The methods and preliminary data on evaluation of krill transfer factors results in subarea 48.2 in the period of 19.02-07.03.96 are presented. The polygon of 80 x 240 miles was situated in interaction zone of the two circulating systems of the climatic scale: Antarctic Circumpolar Current and Weddell Sea waters. The experiment was carried out in two stages: evaluation of krill transport through the polygon boundaries; hydroacoustic evaluation of krill biomass and distribution in the polygon and researches of krill transport peculiarities through the polygon depending on water dinamics.
Krill transport through the polygon boundaries was calculated as product of the two values, inteagrated for the layer of 0-200 m: krill density (t/cubic mile) and water output (cubic mile/hour) through 1 mile of the polygon boundary per hour. The value (t/hour) characterizes transport intensity of krill biomass through 1 mile of polygon boundary. The results of krill density evaluation, geostrophical velocities and water outputs on the polygon boundaries are presented. Average krill transport intensity (absolute values) were: mean=7.2 t/hour, s.d.=15.5 t/hour. There is sufficient variability of krill transport through polygon boundaries by value of biomass transported and by transport direction as well. The total balance of krill input-output through all the polygon boundaries was positive (2088 ±831 t/hour).
The obtained values of krill transport are compared with those of for the polygon 30 x 30 miles, situated on the western periphery of the Doubling Anticyclonic Current, doubling South Orkneys (R/V "Dmitry Stephanov", April 19.
Document Number:
WG-EMM-96/37
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Abstract