Rosenheim, B.E.; Swart, P. K.; Willenz, P. (2009). Calibration of sclerosponge oxygen isotope records to temperature using high-resolution δ18O data. Geochimica et Cosmochimica Acta. 73(18): 5308-5319.

431202

10.1016/j.gca.2009.05.047 [view]

Rosenheim, B.E.; Swart, P. K.; Willenz, P.

2009

73(18): 5308-5319

Publication

Available for editors   [request]

A revised calibration is presented relating the oxygen isotope composition of the aragonite-secreting sclerosponge Ceratoporella nicholsoni, oxygen isotope composition of seawater, and ambient water temperature. This new relationship has been obtained using high-resolution d18O data measured in sclerosponges from the Bahamas and Jamaica compared to ambient temperature measurements and d18O values of seawater from the two locations, both measured and published. New data improve an existing calibration which was determined using measurements of salinity rather than directly measured d18O val?ues of the seawater and was composed of measurements from different species of sclerosponge and other aragonite-secreting organisms. The updated calibration (n = 12, r2 = 0.95) is: T ð-CÞ ¼ 16:1ð-3:1Þ-½6:5ð-1:1Þ-ðdarag - dswÞ; where T is temperature in degrees Celsius, darag is the d18O value of aragonite normalized to VPDB, and dsw is the d18O value of water normalized to VSMOW. This calibration improves accuracy and precision of Caribbean sclerosponges for reconstructions of temperature as well as d18O values of seawater

Caribbean region

Biogeochemistry

Porifera

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