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|a Rapid sea-level rise and reef back-stepping at the close of the last interglacial highstand |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2009-04-16. |
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|a Nature Magazine Volume 458. |
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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 Widespread evidence of a 14–6-m sea-level highstand during the
last interglacial period (Marine Isotope Stage 5e) has led towarnings
that modern ice sheets will deteriorate owing to global warming and
initiate a rise of similarmagnitude by AD 2100 (ref. 1).The rate of this
projected rise is based on ice-sheet melting simulations and downplays
discoveries ofmore rapid ice loss2,3. Knowing the rate atwhich
sea level reached its highstand during the last interglacial period is
fundamental in assessing if such rapid ice-loss processes could lead
to future catastrophic sea-level rise.The bestdirect recordof sea level
during this highstand comes from well-dated fossil reefs in stable
areas4–6. However, this record lacks both reef-crest development up
to the full highstand elevation, as inferred7 from widespread intertidal
indicators at 16m, and a detailed chronology, owing to the
difficulty of replicating U-series ages on submillennial timescales8.
Here we present a complete reef-crest sequence for the last interglacial
highstand and its U-series chronology fromthe stable northeast
Yucata´n peninsula, Mexico. We find that reef development during
the highstand was punctuated by reef-crest demise at 13m and
back-stepping to 16m. The abrupt demise of the lower-reef crest,
but continuous accretion between the lower-lagoonal unit and the
upper-reef crest, allows us to infer that this back-stepping occurred
on an ecological timescale and was triggered by a 2–3-mjump in sea
level. Using strictly reliable 230Th ages of corals fromthe upper-reef
crest, and improved stratigraphic screening of coral ages fromother
stable sites, we constrain this jump to have occurred 121 kyr ago
and conclude that it supports an episode of ice-sheet instability
during the terminal phase of the last interglacial period. |
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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 Rapid sea-level rise and reef back-stepping at the close of the last interglacial highstand |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062035/00001 |y Click here for full text |
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|3 Host material |u http://www.nature.com/nature/journal/v458/n7240/abs/nature07933.html |y Rapid sea-level rise and reef back-stepping at the close of the last interglacial highstand |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/35/00001/FI15062035thm.jpg |
