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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 8
Ann. Geophys., 15, 1067-1075, 1997
https://doi.org/10.1007/s00585-997-1067-1
© European Geosciences Union 1997
Ann. Geophys., 15, 1067-1075, 1997
https://doi.org/10.1007/s00585-997-1067-1
© European Geosciences Union 1997

  31 Aug 1997

31 Aug 1997

Effects of convection instability due to incompatibility between ocean dynamics and surface forcings

W. Cai1 and P. C. Chu2 W. Cai and P. C. Chu
  • 1CSIRO Division of Atmospheric Research, Aspendale, Victoria, Australia
  • 2Department of Oceanography, Naval Postgraduate School, Monterey, CA 93943, USA

Abstract. The study demonstrates that an incompatibility between a surface temperature climatology and a given ocean model, into which the climatology is assimilated via Haney restoration, can cause model ocean climate drift and interdecadal oscillations when the ocean is switched to a weaker restoration. This is made using an idealized Atlantic Ocean model driven by thermal and wind forcing only. Initially, the temperature climatology is forcefully assimilated into the model, and an implied heat flux field is diagnosed. During this stage any incompatibility is suppressed. The restoring boundary condition is then switched to a new forcing consisting of a part of the diagnosed flux and a part of the restoring forcing in such a way that at the moment of the switching the heat flux is identical to that prior to the switching. Under this new forcing condition, the incompatibility becomes manifest, causing changes in convection patterns, and producing drift and interdecadal oscillations. The mechanisms are described.

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