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High Resolution and Monte Carlo Additions to the Sasktran Radiative Transfer Model : Volume 8, Issue 3 (27/03/2015)

By Zawada, D. J.

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Book Id: WPLBN0004000426
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: High Resolution and Monte Carlo Additions to the Sasktran Radiative Transfer Model : Volume 8, Issue 3 (27/03/2015)  
Author: Zawada, D. J.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Rieger, L. A., Bourassa, A. E., Degenstein, D. A., Dueck, S. R., Lloyd, N. D., & Zawada, D. J. (2015). High Resolution and Monte Carlo Additions to the Sasktran Radiative Transfer Model : Volume 8, Issue 3 (27/03/2015). Retrieved from

Description: Institute of Space and Atmospheric Studies, Saskatchewan, Canada. The OSIRIS instrument on board the Odin spacecraft has been measuring limb scattered radiance since 2001. The vertical radiance profiles measured as the instrument nods are inverted, with the aid of the SASKTRAN radiative transfer model, to obtain vertical profiles of trace atmospheric constituents. Here we describe two newly developed modes of the SASKTRAN radiative transfer model: a high spatial resolution mode, and a Monte Carlo mode. The high spatial resolution mode is a successive orders model capable of modelling the multiply scattered radiance when the atmosphere is not spherically symmetric; the Monte Carlo mode is intended for use as a highly accurate reference model. It is shown that the two models agree in a wide variety of solar conditions to within 0.2%. As an example case for both models, Odin-OSIRIS scans were simulated with the Monte Carlo model and retrieved using the high resolution model. A systematic bias of up to 4% in retrieved ozone number density between scans where the instrument is scanning up or scanning down was identified. It was found that calculating the multiply scattered diffuse field at five discrete solar zenith angles is sufficient to eliminate the bias for typical Odin-OSIRIS geometries.

High resolution and Monte Carlo additions to the SASKTRAN radiative transfer model

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