The Sr/Ca-temperature relationship in coralline aragonite: Influence of variability in (Sr/Ca)[sub seawater] and skeletal growth parameters
- Univ. of Washington, Seattle, WA (United States)
This paper provides an evaluation of two of the most likely pitfalls of Sr/Ca thermometry, i.e., the effect of biogenic cycling of Sr vs. Ca in the surface ocean and the effect of variable extension rate on Sr incorporation in coralline aragonite. The authors also report calibration of the Sr/Ca-temperature relationship for three coral species, Porites lobata, Pocillopora eydouxi, and Pavona clavus, collected for the Hawaiian and Galapagos islands. Analyses of seawater samples show significant spatial and depth variability in the Sr:Ca ratio. The uncertainty introduced by this effect is estimated to be <0.2[degrees]C for corals located in tropical oligotrophic waters, and potentially larger for corals located in upwelling areas. Sr/Ca along two different growth axes of a Galapagos Pavona clavus, with annual extension rates of [approximately]6 and 12 mm/y, respectively, indicate an offset of 1-2[degrees]C, with higher Sr/Ca values associated with slower extension rates. The offset observed between the two growth axes may be the result of variations in extension and/or calcification rate. These results are important in determining past sea surface temperatures for reconstruction of paleoclimates.
- OSTI ID:
- 5176152
- Journal Information:
- Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 58:1; ISSN GCACAK; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540110
540310* -- Environment
Aquatic-- Basic Studies-- (1990-)
ALKALINE EARTH METALS
ANIMALS
ARAGONITE
CALCIUM
CARBONATE MINERALS
CHEMICAL ANALYSIS
CLIMATIC CHANGE
CNIDARIA
COELENTERATA
CONCENTRATION RATIO
CORALS
EARTH PLANET
ELEMENTS
HYDROGEN COMPOUNDS
INVERTEBRATES
METALS
MINERALS
OXYGEN COMPOUNDS
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANETS
QUANTITATIVE CHEMICAL ANALYSIS
SEAWATER
STRONTIUM
TEMPERATURE MEASUREMENT
WATER