Acropora interbranch skeleton Sr/Ca ratios: evaluation of a potential new high-resolution paleothermometer

Sadler, James, Nguyen, Ai D., Leonard, Nicole D., Webb, Gregory E. and Nothdurft, Luke D. (2016) Acropora interbranch skeleton Sr/Ca ratios: evaluation of a potential new high-resolution paleothermometer. Paleoceanography, 31 4: 505-517. doi:10.1002/2015PA002898


Author Sadler, James
Nguyen, Ai D.
Leonard, Nicole D.
Webb, Gregory E.
Nothdurft, Luke D.
Title Acropora interbranch skeleton Sr/Ca ratios: evaluation of a potential new high-resolution paleothermometer
Formatted title
Acropora interbranch skeleton Sr/Ca ratios: evaluation of a potential new high-resolution paleothermometer
Journal name Paleoceanography   Check publisher's open access policy
ISSN 1944-9186
0883-8305
Publication date 2016-04
Year available 2016
Sub-type Article (original research)
DOI 10.1002/2015PA002898
Open Access Status Not Open Access
Volume 31
Issue 4
Start page 505
End page 517
Total pages 13
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing
Collection year 2017
Language eng
Formatted abstract
The majority of coral geochemistry-based paleoclimate reconstructions in the Indo-Pacific are conducted on selectively cored colonies of massive Porites. This restriction to a single genus may make it difficult to amass the required paleoclimate data for studies that require deep reef coring techniques. Acropora, however, is a highly abundant coral genus in both modern and fossil reef systems and displays potential as a novel climate archive. Here we present a calibration study for Sr/Ca ratios recovered from interbranch skeleton in corymbose Acropora colonies from Heron Reef, southern Great Barrier Reef. Significant intercolony differences in absolute Sr/Ca ratios were normalized by producing anomaly plots of both coral geochemistry and instrumental water temperature records. Weighted linear regression of these anomalies from the lagoon and fore-reef slope provide a sensitivity of -0.05 mmol/mol°C-1, with a correlation coefficient (r2 = 0.65) comparable to those of genera currently used in paleoclimate reconstructions. Reconstructions of lagoon and reef slope mean seasonality in water temperature accurately identify the greater seasonal amplitude observed in the lagoon of Heron Reef. A longer calibration period is, however, required for reliable reconstructions of annual mean water temperatures.
Keyword Acropora
Calibration study
Great Barrier Reef
Interbranch skeleton
Sr/Ca
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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