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Anjuman Behera posted an Question

November 01, 2020 • 02:47 am

30 points

CSIR NET
Earth Sciences

Can somebody explain salinity variation with the depth? latitudinal variation is not required. if possible please upload the graph of salinity variations.

Can somebody explain salinity variation with the depth? Latitudinal variation is not required.

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Sajan sarthak

Salinity at the surface increases by the loss of water to ice or evaporation, or decreased by the input of fresh waters, such as from the rivers. 2)Salinity, generally, increases with depth and there is a distinct zone called the halocline (compare this with thermocline), where salinity increases sharply. 3)Salinity at depth is very much fixed, because there is no way that water is ‘lost’, or the salt is ‘added.’ There is a marked difference in the salinity between the surface zones and the deep zones of the oceans. The lower salinity water rests above the higher salinity dense water.
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Rahul kumar Best Answer

In general, salinity decreases with depth and becomes minimum at around 700m (shown in attached graph). Below 700m, there is a slight increase in salinity and becomes nearly constant after 2500m. However, salinity is Highest at the surface. Please see the attached figure for details.
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why there is a slight increase in salinity below 700m? why is it not constant below that level?
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The slight increase in salinity below 700m may be because of high pressure condition (at higher depth). At high P condition, solubility of seawater increases (i.e. more salt can remain dissolved in water).
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