| Abstract: | The δ13C and δ15N of particulate organic matter (POM) sampled from the Weddell Sea in 1986 and 1988 ranged from −30.4 to − 16.7%o and from −5.4 to +41.3%o, respectively. These large variations in POM δ13C and δ15N may reflect spatial/temporal changes in the concentrations and isotope abundances of CO2(aq.) and NH4+, respectively. Elevated isotope values were found exclusively in POM in or closely associated with sea ice, which may be the source of the 13C- and 15N-enriched sediments observed in this region. |
