Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka
We present new high-resolution pollen records combined with palaeoceanographic proxies from the same samples in deep-sea cores SHAK06-5K and MD01-2444 on the southwestern Iberian Margin, documenting regional vegetation responses to orbital and millennial-scale climate changes over the last 28 ka. Th...
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Online Access: | http://hdl.handle.net/10261/255687 https://doi.org/10.1002/jqs.3392 https://doi.org/10.13039/501100004837 https://api.elsevier.com/content/abstract/scopus_id/85119379978 |
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ftcsic:oai:digital.csic.es:10261/255687 2024-06-23T07:55:18+00:00 Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka Cutmore, Anna Ausín, Blanca Maslin, Mark Eglinton, Timothy Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. Ministerio de Ciencia e Innovación (España) orcid: 2021-11-15 http://hdl.handle.net/10261/255687 https://doi.org/10.1002/jqs.3392 https://doi.org/10.13039/501100004837 https://api.elsevier.com/content/abstract/scopus_id/85119379978 en eng Wiley-Blackwell #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CEX2018-000794-S Journal of Quaternary Science Publisher's version https://doi.org/10.1002/jqs.3392 Sí Journal of Quaternary Science (2021) 02678179 http://hdl.handle.net/10261/255687 doi:10.1002/jqs.3392 http://dx.doi.org/10.13039/501100004837 2-s2.0-85119379978 https://api.elsevier.com/content/abstract/scopus_id/85119379978 open Abrupt climate change Holocene Marine Isotope Stage 2 Pollen Southwest Iberia artículo http://purl.org/coar/resource_type/c_6501 2021 ftcsic https://doi.org/10.1002/jqs.339210.13039/501100004837 2024-05-29T00:00:47Z We present new high-resolution pollen records combined with palaeoceanographic proxies from the same samples in deep-sea cores SHAK06-5K and MD01-2444 on the southwestern Iberian Margin, documenting regional vegetation responses to orbital and millennial-scale climate changes over the last 28 ka. The chronology of these records is based on high-resolution radiocarbon dates of monospecific samples of the planktonic foraminifera Globigerina bulloides, measured from SHAK06-5K and MD01-2444 and aligned using an automated stratigraphical alignment method. Changes in temperate and steppe vegetation during Marine Isotope Stage 2 are closely coupled with sea surface temperature (SST) and global ice-volume changes. The peak expansion of thermophilous woodland between ~10.1 and 8.4 cal ka bp lags behind the boreal summer insolation maximum by ~2 ka, possibly arising from residual high-latitude ice-sheets into the Holocene. Rapid changes in pollen percentages are coeval with abrupt transitions in SSTs, precipitation and winter temperature at the onset and end of Heinrich Stadial 2, the ice-rafted debris event and end of Heinrich Stadial 1, and the onset of the Younger Dryas, suggesting extrinsically forced southwestern Iberian ecosystem changes by abrupt North Atlantic climate events. In contrast, the abrupt decline in thermophilous elements at ~7.8 cal ka bp indicates an intrinsically mediated abrupt vegetation response to the gradually declining boreal insolation, potentially resulting from the crossing of a seasonality of precipitation threshold. Thanks to the Laboratory for Ion Beam Physics, ETH Zürich, for assistance with the 14C measurements, to Janet Hope and Bonnie Atkinson for laboratory support, and to Simon Crowhurst for assistance with the Gaussian Interpolation of the records. A.C. was funded by the Natural Environmental Research Council (NERC grant NE/L002485/1). The authors recognise the critical role of the 2013 James Cook JC089 expedition, led by David Hodell and supported by the National Environmental ... Article in Journal/Newspaper North Atlantic Planktonic foraminifera Digital.CSIC (Spanish National Research Council) Atkinson ENVELOPE(-85.483,-85.483,-78.650,-78.650) Journal of Quaternary Science |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Abrupt climate change Holocene Marine Isotope Stage 2 Pollen Southwest Iberia |
