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|a Evidence for warmer interglacials in East Antarctic ice cores |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2009-11-19. |
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|a Nature Magazine Volume 462 |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 Stable isotope ratios of oxygen and hydrogen in the Antarctic ice
core record have revolutionized our understanding of Pleistocene
climate variations and have allowed reconstructions of Antarctic
temperature over the past 800,000 years (800 kyr; refs 1, 2). The
relationship between the D/H ratio of mean annual precipitation
and mean annual surface air temperature is said to be uniform
610% over East Antarctica3 and constant with time 620%
(refs 3–5). In the absence of strong independent temperature
proxy evidence allowing us to calibrate individual ice cores, prior
general circulation model (GCM) studies have supported the
assumption of constant uniform conversion for climates cooler
than that of the present day3,5. Here we analyse the three available
340 kyr East Antarctic ice core records alongside input from GCM
modelling. We show that for warmer interglacial periods the relationship
between temperature and the isotopic signature varies
among ice core sites, and that therefore the conversions must be
nonlinear for at least some sites. Model results indicate that the
isotopic composition of East Antarctic ice is less sensitive to temperature
changes during warmer climates. We conclude that previous
temperature estimates from interglacial climates are likely to
be too low. The available evidence is consistent with a peak
Antarctic interglacial temperature that was at least 6K higher than
that of the present day —approximately double the widely quoted
361.5K (refs 5, 6). |
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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 East Antarctica (Antarctica). |
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|a L.C. Sime |u British Antarctic Survey. |
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|a E.W. Wolff |u British Antarctic Survey. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15050303/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/05/03/03/00001/FI15050303_thm.jpg |
