Journal of the Oceanographical Society of Japan
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
Rates of Calcium Carbonate Dissolution and Organic Carbon Decomposition in the North Pacific Ocean
Chen-Tung Arthur Chen
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1990 Volume 46 Issue 5 Pages 201-210

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Abstract

Recent carbonate data collected in the North Pacific were combined with the data in the literature in order to understand more clearly the carbonate chemistry in the North Pacific. Our analyses show that inorganic CaCO3 dissolution contributes about 26% of the total inorganic CO2, increase of deep water, after leaving the Southern Ocean. The calcium and alkalinity data indicate a CaCO3 dissolution rate of 0.060±0.010 and 0.053±0.005 μ mol kg-1 yr-1 respectively, for waters deeper than 2, 000m in reference to the Weddell Sea Deep Water. The organic carbon decomposition rate is 0.107±0.012 ± mol kg-1 yr-1 while the oxygen consumption rate is 0.13± 0.002 μ mol kg-1 yr-1. These results which are based on the direct comparison of two water masses agree well with other estimates which are based on methods such as the one-dimensional-diffusion-advection model. Comparison of data along the two sections at 165°E and 150°W shows no significant difference in the ratio of the CaCO3 dissolution rate and the organic carbon decomposition rate. The eastern section, however, has a higher TCO2 input than the western section because of the older age of the deep water along the eastern section.

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