Temporal offsets between surface temperature, ice-rafting and bottom flow speed proxies in the glacial (MIS 3) northern North Atlantic

L. Jonkers, M.A. Prins, M. Moros, G.J. Weltje, S.R. Troelstra, G.J.A. Brummer

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Rapid climatic switches during marine isotope stage 3 (29-59 ka BP) are often attributed to ocean circulation changes caused by freshwater input into the North Atlantic through the melting of large amounts of icebergs and sea ice. However, recent studies have questioned this direct coupling between factors influencing the ocean-climate system. By combining multiple proxies from two mid depth northern North Atlantic sediment cores we assess temporal offsets and links between freshwater input and response of the near bottom flow as well as between near bottom flow and sea surface temperatures changes. Grain size, mineralogical and magnetic proxies for ice rafting and near-bottom flow speed, interpreted as indicators of freshwater input and deep circulation strength, consistently indicate a delay in the recovery of the deep circulation after freshwater perturbations.Sea surface temperature variability is inferred from foraminiferal assemblages and Mg/Ca and δ
Original languageEnglish
Pages (from-to)43-53
JournalQuaternary Science Reviews
Volume48
DOIs
Publication statusPublished - 2012

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