Sr/Ca and δ18O seasonality in a Porites coral from the MIS 9 (339-303 ka) interglacial

被引:22
作者
Ayling, Bridget F.
McCulloch, Malcolm T.
Gagan, Michael K.
Stirling, Claudine H.
Andersen, Morten B.
Blake, Steve G.
机构
[1] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
[2] ETH Zentrum, Inst Isotope Geochem & Mineral Resources, CH-8092 Zurich, Switzerland
[3] ANZLIC, Spatial Informat Council, Griffith, ACT 2603, Australia
基金
澳大利亚研究理事会;
关键词
fossil coral; SST; delta O-18; Sr/Ca; U/Ca; seasonality; insolation forcing; southeast Pacific;
D O I
10.1016/j.epsl.2006.06.009
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Past changes in the seasonal distribution of insolation across the Earth's surface are thought to play a critical role in Quaternary climate cycles. In this study we use Sr/Ca and delta O-18 as geochemical proxies in the skeleton of a fossil Porites coral to reconstruct the seasonal cycle of sea surface temperature (SST) at Henderson Island, southeast Pacific (24 degrees S, 128 degrees W) during the Marine Isotope Stage (MIS) 9 interglacial (similar to 339-303 ka). Previously-published closed-system U-series ages provide broad age constraints for the timing of reef growth for this unit on Henderson Island, ranging between 334 and 306 ka. We apply published delta O-18-SST slope relationships to the stacked 6180 annual cycle in the fossil Porites, and find the amplitude of the seasonal cycle of SST recorded by the MIS 9 coral to be -4.1 +/- 0.57 degrees C, which agrees within error with the modem seasonal cycle of SST (similar to 4.1 degrees C). Sr/Ca-SST slope relationships applied to the fossil Porites stacked Sr/Ca annual cycle suggest the amplitude of the seasonal cycle of SST was similar to 4.7 +/- 0.75 degrees C, exceeding the modern cycle by similar to 15%, but within error of the modem value. Taken together, these results suggest the seasonal cycle of SST at Henderson Island during MIS 9 equaled or exceeded the modem amplitude. Using modem latitudinal relationships between insolation seasonality and SST seasonality; we present a new application for SST amplitudes reconstructed from fossil corals that can be used in conjunction with U-series ages to provide additional geochronological constraints on the development of open-ocean, interglacial reefs. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:462 / 475
页数:14
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