Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany

Silke Vogelbacher; Alexander M. J. van Eijk; Detlev Sprung; Leo H. Cohen; Erik Sucher; Karin Stein

doi:10.1117/12.2240644

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20 October 2016 Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany

Silke Vogelbacher, Alexander M. J. van Eijk, Detlev Sprung, Leo H. Cohen, Erik Sucher, Karin Stein

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Proceedings Volume 10002, Optics in Atmospheric Propagation and Adaptive Systems XIX; 1000203 (2016) https://doi.org/10.1117/12.2240644
Event: SPIE Remote Sensing, 2016, Edinburgh, United Kingdom

Abstract

A transmission experiment has been performed over an optical path of 1.53 km at a rural test site in Meppen, Northwest Germany. Direct transmission measurements were made by a 7-wavelength transmissometer. Transmission was further estimated from the average voltage received by a BLS2000 scintillometer, and evaluated with Mie theory from in-situ aerosol measurements near the optical path. Furthermore, the transmission was modeled with MODTRAN, driven with local meteorology, visibility and the rural aerosol model. For a central wavelength of 0.88μm, the transmissometer, the BLS200 and MODTRAN agree well. Remaining differences may be due to water transmission and continuum around 0.95μ;m that is picked up by the transmissometer and not by the narrow-banded BLS2000 and MODTRAN calculations. When MODTRAN is run without an aerosol model, or when this model is driven by a “default” visibility, the overlap with the measurements is extremely poor.

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Silke Vogelbacher, Alexander M. J. van Eijk, Detlev Sprung, Leo H. Cohen, Erik Sucher, and Karin Stein "Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany", Proc. SPIE 10002, Optics in Atmospheric Propagation and Adaptive Systems XIX, 1000203 (20 October 2016); https://doi.org/10.1117/12.2240644

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