Dansgaard-Oeschger forcing of sea surface temperature variability in the midlatitude North Atlantic between 500 and 400 ka (MIS 12)

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doi: 10.1002/2014PA002697
Author(s): Naafs, B. D. A.; Hefter, J.; Stein, R.
Author Affiliation(s): Primary:
University of Bristol, Organic Geochemistry Unit, Bristol, United Kingdom
Alfred Wegener Institute for Polar and Marine Research, Germany
Volume Title: Paleoceanography
Source: Paleoceanography, 29(11), p.1024-1030. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 40 refs.; illus., incl. sketch map
Summary: Using a high-resolution record of alkenone-based sea surface temperatures (SSTs) from the midlatitude North Atlantic covering the period between 500 and 400 ka here we show that during Marine Isotope Stage (MIS) 12, SSTs in this region were characterized by numerous abrupt jumps in the order of 3-6°C, spaced every 3-4 ka. We argue that these abrupt warming events in the midlatitude North Atlantic reflect Dansgaard-Oeschger (D/O) events, which are corroborated by the correlation to the synthetic record of Greenland climate for this time period. These results demonstrate that during MIS 12 the direct influence of high-latitude climate was far larger than during the last glacial and reached all the way into the midlatitude North Atlantic. In addition the consistent temporal lag between surface water cooling and appearance of ice-rafted debris demonstrates that icebergs were not the cause for cooling in the North Atlantic at this time. We hypothesize that the extreme impact of D/O events during MIS 12 as recorded in our record must have had an imprint on global climate and will therefore be important to evaluate future high-resolution climate records or model efforts that cover this time period. Abstract Copyright (2014), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Alkenones; Atlantic Ocean; Cenozoic; Dansgaard-Oeschger cycles; Expedition 306; Expeditions 303/306; IODP Site U1313; Integrated Ocean Drilling Program; Ketones; MIS 12; Marine environment; Mid-Atlantic Ridge; Middle Pleistocene; North Atlantic; Organic compounds; Paleoclimatology; Paleoenvironment; Paleotemperature; Pleistocene; Quaternary; Sea-surface temperature
Coordinates: N410000 N410000 W0325700 W0325700
Record ID: 2015016234
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom