The effect of condensation on the moisture dynamics is examined in two flow fields. In the first case the moisture is advected by a one dimensional Brownian motion. The moisture field is initially saturated and then decays through condensation as individual particles enter regions of lower saturation specific humidity. In the second case the moisture is advected by isotropic, homogeneous, two-dimensional turbulence and a statistically steady moisture field is obtained.
The modified mixing length closure is tested for both flow fields. The closure is shown to capture basic effects such as condensation in the absence of mean supersaturation or mean flux convergence, as well as the effect of the saturation deficit on the magnitude of the eddy moisture flux.
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