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Massive deposition of Sahelian dust on the Canary Island Lanzarote during North Atlantic Heinrich Events

Published online by Cambridge University Press:  19 January 2021

Hartmut Heinrich*
Affiliation:
10°E maritime consulting, Falkenburger Ring 4, 22147Hamburg
Christoph Schmidt
Affiliation:
University of Bayreuth and Géopolis - Office 4414, Université de Lausanne, 1015Lausanne
Florian Ziemen
Affiliation:
Max-Planck-Institut für Meteorologie Hamburg and Deutsches Klimarechenzentrum GmbH (DKRZ), Bundesstraße 45 a, 20146Hamburg
Uwe Mikolajewicz
Affiliation:
Max-Planck-Institut für Meteorologie Hamburg, Bundesstr. 53, 20146Hamburg
Christopher-Bastian Roettig
Affiliation:
Institut für Geographie, Technische Universität Dresden, Helmholtzstraße 10, 01069Dresden
*
Corresponding author at e-mail: [email protected] (H. Heinrich)

Abstract

New IRSL ages of eolianites close to Muñique (Lanzarote) demonstrate the influence of millennial scale climatic variability on the sedimentary dynamics on the Canary Islands during the last glacial cycle. The repetitive succession of interstadial and stadial climatic conditions formed multiple sequences of eolian deposits, each in general comprising three depositional types. DepoType 1 and DepoType 2 consist mainly of marine biogenic carbonate detritus with small amounts of dust from the Sahara representing interstadial conditions. DepoType 2 compared to DepoType 1 is characterized by larger amounts of land snails and calcified brood cells. A DepoType 3 rich in dust from African subtropical/tropical Latisols terminates a sequence. IRSL dating on DepoType 3 type deposits clearly shows that these were deposited during Heinrich Events under stadial conditions. The stadial cooling of the North Atlantic Ocean caused a southern shift of climate zones that culminated during Heinrich Events when the arctic climate reaches its most southerly extent. As a consequence, atmospheric changes led to massive dust supply from the then-dry Sahel. The increase in dust and precipitation from the dry DepoTypes 1 to the more humid DepoTypes 3 originates from a modified atmospheric dynamic during a millennial cycle.

Type
Thematic Set: Heinrich Events
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2021

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