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Regional and global forcing of glacier retreat during the last deglaciation

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https://ir.library.oregonstate.edu/concern/articles/8w32r722x

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  • The ongoing retreat of glaciers globally is one of the clearest manifestations of recent global warming associated with rising greenhouse gas concentrations. By comparison, the importance of greenhouse gases in driving glacier retreat during the most recent deglaciation, the last major interval of global warming, is unclear due to uncertainties in the timing of retreat around the world. Here we use recently improved cosmogenic-nuclide production-rate calibrations to recalculate the ages of 1,116 glacial boulders from 195 moraines that provide broad coverage of retreat in mid-to-low-latitude regions. This revised history, in conjunction with transient climate model simulations, suggests that while several regional-scale forcings, including insolation, ice sheets and ocean circulation, modulated glacier responses regionally, they are unable to account for global-scale retreat, which is most likely related to increasing greenhouse gas concentrations.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Nature Publishing Group. The published article can be found at: http://www.nature.com/ncomms/2015/150821/ncomms9059/full/ncomms9059.html
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  • Shakun, J. D., Clark, P. U., He, F., Lifton, N. A., Liu, Z., & Otto-Bliesner, B. L. (2015). Regional and global forcing of glacier retreat during the last deglaciation. Nature Communications, 6, 8059. doi:10.1038/ncomms9059
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  • 6
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  • We acknowledge the researchers who generated the data included in our synthesis. J.D.S. and F.H. were supported in part by the NOAA Climate and Global Change Postdoctoral Fellowship program. P.U.C. was supported by the US NSF Global Change Program (EAR 1304909). F.H. was supported by the US NSF (AGS-1203430). This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. The CCSM project is supported by the National Science Foundation and the Office of Science (Biological and Environmental Research program) of the U.S. Department of Energy.
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