Distributions and removal fluxes of trace metals in the water column of the Hung-Tsai Trough off southwestern Taiwan |
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| Authors: | Wei Ching-Ling Jiann Kuo-Tung Wen Liang-Saw Sheu David D-D |
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| Institution: | Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC. weic@ntu.edu.tw |
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| Abstract: | Vertical profiles of dissolved and particulate Mn, Fe, Ni, Cu, Zn, Cd, Pb, and (234)Th were determined in the Hung-Tsai Trough off southwestern Taiwan during 19-23 November, 2004. Except in the case of Cd, the distribution coefficient (K(d)) of the trace elements showed a negative correlation with the suspended particle concentration. Based on the average K(d) values, the general sequence of particle affinities for the eight trace elements is, from highest to lowest, Fe>Mn≈Pb>Zn≈Th>Cd≈Cu≈Ni. The trace metal data was coupled with the particle removal flux estimated from (234)Th/(238)U disequilibrium to investigate metal removal by particle sinking from the euphotic layer. The residence time of trace elements with respect to particle removal from the euphotic layer was estimated. A negative correlation between the residence time and the distribution coefficient for the trace metals was found. |
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