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Proceedings Paper

Path-averaged turbulent heat fluxes from scintillation measurements at two wavelengths
Author(s): Edgar L Andreas
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Paper Abstract

Measuring the scintillation of two electromagnetic waves that have propagated over a horizontal path near the earth's surface is tantamount to measuring the turbulent surface fluxes of sensible (HS) and latent (HL) heat, if we choose the wavelengths correctly. I call this the two-wavelength method. Here I show how to choose the two wavelengths and how to find the heat fluxes from a scintillation variable, Cn2 , the refractive index structure parameter. We optimize the two wavelength method by pairing a short wavelength--one in the visible or infrared regions--with a long wavelength--one in the millimeter or radio regions. With such a two-wavelength combination, HS and HL will, typically, have uncertainties of 10-20% when the Bowen ratio, Bo = HS/HL, obeys -2.5 < Bo < -0.015 or 0.03 < Bo < 5.

Paper Details

Date Published: 1 September 1990
PDF: 13 pages
Proc. SPIE 1312, Propagation Engineering: Third in a Series, (1 September 1990); doi: 10.1117/12.21870
Show Author Affiliations
Edgar L Andreas, U.S. Army Cold Regions Research and Engineering Lab. (United States)


Published in SPIE Proceedings Vol. 1312:
Propagation Engineering: Third in a Series
Luc R. Bissonnette; Walter B. Miller, Editor(s)

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