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...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11850/517079 https://doi.org/10.3929/ethz-b-000517079 |
id |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/517079 |
---|---|
record_format |
openpolar |
spelling |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/517079 2023-05-15T17:35:15+02:00 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 I. Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. 2022-04 application/application/pdf https://hdl.handle.net/20.500.11850/517079 https://doi.org/10.3929/ethz-b-000517079 en eng Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/jqs.3392 info:eu-repo/semantics/altIdentifier/wos/000718564900001 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/517079 doi:10.3929/ethz-b-000517079 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Quaternary Science, 37 (3) abrupt climate change Holocene Marine Isotope Stage 2 pollen southwest Iberia info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftethz https://doi.org/20.500.11850/517079 https://doi.org/10.3929/ethz-b-000517079 https://doi.org/10.1002/jqs.3392 2023-02-13T01:00:23Z 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 similar to 10.1 and 8.4 cal ka BP lags behind the boreal summer insolation maximum by similar to 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 similar to 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. (C) 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons, Ltd. ISSN:0267-8179 ISSN:1099-1417 Article in Journal/Newspaper North Atlantic Planktonic foraminifera ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
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 I. 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 similar to 10.1 and 8.4 cal ka BP lags behind the boreal summer insolation maximum by similar to 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 similar to 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. (C) 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons, Ltd. ISSN:0267-8179 ISSN:1099-1417 |
format |
Article in Journal/Newspaper |
author |
Cutmore, Anna Ausín, Blanca Maslin, Mark Eglinton, Timothy I. 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 I. 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 |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11850/517079 https://doi.org/10.3929/ethz-b-000517079 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Journal of Quaternary Science, 37 (3) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/jqs.3392 info:eu-repo/semantics/altIdentifier/wos/000718564900001 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/517079 doi:10.3929/ethz-b-000517079 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/517079 https://doi.org/10.3929/ethz-b-000517079 https://doi.org/10.1002/jqs.3392 |
_version_ |
1766134344296955904 |