Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies
International audience The nature and tempo of Holocene climate variability is examined in the record of forest vegetation from western Mediterranean marine core MD95-2043. Episodes of forest decline occurred at 10.1, 9.2, 8.3, 7.4, 5.4-4.5 and 3.7-2.9 cal. ka BP, and between 1.9 cal. ka BP and the...
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Online Access: | https://hal.science/hal-00861176 https://doi.org/10.1177/0959683612460783hol.sagepub.com |
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ftinsu:oai:HAL:hal-00861176v1 2024-04-14T08:13:51+00:00 Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies Fletcher, W.J. Debret, Maxime Sanchez Goñi, M.F. Université Sciences et Technologies - Bordeaux 1 (UB) University of Manchester Manchester Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.science/hal-00861176 https://doi.org/10.1177/0959683612460783hol.sagepub.com en eng HAL CCSD London: Sage info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683612460783hol.sagepub.com hal-00861176 https://hal.science/hal-00861176 doi:10.1177/0959683612460783hol.sagepub.com ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://hal.science/hal-00861176 The Holocene, 2013, pp.1- 14. ⟨10.1177/0959683612460783hol.sagepub.com⟩ [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2013 ftinsu https://doi.org/10.1177/0959683612460783hol.sagepub.com 2024-03-21T16:56:34Z International audience The nature and tempo of Holocene climate variability is examined in the record of forest vegetation from western Mediterranean marine core MD95-2043. Episodes of forest decline occurred at 10.1, 9.2, 8.3, 7.4, 5.4-4.5 and 3.7-2.9 cal. ka BP, and between 1.9 cal. ka BP and the top of the record (1.3cal. ka BP). Wavelet analysis confirms a ~900 yr periodicity prior to and during the early Holocene and the dominance of a ~1750 yr periodicity after 6 cal. ka BP. The ~900 yr periodicity has counterparts in numerous North Atlantic and Northern Hemisphere palaeoclimate records, and in solar irradiance proxies (Δ14C and 10Be), and may relate to a Sun-climate connection during the early Holocene. Comparisons between the MD95-2043 forest record and strategically located records from Morocco, Iceland, Norway and Israel suggest that the ~1750 yr mid- to late-Holocene oscillation reflects shifts between a prevailing strong and weak state of the zonal flow, with impacts similar to the positive and negative modes of the present-day North Atlantic Oscillation (NAO). The mid- to late-Holocene millennial oscillation in zonal flow appears closely coupled to North Atlantic surface ocean circulation dynamics, and may have been driven by an internal oscillation in deep-water convection strength. The findings suggest that the mid-Holocene transition in western Mediterranean climate was accompanied by a shift in the fundamental tempo of millennial-scale variability, reflecting contrasting sensitivity of the North Atlantic climate system to different forcing factors (solar versus oceanic) under deglacial and fully interglacial conditions. Article in Journal/Newspaper Iceland North Atlantic North Atlantic oscillation Institut national des sciences de l'Univers: HAL-INSU Norway The Holocene 23 2 153 166 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes Fletcher, W.J. Debret, Maxime Sanchez Goñi, M.F. Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The nature and tempo of Holocene climate variability is examined in the record of forest vegetation from western Mediterranean marine core MD95-2043. Episodes of forest decline occurred at 10.1, 9.2, 8.3, 7.4, 5.4-4.5 and 3.7-2.9 cal. ka BP, and between 1.9 cal. ka BP and the top of the record (1.3cal. ka BP). Wavelet analysis confirms a ~900 yr periodicity prior to and during the early Holocene and the dominance of a ~1750 yr periodicity after 6 cal. ka BP. The ~900 yr periodicity has counterparts in numerous North Atlantic and Northern Hemisphere palaeoclimate records, and in solar irradiance proxies (Δ14C and 10Be), and may relate to a Sun-climate connection during the early Holocene. Comparisons between the MD95-2043 forest record and strategically located records from Morocco, Iceland, Norway and Israel suggest that the ~1750 yr mid- to late-Holocene oscillation reflects shifts between a prevailing strong and weak state of the zonal flow, with impacts similar to the positive and negative modes of the present-day North Atlantic Oscillation (NAO). The mid- to late-Holocene millennial oscillation in zonal flow appears closely coupled to North Atlantic surface ocean circulation dynamics, and may have been driven by an internal oscillation in deep-water convection strength. The findings suggest that the mid-Holocene transition in western Mediterranean climate was accompanied by a shift in the fundamental tempo of millennial-scale variability, reflecting contrasting sensitivity of the North Atlantic climate system to different forcing factors (solar versus oceanic) under deglacial and fully interglacial conditions. |
author2 |
Université Sciences et Technologies - Bordeaux 1 (UB) University of Manchester Manchester Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Fletcher, W.J. Debret, Maxime Sanchez Goñi, M.F. |
author_facet |
Fletcher, W.J. Debret, Maxime Sanchez Goñi, M.F. |
author_sort |
Fletcher, W.J. |
title |
Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
title_short |
Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
title_full |
Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
title_fullStr |
Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
title_full_unstemmed |
Mid-Holocene emergence of a lowfrequency millennial oscillation in western Mediterranean climate: Implications for past dynamics of the North Atlantic atmospheric westerlies |
title_sort |
mid-holocene emergence of a lowfrequency millennial oscillation in western mediterranean climate: implications for past dynamics of the north atlantic atmospheric westerlies |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-00861176 https://doi.org/10.1177/0959683612460783hol.sagepub.com |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Iceland North Atlantic North Atlantic oscillation |
genre_facet |
Iceland North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://hal.science/hal-00861176 The Holocene, 2013, pp.1- 14. ⟨10.1177/0959683612460783hol.sagepub.com⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683612460783hol.sagepub.com hal-00861176 https://hal.science/hal-00861176 doi:10.1177/0959683612460783hol.sagepub.com |
op_doi |
https://doi.org/10.1177/0959683612460783hol.sagepub.com |
container_title |
The Holocene |
container_volume |
23 |
container_issue |
2 |
container_start_page |
153 |
op_container_end_page |
166 |
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1796311937285357568 |