Chlorophyll-a concentrations in the Bering sea basin and the western and central subarctic north Pacific in february 1998: A comparison between the Bering sea and the north Pacific

Shiomoto, A.; Hashimoto, S.; Murata, T.

Chlorophyll-a concentrations in the Bering sea basin and the western and central subarctic north Pacific in february 1998: A comparison between the Bering sea and the north Pacific

1999

Shiomoto, A. (National Research Inst. of Far Seas Fisheries, Shimizu, Shizuoka (Japan)) | Hashimoto, S. | Murata, T.

Chlorophyll-alpha (Chl-alpha) concentrations in the upper 250m were measured in the Bering Sea basin (between 52;3N and 58:30N along 180 degrees; BSB) and the western (between 42;15N and 51:00N along 165 degrees E; WSNP) and central (between 45:00N and 49:30N along 180 degrees; (CSNP) subarctic North Pacific in February 1998. Chl-alpha concentrations were found to be near homogenous in the upper mixed layer at every station. Mean +- SE within the upper mixed layer was calculated to be 0.34 +- 0.01 mu-g l(-1) (range: 0.09-0.46 mu-g l(-1); n=45) in the BSB, 0.57 +- 0.01 mu-g l(-1) (0.11-0.74 mu-g l(-1); n=52) in the WSNP and 0.52 +- 0.02 mu-g l(-1) (0.14-0.67 mu-g l(-1); n=32) in the CSNP. There were significant differences in the Chl-alpha concentration within the upper mixed layer between the BSB and other two regions. Chl-alpha concentration in the surface waters tended to be lower in the BSB than in the WSNP and CSNP in winter. Chl-alpha concentrations were mostly less than 0.3 mu-g l(-1) below the upper mixed layer in the every region. We suggest that low daily primary production and high respiration and sinking losses are related to the lower Chl-alpha concentration within the upper mixed layer in the BSB

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