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AGU: Paleoceanography

 

Keywords

  • Black Sea
  • GDGT
  • Younger Dryas
  • abrupt climate changes
  • glacial
  • temperature

Index Terms

  • 1055 - Organic and biogenic geochemistry
  • 4901 - Abrupt/rapid climate change
  • 4914 - Continental climate records
  • 4926 - Glacial
  • 4954 - Sea surface temperature

Paper in Press

PALEOCEANOGRAPHY, doi:10.1029/2012PA002291

A precise search for drastic temperature shifts of the past 40,000 years in southeastern Europe

Key Points
  • Millennial SST in SE Europe on 40 kyrs from TEX86 index
  • Stable glacial SSTs with shifts during HE events and none for DO events
  • 10 degreeC warming during deglaciation and 6 degreeC YD cooling

Authors:

Guillemette Ménot

Edouard Bard

Climatic models simulate abrupt oscillations that are associated, in the North Atlantic, with Dansgaard-Oeschger and Heinrich events since the last glacial period very well. However, the geographic extension of temperature anomalies is largely uncontrolled due to the scarcity of quantitative records of sufficient time resolution on the European continent. Here, we propose, based on a recently developed temperature proxy (TEX86), a reconstruction of millennial-scale temperature variations in a Black Sea sediment archive for the last 40,000 years. Prior to any paleoclimatological interpretations the effects of potential bias, such as seasonality and the depth of maximum export production on temperature reconstructions, are considered for the Black Sea. Based on previous work, a tentative method for temperature corrections, taking into account varying terrigenous inputs, is further proposed. Reconstructed temperatures for Black Sea core MD042790 were remarkably stable during the last glacial. However, significant shifts toward lower temperatures of 2{degree sign}C occurred during Heinrich events 2 and 3. The deglaciation displayed a temperature increase of 10{degree sign}C consistent with neighboring European reconstructions. A Younger Dryas cooling of approximately 5-6{degree sign}C was clearly expressed in the reconstruction. In notable contrast to observations from nearby archives, Heinrich events imprinted our glacial temperature record, consistent with a strong reorganization of oceanic circulation and a large spreading of the temperature anomaly from the North Atlantic toward the south-east. Furthermore, in contrast to high latitude records, our Black Sea record lacks of the signatures of Dansgaard-Oeschger interstadials suggesting a decreasing temperature gradient away from the North Atlantic.

Received 26 January 2012; accepted 13 April 2012.

Citation: Ménot, G. and E. Bard (2012), A precise search for drastic temperature shifts of the past 40,000 years in southeastern Europe, Paleoceanography, doi:10.1029/2012PA002291, in press.