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Discussion papers | Copyright
https://doi.org/10.5194/cp-2017-102
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Aug 2017

Research article | 21 Aug 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.

Application of an ice sheet model to evaluate PMIP3 LGM climatologies over the North American ice sheets

Jay R. Alder and Steve W. Hostetler Jay R. Alder and Steve W. Hostetler
  • US Geological Survey, 104 CEOAS Admin Building, Corvallis, 97331, USA

Abstract. We apply the Community Ice Sheet Model (CISM2) to the Palaeoclimate Modelling Intercomparison 3 (PMIP3) Last Glacial Maximum (LGM) simulations to determine if the general circulation models (GCMs) simulated surface temperature and precipitation climatologies would support the large North American ice sheets. We force CISM2 with eight PMIP3 GCMs, and an additional model, GENMOM. The ice sheet simulations indicate seven GCMs produce LGM temperature and precipitation climatologies that support positive mass balances of the Laurentide and Cordilleran ice sheets (LIS, CIS) in areas corresponding to those prescribed in the GCMs, and two GCMs simulate July temperatures that are too warm to support the ice sheets. Four of the nine GCMs support the development of ice sheets in Beringia in the CISM2, in conflict with the driving GCM and reconstructions that indicate the area was ice-free. We test the sensitivity of our results over a range of snow and ice positive degree-day factors, and we evaluate the role of albedo, and shortwave and longwave radiation in the simulations. Areas with perineal snow in the GCM simulations are found to correspond well to the CISM2 simulation of ice presence.

Jay R. Alder and Steve W. Hostetler
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Jay R. Alder and Steve W. Hostetler
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Data release for Application of an ice sheet model to evaluate PMIP3 LGM climatologies over the North American ice sheets J. Alder and S. Hostetler https://doi.org/10.5066/F7ZK5FK2

Jay R. Alder and Steve W. Hostetler
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Short summary
We apply the Community Ice Sheet Model to the Palaeoclimate Modelling Intercomparison 3 Last Glacial Maximum simulations to determine if the general circulation models simulated surface temperature and precipitation climatologies would support the large North American ice sheets. The ice sheet simulations indicate seven of the nine GCMs produce LGM temperature and precipitation climatologies that support positive mass balances of the Laurentide and Cordilleran ice sheets.
We apply the Community Ice Sheet Model to the Palaeoclimate Modelling Intercomparison 3 Last...
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