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Using Generative Art to Convey Past and Future Climate Transitions
Published on: March 31, 2023
Southern Hemisphere and deep-sea warming led deglacial atmospheric CO2 rise and tropical warming
Lowell Stott1, Axel Timmermann, Robert Thunell
1Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA. stott@usc.edu
Abstract:
Establishing what caused Earth's largest climatic changes in the past requires a precise knowledge of both the forcing and the regional responses. We determined the chronology of high- and low-latitude climate change at the last glacial termination by radiocarbon dating benthic and planktonic foraminiferal stable isotope and magnesium/calcium records from a marine core collected in the western tropical Pacific. Deep-sea temperatures warmed by approximately 2 degrees C between 19 and 17 thousand years before the present (ky B.P.), leading the rise in atmospheric CO2 and tropical-surface-ocean warming by approximately 1000 years. The cause of this deglacial deep-water warming does not lie within the tropics, nor can its early onset between 19 and 17 ky B.P. be attributed to CO2 forcing. Increasing austral-spring insolation combined with sea-ice albedo feedbacks appear to be the key factors responsible for this warming.
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