Wind-driven evolution of the North Pacific subpolar gyre over the last deglaciation

William Robert Gray, Robert CJ Wills, James William Buchanan Rae, Andrea Burke, Ruza F Ivanovic, William HG Roberts, David Ferreira, Paul J Valdes

Research output: Contribution to journalArticlepeer-review

Abstract

North Pacific atmospheric and oceanic circulations are key missing pieces in our understanding of the reorganisation of the global climate system since the Last Glacial Maximum (LGM). Here, using a basin‐wide compilation of planktic foraminiferal δ18O, we show that the North Pacific subpolar gyre extended ~3° further south during the LGM, consistent with sea surface temperature and productivity proxy data. Climate models indicate that the expansion of the subpolar gyre was associated with a substantial gyre strengthening, and that these gyre circulation changes were driven by a southward shift of the mid‐latitude westerlies and increased wind‐stress from the polar easterlies. Using single‐forcing model runs, we show that these atmospheric circulation changes are a non‐linear response to ice‐sheet topography/albedo, and CO2. Our reconstruction indicates that the gyre boundary (and thus westerly winds) began to migrate northward at ~16.5 ka, driving changes in ocean heat transport, biogeochemistry, and North American hydroclimate.
Original languageEnglish
Article numbere2019GL086328
JournalGeophysical Research Letters
Volume47
Issue number6
DOIs
Publication statusPublished - 17 Mar 2020

Keywords

  • North Pacific
  • Deglaciation
  • Gyre circulation
  • Westerlies
  • Oxygen isotopes
  • Climate models

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