Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/81484
Title: Diploastrea heliopora Sr/Ca and δ18O records from northeast Luzon, Philippines: An assessment of interspecies coral proxy calibrations and climate controls of sea surface temperature and salinity
Authors: Goodkin, Nathalie F.
Siringan, Fernando P.
Hughen, K. A.
Ramos, Riovie Dela Pena
Keywords: Science::Geology
Issue Date: 2017
Source: Goodkin, N. F., Siringan, F. P., Hughen, K. A. & Ramos, R. D. P. (2017). Diploastrea heliopora Sr/Ca and δ18O records from northeast Luzon, Philippines: An assessment of interspecies coral proxy calibrations and climate controls of sea surface temperature and salinity. Paleoceanography, 32(4), 424-438. https://dx.doi.org/10.1002/2017PA003098
Project: NRF-RF2012-03 
Journal: Paleoceanography 
Series/Report no.: Paleoceanography
Abstract: The Indo-Pacific coral Diploastrea heliopora reveals regional multidecadal- to centennial- scale climate variability using coral carbonate δ18O (δ18Oc) as a combined proxy for sea surface temperature (SST) and sea surface salinity (SSS). However, to assess the coral's full potential in resolving climatic events, an independent SST proxy would be more advantageous. We examined both Sr/Ca and δ18O of Diploastrea against an adjacent Porites lobata core collected from northeast Luzon, Philippines. Winter Sr/Ca data from Diploastrea show a significant correlation to SST (r = −0.41, p < 0.05, (root-mean-square of the residual) RMSR = 0.81°C) and provide a proxy with similar sensitivity as Porites (r = −0.57, p < 0.05, RMSR = 0.62°C). An interspecies SST record is shown to be robust and used for a reconstruction of the Pacific Decadal Oscillation during boreal winter (r = −0.70, p = 0.02). While we were unable to generate a robust Diploastrea δ18O-SSS calibration at interannual timescale, the freshening trend toward the present, commonly observed in the region, is qualitatively captured in Diploastrea δ18O. Comparison with Porites δ18O and instrumental SSS records shows that the magnitude of freshening is consistent between coral species. Wet and dry season Porites δ18O provide support for the relative influence of El Niño–Southern Oscillation events and local precipitation to SSS variability at our site. The multiproxy, multispecies approach of this study further strengthens the evidence for Diploastrea as an alternate climate archive in the Indo-Pacific region and seals its potential in helping resolve less understood global-scale climate phenomena.
URI: https://hdl.handle.net/10356/81484
http://hdl.handle.net/10220/43473
ISSN: 0883-8305
DOI: 10.1002/2017PA003098
DOI (Related Dataset): 10.21979/N9/AD7AY6
Schools: Asian School of the Environment 
Research Centres: Earth Observatory of Singapore 
Rights: ©2017 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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