Computer Science – Sound
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1227s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Issue 7, pp.1227-1232
Computer Science
Sound
4
Scientific paper
The distribution of 13 C values for organic seston and sediment was determined in three sounds in the Spartina marsh estuaries along the Georgia coast, which had high, moderate, and low inputs of freshwater. Organic matter in all three sounds had similar carbon isotope compositions, for the most part within the range of marine values ( 13 C of -18%. to -24%.). It appears that river flow does not introduce significant quantities of particulate C 3 plant material ( 13 C of -25%. to -28%.) to Georgia estuaries. Evaluation of 13 C values of estuarine seston and three size fractions of sediment indicated that while Spartina carbon ( 13 C of -13%.) can be an important component of organic matter in intertidal sediments (mean 13 C of -14.3%. to -20.0%.), it is less so in subtidal sediments (mean 13 C of -18.8%. to -21.2%.), and it is hardly present at all in the seston (mean 13 C of -24.5%.). 13 C values of dissolved inorganic carbon (DIC) in several water samples ranged between -2.5%. and -5.6%., suggesting that the isotope composition of estuarine DIC is influenced by respiratory CO 2 derived from metabolism of 13 C-depleted plant carbon. Phytoplankton production utilizing this comparatively light DIC could be a source of relatively negative 13 C carbon in the estuary. Additional origins of estuarine organic matter greatly depleted in 13 C compared to Spartina carbon remain to be identified.
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