Abstract
OCEANOGRAPHERS informally term the extension of Columbia River outflow into the Pacific Ocean as the ‘Columbia River plume’. The plume can be identified by its low salinity even at a distance of several hundred kilometres from the mouth of the river (Fig. 1). The plume distributes dissolved and suspended substances in the river water over a wide surface area of the ocean and introduces annually to the euphotic zone over a billion moles of phosphorus and nitrogen fertilizers, as phosphate and nitrate. Equally significantly, the radionuclides contained in the river water are diffused over a wide region1.
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