Mathematics – Logic
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.139..291b&link_type=abstract
Earth and Planetary Science Letters, vol. 139, Issue 1-2, pp.291-303
Mathematics
Logic
27
Caribbean Sea, Coral Sea, Demospongea, C-13, Elsevier: Caribbean Sea, Coral Sea, Demospongea
Scientific paper
Stable isotope records of demosponges from the Caribbean and Coral Sea are described for the purpose of studying the influence of fossil fuel CO 2 on the carbon isotopic composition of dissolved inorganic carbon (DIC) in surface water. The slow-growing sponges precipitate calcium carbonate in isotopic equilibrium with ambient sea water and are used to detect changes in 13 C DIC from pre-industrial times (early 19th century) to the present. We observed similar shapes and ranges in 13 C curves measured on Caribbean specimens collected from water depths of 25, 84 and 91 m as well as a specimen collected in shallow waters off New Caledonia. The records reveal a highly significant correlation with atmospheric 13 C CO 2 · 13 C DIC values for Caribbean and Coral Sea surface waters were calculated using the 13 C sponge records. While 13 C of atmospheric CO 2 decreased by about 1.4 from the early 19th century to 1990, 13 C DIC of Caribbean and Coral Sea surface waters decreased by 0.9 ± 0.2 and 0.7 ± 0.3 , respectively. No isotopic equilibrium between surface water DIC and atmospheric CO 2 was observed, either during the pre-industrial steady state or during the last 100 years. The lower amount of depletion in the surface water 13 C DIC with respect to the atmospheric anthropogenic signal is explained by the dilution of the surface waters by biologically altered subsurface water DIC. The lower 13 C decrease in the Coral Sea points to a stronger influence of the subsurface water source compared to the Caribbean.
Böhm Florian
Dullo W.-Chr.
Joachimski Michael M.
Kretschmer W.
Lehnert H.
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