The timing, duration and magnitude of the 8.2 ka event in global speleothem records. - OpacWWW

Tytuł:: The timing, duration and magnitude of the 8.2 ka event in global speleothem records.
Autorzy:: Parker SE; School of Archaeology, Geography and Environmental Science, Reading University, Whiteknights, Reading, RG6 6AH, UK. .
Harrison SP; School of Archaeology, Geography and Environmental Science, Reading University, Whiteknights, Reading, RG6 6AH, UK.
Źródło:: Scientific reports [Sci Rep] 2022 Jun 22; Vol. 12 (1), pp. 10542. Date of Electronic Publication: 2022 Jun 22.
Typ publikacji:: Journal Article; Research Support, Non-U.S. Gov't
Język:: English
Imprint Name(s):: Original Publication: London : Nature Publishing Group, copyright 2011-
MeSH Terms:: Climate Change*
Fresh Water*
Asia ; Europe ; Oxygen Isotopes/analysis
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Grant Information:: 694481 International ERC_ European Research Council
Substance Nomenclature:: 0 (Oxygen Isotopes)
Entry Date(s):: Date Created: 20220622 Date Completed: 20220624 Latest Revision: 20221114
Update Code:: 20240105
PubMed Central ID:: PMC9217811
DOI:: 10.1038/s41598-022-14684-y
PMID:: 35732793
: Czasopismo naukowe

Pełny tekst

Abrupt events are a feature of many palaeoclimate records during the Holocene. The best example is the 8.2 ka event, which was triggered by a release of meltwater into the Labrador Sea and resulted in a weakening of poleward heat transport in the North Atlantic. We use an objective method to identify rapid climate events in globally distributed speleothem oxygen isotope records during the Holocene. We show that the 8.2 ka event can be identified in >70% of the speleothem records and is the most coherent signal of abrupt climate change during the last 12,000 years. The isotopic changes during the event are regionally homogenous: positive oxygen isotope anomalies are observed across Asia and negative anomalies are seen across Europe, the Mediterranean, South America and southern Africa. The magnitude of the isotopic excursions in Europe and Asia are statistically indistinguishable. There is no significant difference in the duration and timing of the 8.2 ka event between regions, or between the speleothem records and Greenland ice core records. Our study supports a rapid and global climate response to the 8.2 ka freshwater pulse into the North Atlantic, likely transmitted globally via atmospheric teleconnections.
(© 2022. The Author(s).)

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The timing, duration and magnitude of the 8.2 ka event in global speleothem records.