Monitoring of chlorophyll-a concentration in the ice edge zone of the Barents Sea in 2017-2018

Arctic Biomonitoring

Vodopianova, V.V.^1 ; Vaschenko, P.S.^1 ; Bulavina, A.S.^1

Murmansk Marine Biological Institute KSC RAS, Murmansk, Russia^1

关键词: Barents Sea water;    Chlorophyll a;    Chlorophyll concentration;    Chlorophyll-a concentration;    Destructive process;    Phytoplankton community;    Spatial temporals;    Surface horizons;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/263/1/012005/pdf
DOI  :  10.1088/1755-1315/263/1/012005

来源: IOP

【 摘 要 】

A study of chlorophyll-a concentration of in the water column during the annual succession cycle of the pelagic microfitoplankton was conducted in the vast area of the Barents Sea including the ice edge zone in the west, north and east. The Active "ice edge blooming" of pelagic algocenosis, with chlorophyll concentrations ≥5 mg/m3, was found during the spring period (April-May) in both the western and eastern parts of the Barents Sea. A significant decrease of chlorophyll-a concentration at a distance from the ice edge, the so-called "ice edge effect" gradually fades out at a distance of about 60 miles. The short-term phase of maximum activation in summer is replaced by the stage of seasonal oligotrophy with the deepening of the maximum of chlorophyll and the descent of the blooming core to the horizon of 50 m (>2 mg/m3). With the onset of the winter period, destructive processes dominate in the phytoplankton community of the edge zone. The concentration of chlorophyll does not exceed 0.3 mg/m3. The results of the work will contribute to a holistic view of the spatial-temporal dynamics of such a complex and poorly studied phenomenon as "ice edge blooming" in the Barents Sea waters. New data on the concentration of chlorophyll-a in the water column will make possible to estimate production potential not only of the surface horizon but also of the deeper layers of the photic zone.