The Non-Linear Transient Response of a Continuously Stratified, Baroclinic Ocean to Stationary and Transitory Axially-Symmetric Atmospheric Cyclones.

A numerical model is developed to simulate circulation and mixing induced in an initially motionless, continuously stratified ocean by imposed axisymmetric hurricanes. Oceanic responses are obtained to (1) a suddenly applied steady wind permitting abruptly initiated oceanic spin-up followed by subsequent instantaneous wind removal allowing suddenly initiated spin-down, and (2) a transitory wind permitting gradual oceanic spin-up and subsequent spin-down. Exchanges of thermal properties across the air-sea interface are included, resulting in maximum reductions in sea surface temperature commensurate with observed values typically found in hurricane wakes. In addition to the generation of upwelling during spin-up beneath the central storm region, a core of anticyclonic vortex flow of temporally varying configuration and intensity is predicted at intermediate depths. Strong inertial oscillations are excited in the ocean velocity and kinetic energy fields in response to the suddenly imposed steady hurricane, whereas such oscillations are minimal in the ocean's response to the transitory storm. (Based on the author's doctoral dissertation.) 243 pp. Ref.