The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe
Recent studies have drawn attention to differences in the seasonal impact of the 8.2 ka event, with longer cooler summers and shorter cooler/drier winters. However, there are no data available on the simultaneity or the rate of onset of the seasonal changes in Europe. Based on the microfacies and ge...
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2009
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:31862 2023-05-15T17:31:21+02:00 The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe Prasad, Sushama Witt, Annette Kienel, Ulrike Dulski, Peter Bauer, Eva Yancheva, Gergana 2009 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/31862 https://doi.org/10.1016/j.gloplacha.2009.03.011 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/31862 https://doi.org/10.1016/j.gloplacha.2009.03.011 info:eu-repo/semantics/closedAccess Institut für Physik und Astronomie article doc-type:article 2009 ftubpotsdam https://doi.org/10.1016/j.gloplacha.2009.03.011 2022-07-28T20:44:44Z Recent studies have drawn attention to differences in the seasonal impact of the 8.2 ka event, with longer cooler summers and shorter cooler/drier winters. However, there are no data available on the simultaneity or the rate of onset of the seasonal changes in Europe. Based on the microfacies and geochemical analyses of seasonally laminated varved sediments from Holzmaar, we present evidence of differences in duration and onset time of changes in summer temperature and winter rainfall during the 8.2 ka event. Since both summer and winter climate signals are co-registered within a single varve, there can be no ambiguity about the phasing and duration of the signals. Our data show that the onset and withdrawal of the 8.2 ka summer cooling occurred within a year, and that summer rains were reduced or absent during the investigated period. The onset of cooler summers preceded the onset of winter dryness by ca. 28 years. In view of the differences in nature and duration of the impact of the 8.2 ka event we suggest that a clearer definition of the 8.2 ka event (summer cooling or winter cooling/dryness) needs to be developed. Based on regional comparison and available modelling studies we also discuss the roles of solar variability, changes in North Atlantic Thermohaline circulation, and North Atlantic Circulation (NAO) during the period under consideration. Wavelet analyses of seasonal laminae indicates that the longer NAO cycles, linked to changes in the N. Atlantic temperatures, were more frequent during the drier periods. Article in Journal/Newspaper North Atlantic North atlantic Thermohaline circulation University of Potsdam: publish.UP Global and Planetary Change 67 3-4 218 226 |
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Open Polar |
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University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
Institut für Physik und Astronomie |
spellingShingle |
Institut für Physik und Astronomie Prasad, Sushama Witt, Annette Kienel, Ulrike Dulski, Peter Bauer, Eva Yancheva, Gergana The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
topic_facet |
Institut für Physik und Astronomie |
description |
Recent studies have drawn attention to differences in the seasonal impact of the 8.2 ka event, with longer cooler summers and shorter cooler/drier winters. However, there are no data available on the simultaneity or the rate of onset of the seasonal changes in Europe. Based on the microfacies and geochemical analyses of seasonally laminated varved sediments from Holzmaar, we present evidence of differences in duration and onset time of changes in summer temperature and winter rainfall during the 8.2 ka event. Since both summer and winter climate signals are co-registered within a single varve, there can be no ambiguity about the phasing and duration of the signals. Our data show that the onset and withdrawal of the 8.2 ka summer cooling occurred within a year, and that summer rains were reduced or absent during the investigated period. The onset of cooler summers preceded the onset of winter dryness by ca. 28 years. In view of the differences in nature and duration of the impact of the 8.2 ka event we suggest that a clearer definition of the 8.2 ka event (summer cooling or winter cooling/dryness) needs to be developed. Based on regional comparison and available modelling studies we also discuss the roles of solar variability, changes in North Atlantic Thermohaline circulation, and North Atlantic Circulation (NAO) during the period under consideration. Wavelet analyses of seasonal laminae indicates that the longer NAO cycles, linked to changes in the N. Atlantic temperatures, were more frequent during the drier periods. |
format |
Article in Journal/Newspaper |
author |
Prasad, Sushama Witt, Annette Kienel, Ulrike Dulski, Peter Bauer, Eva Yancheva, Gergana |
author_facet |
Prasad, Sushama Witt, Annette Kienel, Ulrike Dulski, Peter Bauer, Eva Yancheva, Gergana |
author_sort |
Prasad, Sushama |
title |
The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
title_short |
The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
title_full |
The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
title_fullStr |
The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
title_full_unstemmed |
The 8.2 ka event : evidence for seasonal differences and the rate of climate change in western Europe |
title_sort |
8.2 ka event : evidence for seasonal differences and the rate of climate change in western europe |
publishDate |
2009 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/31862 https://doi.org/10.1016/j.gloplacha.2009.03.011 |
genre |
North Atlantic North atlantic Thermohaline circulation |
genre_facet |
North Atlantic North atlantic Thermohaline circulation |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/31862 https://doi.org/10.1016/j.gloplacha.2009.03.011 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2009.03.011 |
container_title |
Global and Planetary Change |
container_volume |
67 |
container_issue |
3-4 |
container_start_page |
218 |
op_container_end_page |
226 |
_version_ |
1766128872744550400 |