Brief communication: Further summer speedup of jakobshavn isbræ

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Abstract

We have extended the record of flow speed on Jakobshavn Isbræ through the summer of 2013. These new data reveal large seasonal speedups, 30 to 50% greater than previous summers. At a point a few kilometres inland from the terminus, the mean annual speed for 2012 is nearly three times as great as that in the mid-1990s, while the peak summer speeds are more than a factor of four greater. These speeds were achieved as the glacier terminus appears to have retreated to the bottom of an over-deepened basin with a depth of ∼ 1300 m below sea level. The terminus is likely to reach the deepest section of the trough within a few decades, after which it could rapidly retreat to the shallower regions ∼ 50 km farther upstream, potentially by the end of this century. © 2014 Author (s).

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Joughin, I., Smith, B. E., Shean, D. E., & Floricioiu, D. (2014). Brief communication: Further summer speedup of jakobshavn isbræ. Cryosphere, 8(1), 209–214. https://doi.org/10.5194/tc-8-209-2014

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