Great. I have always been very sceptical of envirnoment and physical system response; for instance the inertia of the oceans. If the thermohaline current takes ..oh.. some 1500 years from subduction in the North Atlantic along the ocean floors around the Pacific to emerge again somewhere in the south, how long would it take for the complete ocean to notice a change at the surface and how long would it take to complete equilibrium (say a sudden imput of some tera tonnes of salt, just to give an idea and to avoid climate issues like a sudden warming). Obviously such a problem is a higher order, partial lineair open loop system.
Don't look at the oceanic proxies. We would like to compare a pristine result with the harsh reality.