Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record
Abrupt changes in Western Mediterranean climate during the last deglaciation (20 to 6 cal ka BP) are detected in marine core MD95-2043 (Alboran Sea) through the investigation of high-resolution pollen data and pollen-based climate reconstructions by the modern analogue technique (MAT) for annual pre...
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ftarchimer:oai:archimer.ifremer.fr:32904 2023-05-15T16:39:23+02:00 Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record Fletcher, W. J. Goni, M. F. Sanchez Peyron, O. Dormoy, I. 2010 application/pdf https://archimer.ifremer.fr/doc/00218/32904/31402.pdf https://doi.org/10.5194/cpd-5-203-2009 https://archimer.ifremer.fr/doc/00218/32904/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00218/32904/31402.pdf doi:10.5194/cpd-5-203-2009 https://archimer.ifremer.fr/doc/00218/32904/ Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2010 , Vol. 6 , N. 2 , P. 245-264 text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.5194/cpd-5-203-2009 2021-09-23T20:25:01Z Abrupt changes in Western Mediterranean climate during the last deglaciation (20 to 6 cal ka BP) are detected in marine core MD95-2043 (Alboran Sea) through the investigation of high-resolution pollen data and pollen-based climate reconstructions by the modern analogue technique (MAT) for annual precipitation (P-ann) and mean temperatures of the coldest and warmest months (MTCO and MTWA). Changes in temperate Mediterranean forest development and composition and MAT reconstructions indicate major climatic shifts with parallel temperature and precipitation changes at the onsets of Heinrich stadial 1 (equivalent to the Oldest Dryas), the Bolling-Allerod (BA), and the Younger Dryas (YD). Multi-centennial-scale oscillations in forest development occurred throughout the BA, YD, and early Holocene. Shifts in vegetation composition and (P-ann reconstructions indicate that forest declines occurred during dry, and generally cool, episodes centred at 14.0, 13.3, 12.9, 11.8, 10.7, 10.1, 9.2, 8.3 and 7.4 cal ka BP. The forest record also suggests multiple, low-amplitude Preboreal (PB) climate oscillations, and a marked increase in moisture availability for forest development at the end of the PB at 10.6 cal ka BP. Dry atmospheric conditions in the Western Mediterranean occurred in phase with Lateglacial events of high-latitude cooling including GI-1d (Older Dryas), GI-1b (Intra-Allerod Cold Period) and GS-1 (YD), and during Holocene events associated with high-latitude cooling, meltwater pulses and N. Atlantic ice-rafting. A possible climatic mechanism for the recurrence of dry intervals and an opposed regional precipitation pattern with respect to Western-central Europe relates to the dynamics of the westerlies and the prevalence of atmospheric blocking highs. Comparison of radiocarbon and ice-core ages for well-defined climatic transitions in the forest record suggests possible enhancement of marine reservoir ages in the Alboran Sea by 200 years (surface water age 600 years) during the Lateglacial. Article in Journal/Newspaper ice core Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Abrupt changes in Western Mediterranean climate during the last deglaciation (20 to 6 cal ka BP) are detected in marine core MD95-2043 (Alboran Sea) through the investigation of high-resolution pollen data and pollen-based climate reconstructions by the modern analogue technique (MAT) for annual precipitation (P-ann) and mean temperatures of the coldest and warmest months (MTCO and MTWA). Changes in temperate Mediterranean forest development and composition and MAT reconstructions indicate major climatic shifts with parallel temperature and precipitation changes at the onsets of Heinrich stadial 1 (equivalent to the Oldest Dryas), the Bolling-Allerod (BA), and the Younger Dryas (YD). Multi-centennial-scale oscillations in forest development occurred throughout the BA, YD, and early Holocene. Shifts in vegetation composition and (P-ann reconstructions indicate that forest declines occurred during dry, and generally cool, episodes centred at 14.0, 13.3, 12.9, 11.8, 10.7, 10.1, 9.2, 8.3 and 7.4 cal ka BP. The forest record also suggests multiple, low-amplitude Preboreal (PB) climate oscillations, and a marked increase in moisture availability for forest development at the end of the PB at 10.6 cal ka BP. Dry atmospheric conditions in the Western Mediterranean occurred in phase with Lateglacial events of high-latitude cooling including GI-1d (Older Dryas), GI-1b (Intra-Allerod Cold Period) and GS-1 (YD), and during Holocene events associated with high-latitude cooling, meltwater pulses and N. Atlantic ice-rafting. A possible climatic mechanism for the recurrence of dry intervals and an opposed regional precipitation pattern with respect to Western-central Europe relates to the dynamics of the westerlies and the prevalence of atmospheric blocking highs. Comparison of radiocarbon and ice-core ages for well-defined climatic transitions in the forest record suggests possible enhancement of marine reservoir ages in the Alboran Sea by 200 years (surface water age 600 years) during the Lateglacial. |
format |
Article in Journal/Newspaper |
author |
Fletcher, W. J. Goni, M. F. Sanchez Peyron, O. Dormoy, I. |
spellingShingle |
Fletcher, W. J. Goni, M. F. Sanchez Peyron, O. Dormoy, I. Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
author_facet |
Fletcher, W. J. Goni, M. F. Sanchez Peyron, O. Dormoy, I. |
author_sort |
Fletcher, W. J. |
title |
Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
title_short |
Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
title_full |
Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
title_fullStr |
Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
title_full_unstemmed |
Abrupt climate changes of the last deglaciation detected in a Western Mediterranean forest record |
title_sort |
abrupt climate changes of the last deglaciation detected in a western mediterranean forest record |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00218/32904/31402.pdf https://doi.org/10.5194/cpd-5-203-2009 https://archimer.ifremer.fr/doc/00218/32904/ |
genre |
ice core |
genre_facet |
ice core |
op_source |
Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2010 , Vol. 6 , N. 2 , P. 245-264 |
op_relation |
https://archimer.ifremer.fr/doc/00218/32904/31402.pdf doi:10.5194/cpd-5-203-2009 https://archimer.ifremer.fr/doc/00218/32904/ |
op_rights |
Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cpd-5-203-2009 |
_version_ |
1766029734761725952 |