Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 海洋科技动态信息-印太暖池系统研究

	Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate
	Hantoro, WS; Watanabe, T; Gagan, MK; Correge, T; Scott-Gagan, H; Cowley, J; nabe@kahaku.go.jp
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2003
卷号	67 期号:7 页码:1349-1358
ISSN号	0016-7037
英文摘要	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.
学科主题	Geochemistry & Geophysics
URL标识	查看原文
公开日期	2011-07-14
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/8491]
专题	南海海洋研究所_海洋科技动态信息-印太暖池系统研究
通讯作者	nabe@kahaku.go.jp
推荐引用方式 GB/T 7714	Hantoro, WS,Watanabe, T,Gagan, MK,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	Hantoro, WS.,Watanabe, T.,Gagan, MK.,Correge, T.,Scott-Gagan, H.,...&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	Hantoro, WS,et al."Oxygen isotope systematics in Diploastrea heliopora: New coral archive of tropical paleoclimate".GEOCHIMICA ET COSMOCHIMICA ACTA 67.7(2003):1349-1358.