Late‐glacial climatic oscillations as recorded in Swiss lake sediments
Abstract Regional pollen assemblage zones for the late‐glacial period of the Swiss Plateau are introduced and defined. They include four major zones ( Artemisia, Juniperus—Hippophaë, Betula, Pinus PAZ) with several subzones. Pollen and oxygen‐isotope analyses on lacustrine sediments from several lak...
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crwiley:10.1002/jqs.3390070302 2024-06-09T07:46:28+00:00 Late‐glacial climatic oscillations as recorded in Swiss lake sediments Eawag, A. F. Lotter Eicher, U. Siegenthaler, U. Birks, H. J. B. 1992 http://dx.doi.org/10.1002/jqs.3390070302 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390070302 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390070302 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 7, issue 3, page 187-204 ISSN 0267-8179 1099-1417 journal-article 1992 crwiley https://doi.org/10.1002/jqs.3390070302 2024-05-16T14:24:39Z Abstract Regional pollen assemblage zones for the late‐glacial period of the Swiss Plateau are introduced and defined. They include four major zones ( Artemisia, Juniperus—Hippophaë, Betula, Pinus PAZ) with several subzones. Pollen and oxygen‐isotope analyses on lacustrine sediments from several lakes in the area reveal four distinct phases of climatic oscillation in the time period of 13 000‐9500 yr BP. The first oscillation, termed the Aegelsee fluctuation, occurs shortly before 12 000 yr BP and varve counts suggest its duration was ca. 100 yr. It is characterised by a short decrease in the oxygen isotopes as well as a short increase in NAP associated with a depression in birch pollen values. The second oscillation, which occurs in the δ 18 O record shortly before the deposition of the Laacher See Tephra (ca. 11 000 yr BP), is termed the Gerzensee fluctuation. It occurs during a pine‐dominated phase and its vegetational effects cannot be determined palynologically. The most prominent regressive phase is the Younger Dryas biozone (ca. 10 700‐10 000 yr BP) characterised by an increase in heliophilous NAP and low δ 18 O values. The Younger Dryas biozone can often be subdivided palynologically into two parts: a first part rich in grasses and juniper and a second part with higher Filipendula and birch values. During the Preboreal biozone another distinct oscillation is evidenced only in the oxygen isotope ratios. Comparison of the Swiss oxygen isotope profiles with the Greenland Dye 3 record suggests that not only the three major shifts in the δ 18 O curves but also the minor ones are closely comparable, suggesting some common climatic control. Article in Journal/Newspaper Greenland Wiley Online Library Greenland Journal of Quaternary Science 7 3 187 204 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Regional pollen assemblage zones for the late‐glacial period of the Swiss Plateau are introduced and defined. They include four major zones ( Artemisia, Juniperus—Hippophaë, Betula, Pinus PAZ) with several subzones. Pollen and oxygen‐isotope analyses on lacustrine sediments from several lakes in the area reveal four distinct phases of climatic oscillation in the time period of 13 000‐9500 yr BP. The first oscillation, termed the Aegelsee fluctuation, occurs shortly before 12 000 yr BP and varve counts suggest its duration was ca. 100 yr. It is characterised by a short decrease in the oxygen isotopes as well as a short increase in NAP associated with a depression in birch pollen values. The second oscillation, which occurs in the δ 18 O record shortly before the deposition of the Laacher See Tephra (ca. 11 000 yr BP), is termed the Gerzensee fluctuation. It occurs during a pine‐dominated phase and its vegetational effects cannot be determined palynologically. The most prominent regressive phase is the Younger Dryas biozone (ca. 10 700‐10 000 yr BP) characterised by an increase in heliophilous NAP and low δ 18 O values. The Younger Dryas biozone can often be subdivided palynologically into two parts: a first part rich in grasses and juniper and a second part with higher Filipendula and birch values. During the Preboreal biozone another distinct oscillation is evidenced only in the oxygen isotope ratios. Comparison of the Swiss oxygen isotope profiles with the Greenland Dye 3 record suggests that not only the three major shifts in the δ 18 O curves but also the minor ones are closely comparable, suggesting some common climatic control. |
format |
Article in Journal/Newspaper |
author |
Eawag, A. F. Lotter Eicher, U. Siegenthaler, U. Birks, H. J. B. |
spellingShingle |
Eawag, A. F. Lotter Eicher, U. Siegenthaler, U. Birks, H. J. B. Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
author_facet |
Eawag, A. F. Lotter Eicher, U. Siegenthaler, U. Birks, H. J. B. |
author_sort |
Eawag, A. F. Lotter |
title |
Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
title_short |
Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
title_full |
Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
title_fullStr |
Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
title_full_unstemmed |
Late‐glacial climatic oscillations as recorded in Swiss lake sediments |
title_sort |
late‐glacial climatic oscillations as recorded in swiss lake sediments |
publisher |
Wiley |
publishDate |
1992 |
url |
http://dx.doi.org/10.1002/jqs.3390070302 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390070302 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390070302 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Journal of Quaternary Science volume 7, issue 3, page 187-204 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3390070302 |
container_title |
Journal of Quaternary Science |
container_volume |
7 |
container_issue |
3 |
container_start_page |
187 |
op_container_end_page |
204 |
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1801376322500427776 |