Multispectral Monte Carlo radiative transfer simulation by the maximum cross-section method

Hironobu Iwabuchi, Rintaro Okamura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The maximum cross-section method is useful for efficient Monte Carlo radiative transfer simulation in an inhomogeneous atmosphere that consists of many small volume elements. Here a new method for multispectral radiative transfer calculation is proposed to simultaneously estimate multispectral radiances, irradiances, and flux divergences for atmospheric systems with different absorption coefficients. The maximum cross-section method is used to accelerate the calculation algorithm for atmospheres with spatial and spectral variations of optical properties. An example for a broken cumulus cloud field shows that the proposed method enables acceleration on the computational speed per wavelength by 5, 30, and 70 times faster when simultaneously calculating radiances in 10, 100, and 1000 wavelengths, respectively. The method provides a means for efficiently calculating a high-resolution spectrum in a narrow band for a three-dimensionally inhomogeneous atmosphere.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Publication statusPublished - 2017 May 1


  • 3D radiative transfer
  • Maximum cross-section method
  • Monte Carlo method
  • Multispectral radiative transfer

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy


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