Abstract
The suspended matter (SM), dissolved (DOC) and particulate organic carbon (POC), chlorophyll «a» and pheophytin distributions in surface water layer of southwest Kara Sea are presented. The concentration values of the above parameters were first obtained for February- March, previously unaffected by the previous studies. It was established that the measured concentrations were significantly lower in the winter period than those observed earlier in the summer and spring seasons. According to the complex data analysis, two separate regions are clearly distinguished: to the west and east of the Belyy Island traverse. The eastern region is under the decisive influence of a river discharge, manifested in relatively high concentrations of suspended matter, DOC and POC and relatively low concentrations of chlorophyll «a». Concentrations of suspended matter, dissolved and suspended organic carbon are reduced relative to the mean values, while the share of chlorophyll «a» in the POC is much higher in the western region. An increased POC concentration in the suspended matter is also recorded. Also, in the samples of the western region, the presence of carbonates, not supplied with the river discharge, was noted. The combination of these factors makes it possible to suggest a significant contribution of the autochthonous material to the suspended matter composition. The high content POC and chlorophyll «a» in the suspended matter could mark the supply of newly formed organic matter to the surface layer of water on the border of broken ice – ice fields.
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