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

Carlos Pérez-Mejiás; Ana Moreno; Juan Bernal-Wormull; Isabel Cacho; M. Cinta Osácar; R. Lawrence Edwards; Hai Cheng

doi:10.1017/qua.2020.112

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

Carlos Pérez-Mejiás, Ana Moreno, Juan Bernal-Wormull, Isabel Cacho, M. Cinta Osácar, R. Lawrence Edwards, Hai Cheng

Research output: Contribution to journal › Review article › peer-review

9 Scopus citations

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.

Original language	English (US)
Pages (from-to)	67-83
Number of pages	17
Journal	Quaternary Research (United States)
Volume	101
DOIs	https://doi.org/10.1017/qua.2020.112
State	Published - May 2021
Externally published	Yes

Bibliographical note

Funding Information:
We acknowledge funding received from NSFC 41888101 to Cheng and Pérez-Mejías; NSF grant 1702816 to Lawrence Edwards and Cheng; and CGL2016-77479-R (SPYRIT) and CTM2016-75411-R (CHIMERA) to Moreno and Cacho, respectively. The authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, University of Zaragoza, and the help of all those involved during the field work. This is a contribution of the research groups “Procesos geoambientales y cambio global” (E02_17R) and “Geotransfer” (E32_17R and E32_20R) from the Aragón Government, Pyrenean Institute of Ecology, and University of Zaragoza. We thank the senior editor, Lewis Owen, the guest editor, Dominik Faust, and the two anonymous reviewers for the constructive comments that improved the manuscript.

Publisher Copyright:
Copyright © University of Washington. Published by Cambridge University Press, 2021.

Keywords

Atlantic Meridional Overturning Circulation
Deglaciation
Heinrich Stadial 1
Iberia
Oldest Dryas
Speleothem
Western Mediterranean

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

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 = "Atlantic Meridional Overturning Circulation, Deglaciation, Heinrich Stadial 1, Iberia, Oldest Dryas, Speleothem, Western Mediterranean",

author = "Carlos P{\'e}rez-Meji{\'a}s and Ana Moreno and Juan Bernal-Wormull and Isabel Cacho and Os{\'a}car, {M. Cinta} and Edwards, {R. Lawrence} and Hai Cheng",

note = "Funding Information: We acknowledge funding received from NSFC 41888101 to Cheng and P{\'e}rez-Mej{\'i}as; NSF grant 1702816 to Lawrence Edwards and Cheng; and CGL2016-77479-R (SPYRIT) and CTM2016-75411-R (CHIMERA) to Moreno and Cacho, respectively. The authors would like to acknowledge the use of Servicio General de Apoyo a la Investigaci{\'o}n-SAI, University of Zaragoza, and the help of all those involved during the field work. This is a contribution of the research groups “Procesos geoambientales y cambio global” (E02_17R) and “Geotransfer” (E32_17R and E32_20R) from the Arag{\'o}n Government, Pyrenean Institute of Ecology, and University of Zaragoza. We thank the senior editor, Lewis Owen, the guest editor, Dominik Faust, and the two anonymous reviewers for the constructive comments that improved the manuscript. Publisher Copyright: Copyright {\textcopyright} University of Washington. Published by Cambridge University Press, 2021.",

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AU - Pérez-Mejiás, Carlos

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AU - Bernal-Wormull, Juan

AU - Cacho, Isabel

AU - Osácar, M. Cinta

AU - Edwards, R. Lawrence

AU - Cheng, Hai

N1 - Funding Information: We acknowledge funding received from NSFC 41888101 to Cheng and Pérez-Mejías; NSF grant 1702816 to Lawrence Edwards and Cheng; and CGL2016-77479-R (SPYRIT) and CTM2016-75411-R (CHIMERA) to Moreno and Cacho, respectively. The authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, University of Zaragoza, and the help of all those involved during the field work. This is a contribution of the research groups “Procesos geoambientales y cambio global” (E02_17R) and “Geotransfer” (E32_17R and E32_20R) from the Aragón Government, Pyrenean Institute of Ecology, and University of Zaragoza. We thank the senior editor, Lewis Owen, the guest editor, Dominik Faust, and the two anonymous reviewers for the constructive comments that improved the manuscript. Publisher Copyright: Copyright © University of Washington. Published by Cambridge University Press, 2021.

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N2 - 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.

AB - 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.

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KW - Deglaciation

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KW - Iberia

KW - Oldest Dryas

KW - Speleothem

KW - Western Mediterranean

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JO - Quaternary Research (United States)

JF - Quaternary Research (United States)

ER -

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

Abstract

Bibliographical note

Keywords

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