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A skeletal Sr/Ca record preserved inDipsastraea(Favia)speciosaand implications for coral Sr/Ca thermometry in mid-latitude regions

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Title: A skeletal Sr/Ca record preserved inDipsastraea(Favia)speciosaand implications for coral Sr/Ca thermometry in mid-latitude regions
Authors: Seo, Inah Browse this author
Lee, Yong Il Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Yamano, Hiroya Browse this author
Shimamura, Michiyo Browse this author
Yoo, Chan Min Browse this author
Hyeong, Kiseong Browse this author
Keywords: mid-latitude coral
Dipsastraea (Favia) speciosa
sea surface temperature
paleoclimate proxy
Sr/Ca thermometry
Issue Date: 9-Aug-2013
Publisher: American Geophysical Union
Journal Title: Geochemistry, Geophysics, Geosystems
Volume: 14
Issue: 8
Start Page: 2873
End Page: 2885
Publisher DOI: 10.1002/ggge.20195
Abstract: [1] A core (900 mm long) of the scleractinian coral Dipsastraea (Favia) speciosa was collected from Iki Island (∼33°48′N), Japan, one of the highest latitude coral reefs known to exist at present, where winter monthly mean sea surface temperature (SST) drops to 13°C. The Sr/Ca profile was constructed using a bulk sampling method for the uppermost 280 mm interval of the core, which grew between 1966 and 2007, to test whether it could act as a suitable proxy for SST in a harsh environmental setting where reef-building coral do not usually survive. The Sr/Ca-SST relationship derived from the annual Sr/Ca and SST extremes predicted the observed monthly averaged summer SST extremes within an error range of ±1.1°C (1 s.d., n = 40). The obtained Sr/Ca-SST calibration was also found to be valid for subtropical Dipsastraea (Favia) corals, proving its broad applicability. However, low-amplitude winter peaks were observed in the slow-growing intervals, which we confirmed (using individual spot analysis along a continuous growth line) result from the mixing of theca grown at different times. Our bulk sampling approach, across multiple growth lines in the skeleton of D. (F.) speciosa, led to the mixing of asynchronous skeletal part. At the study site, D. (F.) speciosa grows continuously, even during the cold season, suggesting that the skeletal Sr/Ca obtained from specimens of D. (F.) speciosa can be used as an SST proxy in the northwest Pacific marginal seas.
Rights: Copyright(C)2013 American Geophysical Union
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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