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|a Increased future ice discharge from Antarctica owing to higher snowfall |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012-12-13. |
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|a Nature Magazine Volume 492 |y English. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Anthropogenic climate change is likely to cause continuing global
sea level rise1, but some processes within the Earth system may
mitigate the magnitude of the projected effect. Regional and global
climate models simulate enhanced snowfall over Antarctica, which
would provide a direct offset of the future contribution to global
sea level rise from cryospheric mass loss2,3 and ocean expansion4.
Uncertainties exist in modelled snowfall5, but even larger uncertainties
exist in the potential changes of dynamic ice discharge from
Antarctica1,6 and thus in the ultimate fate of the precipitationdeposited
ice mass. Here we show that snowfall and discharge are
not independent, but that future ice discharge will increase by up to
three times as a result of additional snowfall under global warming.
Our results, based on an ice-sheet model7 forced by climate simulations
through to the end of 2500 (ref. 8), show that the enhanced
discharge effect exceeds the effect of surface warming as well as that
of basal ice-shelf melting, and is due to the difference in surface
elevation change caused by snowfall on grounded versus floating
ice. Although different underlying forcings drive ice loss from basal
melting versus increased snowfall, similar ice dynamical processes
are nonetheless at work in both; therefore results are relatively
independent of the specific representation of the transition zone.
In an ensemble of simulations designed to capture ice-physics
uncertainty, the additional dynamic ice loss along the coastline
compensates between 30 and 65 per cent of the ice gain due to
enhanced snowfall over the entire continent. This results in a
dynamic ice loss of up to 1.25 metres in the year 2500 for the
strongest warming scenario. The reported effect thus strongly
counters a potential negative contribution to global sea level by
the Antarctic Ice Sheet. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|t Increased future ice discharge from Antarctica owing to higher snowfall |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062064/00001 |y Click here for full text |
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|3 FULL TEXT- Increased future ice discharge from Antarctica owing to higher snowfall |u http://www.nature.com/nature/journal/v492/n7428/abs/nature11616.html |y Increased future ice discharge from Antarctica owing to higher snowfall |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/64/00001/FI15062064_thm.jpg |