spellingShingle |
Abrupt climate change Holocene Marine Isotope Stage 2 Pollen Southwest Iberia Cutmore, Anna Ausín, Blanca Maslin, Mark Eglinton, Timothy Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
topic_facet |
Abrupt climate change Holocene Marine Isotope Stage 2 Pollen Southwest Iberia |
description |
We present new high-resolution pollen records combined with palaeoceanographic proxies from the same samples in deep-sea cores SHAK06-5K and MD01-2444 on the southwestern Iberian Margin, documenting regional vegetation responses to orbital and millennial-scale climate changes over the last 28 ka. The chronology of these records is based on high-resolution radiocarbon dates of monospecific samples of the planktonic foraminifera Globigerina bulloides, measured from SHAK06-5K and MD01-2444 and aligned using an automated stratigraphical alignment method. Changes in temperate and steppe vegetation during Marine Isotope Stage 2 are closely coupled with sea surface temperature (SST) and global ice-volume changes. The peak expansion of thermophilous woodland between ~10.1 and 8.4 cal ka bp lags behind the boreal summer insolation maximum by ~2 ka, possibly arising from residual high-latitude ice-sheets into the Holocene. Rapid changes in pollen percentages are coeval with abrupt transitions in SSTs, precipitation and winter temperature at the onset and end of Heinrich Stadial 2, the ice-rafted debris event and end of Heinrich Stadial 1, and the onset of the Younger Dryas, suggesting extrinsically forced southwestern Iberian ecosystem changes by abrupt North Atlantic climate events. In contrast, the abrupt decline in thermophilous elements at ~7.8 cal ka bp indicates an intrinsically mediated abrupt vegetation response to the gradually declining boreal insolation, potentially resulting from the crossing of a seasonality of precipitation threshold. Thanks to the Laboratory for Ion Beam Physics, ETH Zürich, for assistance with the 14C measurements, to Janet Hope and Bonnie Atkinson for laboratory support, and to Simon Crowhurst for assistance with the Gaussian Interpolation of the records. A.C. was funded by the Natural Environmental Research Council (NERC grant NE/L002485/1). The authors recognise the critical role of the 2013 James Cook JC089 expedition, led by David Hodell and supported by the National Environmental ... |
author2 |
Ministerio de Ciencia e Innovación (España) orcid: |
format |
Article in Journal/Newspaper |
author |
Cutmore, Anna Ausín, Blanca Maslin, Mark Eglinton, Timothy Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. |
author_facet |
Cutmore, Anna Ausín, Blanca Maslin, Mark Eglinton, Timothy Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. |
author_sort |
Cutmore, Anna |
title |
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
title_short |
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
title_full |
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
title_fullStr |
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
title_full_unstemmed |
Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka |
title_sort |
abrupt intrinsic and extrinsic responses of southwestern iberian vegetation to millennial-scale variability over the past 28 ka |
publisher |
Wiley-Blackwell |
publishDate |
2021 |
url |
http://hdl.handle.net/10261/255687 https://doi.org/10.1002/jqs.3392 https://doi.org/10.13039/501100004837 https://api.elsevier.com/content/abstract/scopus_id/85119379978 |
long_lat |
ENVELOPE(-85.483,-85.483,-78.650,-78.650) |
geographic |
Atkinson |
geographic_facet |
Atkinson |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CEX2018-000794-S Journal of Quaternary Science Publisher's version https://doi.org/10.1002/jqs.3392 Sí Journal of Quaternary Science (2021) 02678179 http://hdl.handle.net/10261/255687 doi:10.1002/jqs.3392 http://dx.doi.org/10.13039/501100004837 2-s2.0-85119379978 https://api.elsevier.com/content/abstract/scopus_id/85119379978 |
op_rights |
open |
op_doi |
https://doi.org/10.1002/jqs.339210.13039/501100004837 |
container_title |
Journal of Quaternary Science |
_version_ |
1802647839269978112 |