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In spring of 2016, 2018 and 2019, chlorophyll a (Chl a) content was studied in the 0-50 m layer on the vast Barents Sea area - to the north of 75∘ N. Standard sampling was carried out at 11 oceanographic transects, including 52 stations. Due to the negative ice anomalies and the high-latitude position of the ice edge, original data on Chl a concentration for spring period were obtained in hard-to-reach and previously unexplored areas of the Barents Sea. The investigation area covered the Marginal Ice Arctic zone, as well as the area where the Polar Front was located quasi-stationary. The effect of the Marginal Ice Arctic and Polar frontal zones on the distribution of Chl a concentration was revealed. The strongest factor influencing the distribution of chlorophyll was the Polar Front. It divided mainly Arctic and Atlantic waters. The highest pigment concentrations corresponded to the Arctic water mass and exceeded the content of pigment in water of Atlantic origin by an order of magnitude. The impact of the Marginal Ice Arctic Front was not so obvious - the content of Chl a in waters of various genesis differed, but not more than by a factor of 2.

Influence of the Barents Sea Frontal Zones on Chlorophyll Concentration in Spring