Climate of the Past
Climate of the Past
CP
Articles | Volume 18, issue 5
Articles | Volume 18, issue 5
https://doi.org/10.5194/cp-18-1109-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-18-1109-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 5
Research article
 | 
23 May 2022
Research article |  | 23 May 2022

Expression of the “4.2 ka event” in the southern Rocky Mountains, USA

David T. Liefert and Bryan N. Shuman

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Short summary
A large drought potentially occurred roughly 4200 years ago, but its impacts and significance are unclear. We find new evidence in carbonate oxygen isotopes from a mountain lake in southeastern Wyoming, southern Rocky Mountains, of an abrupt reduction in effective moisture (precipitation–evaporation) or snowpack from approximately 4200–4000 years ago. The drought's prominence among a growing number of sites in the North American interior suggests it was a regionally substantial climate event.
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