MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral

Ryuji Asami; Yasufumi Iryu; Kimio Hanawa; Takashi Miwa; Peter Holden; Ryuichi Shinjo; Gustav Paulay

doi:10.1016/j.yqres.2013.09.002

MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral

Ryuji Asami^*, Yasufumi Iryu, Kimio Hanawa, Takashi Miwa, Peter Holden, Ryuichi Shinjo, Gustav Paulay

^*Corresponding author for this work

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

10 Citations (Scopus)

Abstract

We generated a 5.5-yr snapshot of biweekly-to-monthly resolved time series of carbon and oxygen isotope composition (δ¹³C and δ¹⁸O) and Sr/Ca and Mg/Ca from annually banded aragonite skeleton of a ~197ka pristine Porites coral collected at Niue Island (19°00'S, 169°50'W) in the southwestern subtropical Pacific Ocean. This report is the first of a high-resolution coral-based paleoclimate archive during the Marine Isotope Stage (MIS) 7 interglacial. Statistical results suggest that annual averages of sea-surface temperature (SST) and salinity (SSS) at ~197ka were not significantly different from and ~1.2 higher than at present, respectively. Monthly mean variations showed increased SSS at ~197ka that was higher (1.4-1.9 relative to today) in the austral summer than in the austral winter. Monthly SST and SSS anomalies at ~197ka indicated smaller amplitudes by ~0.3°C (11%) and ~0.3 (24%) relative to the present, possibly suggesting less influence of interannual climate variability around Niue. Our results, taken together with other climate proxy records, imply seasonal and interannual modulation of thermal and hydrological conditions, different from today, in the southwestern subtropical Pacific Ocean associated with the Western Pacific Warm Pool and the South Pacific Convergence Zone variability during the MIS 7 interglacial.

Original language	English
Pages (from-to)	575-585
Number of pages	11
Journal	Quaternary Research
Volume	80
Issue number	3
DOIs	https://doi.org/10.1016/j.yqres.2013.09.002
Publication status	Published - Nov 2013

Access to Document

10.1016/j.yqres.2013.09.002

Cite this

@article{5b9852e581dc4ec797e58d7d8359601e,

title = "MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral",

abstract = "We generated a 5.5-yr snapshot of biweekly-to-monthly resolved time series of carbon and oxygen isotope composition (δ13C and δ18O) and Sr/Ca and Mg/Ca from annually banded aragonite skeleton of a ~197ka pristine Porites coral collected at Niue Island (19°00'S, 169°50'W) in the southwestern subtropical Pacific Ocean. This report is the first of a high-resolution coral-based paleoclimate archive during the Marine Isotope Stage (MIS) 7 interglacial. Statistical results suggest that annual averages of sea-surface temperature (SST) and salinity (SSS) at ~197ka were not significantly different from and ~1.2 higher than at present, respectively. Monthly mean variations showed increased SSS at ~197ka that was higher (1.4-1.9 relative to today) in the austral summer than in the austral winter. Monthly SST and SSS anomalies at ~197ka indicated smaller amplitudes by ~0.3°C (11%) and ~0.3 (24%) relative to the present, possibly suggesting less influence of interannual climate variability around Niue. Our results, taken together with other climate proxy records, imply seasonal and interannual modulation of thermal and hydrological conditions, different from today, in the southwestern subtropical Pacific Ocean associated with the Western Pacific Warm Pool and the South Pacific Convergence Zone variability during the MIS 7 interglacial.",

keywords = "Fossil coral, MIS 7, Paleoclimate, Sea-surface salinity, Sea-surface temperature, Southwest Pacific, Sr/Ca, δO",

author = "Ryuji Asami and Yasufumi Iryu and Kimio Hanawa and Takashi Miwa and Peter Holden and Ryuichi Shinjo and Gustav Paulay",

year = "2013",

month = nov,

doi = "10.1016/j.yqres.2013.09.002",

language = "English",

volume = "80",

pages = "575--585",

journal = "Quaternary Research",

issn = "0033-5894",

publisher = "Cambridge University Press",

number = "3",

}

TY - JOUR

T1 - MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral

AU - Asami, Ryuji

AU - Iryu, Yasufumi

AU - Hanawa, Kimio

AU - Miwa, Takashi

AU - Holden, Peter

AU - Shinjo, Ryuichi

AU - Paulay, Gustav

PY - 2013/11

Y1 - 2013/11

N2 - We generated a 5.5-yr snapshot of biweekly-to-monthly resolved time series of carbon and oxygen isotope composition (δ13C and δ18O) and Sr/Ca and Mg/Ca from annually banded aragonite skeleton of a ~197ka pristine Porites coral collected at Niue Island (19°00'S, 169°50'W) in the southwestern subtropical Pacific Ocean. This report is the first of a high-resolution coral-based paleoclimate archive during the Marine Isotope Stage (MIS) 7 interglacial. Statistical results suggest that annual averages of sea-surface temperature (SST) and salinity (SSS) at ~197ka were not significantly different from and ~1.2 higher than at present, respectively. Monthly mean variations showed increased SSS at ~197ka that was higher (1.4-1.9 relative to today) in the austral summer than in the austral winter. Monthly SST and SSS anomalies at ~197ka indicated smaller amplitudes by ~0.3°C (11%) and ~0.3 (24%) relative to the present, possibly suggesting less influence of interannual climate variability around Niue. Our results, taken together with other climate proxy records, imply seasonal and interannual modulation of thermal and hydrological conditions, different from today, in the southwestern subtropical Pacific Ocean associated with the Western Pacific Warm Pool and the South Pacific Convergence Zone variability during the MIS 7 interglacial.

AB - We generated a 5.5-yr snapshot of biweekly-to-monthly resolved time series of carbon and oxygen isotope composition (δ13C and δ18O) and Sr/Ca and Mg/Ca from annually banded aragonite skeleton of a ~197ka pristine Porites coral collected at Niue Island (19°00'S, 169°50'W) in the southwestern subtropical Pacific Ocean. This report is the first of a high-resolution coral-based paleoclimate archive during the Marine Isotope Stage (MIS) 7 interglacial. Statistical results suggest that annual averages of sea-surface temperature (SST) and salinity (SSS) at ~197ka were not significantly different from and ~1.2 higher than at present, respectively. Monthly mean variations showed increased SSS at ~197ka that was higher (1.4-1.9 relative to today) in the austral summer than in the austral winter. Monthly SST and SSS anomalies at ~197ka indicated smaller amplitudes by ~0.3°C (11%) and ~0.3 (24%) relative to the present, possibly suggesting less influence of interannual climate variability around Niue. Our results, taken together with other climate proxy records, imply seasonal and interannual modulation of thermal and hydrological conditions, different from today, in the southwestern subtropical Pacific Ocean associated with the Western Pacific Warm Pool and the South Pacific Convergence Zone variability during the MIS 7 interglacial.

KW - Fossil coral

KW - MIS 7

KW - Paleoclimate

KW - Sea-surface salinity

KW - Sea-surface temperature

KW - Southwest Pacific

KW - Sr/Ca

KW - δO

UR - http://www.scopus.com/inward/record.url?scp=84887114605&partnerID=8YFLogxK

U2 - 10.1016/j.yqres.2013.09.002

DO - 10.1016/j.yqres.2013.09.002

M3 - Article

SN - 0033-5894

VL - 80

SP - 575

EP - 585

JO - Quaternary Research

JF - Quaternary Research

IS - 3

ER -

MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral

Abstract

Access to Document

Other files and links

Fingerprint

Cite this