Sr/Ca‐Sea surface temperature calibration in the branching Caribbean coral Acropora palmata

We measured Sr/Ca ratios by thermal ionization mass spectrometry in radial and axial growth of modern Caribbean Acropora palmata corals. Comparison of our results with sea surface temperature (SST) allows radial and axial Sr/Ca‐SST calibrations of Sr/Ca (mmol/mol) = 11.30 − 0.07072 × SST (°C) and Sr/Ca (mmol/mol) = 11.32 – 0.06281 x SST (°C), respectively. Application of the calibrations to fossil Acropora palmata from the last glacial maximum in Barbados (Guilderson et al., 1994) imply ∼7°C cooler conditions than the present, much larger than the 1–1.5° cooling suggested by modern analog technique foraminifera‐based estimates (Trend‐Staid and Prell, 2002). If the foraminifera‐based estimates are correct, then the excess cooling suggested by the Barbados corals could be explained by a 5% shift in the marine Sr/Ca ratio or an addition of ∼20% abiotic secondary aragonite.

[1]  E. H. Gladfeiter Skeletal development in Acropora cervicornis: I. Patterns of calcium carbonate accretion in the axial corallite , 1982, Coral Reefs.

[2]  H. Niebler,et al.  Sea surface temperatures in the equatorial and South Atlantic Ocean during the Last Glacial Maximum (23–19 ka) , 2003 .

[3]  M. Maslin,et al.  Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000 , 2003 .

[4]  W. Prell,et al.  Sea surface temperature at the Last Glacial Maximum: A reconstruction using the modern analog technique , 2002 .

[5]  H. Elderfield,et al.  A high‐resolution calibration of Sr/Ca thermometry using the Caribbean coral Montastraea annularis , 2002 .

[6]  E. Bard,et al.  Sr/Ca, U/Ca and δ18O records in recent massive corals from Bermuda: relationships with sea surface temperature , 2001 .

[7]  B. Hamelin,et al.  Diagenesis and its impact on Sr/Ca ratio in Holocene Acropora corals , 2001 .

[8]  T. Guilderson,et al.  Tropical Atlantic coral oxygen isotopes: glacial–interglacial sea surface temperatures and climate change , 2001 .

[9]  T. P. Guildersona,et al.  Tropical Atlantic coral oxygen isotopes : glacial ± interglacial sea surface temperatures and climate change , 2001 .

[10]  M. Sarnthein,et al.  Variation of foraminiferal Sr/Ca over Quaternary glacial‐interglacial cycles: Evidence for changes in mean ocean Sr/Ca? , 2000 .

[11]  D. Schrag,et al.  Decadal sea surface temperature variability in the subtropical South Pacific from 1726 to 1997 A.D. , 2000, Science.

[12]  M. Bar-Matthews,et al.  Diagenesis in live corals from the Gulf of Aqaba. I. The effect on paleo-oceanography tracers , 2000 .

[13]  R. S. Appeldoorn,et al.  Sea surface temperatures and coral reef bleaching off La Parguera, Puerto Rico (northeastern Caribbean Sea) , 1998, Coral Reefs.

[14]  D. Schrag,et al.  Effects of Quaternary Sea Level Cycles on Strontium in Seawater , 1998 .

[15]  Mortimer,et al.  Temperature and surface-ocean water balance of the mid-holocene tropical western pacific , 1998, Science.

[16]  S. Hart,et al.  The effect of colony topography on climate signals in coral skeleton , 1997 .

[17]  J. Beck,et al.  Abrupt changes in early Holocene tropical sea surface temperature derived from coral records , 1997, Nature.

[18]  Pascal Yiou,et al.  Macintosh Program performs time‐series analysis , 1996 .

[19]  J. Chappell,et al.  High resolution windows into early Holocene climate: SrCa coral records from the Huon Peninsula , 1996 .

[20]  A. Chivas,et al.  Biological Controls on Coral Sr/Ca and δ18O Reconstructions of Sea Surface Temperatures , 1995, Science.

[21]  J. Beck,et al.  Annual cycles of UCa in coral skeletons and UCa thermometry , 1995 .

[22]  A. Chivas,et al.  A high-resolution Sr/Ca and δ18O coral record from the Great Barrier Reef, Australia, and the 1982–1983 El Niño , 1994 .

[23]  Richard G. Fairbanks,et al.  Tropical Temperature Variations Since 20,000 Years Ago: Modulating Interhemispheric Climate Change , 1994, Science.

[24]  J. Beck,et al.  Sea-Surface Temperature from Coral Skeletal Strontium/Calcium Ratios , 1992, Science.

[25]  A. Mcintyre,et al.  Seasonal reconstructions of the earth's surface at the last glacial maximum , 1981 .

[26]  S. V. Smith,et al.  Strontium-Calcium Thermometry in Coral Skeletons , 1979, Science.

[27]  J. N. Weber Incorporation of strontium into reef coral skeletal carbonate , 1973 .

[28]  H. D. Holland,et al.  The co-precipitation of cations with CaCO3-IV , 1969 .