High-latitude warming initiated the onset of the last deglaciation in the tropics

Jackson, Margaret S.; Kelly, Meredith A.; Russell, James M.; Doughty, Alice M.; Howley, Jennifer A.; Chipman, Jonathan W.; Cavagnaro, David; Nakileza, Bob; Zimmerman, Susan R.  H.

doi:10.1126/sciadv.aaw2610

Title: High-latitude warming initiated the onset of the last deglaciation in the tropics

Journal Article · 01 December 2019 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aaw2610 · OSTI ID:1626013

^[1];

^[2]; Russell, James M. ^[3]; Doughty, Alice M. ^[4];

^[2];

^[5]; Zimmerman, Susan R. H. ^[6]

Dartmouth College, Hanover, NH (United States). Dept. of Earth Sciences; DOE/OSTI
Dartmouth College, Hanover, NH (United States). Dept. of Earth Sciences
Brown Univ., Providence, RI (United States). Dept. of Earth, Environmental, and Planetary Sciences
Dartmouth College, Hanover, NH (United States). Dept. of Earth Sciences; Bates College, Lewiston, ME (United States). Geology Dept.
Makerere Univ., Kampala (Uganda). Mountain Resource Centre
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry

Atmospheric greenhouse gas concentrations are thought to have synchronized global temperatures during Pleistocene glacial–interglacial cycles, yet their impact relative to changes in high-latitude insolation and ice-sheet extent remains poorly constrained. Here, we use tropical glacial fluctuations to assess the timing of low-latitude temperature changes relative to global climate forcings. We report ¹⁰Be ages of moraines in tropical East Africa and South America and show that glaciers reached their maxima at ~29 to 20 ka, during the global Last Glacial Maximum. Tropical glacial recession was underway by 20 ka, before the rapid CO₂ rise at ~18.2 ka. This “early” tropical warming was influenced by rising high-latitude insolation and coincident ice-sheet recession in both polar regions, which lowered the meridional thermal gradient and reduced tropical heat export to the high latitudes.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: Comer Family Foundation; National Geographic Society; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1626013

Report Number(s):: LLNL-JRNL-759653

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 12 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Title: High-latitude warming initiated the onset of the last deglaciation in the tropics

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