Impact of Alaskan Stream eddies on chlorophyll distribution in the North Pacific |
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Authors: | Hiromichi Ueno William R Crawford Hiroji Onishi |
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Institution: | (1) Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, B.C., V8L 4B2, Canada;(2) 101-2527 Quadra St., Victoria, B.C., V8T 4E1, Canada |
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Abstract: | The impact of the Alaskan Stream (AS) eddies on the chlorophyll a (chl-a) distribution in the central subarctic North Pacific
was investigated through analysis of chl-a and altimetry data from satellite observations. Altimetry observations provided
the locations of mesoscale eddies in time and space within the maps of chlorophyll distributions. The climatological chl-a
distributions averaged in the area and time showing presence of AS eddies suggested that AS eddies contributed significantly
to the chl-a distribution in the deep-sea region of the subarctic North Pacific. The chl-a distribution was closely related
to the AS eddies regardless of whether the eddy was located in or detached from the AS. A combination of two or three AS eddies
sometimes formed high chl-a concentration belts that injected chlorophyll and coastal nutrient-rich waters southward from
the Aleutian Islands far into the deep-sea region of the subarctic North Pacific. These results indicate that chl-a distribution
in the central subarctic North Pacific was strongly impacted by AS eddies. |
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