - https://www.mendeley.com/catalogue/56a95be0-8b7d-3da8-9ca7-f8d0959f50ed/

U2 - 10.1134/S1995423924020046

DO - 10.1134/S1995423924020046

M3 - Article

VL - 17

SP - 140

EP - 151

JO - Numerical Analysis and Applications

JF - Numerical Analysis and Applications

SN - 1995-4239

IS - 2

ER -