Chromium in Cascadia Basin,northeast Pacific Ocean |
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| Authors: | RE Cranston |
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| Institution: | Atlantic Geoscience Centre, Geological Survey of Canada, Dartmouth, Nova Scotia B2Y 4A2 Canada |
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| Abstract: | Water samples from a Pacific Ocean basin have been analysed for a number of forms of chromium. Total Cr, almost entirely as dissolved Cr(VI), steadily increases with depth and correlates most closely with silica data. Mid-depth regeneration of Cr is suggested by a multiple regression equation which includes Cr(total), silica and phosphate data.The release of Cr and silica from bottom sediments is apparent as the continental margin is approached. Box model transport calculations suggest that a Cr flux from the sediments on the order of 100 nmol Cr m?2 day?1 could be balanced by horizontal and vertical eddy diffusion coefficients of 106 and 10 cm2 s?1, respectively, and by horizontal and vertical advection rates of 10?2 and 10?4 cm s?1, respectively. |
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