Stability of the thermohaline circulation in a simple coupled model

• Main Authors: Lohmann, Gerrit, Gerdes, Rüdiger, Chen, D.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 1996
• Subjects: North Atlantic
• Online Access: https://epic.awi.de/id/eprint/1987/; https://hdl.handle.net/10013/epic.12578

In an analytical study the stability of the thermohaline circulation with respect to freshwater perturbations in high latitudes is investigated. The study is based on a coupled ocean and atmosphere box model in an idealized North Atlantic geometry. The box model provides a qualitative understanding of how the thermohaline circulation is affected by feedback mechanisms associated with changes in atmospheric transports of heat and moisture. Within a linear analysis we examine the stability of the thermohaline circulation for a range of different atmospheric boundary conditions. The stability of the coupled system depends on the imposed transport parameterizations and the basic state. For the underlying non-linear system we examine the sensitivity with respect to the strength of salinity perturbation.