Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial‐scale variability over the past 28 ka
ABSTRACT 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...
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Online Access: | http://dx.doi.org/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3392 |
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crwiley:10.1002/jqs.3392 2024-06-23T07:55:12+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. Natural Environment Research Council 2021 http://dx.doi.org/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3392 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Quaternary Science volume 37, issue 3, page 420-440 ISSN 0267-8179 1099-1417 journal-article 2021 crwiley https://doi.org/10.1002/jqs.3392 2024-06-04T06:46:35Z ABSTRACT 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. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Wiley Online Library Journal of Quaternary Science 37 3 420 440 |
institution |
Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT 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. |
author2 |
Natural Environment Research Council |
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. |
spellingShingle |
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 |
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 |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3392 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3392 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Journal of Quaternary Science volume 37, issue 3, page 420-440 ISSN 0267-8179 1099-1417 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/jqs.3392 |
container_title |
Journal of Quaternary Science |
container_volume |
37 |
container_issue |
3 |
container_start_page |
420 |
op_container_end_page |
440 |
_version_ |
1802647679049662464 |