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Free Content Sources and transport of suspended calcites in Pacific Deep Water

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Significantly large concentrations of suspended matter, especially calcites, are found at some locations in the Deep Pacific, particularly at the depth of the Pacific Benthic Thermocline. These particle-rich layers cannot be explained by simple classical settling processes nor by resuspension of the underlying sediment. A theoretical approach based on these data, on the hydrodynamic characteristics of the regional circulation and on some known physical and chemical parameters, leads us to postulate two possible mechanisms: the settling of large particles from surface waters and their preferential disaggregation at some specific depth, particularly at the Pacific Benthic Thermocline depth; or alternatively, the resuspension at those depths of old calcareous sediments from the flanks of East Pacific Rise associated with a horizontal advective diffusive transport mechanism. New chemical and electron-microscope analyses of GEOSECS samples give rise to the conclusion that the resuspension mechanism is the most probable. A simple model based on this mechanism, using our calcite concentrations at the PBT depth implies that the calcium carbonate flux arising from this source ranges between 5 × 106 and 5 × 108 tons per year. The erosion intensity and the quantity of calcium carbonate contained by the rises or the seamounts, must be large enough to maintain this flux. Those two constraints have been successfully tested.

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Document Type: Research Article

Publication date: August 1, 1991

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  • The Journal of Marine Research, one of the oldest journals in American marine science, publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. Biological studies involving coupling between ecological and physical processes are preferred over those that report systematics. The editors strive always to serve authors and readers in the academic oceanographic community by publishing papers vital to the marine research in the long and rich tradition of the Sears Foundation for Marine Research. We welcome you to the Journal of Marine Research.
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