Southern Ocean deglacial record supports global Younger Dryas

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doi: 10.1016/S0012-821X(03)00556-9
Author(s): Andres, Miriam S.; Bernasconi, Stefano M.; McKenzie, Judith A.; Röhl, Ursula
Author Affiliation(s): Primary:
ETH-Zurich, Department of Earth Sciences, Zurich, Switzerland
University of Bremen, Federal Republic of Germany
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 216(4), p.515-524. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 49 refs.; illus., incl. 1 table, sketch map
Summary: In Northern Hemisphere deglaciation records, the transition from the last glacial to the Holocene indicates a rapid return to near-glacial conditions during the Younger Dryas, whereas their Southern Hemisphere ice core counterparts record two separate cooling events: the Antarctic Cold Reversal and the Oceanic Cold Reversal. Spatial distribution and relative timing of these events in both hemispheres are central for our understanding of causes and mechanisms of abrupt climate change. To date, no marine record from the southern mid-latitudes conclusively demonstrates that the Younger Dryas was a significant event in the Southern Ocean. Here, we present high-resolution oxygen isotope and iron content records of a radiocarbon-dated sedimentary sequence from the Great Australian Bight, which constrains oceanic and atmospheric changes during the last deglaciation. Oxygen isotopes from planktonic foraminifera indicate two rapid cold reversals (between 13.1 and 11.1 kyr BP) separated by a brief warming. The sedimentary iron content, interpreted as a proxy for wind strength, indicates a simultaneous change in atmospheric circulation pattern. Both records demonstrate the existence of cooling events in the Southern Hemisphere, which are synchronous with the Northern Hemisphere Younger Dryas cold reversal (between 12.9 and 11.5 kyr BP). Such evidence for the spatial distribution and timing of abrupt climatic fluctuations is essential data for groundtruthing results derived from global climate models. Abstract Copyright (2003) Elsevier, B.V.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Antarctic Cold Reversal; Biochemistry; C-14; Carbon; Cenozoic; Climate change; Cooling; Correlation; Dates; Deglaciation; Foraminifera; Glacial geology; Glaciation; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; Globigerinoides; Globigerinoides ruber; Great Australian Bight; Ice cores; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 182; Marine environment; Marine sediments; Microfossils; O-18/O-16; ODP Site 1127; Ocean Drilling Program; Oceanic Cold Reversal; Oxygen; Paleo-oceanography; Paleoclimatology; Paleoecology; Paleotemperature; Planktonic taxa; Pleistocene; Postglacial environment; Protista; Quaternary; Radioactive isotopes; Rotaliina; Sediments; Southern Hemisphere; Southern Ocean; Stable isotopes; Upper Pleistocene; Upper Weichselian; Weichselian; Younger Dryas
Coordinates: S332127 S332127 E1282853 E1282853
Record ID: 2005006562
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands