Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
Ocean Sci., 10, 881-891, 2014
http://www.ocean-sci.net/10/881/2014/
doi:10.5194/os-10-881-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
07 Nov 2014
Changes in extreme regional sea surface height due to an abrupt weakening of the Atlantic meridional overturning circulation
S.-E. Brunnabend1, H. A. Dijkstra1, M. A. Kliphuis1, B. van Werkhoven2, H. E. Bal2, F. Seinstra2, J. Maassen3, and M. van Meersbergen3 1Institute of Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, 3584 CC Utrecht, the Netherlands
2Department of Computer Science, VU University Amsterdam, 1081 HV Amsterdam, the Netherlands
3Netherlands eScience Center, 1098 XG Amsterdam, the Netherlands
Abstract. As an extreme scenario of dynamical sea level changes, regional sea surface height (SSH) changes that occur in the North Atlantic due to an abrupt weakening of the Atlantic meridional overturning circulation (AMOC) are simulated. Two versions of the same ocean-only model are used to study the effect of ocean model resolution on these SSH changes: a high-resolution (HR) strongly eddying version and a low-resolution (LR) version in which the effect of eddies is parameterised. The weakening of the AMOC is induced in both model versions by applying strong freshwater perturbations around Greenland. A rapid decrease of the AMOC in the HR version induces much shorter return times of several specific regional and coastal extremes in North Atlantic SSH than in the LR version. This effect is caused by a change in main eddy pathways associated with a change in separation latitude of the Gulf Stream.

Citation: Brunnabend, S.-E., Dijkstra, H. A., Kliphuis, M. A., van Werkhoven, B., Bal, H. E., Seinstra, F., Maassen, J., and van Meersbergen, M.: Changes in extreme regional sea surface height due to an abrupt weakening of the Atlantic meridional overturning circulation, Ocean Sci., 10, 881-891, doi:10.5194/os-10-881-2014, 2014.
Publications Copernicus
Download
Short summary
Regional sea surface height (SSH) changes due to an abrupt weakening of the Atlantic meridional overturning circulation (AMOC) are simulated with a high- and low-resolution model. A rapid decrease of the AMOC in the high-resolution version induces shorter return times of several specific regional and coastal extremes in North Atlantic SSH than in the low-resolution version. This effect is caused by a change in main eddy pathways associated with a change in separation latitude of the Gulf Stream.
Regional sea surface height (SSH) changes due to an abrupt weakening of the Atlantic meridional...
Share