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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
Historic
Publication Date:
2015
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 http://www.ebooklibrary.org/


Description
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.

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

Excerpt
Bourassa, A. E., Degenstein, D., and Llewellyn, E.: SASKTRAN: a spherical geometry radiative transfer code for efficient estimation of limb scattered sunlight, J. Quant. Spectrosc. Ra., 109, 52–73, doi:10.1016/j.jqsrt.2007.07.007, 2008.; Bourassa, A. E., McLinden, C. A., Sioris, C. E., Brohede, S., Bathgate, A. F., Llewellyn, E. J., and Degenstein, D. A.: Fast NO2 retrievals from Odin-OSIRIS limb scatter measurements, Atmos. Meas. Tech., 4, 965–972, doi:10.5194/amt-4-965-2011, 2011.; Bovensmann, H., Burrows, J. P., Buchwitz, M., Frerick, J., Noël, S., Rozanov, V. V., Chance, K. V., and Goede, A. P. H.: SCIAMACHY: mission objectives and measurement modes, J. Atmos. Sci, 56, 127–150, doi:2.0.CO;2>10.1175/1520-0469(1999)056<0127:SMOAMM>2.0.CO;2, 1999.; Collins, D. G., Blättner, W. G., Wells, M. B., and Horak, H. G.: Backward Monte Carlo calculations of the polarization characteristics of the radiation emerging from spherical-shell atmospheres, Appl. Optics, 11, 2684–2696, doi:10.1364/AO.11.002684, 1972.; Degenstein, D. A., Bourassa, A. E., Roth, C. Z., and Llewellyn, E. J.: Limb scatter ozone retrieval from 10 to 60 km using a multiplicative algebraic reconstruction technique, Atmos. Chem. Phys., 9, 6521–6529, doi:10.5194/acp-9-6521-2009, 2009.; Delaunay, B.: Sur la sphère vide. A la mémoire de Georges Vorono\\i, Bulletin de l'Académie des Sciences de l'URSS. Classe des sciences mathématiques et na, Bull. Acad. Sci. URSS. Sér. Math., 7, 793–800, 1934.; Deutschmann, T., Beirle, S., Frieß, U., Grzegorski, M., Kern, C., Kritten, L., Platt, U., Prados-Román, C., Puķīte, J., Wagner, T., Werner, B., and Pfeilsticker, K.: The Monte Carlo atmospheric radiative transfer model McArtim: introduction and validation of Jacobians and 3D features, J. Quant. Spectrosc. Ra., 112, 1119–1137, doi:10.1016/j.jqsrt.2010.12.009, 2011.; Griffioen, E. and Oikarinen, L.: LIMBTRAN: a pseudo three-dimensional radiative transfer model for the limb-viewing imager OSIRIS on the Odin satellite, J. Geophys. Res.-Atmos., 105, 29717–29730, doi:10.1029/2000JD900566, 2000.; Haley, C., von Savigny, C., Brohede, S., Sioris, C., McDade, I., Llewellyn, E., and Murtagh, D.: A comparison of methods for retrieving stratospheric ozone profiles from OSIRIS limb-scatter measurements, Adv. Space Res., 34, 769–774, doi:10.1016/j.asr.2003.08.058, 2004.; Kaiser, J. W. and Burrows, J. P.: Fast weighting functions for retrievals from limb scattering measurements, J. Quant. Spectrosc. Ra., 77, 273–283, doi:10.1016/S0022-4073(02)00125-5, 2003.; Rozanov, A., Eichmann, K.-U., von Savigny, C., Bovensmann, H., Burrows, J. P., von Bargen, A., Doicu, A., Hilgers, S., Godin-Beekmann, S., Leblanc, T., and McDermid, I. S.: Comparison of the inversion algorithms applied to the ozone vertical profile retrieval from SCIAMACHY limb measurements, Atmos. Chem. Phys., 7, 4763–4779, doi:10.5194/acp-7-4763-2007, 2007.; Rozanov, A., Kühl, S., Doicu, A., McLinden, C., Puķīte, J., Bovensmann, H., Burrows, J. P., Deutschmann, T., Dorf, M., Goutail, F., Grunow, K., Hendrick, F., von Hobe, M., Hrechanyy, S., Lichtenberg, G., Pfeilsticker, K., Pommereau, J. P., Van Roozendael, M., Stroh, F., and Wagner, T.: BrO vertical distributions from SCIAMACHY limb measurements: comparison of algorithms and retrie

 

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