Time series 2D simulation for narrow field of view LW radiometers in order to optimize sampling frequency and zenith angle

Thierry Besnard; Marine Pavlaud; Matthieu Collet; Charles N. Long; Didier Gillotay; Laurent Berger; Fabrice Zanghi; Thiago Ferreira Da Silva; Jean Charles Dupont

doi:10.1117/12.633343

1 November 2005 Time series 2D simulation for narrow field of view LW radiometers in order to optimize sampling frequency and zenith angle

Thierry Besnard, Marine Pavlaud, Matthieu Collet, Charles N. Long, Didier Gillotay, Laurent Berger, Fabrice Zanghi, Thiago Ferreira Da Silva, Jean Charles Dupont

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Proceedings Volume 5979, Remote Sensing of Clouds and the Atmosphere X; 59791J (2005) https://doi.org/10.1117/12.633343
Event: SPIE Remote Sensing, 2005, Bruges, Belgium

Abstract

Since more than a decade, several instruments using narrow field of view radiometers and applying time series, snapshots and scanning techniques have been developed to monitor down welling long wave radiations and by consequence cloud cover intensity. For regular monitoring of cloud cover, in atmospheric measurement networks the time series technique has already been used with ceilometric data and now with narrow field of view (NFOV) radiometers. In order to determine the best set of data for sampling frequency, zenith angle and also field of view, we built a numerical simulator calculating interactions between a measurement grid in the approximation of the parallel plan model and binarized cloud fields generated by the "Larges Eddies Simulation" method. We will present results obtained with various sets of radiometers with different geometries facing to cloud fields simulating a wide range of broken clouds conditions. As a conclusion, we provide recommendations for positioning and feature of NFOV radiometers and finally we will discuss potential improvements of these simulation techniques.

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Thierry Besnard, Marine Pavlaud, Matthieu Collet, Charles N. Long, Didier Gillotay, Laurent Berger, Fabrice Zanghi, Thiago Ferreira Da Silva, and Jean Charles Dupont "Time series 2D simulation for narrow field of view LW radiometers in order to optimize sampling frequency and zenith angle", Proc. SPIE 5979, Remote Sensing of Clouds and the Atmosphere X, 59791J (1 November 2005); https://doi.org/10.1117/12.633343

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KEYWORDS

Clouds

Sensors

Radiometry

Thermodynamics

Monte Carlo methods

Temperature metrology

Computer simulations

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