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|a Deglacial rapid sea level rises caused by ice-sheet saddle collapses |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012-07-012. |
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|a Nature Magazine Volume 487. |
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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 The last deglaciation (21 to 7 thousand years ago) was punctuated
by several abrupt meltwater pulses, which sometimes caused
noticeable climate change1,2. Around 14 thousand years ago,
meltwater pulse 1A (MWP-1A), the largest of these events, produced
a sea level rise of 14–18 metres over 350 years3. Although
this enormous surge of water certainly originated from retreating
ice sheets, there is no consensus on the geographical source or
underlying physical mechanisms governing the rapid sea level
rise4–6. Here we present an ice-sheet modelling simulation in which
the separation of the Laurentide and Cordilleran ice sheets in
North America produces a meltwater pulse corresponding to
MWP-1A. Another meltwater pulse is produced when the
Labrador and Baffin ice domes around Hudson Bay separate,
which could be associated with the ‘8,200-year’ event, the most
pronounced abrupt climate event of the past nine thousand years7.
For both modelled pulses, the saddle between the two ice domes
becomes subject to surface melting because of a general surface
lowering caused by climate warming. The melting then rapidly
accelerates as the saddle between the two domes gets lower,
producing nine metres of sea level rise over 500 years. This mechanism
of an ice ‘saddle collapse’ probably explains MWP-1A and
the 8,200-year event and sheds light on the consequences of these
events on climate. |
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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 Deglacial rapid sea level rises caused by ice-sheet saddle collapses |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061954/00001 |y Click here for full text |
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|3 Host material |u http://www.nature.com/nature/journal/v487/n7406/full/nature11257.html |y Deglacial rapid sea level rises caused by ice-sheet saddle collapses |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/19/54/00001/FI15061954thm.jpg |
