Timescales
¥Rapid fluctuations in ocean surface forcing are:
¥    - considerable in amplitude
¥    - ÒfastÓ compared to ocean circulation
¥    - can be considered as stochastic in time
¥    - spatially coherent (storm tracks, standing waves)
¥Ocean response – perturbation development:
¥     - linear nonmodal
¥     - linear modal
¥     - nonlinear