Reduced millennial variability during glacial Stage 6 in the central North Atlantic

Author(s): Obrochta, S.; Crowley, Thomas J.; Yokoyama, Y.
Author Affiliation(s): Primary:
University of Tokyo, Chiba, Japan
Other:
Braeheads Institute, United Kingdom
Volume Title: AGU 2013 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2013; American Geophysical Union 2013 fall meeting, San Francisco, CA, Dec. 9-13, 2013. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: A combined central North Atlantic record form Sites DSDP 609 and IODP U1308 includes the last three glaciations. Glacial Stages 2-4 and 8 exhibit similar variability, with Hudson Strait (HS) Heinrich Events corresponding to periods of weak East Asian summer monsoon and Antarctic warming. However during Stage 6, few large ice rafting events are detected, and the flux of IRD during the largest, "H11" (not sourced from the HS), is an order of magnitude lower than the average for those of the last glaciation. In the absence of significant millennial ice-rafting events, weakened monsoon and Antarctic warming correspond to intervals of sea ice expansion during low (high) insolation (precession), as indicated by increased abundance of N. pachyderma (s) and Icelandic volcanic glass, both of which are associated with sea ice. North Atlantic millennial-scale relative stability during Stage 6 could have been the result of a smaller LIS that was less prone to surging, reducing the impact of freshwater forcing on North Atlantic hydrography.
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
Key Words: 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Cores; DSDP Site 609; Deep Sea Drilling Project; Expedition 303; Expeditions 303/306; IODP Site U1308; IPOD; Integrated Ocean Drilling Program; Leg 94; Marine sediments; Mid-Atlantic Ridge; North Atlantic; Northeast Atlantic; Paleoclimatology; Sediments
Coordinates: N495300 N495300 W0241400 W0241400
N495240 N495241 W0241417 W0241418
Record ID: 2015080436
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