25th Conference on Hurricanes and Tropical Meteorology


Regulation of Tropical Deep Convection by SST and Wind Speed

Ian A. Folkins, Dalhousie University, Halifax, NS, Canada

In the tropics, deep convection requires a threshold SST of 26.5 C. We show that this threshold is associated with the SST at which a significant fraction of air parcels in the boundary layer have positive CAPE, i.e. a pseudoequivalent potential temperature larger than 345 K. For SSTs larger than 28 C, increased SST is offset by decreased wind speed, so that the frequency of deep convection becomes independent of SST.

Session 14C, Ocean-Atmosphere Interaction III (Parallel with Sessions 14A, 14B, and 14D)
Thursday, 2 May 2002, 2:00 PM-3:30 PM

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