Marine Isotopic Stage 5e in the Southwest Pacific: Similarities with Antarctica and ENSO inferences

Carles Pelejero; Eva Calvo; Graham A. Logan; Patrick De Deckker

doi:10.1029/2003GL018191

Marine Isotopic Stage 5e in the Southwest Pacific: Similarities with Antarctica and ENSO inferences

Carles Pelejero^*, Eva Calvo, Graham A. Logan, Patrick De Deckker

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

A detailed record of alkenone-derived sea-surface temperatures (SSTs) offshore western New Zealand has been generated for the penultimate deglaciation and last interglacial. SSTs were 3.5 to 4.5°C warmer than present, peaking 4.5 thousand years ahead of ice volume minima. The short duration of Marine Isotopic Stage 5e off New Zealand exhibits a striking parallelism to the record of air temperatures at Vostok, Antarctica. Changes in latitudinal SST gradients for the Southwest Pacific from New Zealand to the equator are also assessed, showing values consistently lower than today. In this region, this situation usually occurs during periods with positive values of the Southern Oscillation Index and thus La Niña conditions. By inference, we suggest that our assessed low thermal gradients might be indicative of a prevalence of either persistent or more frequent La Niña like conditions, particularly during early Stage 5e.

Original language	English
Pages (from-to)	CLM 2-1 - CLM 2-5
Journal	Geophysical Research Letters
Volume	30
Issue number	23
DOIs	https://doi.org/10.1029/2003GL018191
Publication status	Published - 1 Dec 2003

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title = "Marine Isotopic Stage 5e in the Southwest Pacific: Similarities with Antarctica and ENSO inferences",

abstract = "A detailed record of alkenone-derived sea-surface temperatures (SSTs) offshore western New Zealand has been generated for the penultimate deglaciation and last interglacial. SSTs were 3.5 to 4.5°C warmer than present, peaking 4.5 thousand years ahead of ice volume minima. The short duration of Marine Isotopic Stage 5e off New Zealand exhibits a striking parallelism to the record of air temperatures at Vostok, Antarctica. Changes in latitudinal SST gradients for the Southwest Pacific from New Zealand to the equator are also assessed, showing values consistently lower than today. In this region, this situation usually occurs during periods with positive values of the Southern Oscillation Index and thus La Ni{\~n}a conditions. By inference, we suggest that our assessed low thermal gradients might be indicative of a prevalence of either persistent or more frequent La Ni{\~n}a like conditions, particularly during early Stage 5e.",

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T2 - Similarities with Antarctica and ENSO inferences

AU - Pelejero, Carles

AU - Calvo, Eva

AU - Logan, Graham A.

AU - De Deckker, Patrick

PY - 2003/12/1

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N2 - A detailed record of alkenone-derived sea-surface temperatures (SSTs) offshore western New Zealand has been generated for the penultimate deglaciation and last interglacial. SSTs were 3.5 to 4.5°C warmer than present, peaking 4.5 thousand years ahead of ice volume minima. The short duration of Marine Isotopic Stage 5e off New Zealand exhibits a striking parallelism to the record of air temperatures at Vostok, Antarctica. Changes in latitudinal SST gradients for the Southwest Pacific from New Zealand to the equator are also assessed, showing values consistently lower than today. In this region, this situation usually occurs during periods with positive values of the Southern Oscillation Index and thus La Niña conditions. By inference, we suggest that our assessed low thermal gradients might be indicative of a prevalence of either persistent or more frequent La Niña like conditions, particularly during early Stage 5e.

AB - A detailed record of alkenone-derived sea-surface temperatures (SSTs) offshore western New Zealand has been generated for the penultimate deglaciation and last interglacial. SSTs were 3.5 to 4.5°C warmer than present, peaking 4.5 thousand years ahead of ice volume minima. The short duration of Marine Isotopic Stage 5e off New Zealand exhibits a striking parallelism to the record of air temperatures at Vostok, Antarctica. Changes in latitudinal SST gradients for the Southwest Pacific from New Zealand to the equator are also assessed, showing values consistently lower than today. In this region, this situation usually occurs during periods with positive values of the Southern Oscillation Index and thus La Niña conditions. By inference, we suggest that our assessed low thermal gradients might be indicative of a prevalence of either persistent or more frequent La Niña like conditions, particularly during early Stage 5e.

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DO - 10.1029/2003GL018191

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 23

ER -

Marine Isotopic Stage 5e in the Southwest Pacific: Similarities with Antarctica and ENSO inferences

Abstract

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