Hurricane formation in diabatic Ekman turbulence

摘要: This article investigates the emergence of hurricanes from chaotic swirling motions in a three-layer model tropical troposphere that includes basic parametrizations cumulus convection and air--sea interaction. The flow is referred to as diabatic Ekman turbulence (DET), order emphasize pumping are critical its behaviour. time required for hurricane formation DET examined over broad range sea-surface temperatures, latitudes surface exchange coefficients moist entropy momentum. mean trends sensible, but given set parameters, genesis can vary significantly with subtle changes initial turbulence. Moreover, do not always form. In event depression develops into hurricane, process highly asymmetric. Intensification involves shear-flow instability, production mesovortices contraction circulation. Despite complex evolution, intensification rate largely consistent expectations quasi-linear stability analysis. Properties mature nature their fluctuations discussed context model. Copyright © 2009 Royal Meteorological Society