What was the 8.2-kiloyear event?
The 8.2-kiloyear event was a rapid drop in global temperatures occurring approximately 8,200 years ago and lasting for two to four centuries. It marks the boundary separating the Greenlandian and Northgrippian ages within the Holocene epoch. During this cooling phase, atmospheric methane levels experienced a measurable reduction, pointing toward broad drying and cooling trends across the Northern Hemisphere.
What we know
- The 8.2-kiloyear event was a rapid drop in global temperatures that lasted between two and four centuries. [2]
- The event marks the beginning of the Northgrippian stage and the end of the Greenlandian age within the Holocene epoch. [1, 2, 4]
- During the event, atmospheric methane levels dropped by 80 parts per billion, reflecting a 15% reduction. [2]
- The Northgrippian age is known for vast cooling driven by disruptions in ocean circulation caused by melting glaciers. [4]
Where to go next
- the bigger pictureHow is the Holocene epoch divided into ages?
- how it workedWhat caused the Northgrippian age cooling?
- compared withWhat was the 4.2-kiloyear event?
- how we knowHow does paleoclimatology track historical climate events?
- whenWhat was the Younger Dryas period?
- an unexpected connectionHow does a temperature drop connect to ancient atmospheric methane?A sudden cooling event in global temperatures is closely mirrored by a sharp 15 percent drop in atmospheric methane levels.
Sources
- [1]8.2 kiloyear event (Wikidata Q1785837) · CC0 1.0
- [2]8.2-kiloyear event · CC BY-SA 4.0
- [3]4.2-kiloyear event · CC BY-SA 4.0
- [4]Holocene · CC BY-SA 4.0
- [5]List of periods and events in climate history · CC BY-SA 4.0
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