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upwelling

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
upwelling [¦əp¦wel·iŋ]
(oceanography)
The process by which water rises from a deeper to a shallower depth, usually as a result of divergence of offshore currents.


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During the summer of 1997-1998, measurements of beam absorption and beam attenuation coefficients, and downwelling and upwelling irradiance were made in the Southern Ocean along a S-N transect at 6 degrees E.
This could occur through a combination of known mechanisms, including increased stratification of the water column, changes in ocean upwelling and mixing, aerosol and dust nutrient input, increased acidity, and even changes in water clarity," he added.
Most will probably spawn downstream but maybe, given the perfect combination of lift from an upwelling current generated by cascading water, sufficient reserves of strength at the end of their strenuous journey from the sea to these Pennine foothills and one final desperate exertion, a few might make it over this last barrier.
 
 
 
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