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Oldest Dryas hydroclimate reorganization in the eastern Iberian Peninsula after the iceberg discharges of Heinrich Event 1

Published online by Cambridge University Press:  13 January 2021

Carlos Pérez-Mejías Open the ORCID record for Carlos Pérez-Mejías [Opens in a new window] ,
Ana Moreno ,
Juan Bernal-Wormull ,
Isabel Cacho ,
M. Cinta Osácar ,
R. Lawrence Edwards  and
Hai Cheng
Carlos Pérez-Mejías*
Affiliation:
Institute of Global Environmental Change, Xi'an Jiaotong University, 710049 Xi'an, China
Ana Moreno
Affiliation:
Department of Geoenvironmental Processes and Global Change, Pyrenean Institute of Ecology–CSIC, Avda. Montañana 1005, 50059Zaragoza, Spain
Juan Bernal-Wormull
Affiliation:
Department of Geoenvironmental Processes and Global Change, Pyrenean Institute of Ecology–CSIC, Avda. Montañana 1005, 50059Zaragoza, Spain
Isabel Cacho
Affiliation:
Department of Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona. C/Martí Franques s/n, 08028Barcelona, Spain
M. Cinta Osácar
Affiliation:
Earth Sciences Department, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
R. Lawrence Edwards
Affiliation:
Department of Earth and Environmental Sciences, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota55455, USA
Hai Cheng
Affiliation:
Institute of Global Environmental Change, Xi'an Jiaotong University, 710049 Xi'an, China State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710049 Xi'an, China Key Laboratory of Karst Dynamics, MLR, Institute of Karst Geology, CAGS, Guilin, China
*
*Corresponding author at: Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China. Email address: [email protected].
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Abstract

This study examines the first precisely dated and temporally highly resolved speleothem record from Iberia that reconstructs the Oldest Dryas (OD). The onset of cold conditions in the study area, contemporary with the beginning of Heinrich Stadial 1, is recorded at 18.13 ± 0.08 ka, with a pronounced drop of 6.1‰ in δ13C in 250 years. Henceforth, stadial conditions depict a period of instability in the Atlantic Meridional Overturning Circulation, peaking in freshwater input from iceberg melting during Heinrich Event 1. Anomalies in the δ18O of the stalagmite attributed to such a freshwater event are found from 16.17 to 15.89 ka. Such absolute dates given to the onset of the OD in Iberia and to the main iceberg discharges are reliable anchor points for non-absolute chronologies. Two periods are identified in the OD: OD-a (18.13–16.17 ka) is characterized by wet conditions and a faster growth rate, and OD-b (15.89–14.81 ka) exhibits relative dryness and a slower growth rate. The sudden release of fresh water is considered to be the reason for the disruption of rainfall patterns in eastern Iberia. The present study also highlights the existence of heterogeneous and complex hydrological conditions during the OD in Iberia when both Atlantic and Mediterranean realms are considered.

Keywords

SpeleothemDeglaciationHeinrich Stadial 1Oldest DryasIberiaWestern MediterraneanAtlantic Meridional Overturning Circulation
Type
Thematic Set: Heinrich Events
Information
Quaternary Research , Volume 101 , May 2021 , pp. 67 - 83
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Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2021

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