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Article: Calibration of seawater temperature and d18Oseawater signals in Tridacna maxima’s d18Oshell record based on in situ data

TitleCalibration of seawater temperature and d18Oseawater signals in Tridacna maxima’s d18Oshell record based on in situ data
Authors
Issue Date2014
PublisherSpringer. The Journal's web site is located at http://link.springer.de/link/service/journals/00338/index.htm
Citation
Coral Reefs, 2014, v. 34, p. 437-450 How to Cite?
AbstractThe giant clam Tridacna maxima presents a strong potential for paleoclimatic reconstructions but its use remains limited by the fact that the relationship between the shell stable oxygen isotopes ratio (d 18 O shell ), the sea surface temperature (SST), and the stable oxygen isotopes ratio of seawater (d 18 O sw ) has not been calibrated yet. In this study, a T. maxima specimen was stained with calcein and grown in a tank for 1.5 yr. The tank seawater was monitored weekly for sea surface salinity, and the stable oxygen isotopes ratio of seawater (d 18 O sw ) and SST was recorded hourly. Micro- scopic observations of outer shell layer thin sections revealed micrometric, simple and complex, growth incre- ments. The staining experiment demonstrated that these growth increments were deposited on a daily basis. The weekly d 18 O shell record showed that the shell was precipi- tated in isotopic equilibrium with seawater and that 63 % of the (d 18 O shell - d 18 O sw ) variations were explained by SST variations. A conventional linear function (1) linking T. maxima high-resolution d 18 O shell record, in situ d 18 O sw , and SST data was calculated as: SST 1⁄4 À3:96 Æ 0:59 Ã Dd 18 O þ 20:12 Æ 0:65 ð1Þ where SST is in degree Celsius and Dd 18 O is the difference between the stable oxygen isotopes ratio of the shell and of the seawater (d 18 O shell - d 18 O sw ), in % VPDB. The root mean square error of the SST reconstructed by this equa- tion is ±1.41 °C revealing the potential of T. maxima for paleoclimatic studies. An average SST = f(d 18 O shell - d 18 O sw ) equation for giant clam is proposed by compiling the equations from the present study and previous works SST 1⁄4 À3:79 Æ 0:65 Ã Dd 18 O þ 21:31 Æ 0:93 ð2Þ
Persistent Identifierhttp://hdl.handle.net/10722/227660

 

DC FieldValueLanguage
dc.contributor.authorDuprey, NN-
dc.contributor.authorLazareth, CE-
dc.contributor.authorDupouy, C-
dc.contributor.authorButscher, J-
dc.contributor.authorFarman, R-
dc.contributor.authorMaes, C-
dc.contributor.authorCabioch, G-
dc.date.accessioned2016-07-18T09:12:05Z-
dc.date.available2016-07-18T09:12:05Z-
dc.date.issued2014-
dc.identifier.citationCoral Reefs, 2014, v. 34, p. 437-450-
dc.identifier.urihttp://hdl.handle.net/10722/227660-
dc.description.abstractThe giant clam Tridacna maxima presents a strong potential for paleoclimatic reconstructions but its use remains limited by the fact that the relationship between the shell stable oxygen isotopes ratio (d 18 O shell ), the sea surface temperature (SST), and the stable oxygen isotopes ratio of seawater (d 18 O sw ) has not been calibrated yet. In this study, a T. maxima specimen was stained with calcein and grown in a tank for 1.5 yr. The tank seawater was monitored weekly for sea surface salinity, and the stable oxygen isotopes ratio of seawater (d 18 O sw ) and SST was recorded hourly. Micro- scopic observations of outer shell layer thin sections revealed micrometric, simple and complex, growth incre- ments. The staining experiment demonstrated that these growth increments were deposited on a daily basis. The weekly d 18 O shell record showed that the shell was precipi- tated in isotopic equilibrium with seawater and that 63 % of the (d 18 O shell - d 18 O sw ) variations were explained by SST variations. A conventional linear function (1) linking T. maxima high-resolution d 18 O shell record, in situ d 18 O sw , and SST data was calculated as: SST 1⁄4 À3:96 Æ 0:59 Ã Dd 18 O þ 20:12 Æ 0:65 ð1Þ where SST is in degree Celsius and Dd 18 O is the difference between the stable oxygen isotopes ratio of the shell and of the seawater (d 18 O shell - d 18 O sw ), in % VPDB. The root mean square error of the SST reconstructed by this equa- tion is ±1.41 °C revealing the potential of T. maxima for paleoclimatic studies. An average SST = f(d 18 O shell - d 18 O sw ) equation for giant clam is proposed by compiling the equations from the present study and previous works SST 1⁄4 À3:79 Æ 0:65 Ã Dd 18 O þ 21:31 Æ 0:93 ð2Þ-
dc.languageeng-
dc.publisherSpringer. The Journal's web site is located at http://link.springer.de/link/service/journals/00338/index.htm-
dc.relation.ispartofCoral Reefs-
dc.rightsThe final publication is available at Springer via http://dx.doi.org/[insert DOI]-
dc.titleCalibration of seawater temperature and d18Oseawater signals in Tridacna maxima’s d18Oshell record based on in situ data-
dc.typeArticle-
dc.identifier.emailDuprey, NN: nduprey@hku.hk-
dc.identifier.doi10.1007/s00338-014-1245-z-
dc.identifier.hkuros259700-
dc.identifier.volume34-
dc.identifier.spage437-
dc.identifier.epage450-

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