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- PP21D-0970: Increased Moisture in Northern California During Heinrich Stadial 4
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Board 0970‚ Hall EFG (Poster Hall)NOLA CC
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Claire Arney, Vanderbilt University (First Author, Presenting Author)
Erica Scarpitti, Vanderbilt University
Haolun Jiang, Vanderbilt University
Bryce Belanger, Vanderbilt University
Lilian Pendergrass, Vanderbilt University
Jessica Oster, Vanderbilt University
Warren Sharp, Berkeley Geochronology Center
In the last glacial period, the North Atlantic experienced so-called Heinrich Stadials – events associated with increased iceberg flux into the ocean, colder temperatures, and increased amounts of atmospheric CO2. Until recently, the global impacts of the Heinrich Stadials have not been understood. Here, we reveal our findings that the Heinrich Stadials impacted the climate in Western North America, using stalagmites (rocks that grow on the bottom of caves from drip water) from Lake Shasta Caverns in Northern California. The chemical composition of these stalagmites serves as climate proxies, reflecting changes in temperature and precipitation in the climate above the cave from thousands of years ago. These proxies suggest that the climate above Lake Shasta Caverns experienced wetter and colder conditions during the 4th Stadial, as compared to the standard conditions during the last glacial period. These results are analogous to the climate changes above Lake Shasta Caverns during the 1st Stadial which are recorded in another stalagmite and bolster current knowledge of Stadial impacts and trends. Furthermore, the changes in our stalagmite correspond to similar changes in Brazilian and Chinese stalagmites, demonstrating the global extent of the Heinrich Stadials’ impacts.
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