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|a Onset of deglacial warming in West Antarctica driven by local orbital forcing |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2013-08-22. |
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|a Nature Magazine Volume 500 |b Letter. |
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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 cause of warming in the Southern Hemisphere during the most
recent deglaciation remains a matter of debate. Hypotheses for a
Northern Hemisphere trigger, through oceanic redistributions of
heat, are based in part on the abrupt onset of warming seen in East
Antarctic ice cores and dated to 18,000 years ago, which is several
thousand years after high-latitude Northern Hemisphere summer
insolation intensity began increasing from its minimum, approximately
24,000 years ago. An alternative explanation is that local
solar insolation changes cause the Southern Hemisphere to warm
independently. Here we present results from a new, annually
resolved ice-core record from West Antarctica that reconciles these
two views. The records show that 18,000 years ago snow accumulation
inWest Antarctica began increasing, coincident with increasing
carbon dioxide concentrations,warming in EastAntarctica and cooling
in the Northern Hemisphere associated with an abrupt decrease
in Atlantic meridional overturning circulation. However, significant
warming in West Antarctica began at least 2,000 years earlier.
Circum-Antarctic sea-ice decline, driven by increasing local insolation,
is the likely cause of this warming. The marine-influencedWest
Antarctic records suggest a more active role for the Southern Ocean
in the onset of deglaciation than is inferred fromice cores in the East
Antarctic interior, which are largely isolated from sea-ice changes. |
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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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|a. |z Southern Hemisphere |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15060348/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/03/48/00001/FI15060348_thm.jpg |
