Sclerosponge Sr/Ca Temperature Calibration Data
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               World Data Center for Paleoclimatology, Boulder
                                  and
                     NOAA Paleoclimatology Program
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NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!!


NAME OF DATA SET: Sclerosponge Sr/Ca Temperature Calibration Data
LAST UPDATE: 11/2005 (Original receipt by WDC Paleo)
CONTRIBUTOR: Brad Rosenheim, Woods Hole Oceanographic Institution

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2005-079

SUGGESTED DATA CITATION: Rosenheim, B.E., et al. 2005. 
Sclerosponge Sr/Ca Temperature Calibration Data.
IGBP PAGES/World Data Center for Paleoclimatology 
Data Contribution Series # 2005-079.
NOAA/NCDC Paleoclimatology Program, Boulder CO, USA.


ORIGINAL REFERENCE: Rosenheim, B. E., P. K. Swart, S.R. Thorrold, 
P. Willenz, L. Berry, and C. Latkoczy. 2004. 
High resolution Sr/Ca records in sclerosponges calibrated to 
temperature in situ. 
Geology, Vol. 32, No. 2, pp. 145-148, February 2004.  
doi: 10.1130/G20117.1


ABSTRACT:
Ratios of strontium to calcium have been analyzed by laser-ablation 
inductively coupled plasma–mass spectrometry (LA-ICP-MS) in a skeletal 
section of the sclerosponge Ceratoporella nicholsoni.  The growth period, 
representative of 3 yr, was stained in the skeleton with a fluorochrome 
(calcein). Temperatures were recorded at 2 h intervals within the shallow, 
cryptic reef enclosure that the sclerosponge inhabited on the northern 
coast of Jamaica, allowing the formulation of a direct empirical 
relationship between Sr/Ca and temperature. To verify this calibration, 
Sr/Ca ratios of two sclerosponges of the same species from depths of 67 m 
and 136 m in Exuma Sound, Bahamas, were analyzed by LA-ICP-MS and compared 
to the temperatures from these depths over a decade prior to collection. 
The result is an independently verified, high-resolution empirical calibration 
for the temperature sensitivity of Sr/Ca ratios in the aragonite skeletons of 
sclerosponges from Jamaica and the Bahamas. The calibration is a first for 
C. nicholsoni and indicates that sclerosponges are more sensitive temperature 
recorders than zooxanthellate corals. It represents an important step in 
establishing skeletal geochemistry of sclerosponges as a proxy of temperature 
in the upper 250 m of the ocean.


GEOGRAPHIC REGION: Tropical Atlantic/Caribbean Sea
PERIOD OF RECORD:  1890-1990 AD 


DESCRIPTION:
These data are from a sclerosponge in Jamaica that was calibrated 
for a  Sr/Ca thermometer that was verified by bulk data from the 
Bahamas. The data are temperature and Sr/Ca values.  The first two 
points are from the Bahamas, as explained in the text, and the 
others are from the Jamaican sclerosponge.



DATA:

Temperature,           Sr/Ca
degrees Celsius     mmol/mol
   23.07311            10.28
   25.53388           9.9765
 25.9905108      9.843456077
26.40072649      9.890581998
 26.4016219      9.860426265
26.41478035      9.709616656
26.61958448      9.821479925
 26.7288815      9.701202795
26.89260904      9.854879033
 27.1761038      9.775784414
27.37130619       9.54633134
27.41801461      9.691932731
27.92745556      9.750025974
28.00075373       9.55161675
 28.2098868      9.461051022
28.28999552      9.556383443
28.44987335      9.620906181
28.46562514      9.724481472
28.81968502      9.552491472
28.87688988      9.480910963
28.99379027      9.449911216
29.14171293      9.519879984
29.65154347      9.513100814