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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fttriple:oai:gotriple.eu:10670/1.17zsbo 2023-05-15T17:34:34+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 Hodell, David Muschitiello, Francesco Menviel, Laurie Haghipour, Negar Martrat, Belen Margari, Vasiliki Tzedakis, Polychronis C. 2021-01-01 https://doi.org/10.1002/jqs.3392 https://archimer.ifremer.fr/doc/00734/84593/89684.pdf https://archimer.ifremer.fr/doc/00734/84593/89685.docx en eng Wiley doi:10.1002/jqs.3392 10670/1.17zsbo https://archimer.ifremer.fr/doc/00734/84593/89684.pdf https://archimer.ifremer.fr/doc/00734/84593/89685.docx Archimer, archive institutionnelle de l'Ifremer Journal of Quaternary Science (0267-8179) (Wiley) In Press anthro-bio geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2021 fttriple https://doi.org/10.1002/jqs.3392 2023-01-22T16:34:58Z 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. Text North Atlantic Planktonic foraminifera Unknown Journal of Quaternary Science 37 3 420 440 |
institution |
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Unknown |
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language |
English |
topic |
anthro-bio geo |
spellingShingle |
anthro-bio geo 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 |
anthro-bio geo |
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. |
format |
Text |
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 |
publishDate |
2021 |
url |
https://doi.org/10.1002/jqs.3392 https://archimer.ifremer.fr/doc/00734/84593/89684.pdf https://archimer.ifremer.fr/doc/00734/84593/89685.docx |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Archimer, archive institutionnelle de l'Ifremer Journal of Quaternary Science (0267-8179) (Wiley) In Press |
op_relation |
doi:10.1002/jqs.3392 10670/1.17zsbo https://archimer.ifremer.fr/doc/00734/84593/89684.pdf https://archimer.ifremer.fr/doc/00734/84593/89685.docx |
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_ |
1766133456007331840 |