Comparing Estimates of Turbulence Based on Near-Surface Measurements in the Nocturnal Stable Boundary Layer
2011
Bocquet, Florence | Balsley, Ben | Tjernström, Michael | Svensson, Gunilla
Tethered Lifting System (TLS) estimates of the dissipation rate of turbulent kinetic energy [graphic removed] are reasonably well correlated with concurrent measurements of vertical velocity variance [graphic removed] obtained from sonic anemometers located on a nearby 60-m tower during the CASES-99 field experiment. Additional results in the first 100 m of the nocturnal stable boundary layer confirm our earlier claim that the presence of weak but persistent background turbulence exists even during the most stable atmospheric conditions, where [graphic removed] can exhibit values as low as 10⁻⁷ m² s⁻³. We also present a set of empirical equations that incorporates TLS measurements of temperature, horizontal wind speed, and [graphic removed] to provide a proxy measurement for [graphic removed] at altitudes higher than tower heights.
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