A Nonnormal View of Ocean Variability Stochastically Forced by the North Atlantic Oscillation
Pr Andrew M MooreOcean Sciences Dpt - University of California, Santa Cruz
Wednesday, June 11th, CERFACS Conference Room - 11h00
The North Atlantic Oscillation (NAO) exerts considerable control on many aspects of the atmospheric circulation in the North Atlantic. It is broadly characterised by variability on a range of timescales. The long timescale variability is often referred to as the "climate regime," and variability on shorter timescales as the "weather regime." The focus of this talk will be the influence of the "weather regime" on the wind-driven ocean circulation. On ocean timescales, the NAO "weather regime" can be viewed as stochastic forcing. The response of the ocean to this stochastic forcing has been explored using an eddy permitting quasigeostrophic model, with particular emphasis on the role that linear eigenmode/wave interference plays in controlling the ocean variability. The implications of the findings from the model experiments for the interpretation of ocean observations and ocean forecasting will be discussed.
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