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

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Version: Author's accepted manuscript
License: All rights reserved
Serval ID
serval:BIB_BEE39F059193
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Massive deposition of Sahelian dust on the Canary Island Lanzarote during North Atlantic Heinrich Events
Journal
Quaternary Research
Author(s)
Heinrich Hartmut, Schmidt Christoph, Ziemen Florian, Mikolajewicz Uwe, Roettig Christopher-Bastian
ISSN
0033-5894
1096-0287
Publication state
Published
Issued date
19/01/2021
Peer-reviewed
Oui
Volume
101
Pages
51-66
Language
english
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.
Keywords
Eolianites, Millennial scale climatic variability, IRSL-dating, Earth system modelling
Create date
25/01/2021 18:54
Last modification date
24/12/2022 6:44
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