Boundary-Layer Growth over the Tropical Ocean

Abstract

Results of a one-dimensional mixed-layer growth model are compared with thermodynamic observations made during the GARP Atlantic Tropical Experiment (GATE). Observed drying at low levels accompanying warming in the wake of a storm is hypothesized to be the result of rapid mixed-layer growth as well as of subsidence in the environment outside the storm. Sensitivity of the model solutions to changes in subsidence and stability above the mixed layer is shown. Model solutions show protracted recovery periods only when the wind speed near the surface is moderate (?3 m s?1). Recovery of the mixed layer in the wake of the 12 September 1974 GATE squall line is simulated by the model.