Plymouth Marine Laboratory, University of Bergen - Department of Mathematics, Plymouth Marine Laboratory, Bjerknes Centre for Climate Research, Plymouth Marine Laboratory, Heriot-Watt University, GEOMAR Helmholtz Centre for Ocean Research Kiel, Heriot-Watt University, Bjerknes Centre for Climate Research, GEOMAR Helmholtz Centre for Ocean Research Kiel, University of Bergen - Department of Mathematics, GEOMAR Helmholtz Centre for Ocean Research Kiel, Heriot-Watt University, Plymouth Marine Laboratory, University of Bergen - Department of Mathematics, Bjerknes Centre for Climate Research and Heriot-Watt University