The relationship between 13 C of organic matter and [CO 2 (aq)] in ocean surface water: Data from a JGOFS site in the northeast Atlantic Ocean and a model

Details The relationship between 13 C of organic matter and [CO 2 (aq)] in ocean surface water: Data from a JGOFS site in the northeast Atlantic Ocean and a model The relationship between 13 C of organic matter and [CO 2 (aq)] in ocean surface water: Data from a JGOFS site in the northeast Atlantic Ocean and a model

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1413r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 3, pp.1413-1419

Mathematics

Logic

18

Scientific paper

The 13 C of suspended particulate organic matter (SPOM) in surface waters increased from -22.9 to -18.1 during April 25-May 31, 1989 at the JGOFS North Atlantic Bloom Experiment Site (NABE Site; 47°N, 20°W). During the same period, nearly parallel increases in sinking POM 13 C were also found, although these values were usually lower than those of the corresponding SPOM. Consistent with the hypothesis that plankton 13 C and [CO 2 (aq)] are inversely related, the increases in both sinking and suspended POM 13 C were highly negatively correlated with mixed-layer [CO 2 (aq)] that generally decreased from 10.1-13.2 moles/kg during the five weeks. The change in SPOM 13 C per change in [CO 2 (aq)], however, appears to be somewhat greater than that expected from previous, though less direct, ocean and laboratory evidence. By adapting a model of plant 13 C by et al. (1982), it is shown that under a constant phytoplankton demand for CO 2 an inverse, nonlinear SPOM 13 C response to ambient [CO 2 (aq)] is expected. Such trends are unlike the negative linear relationships indicated by data from the NABE Site and or from Southern Hemisphere waters. Such differences between predicted and observed SPOM 13 C vs. [CO 2 (aq)] trends and among observed relationships can be reconciled, however, if biological CO 2 demand is allowed to vary. This has significant implications for the use of the 13 C of plankton (or their organic subfractions or sedimentary remains) as a proxy for past or present ocean CO 2 concentrations and biological productivity.

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