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| CORALS AND SCLEROSPONGES | ||||||||||
Isla Tortuga - Elemental Ratios (Cd/Ca and Ba/Ca) |
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Reuer, M.K., E.A. Boyle, and J.E. Cole. 2003. A mid-twentieth century reduction in tropical upwelling inferred from coralline trace element proxies. Earth and Planetary Science Letters 210:437-452.
Start Year: 1918 AD End Year: 1995 AD Data: Please Cite Data Contributors! caribbean/tortuga2003.txt |
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Summary:The Cariaco Basin is an important archive of past climate variability given its response to inter- and extratropical climate forcing and the accumulation of annually laminated sediments within an anoxic water column. This study presents high-resolution surface coral trace element records (Montastrea annularis and Siderastrea siderea) from Isla Tortuga, Venezuela, located within the upwelling center of this region. A two-fold reduction in Cd/Ca ratios (3.5^1.7 nmol/mol) is observed from 1946 to 1952 with no concurrent shift in Ba/Ca ratios. This reduction agrees with the hydrographic distribution of dissolved cadmium and barium and their expected response to upwelling. Significant anthropogenic variability is also observed from Pb/Ca analysis, observing three lead maxima since 1920. Kinetic control of trace element ratios is inferred from an interspecies comparison of Cd/Ca and Ba/Ca ratios (consistent with the Sr/Ca kinetic artifact), but these artifacts are smaller than the environmental signal and do not explain the Cd/Ca transition. The trace element records agree with historical climate data and differ from sedimentary faunal abundance records, suggesting a linear response to North Atlantic extratropical forcing cannot account for the observed historical variability in this region.More Info on Corals and Sclerosponges |
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Parameters:BaCa; CdCa |
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Complete XML Record:noaa-coral-1888 (Last Revised: 2007-09-05 ) |
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