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Discussion papers | Copyright
https://doi.org/10.5194/cp-2018-97
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Aug 2018

Research article | 10 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Western Mediterranean hydro-climatic consequences of Holocene iceberg advances (Bond events)

Christoph Zielhofer1, Anne Köhler1, Steffen Mischke2, Abdelfattah Benkaddour3, Abdeslam Mikdad4, and William J. Fletcher5 Christoph Zielhofer et al.
  • 1Institute of Geography, Chair of Physical Geography, Leipzig University, Leipzig, 04103, Germany
  • 2Faculty of Earth Sciences, University of Iceland, Reykjavík, 101, Iceland
  • 3Department of Earth Sciences, Faculty of Science and Technology, Cadi Ayyad University, Marrakech-Guéliz, Morocco
  • 4Institut National des Sciences de l'Archéologie et du Patrimoine, Rabat, Morocco
  • 5Department of Geography, School of Environment, Education and D evelopment, University of Manchester, Manchester, M13 9PL, UK

Abstract. Gerald C. Bond established a Holocene series of North Atlantic ice rafted debris events based on quartz and hematite stained grains recovered from subpolar North Atlantic marine cores. These so-called ‘Bond events’ document nine large-scale and multi-centennial North-Atlantic cooling phases that might be linked to a reduced thermohaline circulation. Regardless of the high prominence of the Holocene North Atlantic ice rafted debris record, there are critical scientific comments on the study: the Holocene Bond curve has not yet been replicated in other marine archives of the North Atlantic and there exist only very few palaeo-climatic studies that indicate all individual Bond events in their own record. Therefore, evidence for consistent hydro-climatic teleconnections between the subpolar North Atlantic and distant regions is not clear. In this context, the Western Mediterranean region reveals key hydro-climatic sites for the reconstruction of a teleconnection with the subpolar North Atlantic. In particular, variability of Western Mediterranean winter precipitation might be the result of atmosphere-ocean coupled processes in the outer-tropical North Atlantic realm.

Based on an improved Holocene δ18O record from Lake Sidi Ali (Middle Atlas, Morocco) we correlate Western Mediterranean precipitation anomalies with North Atlantic Bond events to identify a probable teleconnection between Western Mediterranean winter rains and subpolar North Atlantic cooling phases. Our data show a noticeable positive correlation between Western Mediterranean winter rain minima and Bond events during the Early Holocene and an opposite pattern during the Late Holocene. There is evidence for an enduring hydro-climatic change in the overall Atlantic atmosphere-ocean system and the response to external forcing during the Mid-Holocene. Regarding a potential climatic anomaly around 4.2ka (Bond event 3) in the Western Mediterranean, a centennial-scale winter rain maximum is generally in phase with the overall pattern of alternating ‘wet and cool’ and ‘dry and warm’ intervals during the last 5,000 years.

Christoph Zielhofer et al.
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