Path-averaged turbulent heat fluxes from scintillation measurements at two wavelengths

Edgar L Andreas

doi:10.1117/12.21870

1 September 1990 Path-averaged turbulent heat fluxes from scintillation measurements at two wavelengths

Edgar L Andreas

Proceedings Volume 1312, Propagation Engineering: Third in a Series; (1990) https://doi.org/10.1117/12.21870
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

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 (H_S) and latent (H_L) 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, C_n² , 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, H_S and H_L will, typically, have uncertainties of 10-20% when the Bowen ratio, Bo = H_S/H_L, obeys -2.5 < Bo < -0.015 or 0.03 < Bo < 5.

Citation Download Citation

Edgar L Andreas "Path-averaged turbulent heat fluxes from scintillation measurements at two wavelengths", Proc. SPIE 1312, Propagation Engineering: Third in a Series, (1 September 1990); https://doi.org/10.1117/12.21870

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