Surface-melt driven Laurentide Ice Sheet retreat during the early Holocene

Details Surface-melt driven Laurentide Ice Sheet retreat during the early Holocene Surface-melt driven Laurentide Ice Sheet retreat during the early Holocene

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3624502c&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 24, CiteID L24502

Physics

2

Cryosphere: Ice Sheets, Cryosphere: Energy Balance, Cryosphere: Mass Balance (1218, 1223), Cryosphere: Dynamics

Scientific paper

To better understand mechanisms of ice-sheet decay, we investigate the surface mass balance of the Laurentide Ice Sheet (LIS) during the early Holocene, a period of known rapid LIS retreat. We use a surface energy-mass balance model (EMBM) driven with conditions derived from an equilibrium atmosphere-ocean general circulation model 9 kilo-years ago simulation. Our EMBM indicates a net LIS surface mass balance of -0.67 ± 0.13 m yr-1, with losses primarily due to enhanced boreal summer insolation and warmer summers. This rate of loss compared to LIS volume reconstructions suggests that surface ablation accounted for 74 ± 22% of the LIS mass loss with the remaining loss likely driven by dynamics resulting in basal sliding and calving. Thus surface melting likely played a governing role in the retreat and disappearance of this ice sheet.

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