Subglacial precipitates record Antarctic ice sheet response to late Pleistocene millennial climate cycles
Gavin Piccione (gpiccion@ucsc.edu),
Terrence Blackburn,
Slawek Tulaczyk,
E. Troy Rasbury,
Mathis P. Hain,
Daniel E. Ibarra,
Katharina Methner,
Chloe Tinglof,
Brandon Cheney,
Paul Northrup and
Kathy Licht
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Gavin Piccione: University of California Santa Cruz
Terrence Blackburn: University of California Santa Cruz
Slawek Tulaczyk: University of California Santa Cruz
E. Troy Rasbury: Stony Brook University
Mathis P. Hain: University of California Santa Cruz
Daniel E. Ibarra: University of California Berkeley
Katharina Methner: Stanford University
Chloe Tinglof: University of California Santa Cruz
Brandon Cheney: University of California Santa Cruz
Paul Northrup: Stony Brook University
Kathy Licht: Indiana University-Purdue University Indianapolis
Nature Communications, 2022, vol. 13, issue 1, 1-14
Abstract:
Abstract Ice cores and offshore sedimentary records demonstrate enhanced ice loss along Antarctic coastal margins during millennial-scale warm intervals within the last glacial termination. However, the distal location and short temporal coverage of these records leads to uncertainty in both the spatial footprint of ice loss, and whether millennial-scale ice response occurs outside of glacial terminations. Here we present a >100kyr archive of periodic transitions in subglacial precipitate mineralogy that are synchronous with Late Pleistocene millennial-scale climate cycles. Geochemical and geochronologic data provide evidence for opal formation during cold periods via cryoconcentration of subglacial brine, and calcite formation during warm periods through the addition of subglacial meltwater originating from the ice sheet interior. These freeze-flush cycles represent cyclic changes in subglacial hydrologic-connectivity driven by ice sheet velocity fluctuations. Our findings imply that oscillating Southern Ocean temperatures drive a dynamic response in the Antarctic ice sheet on millennial timescales, regardless of the background climate state.
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33009-1
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DOI: 10.1038/s41467-022-33009-1
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