The global insignificance of telluric input of dissolved trace metals (Cd, Cu, Ni and Zn) to ocean margins
Identifieur interne : 001085 ( Istex/Corpus ); précédent : 001084; suivant : 001086The global insignificance of telluric input of dissolved trace metals (Cd, Cu, Ni and Zn) to ocean margins
Auteurs : J. M. Martin ; A. J. ThomasSource :
- Marine Chemistry [ 0304-4203 ] ; 1994.
Abstract
A tentative mass-balance of dissolved trace metals (TM) in the global ocean margin is presented. Comparison of the various TM sources demonstrates the limited contribution of the telluric source (riverine and atmospheric), as compared to the oceanic input by upwelled water: marine inputs exceed telluric inputs by a factor of 2–3.5 for Cu, 2–7 for Zn, and of about 10 for Cd and Ni. Diagenetic TM release from deposited sediments, although likely for Cu and Zn, could not be quantified without ambiguity. Following intense water exchanges, TM are exchanged between the ocean margin and the open ocean very rapidly, and their short residence time is similar to the margin water residence time, i.e. about 1.3 yr.
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DOI: 10.1016/0304-4203(94)90053-1
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