Patterns of millennial variability over the last 500 ka

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doi: 10.5194/cp-6-295-2010
Author(s): Siddall, Mark; Rohling, Eelco J.; Blunier, Thomas; Spahni, Renato
Author Affiliation(s): Primary:
University of Bristol, Department of Earth Science, Bristol, United Kingdom
Other:
National Oceanography Centre, Southampton, United Kingdom
University of Copenhagen, Denmark
University of Bern, Switzerland
Volume Title: Climate of the Past
Source: Climate of the Past, 6(3), p.295-303. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. Part of special issue no. 29, Retrospective views on our planet's future - PAGES open science meeting 2009, edited by Kiefer, T., et al., http://www.clim-past.net/special_issue29.html; published in Climate of the Past Discussion: 29 January 2010, http://www.clim-past-discuss.net/6/19/2010/cpd-6-19-2010.html; accessed in Oct., 2010; abstract: doi:10.5194/cp-6-295-2010. 44 refs.; illus., incl. 1 table
Summary: Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession via sea-ice feedbacks and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Albedo; Aliphatic hydrocarbons; Alkanes; Antarctica; Atlantic Ocean; Atmospheric circulation; Cenozoic; Climate change; Climate forcing; Cycles; Dansgaard-Oeschger cycles; Deuterium; Dome C; EPICA; Glacial environment; Glacial geology; Glaciation; Hydrocarbons; Hydrogen; Ice; Ice rafting; Ice sheets; Indian Ocean; Insolation; Isotopes; Last glacial maximum; Leg 162; MIS 3; Methane; North Atlantic; Northern Hemisphere; ODP Site 980; Ocean Drilling Program; Organic compounds; Paleoclimatology; Precession; Quaternary; Red Sea; Rockall Bank; Sea ice; Sea-level changes; Stable isotopes; Wilkes Land
Coordinates: N552906 N552906 W0144208 W0144208
Record ID: 2011000638
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany