Identification of local upwelling zones in the Bering Sea using hydrochemical parameters |
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Authors: | V V Sapozhnikov O S Ivanova N V Mordasova |
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Institution: | 1.Russian Federal Research Institute of Fisheries and Oceanography,Moscow,Russia |
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Abstract: | Based on the data for the oxygen in the surface layer of the Bering Sea, the areas of pronounced undersaturation (down to
75–80% and below) were distinguished in the surface layer of the Bering Sea. The low percentage values as such of the oxygen
saturation might be sustained at the sites of quasi-stationary upwellings. However, in this case, the surface layer should
be characterized by decreased temperature and increased salinity as related to the surrounding waters, as well as by increased
concentrations of nutrients (phosphates, nitrates, and silicon). The corresponding tests showed that most of the distinguished
“patches” of oxygen undersaturation were verified by the oceanological parameters; i.e., these were local upwellings. Some
of them were studied quite thoroughly (even with the mechanisms proposed for the formation of steady water lifting), particularly
in the area of the Aleutian Islands. However, there are some poorly studied areas (so-called questionable ones) at which the
low oxygen content is not confirmed by the hydrochemical parameters (plainly, they are not available); this requires more
profound and detailed study. |
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Keywords: | |
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