White Moon Cave, California 8.2ka Speleothem Stable Isotope Data Oster, J.L.; Sharp, W.D.; Covey, A.K.; Gibson, J.; Rogers, B.; Mix, H. Oster, J.L. Sharp, W.D. Covey, A.K. Gibson, J. Rogers, B. Mix, H. Meridional Overturning Circulation (MOC) earth science/paleoclimate/speleothems (delta 13C,calcite,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (depth,null,null,centimeter,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (delta 18O,calcite,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (White Moon Cave>LATITUDE 37>LONGITUDE -122.183) 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. STUDY NOTES: Stable isotope (d13C and d18O) data from a stalagmite collected in White Moon Cave, California for the 8.2ka climate event NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Oster, J.L. Investigator : Sharp, W.D. Investigator : Covey, A.K. Investigator : Gibson, J. Investigator : Rogers, B. Investigator : Mix, H. 2017-06-20 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22270 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/california/whitemoon2017iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/california/whitemoon2017iso.txt English https://www.ncdc.noaa.gov/paleo/study/22270 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/usa/california/whitemoon2017iso.txt Jessica L. Oster, Warren D. Sharp, Aaron K. Covey, Jansen Gibson, Bruce Rogers, and Hari Mix2017Climate response to the 8.2 ka event in coastal CaliforniaScientific Reports3886710.1038/s41598-017-04215-5https://www.nature.com/articles/s41598-017-04215-5 START YEAR: 8604 cal yr BP * END YEAR: 6926 cal yr BP -122.183 37 -122.183 37