Late Pleistocene to Holocene composite speleothem 18O and 13C chronologies from South Island, New Zealand-did a global Younger Dryas really exist?

Major trends in the δ18Oc record are similar to the Northern Hemisphere, but second order detail is often distinctly different. Consequently, at the millennial scale, a more convincing case can be made for asymmetric climatic response between the two hemispheres rather than synchronicity.