Cold wake of Hurricane Frances

摘要

An array of instruments air-deployed ahead of Hurricane Frances measured the three-dimensional, time dependent response of the ocean to this strong (60 ms(-1)) storm. Sea surface temperature cooled by up to 2.2 degrees C with the greatest cooling occurring in a 50-km-wide band centered 60-85 km to the right of the track. The cooling was almost entirely due to vertical mixing, not air-sea heat fluxes. Currents of up to 1.6 ms(-1) and thermocline displacements of up to 50 m dispersed as near-inertial internal waves. The heat in excess of 26 degrees C, decreased behind the storm due primarily to horizontal advection of heat away from the storm track, with a small contribution from mixing across the 26 degrees C isotherm. SST cooling under the storm core ( 0.4 degrees C) produced a 16% decrease in air-sea heat flux implying an approximately 5 ms(-1) reduction in peak winds.