UBC Faculty Research and Publications

Convective Transport Theory for Surface Fluxes Tested over the Western Pacific Warm Pool. Greischar, Lawrence; Stull, Roland B.

Abstract

Turbulent flux measurements from five flights of the National Center for Atmospheric Research Electra aircraft during the Tropical Oceans and Global Atmosphere Coupled Ocean–Atmosphere Response Experiment (TOGA COARE) are used to test convective transport theory (CTT) for a marine boundary layer. Flights during light to moderate winds and under the clearest sky conditions available were chosen. Fluxes of heat, moisture, and momentum were observed by the eddy-correlation method. Mean kinematic values for the observed sensible and latent heat fluxes and momentum flux were 0.0061 K m s−1, 0.0313 g kg−1 m s−1, and 0.0195 m2 s−2, respectively. For the range of mixed-layer wind speeds (0.8–8.4 m s−1) studied here, the version of CTT that includes the mixed effects of buoyant and shear-driven transport give a better fit to the observations than either the COARE bulk algorithm or the pure free-convection version of CTT. This is to be expected because both of those latter parameterizations were designed for light winds (

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