Open AccessMOCRA: a Monte Carlo code for the simulation of radiative transfer in the atmosphere
Author(s) -
Margherita Premuda,
Elisa Palazzi,
F. Ravegnani,
Daniele Bortoli,
Samuele Masieri,
G. Giovanelli
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.007973
Subject(s) - radiance , radiative transfer , monte carlo method , irradiance , remote sensing , transmittance , atmosphere (unit) , atmospheric optics , optics , atmospheric radiative transfer codes , physics , atmospheric model , environmental science , trace gas , meteorology , geology , statistics , mathematics
This paper describes the radiative transfer model (RTM) MOCRA (MOnte Carlo Radiance Analysis), developed in the frame of DOAS (Differential Optical Absorption Spectroscopy) to correctly interpret remote sensing measurements of trace gas amounts in the atmosphere through the calculation of the Air Mass Factor. Besides the DOAS-related quantities, the MOCRA code yields: 1- the atmospheric transmittance in the vertical and sun directions, 2- the direct and global irradiance, 3- the single- and multiple- scattered radiance for a detector with assigned position, line of sight and field of view. Sample calculations of the main radiometric quantities calculated with MOCRA are presented and compared with the output of another RTM (MODTRAN4). A further comparison is presented between the NO2 slant column densities (SCDs) measured with DOAS at Evora (Portugal) and the ones simulated with MOCRA. Both comparisons (MOCRA-MODTRAN4 and MOCRA-observations) gave more than satisfactory results, and overall make MOCRA a versatile tool for atmospheric radiative transfer simulations and interpretation of remote sensing measurements.