High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems
Two abrupt shifts in d18O and trace element contents of a stalagmite from the northwestern European continent (southern Belgium) suggest that two cold anomalies occurred beginning at 8.4±0.04 and ending at 8.15±0.03, possibly reflecting climatic effects associated with the 8.2 ka event. The younger...
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ftorbi:oai:orbi.ulg.ac.be:2268/213615 2024-04-21T08:07:52+00:00 High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems Allan, Mohammed verhyden, sophie Fagel, Nathalie 2017-08-24 https://orbi.uliege.be/handle/2268/213615 en eng https://orbi.uliege.be/handle/2268/213615 info:hdl:2268/213615 Summer School on Speleothem Science 2017, Burgos, Spain [ES], 21st – 26th August 2017 Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique lecture http://purl.org/coar/resource_type/c_8544 info:eu-repo/semantics/lecture 2017 ftorbi 2024-03-27T14:48:14Z Two abrupt shifts in d18O and trace element contents of a stalagmite from the northwestern European continent (southern Belgium) suggest that two cold anomalies occurred beginning at 8.4±0.04 and ending at 8.15±0.03, possibly reflecting climatic effects associated with the 8.2 ka event. The younger of the two anomalies lasted about 30 years, from 8.18 to 8.15±0.03 ka, with a maximum d18O amplitude of 1.4‰. Trace element (Sr, Ba and Mg) peaks coincide with this second drop of d18O. The anomaly initiation is marked by Sr, Ba and Mg concentration peaks suggesting drier conditions during the coldest years, consistent with previous research in the North Atlantic. The earlier anomaly in trace element, d18O records is associated with generally cold but wet conditions at 8.4 ka, lasted 50 years, and ended abruptly. The interval from 8.4 ka to 8.15 ka was less favorable for speleothem deposition, with denser speleothem calcite deposition and lower growth rate, consistent with a cold, dry climate. The clear recovery in both temperature and rainfall between after both anomalies (8.2 and 8.4 ka), suggests that these anomalies are distinct, and may represent two episodes of AMOC weaking related to the drainage of proglacial lakes Agassiz and Ojibway. Lecture North Atlantic University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Allan, Mohammed verhyden, sophie Fagel, Nathalie High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
Two abrupt shifts in d18O and trace element contents of a stalagmite from the northwestern European continent (southern Belgium) suggest that two cold anomalies occurred beginning at 8.4±0.04 and ending at 8.15±0.03, possibly reflecting climatic effects associated with the 8.2 ka event. The younger of the two anomalies lasted about 30 years, from 8.18 to 8.15±0.03 ka, with a maximum d18O amplitude of 1.4‰. Trace element (Sr, Ba and Mg) peaks coincide with this second drop of d18O. The anomaly initiation is marked by Sr, Ba and Mg concentration peaks suggesting drier conditions during the coldest years, consistent with previous research in the North Atlantic. The earlier anomaly in trace element, d18O records is associated with generally cold but wet conditions at 8.4 ka, lasted 50 years, and ended abruptly. The interval from 8.4 ka to 8.15 ka was less favorable for speleothem deposition, with denser speleothem calcite deposition and lower growth rate, consistent with a cold, dry climate. The clear recovery in both temperature and rainfall between after both anomalies (8.2 and 8.4 ka), suggests that these anomalies are distinct, and may represent two episodes of AMOC weaking related to the drainage of proglacial lakes Agassiz and Ojibway. |
format |
Lecture |
author |
Allan, Mohammed verhyden, sophie Fagel, Nathalie |
author_facet |
Allan, Mohammed verhyden, sophie Fagel, Nathalie |
author_sort |
Allan, Mohammed |
title |
High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
title_short |
High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
title_full |
High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
title_fullStr |
High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
title_full_unstemmed |
High-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems |
title_sort |
high-resolution reconstruction of 8.2 ka event recorded in belgian holocene speleothems |
publishDate |
2017 |
url |
https://orbi.uliege.be/handle/2268/213615 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Summer School on Speleothem Science 2017, Burgos, Spain [ES], 21st – 26th August 2017 |
op_relation |
https://orbi.uliege.be/handle/2268/213615 info:hdl:2268/213615 |
_version_ |
1796947960711348224 |