Deglacial Heat Uptake by the Southern Ocean and Rapid Northward Redistribution Via Antarctic Intermediate Water

摘要: Antarctic Intermediate Water (AAIW) is an important conduit for nutrients to reach the nutrient‐poor low‐latitude ocean areas. In Atlantic, it forms part of return path Atlantic Meridional Overturning Circulation (AMOC). Despite importance AAIW, little known about variations in its composition and signature during prominent AMOC climate changes last deglaciation. Here, we reconstruct benthic foraminiferal Mg/Ca‐based intermediate water temperatures (IWTMg/Ca) neodymium (Nd) isotope compositions at sub‐millennial resolution from unique sediment cores located northern tip modern AAIW extent tropical W‐Atlantic (850 1018 m depth). Our data indicate a pronounced warming Heinrich Stadial 1 (HS1) Younger Dryas (YD). We argue that these events were induced by major perturbations resulting accumulation heat surface Southern Ocean. Combined with published results, our suggest subsequent uptake Ocean rapid northward transfer W‐Atlantic. Hence, deglacial directly controlled budget after detour via speculate redistribution effectively dampened Hemisphere deglaciation may therefore have been crucial player seesaw mechanisms between two hemispheres.