Asynchronous warming and δ¹⁸O evolution of deep Atlantic water masses during the last deglaciation.

ABSTRACT: The large-scale reorganization of deep ocean circulation in the Atlantic involving changes in North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) played a critical role in regulating hemispheric and global climate during the last deglaciation. However, changes in the relative contributions of NADW and AABW and their properties are poorly constrained by marine records, including δ¹⁸O of benthic foraminiferal calcite (δ¹⁸O_c). Here, we use an isotope-enabled ocean general circulation model with realistic geometry and forcing conditions to simulate the deglacial water mass and δ¹⁸O evolution. Model results suggest that, in response to North Atlantic freshwater forcing during the early phase of the last deglaciation, NADW nearly collaps

SUBMITTER: Zhang J 

PROVIDER: S-EPMC5651742 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature