Sea surface temperatures did not control the first occurrence of Hudson Strait Heinrich events during MIS 16

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doi: 10.1029/2011PA002135
Author(s): Naafs, B. David A.; Hefter, Jens; Ferretti, Patrizia; Stein, Ruediger; Haug, Gerald H.
Author Affiliation(s): Primary:
Alfred Wegener Institute for Polar and Marine Research, Department of Marine Geology and Paleontology, Bremerhaven, Germany
University Ca' Foscari of Venice, Italy
Potsdam University, Germany
Volume Title: Paleoceanography
Source: Paleoceanography, 26(4). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 60 refs.; illus., incl. sketch map
Summary: Hudson Strait (HS) Heinrich Events, ice-rafting events in the North Atlantic originating from the Laurentide ice sheet (LIS), are among the most dramatic examples of millennial-scale climate variability and have a large influence on global climate. However, it is debated as to whether the occurrence of HS Heinrich Events in the (eastern) North Atlantic in the geological record depends on greater ice discharge, or simply from the longer survival of icebergs in cold waters. Using sediments from Integrated Ocean Drilling Program (IODP) Site U1313 in the North Atlantic spanning the period between 960 and 320 ka, we show that sea surface temperatures (SSTs) did not control the first occurrence of HS Heinrich(-like) Events in the sedimentary record. Using mineralogy and organic geochemistry to determine the characteristics of ice-rafting debris (IRD), we detect the first HS Heinrich(-like) Event in our record around 643 ka (Marine Isotope Stage (MIS) 16), which is similar as previously reported for Site U1308. However, the accompanying high-resolution alkenone-based SST record demonstrates that the first HS Heinrich(-like) Event did not coincide with low SSTs. Thus, the HS Heinrich(-like) Events do indicate enhanced ice discharge from the LIS at the end of the Mid-Pleistocene Transition, not simply the survivability of icebergs due to cold conditions in the North Atlantic.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Alkenones; Atlantic Ocean; Cenozoic; Climate change; Expedition 306; Expeditions 303/306; Foraminifera; Geochemistry; Glacial geology; Heinrich events; Holocene; Hudson Strait; IODP Site U1313; Ice; Ice rafting; Icebergs; Integrated Ocean Drilling Program; Invertebrata; Ketones; Laurentide ice sheet; MIS 16; Marine sedimentation; Microfossils; Mid-Atlantic Ridge; North Atlantic; Organic compounds; Paleoclimatology; Pleistocene; Protista; Quaternary; Sea water; Sea-surface temperature; Sedimentation; Sedimentation rates; X-ray diffraction data
Coordinates: N410000 N410000 W0325700 W0325700
Record ID: 2014039624
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