Model for approximating profiles of meteorological quantities and extinction, absorption and backscatter coefficients in very low stratus clouds and their associated subcloud regions

Neal Harold Kilmer; Henry Rachele

doi:10.1117/12.21877

1 September 1990 Model for approximating profiles of meteorological quantities and extinction, absorption, and backscatter coefficients in very low stratus clouds and their associated subcloud regions

Neal Harold Kilmer, Henry Rachele

Author Affiliations +

Proceedings Volume 1312, Propagation Engineering: Third in a Series; (1990) https://doi.org/10.1117/12.21877
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

A model is presented for simulating very low stratus clouds and their associated subcloud regions. This model includes droplet growth, mass balance of total water, thermodynamics, similarity, and parcel ascent. The model requires only limited user input: some conventional meteorological values at a reference height (2 m above ground level) and some parameter values and other specifications. Input values for a visibility parameter and relative humidity are used to define the parameters of a bimodal lognormal dropsize distribution at the reference height. Drop size distributions are simulated and plotted for cases for which relative humidity at the reference height is 95 and 98 percent. Backscatter, absorption, and total extinction coefficients are calculated using Mie efficiency factors with simulated drop size distributions and plotted as functions of height for wavelengths of 0.55, 0.625, 1.06, 3.8, 4.0, and 10.6 micrometers.

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Neal Harold Kilmer and Henry Rachele "Model for approximating profiles of meteorological quantities and extinction, absorption, and backscatter coefficients in very low stratus clouds and their associated subcloud regions", Proc. SPIE 1312, Propagation Engineering: Third in a Series, (1 September 1990); https://doi.org/10.1117/12.21877

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