AustralieFrV1, Main, Exploration, bibRecord, 00AC31

Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event

Identifieur interne : 00AC31 ( Main/Exploration ); précédent : 00AC30; suivant : 00AC32

Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event

Auteurs : Thierry Correge ; Michael K. Gagan [Australie] ; J. Warren Beck [États-Unis] ; George S. Burr [États-Unis] ; Guy Cabloch ; Florence Le Coenoe [France]

Source :

Nature : (London) [ 0028-0836 ] ; 2004.

RBID : Pascal:04-0515749

Descripteurs français

Pascal (Inist)
- Younger Dryas, Océan Pacifique Sud Ouest, Modification climat, Paléoclimat, Paléotempérature, Rapport chimique, Strontium, Calcium, Haute résolution, Faune coralliaire, Isotope stable, O 18-O 16, Porites, Récif, Terrasse, Iles Vanuatu, Zone tropicale, Température, Eau surface, Refroidissement, Diploastrea heliopora, Ile Espiritu Santo.
Wicri :
- topic : Calcium, Zone tropicale.

English descriptors

KwdEn :
- O-18/O-16, Porites, Southwest Pacific, Vanuatu, Younger Dryas, calcium, chemical ratios, climate modification, cooling, corals, high resolution, paleoclimate, paleotemperature, reefs, stable isotopes, strontium, surface water, temperature, terraces, tropical zone.

Abstract

During the Younger Dryas event, about 12,000 years ago, the Northern Hemisphere cooled by between 2 and 10°C (refs 1, 2) whereas East Antarctica experienced warming'. But the spatial signature of the event in the southern mid-latitudes and tropics is less well known, as records are sparse and inconclusive^4-16. Here we present high-resolution analyses of skeletal Sr/Ca and ¹⁸O/¹⁶O ratios for a giant fossil Diploastrea heliopora coral that was preserved in growth position on the raised reef terraces of Espiritu Santo Island, Vanuatu, in the southwestern tropical Pacific Ocean¹⁷. Our data indicate that sea surface temperatures in Vanuatu were on average 4.5 ± 1.3 °C cooler during the Younger Dryas event than today, with a significant interdecadal modulation. The amplified annual cycle of sea surface temperatures, relative to today, indicates that cooling was caused by the compression of tropical waters towards the Equator. The positive correlation in our record between the oxygen isotope ratios of sea water and sea surface temperatures suggests that the South Pacific convergence zone, which brings ¹⁸O-depleted precipitation to the area today, was not active during the Younger Dryas period.

Affiliations:

Australie, France, États-Unis

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Le document en format XML

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<term>Paléotempérature</term>
<term>Rapport chimique</term>
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<front><div type="abstract" xml:lang="en">During the Younger Dryas event, about 12,000 years ago, the Northern Hemisphere cooled by between 2 and 10°C (refs 1, 2) whereas East Antarctica experienced warming'. But the spatial signature of the event in the southern mid-latitudes and tropics is less well known, as records are sparse and inconclusive<sup>4-16</sup>
. Here we present high-resolution analyses of skeletal Sr/Ca and <sup>18</sup>
O/<sup>16</sup>
O ratios for a giant fossil Diploastrea heliopora coral that was preserved in growth position on the raised reef terraces of Espiritu Santo Island, Vanuatu, in the southwestern tropical Pacific Ocean<sup>17</sup>
. Our data indicate that sea surface temperatures in Vanuatu were on average 4.5 ± 1.3 °C cooler during the Younger Dryas event than today, with a significant interdecadal modulation. The amplified annual cycle of sea surface temperatures, relative to today, indicates that cooling was caused by the compression of tropical waters towards the Equator. The positive correlation in our record between the oxygen isotope ratios of sea water and sea surface temperatures suggests that the South Pacific convergence zone, which brings <sup>18</sup>
O-depleted precipitation to the area today, was not active during the Younger Dryas period.</div>
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Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event

Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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Pour mettre un lien sur cette page dans le réseau Wicri