(Table 11-1) Values of dark carbon dioxide assimilation in supra bottom water and surface layer bottom sediments of the Kara Sea along the section from the Ob River mouth to the Saint Anna Trough in September 2007

Calculations were made according to the isotope mass balance equation: 100A=Bx+(100-x)C, where A is d13C-Corg of sediment; i' is d13C-Corg of microorganism biomass (-20.0 per mil); i¡ is d13C-Corg in suspended matter of the surface water layer ; x is percentage of newly formed Corg in total Corg content in the fluffy layer.