| CORALS AND SCLEROSPONGES |
Tongue of the Ocean - Sclerosponge Stable Isotope Data
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Swart, P.K., S. Torrold, A. Esienhauer, B. Rosenheim, C.G.A. Harrison, M. Grammer, and C. Latkoczy. 2002. Intra-annual variation
in the stable oxygen and carbon and trace element composition of sclerosponges. Paleoceanography 17(3):1045.
| Data Coverage |
North: 23.92 * South: 23.92 |
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West: -76.83 * East: -76.83 |
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Altitude: -146 m |
Start Year: 1885 AD
End Year: 1992 AD
Data: Please Cite Data Contributors!
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Summary: This paper presents data to support the presence of (i) intra-annual signals in the chemical composition of the skeletons
of sclerosponges from the Bahamas, and (ii) variable rates of skeletal accretion. These conclusions are based on data obtained
by using a microsampling method for the stable oxygen and carbon isotopes in which material was extracted at a resolution
of one sample every 32 mm and a laser microprobe which obtained trace element data every 20 mm (Sr, Mg, and Pb). An age
model was established using a combination of U-Th dating, changes in the concentration of Pb, and the change in the d13C
of the skeleton of the sclerosponges. These methods yield a mean growth rate of 220 mm/yr, but suggest that the growth rate
in this particular sclerosponge was in fact not constant and varied between 100 and 400 mm/yr. The variable growth rate
was confirmed through spectral analysis of the d18O and Sr/Ca data that showed peaks corresponding to the annual cycle in
these parameters as well as peaks corresponding to growth rates of approximately 128, 212, 270, and 400 mm/yr. The presence
of these additional frequencies suggests a growth rate between approximately 100 and 400 mm/yr. These conclusions were
supported by modeling of oxygen isotopic data measured on a scleractinian coral as well as model isotope data generated
on synthetic time series. These findings have important implications for the use of sclerosponges as proxies of paleoclimate,
because they emphasize the need for a precise yearly chronology in order that proxy data can be compared with climatic
variables such as the North Atlantic Oscillation or the Atlantic Multidecadal Oscillation.
More Info on Corals and Sclerosponges |
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Parameters: del18O; del13C
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Complete XML Record: noaa-coral-1887 (Last Revised: 2007-09-05 )
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DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
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| http://www.ncdc.noaa.gov/paleo/ |
| E-mail: bruce.a.bauer@noaa.gov |
| E-mail: paleo@noaa.gov |
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