Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate
Watanabe, T; Gagan, MK; Correge, T; Scott-Gagan, H; Cowley, J; Hantoro, WS; nabe@kahaku.go.jp
2003
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
卷号67期号:7页码:1349-1358
摘要Diploastrea heliopora forms dense, robust, dome-shaped coral colonies throughout the reef ecosystems of the tropical Pacific and Indian Oceans. This slow-growing (2 to 6 mm/yr) coral has the potential to yield continuous paleoclimate records spanning up to 1000 yr for the warmest waters on Earth, the Indo-Pacific Warm Pool, and has a long fossil history as a single recognizable species. Despite the potential of Diploastrea to be an important new paleoclimate archive, little is known about the systematics of geochemical tracers incorporated into its skeleton. To fill this knowledge gap, we compared skeletal delta(18)O signatures in live Diploastrea and Porites colonies from Southwest Lagoon, near Amedee Lighthouse, New Caledonia (at the southern latitudinal limit for Diploastrea) and Alor, Indonesia (in the core area of the Indo-Pacific Warm Pool). We designed a new microsampling technique to minimize smoothing and distortion of the isotopic records due to the complex calyx architecture and slow growth of Diploastrea. High-resolution isotope profiles from the septal portion of the Diploastrea corallite are attenuated, whereas those restricted to the central columella are similar in quality to those extracted from the well-established Porites coral archive. The delta(18)O-temperature relationship for the columellar portion of Diploastrea (-0.18parts per thousand/degreesC) is in good agreement with that derived for a nearby Porites (-0.19parts per thousand/degreesC; Quinn et al., 1996), on the basis of comparison with an in situ sea surface temperature record from Amedee Lighthouse. There is a measurable difference of 0.3 +/- 0.1parts per thousand between the kinetic/biological disequilibrium offsets from seawater delta(18)O composition for Diploastrea and Porites. Despite this offset in mean delta(18)O, Diploastrea accurately records the regional differences in mean temperature and salinity between New Caledonia and the Indo-Pacific Warm Pool. Additional tests show that Diploastrea records El Nino-Southern Oscillation (ENSO) interannual variability in sea surface temperature and salinity across the southwestern Pacific, indicating that it should yield dependable paleo-ENSO records. Based on these results, we propose that D. heliopora has the potential to provide an important new coral archive of tropical paleoclimate. (C) Copyright 2003 Elsevier Science Ltd.
部门归属Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia; Natl Sci Museum, Dept Geol, Tokyo 1690073, Japan; Inst Rech Dev, Noumea 98800, New Caledonia; Indonesian Inst Sci, Res & Dev Ctr Geotechnol, Bandung 40135, Indonesia
学科领域Geochemistry & Geophysics
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收录类别sci
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/8491
专题海洋科技动态信息-印太暖池系统研究
通讯作者nabe@kahaku.go.jp
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Watanabe, T,Gagan, MK,Correge, T,et al. Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2003,67(7):1349-1358.
APA Watanabe, T.,Gagan, MK.,Correge, T.,Scott-Gagan, H.,Cowley, J.,...&nabe@kahaku.go.jp.(2003).Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate.GEOCHIMICA ET COSMOCHIMICA ACTA,67(7),1349-1358.
MLA Watanabe, T,et al."Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate".GEOCHIMICA ET COSMOCHIMICA ACTA 67.7(2003):1349-1358.
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