Climate response to the 8.2 ka event in coastal California
Abstract A fast-growing stalagmite from the central California coast provides a high-resolution record of climatic changes synchronous with global perturbations resulting from the catastrophic drainage of proglacial Lake Agassiz at ca. 8.2 ka. High frequency, large amplitude variations in carbon iso...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2017-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-04215-5 |
| _version_ | 1818851102908481536 |
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| author | Jessica L. Oster Warren D. Sharp Aaron K. Covey Jansen Gibson Bruce Rogers Hari Mix |
| author_facet | Jessica L. Oster Warren D. Sharp Aaron K. Covey Jansen Gibson Bruce Rogers Hari Mix |
| author_sort | Jessica L. Oster |
| collection | DOAJ |
| description | Abstract A fast-growing stalagmite from the central California coast provides a high-resolution record of climatic changes synchronous with global perturbations resulting from the catastrophic drainage of proglacial Lake Agassiz at ca. 8.2 ka. High frequency, large amplitude variations in carbon isotopes during the 8.2 ka event, coupled with pulsed increases in phosphorus concentrations, indicate more frequent or intense winter storms on the California coast. Decreased magnesium-calcium ratios point toward a sustained increase in effective moisture during the event, however the magnitude of change in Mg/Ca suggests this event was not as pronounced on the western North American coast as anomalies seen in the high northern latitudes and monsoon-influenced areas. Nevertheless, shifts in the White Moon Cave record that are synchronous within age uncertainties with cooling of Greenland, and changes in global monsoon systems, suggest rapid changes in atmospheric circulation occurred in response to freshwater input and associated cooling in the North Atlantic region. Our record is consistent with intensification of the Pacific winter storm track in response to North Atlantic freshwater forcing, a mechanism suggested by simulations of the last deglaciation, and indicates this intensification led to increases in precipitation and infiltration along the California coast during the Holocene. |
| first_indexed | 2024-12-19T06:59:42Z |
| format | Article |
| id | doaj.art-0ad635c2ba594349aef110616763c4d7 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-19T06:59:42Z |
| publishDate | 2017-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-0ad635c2ba594349aef110616763c4d72022-12-21T20:31:27ZengNature PortfolioScientific Reports2045-23222017-06-01711910.1038/s41598-017-04215-5Climate response to the 8.2 ka event in coastal CaliforniaJessica L. Oster0Warren D. Sharp1Aaron K. Covey2Jansen Gibson3Bruce Rogers4Hari Mix5Department of Earth and Environmental Sciences, Vanderbilt UniversityBerkeley Geochronology CenterDepartment of Earth and Environmental Sciences, Vanderbilt UniversityDepartment of Earth and Environmental Sciences, Vanderbilt UniversityWestern Cave ConservancyDepartment of Environmental Studies and Sciences, Santa Clara UniversityAbstract A fast-growing stalagmite from the central California coast provides a high-resolution record of climatic changes synchronous with global perturbations resulting from the catastrophic drainage of proglacial Lake Agassiz at ca. 8.2 ka. High frequency, large amplitude variations in carbon isotopes during the 8.2 ka event, coupled with pulsed increases in phosphorus concentrations, indicate more frequent or intense winter storms on the California coast. Decreased magnesium-calcium ratios point toward a sustained increase in effective moisture during the event, however the magnitude of change in Mg/Ca suggests this event was not as pronounced on the western North American coast as anomalies seen in the high northern latitudes and monsoon-influenced areas. Nevertheless, shifts in the White Moon Cave record that are synchronous within age uncertainties with cooling of Greenland, and changes in global monsoon systems, suggest rapid changes in atmospheric circulation occurred in response to freshwater input and associated cooling in the North Atlantic region. Our record is consistent with intensification of the Pacific winter storm track in response to North Atlantic freshwater forcing, a mechanism suggested by simulations of the last deglaciation, and indicates this intensification led to increases in precipitation and infiltration along the California coast during the Holocene.https://doi.org/10.1038/s41598-017-04215-5 |
| spellingShingle | Jessica L. Oster Warren D. Sharp Aaron K. Covey Jansen Gibson Bruce Rogers Hari Mix Climate response to the 8.2 ka event in coastal California Scientific Reports |
| title | Climate response to the 8.2 ka event in coastal California |
| title_full | Climate response to the 8.2 ka event in coastal California |
| title_fullStr | Climate response to the 8.2 ka event in coastal California |
| title_full_unstemmed | Climate response to the 8.2 ka event in coastal California |
| title_short | Climate response to the 8.2 ka event in coastal California |
| title_sort | climate response to the 8 2 ka event in coastal california |
| url | https://doi.org/10.1038/s41598-017-04215-5 |
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