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ENSO reconstructions over the past 60 ka using giant clams (Tridacna sp.) from Papua New Guinea

Identifieur interne : 002800 ( Istex/Corpus ); précédent : 002799; suivant : 002801

ENSO reconstructions over the past 60 ka using giant clams (Tridacna sp.) from Papua New Guinea

Auteurs : Robin Driscoll ; Mary Elliot ; Tom Russon ; Kevin Welsh ; Yusuke Yokoyama ; Alexander Tudhope

Source :

RBID : ISTEX:D65812A0E5EE7640266C3C8C67540D2255DE593F

Abstract

We present 12 seasonally resolved δ18O profiles of giant clams (Tridacna sp.) from the Huon Peninsula, Papua New Guinea, spanning discrete periods of time (9–38 years) over the past 60 ka. The interannual anomaly time series of these shells are used to reconstruct interannual variability which can predominantly be attributed in the modern climate to the El Niño–Southern Oscillation (ENSO) in this region. We have found a significant reduction in interannual δ18O variance during the early Holocene, whereas during Marine Isotope Stage 3 there were at least some periods with variance not significantly different to the twentieth century. We show that ENSO variability seen during the late twentieth century is rare but not unprecedented within glacial climates.

Url:
DOI: 10.1002/2014GL061446

Links to Exploration step

ISTEX:D65812A0E5EE7640266C3C8C67540D2255DE593F

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,
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<p>We present 12 seasonally resolved δ
<sup>18</sup>
O profiles of giant clams (
<i>Tridacna</i>
sp.) from the Huon Peninsula, Papua New Guinea, spanning discrete periods of time (9–38 years) over the past 60 ka. The interannual anomaly time series of these shells are used to reconstruct interannual variability which can predominantly be attributed in the modern climate to the El Niño–Southern Oscillation (ENSO) in this region. We have found a significant reduction in interannual δ
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O variance during the early Holocene, whereas during Marine Isotope Stage 3 there were at least some periods with variance not significantly different to the twentieth century. We show that ENSO variability seen during the late twentieth century is rare but not unprecedented within glacial climates.</p>
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<abstract>We present 12 seasonally resolved δ18O profiles of giant clams (Tridacna sp.) from the Huon Peninsula, Papua New Guinea, spanning discrete periods of time (9–38 years) over the past 60 ka. The interannual anomaly time series of these shells are used to reconstruct interannual variability which can predominantly be attributed in the modern climate to the El Niño–Southern Oscillation (ENSO) in this region. We have found a significant reduction in interannual δ18O variance during the early Holocene, whereas during Marine Isotope Stage 3 there were at least some periods with variance not significantly different to the twentieth century. We show that ENSO variability seen during the late twentieth century is rare but not unprecedented within glacial climates.</abstract>
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