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|a Significantly warmer Arctic surface temperatures during the Pliocene indicated by multiple independent proxies |h [electronic resource]. |
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|a [S.l.] : |b Geological Society of America, |c 2010-07. |
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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 Temperatures in the Arctic have increased by an astounding 1 C in response to anthropogenic
forcing over the past 20 years and are expected to rise further in the coming decades.
The Pliocene (2.6–5.3 Ma) is of particular interest as an analog for future warming because
global temperatures were signifi cantly warmer than today for a sustained period of time,
with continental confi gurations similar to present. Here, we estimate mean annual temperature
(MAT) based upon three independent proxies from an early Pliocene peat deposit in
the Canadian High Arctic. Our proxies, including oxygen isotopes and annual ring widths
(MAT = –0.5 ± 1.9 C), coexistence of paleovegetation (MAT = –0.4 ± 4.1 C), and bacterial
tetraether composition in paleosols (MAT = –0.6 ± 5.0 C), yield estimates that are statistically
indistinguishable. The consensus among these proxies suggests that Arctic temperatures were
~19 C warmer during the Pliocene than at present, while atmospheric CO2 concentrations
were ~390 ppmv. These elevated Arctic Pliocene temperatures result in a greatly reduced and
asymmetrical latitudinal temperature gradient that is probably the result of increased poleward
heat transport and decreased albedo. These results indicate that Arctic temperatures
may be exceedingly sensitive to anthropogenic CO2 emissions. |
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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 J.S. Sinninghe Damste. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042641/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/26/41/00001/Ballantyne et al_2010_Significantly warmer Arctic surface temperatures during the Pliocene indicated |
