A simple heat-salt oscillator |
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| Authors: | Pierre Welander |
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| Institution: | School of Oceanography, University of Washington, Seattle, WA 98195, U.S.A. |
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| Abstract: | A theoretical study is made of a simple mixed-layer model, in the form of a well-mixed constant-depth layer, forced from above by a heat flux kT(TA−T) and salinity flux kS(SA−S), where TA and SA are two reference values and T and S the temperature and salinity of the layer. The layer has a turbulent exchange of heat and salt with underlying water, kept at constant temperature and salinity, which is small in a statically stable case; large in a statically unstable case. If kT>kS, self-sustained oscillations may occur. In one cycle, a fast temperature rise, a slower salinity increase, and a final relaxation when the layer adjusts to the conditions of the underlying water, are observed. |
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