Climate evolution at the last deglaciation: the role of the Southern Ocean

摘要: Abstract Two sediment sequences recovered close to, and south of, the present Polar Front (50°, 53°S) in Atlantic sector of Southern Ocean were analysed order to evaluate environmental evolution surface over last deglaciation Holocene. Our reconstruction is based on radiocarbon-dated records diatom-based sea temperature sea-ice proxies planktic foraminiferal stable isotopes. The onset deglacial warming gradual southward retreat winter field between 18 17 cal kyr BP, occurrence a thermal reversal centered at ca. 13 BP (Antarctic Cold Reversal, or ACR), early Holocene “climatic optimum” well correlate with climatic reconstructions available from Indian Antarctic ice cores. Time correspondence Heinrich event 1 North compatible transmission climate signal Northern Hemisphere through “bipolar seesaw.” data support modeling results suggesting that Bolling turn-on Deep Water formation are triggered by Ocean. Meltwater shedding into associated ACR may maintain during Allerod. development control atmospheric CO2 increase deglaciation. During (9–7 BP), our southern core renewed ocean cooling northward readvance field. Such common cores high-latitude sector, might be brought about expansion Weddell Gyre circulation time.