No, because the heavy precipitation of the tropical region causes the surface salinity to decrease. The salt moves to the bottom. Remember that rainwater is fresh.
There are a number of things that could happen to the salinity of an ocean if it's depth increased. The salinity would likely also increase.
Decrease
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The depth of field decreases.
it increases
The density of the water increases with the salinity, so saline water is denser and sinks to the bottom. Temperature is also a factor, however. Cold, saline water is the densest
Do the following factors increase or decrease as one moves to higher magnifications with the microscope? Resolution, working distance, amount of light needed, and depth of field
Does it increase, decrease, double or stay the same.
Temperature, salinity and total saturation of other minerals, depth.
By the oceanic trenches, causing erosion, earthquakes, etc. It can decrease or increase the depth of the ocean.
Density variations of seawater with latitude are very similar to those for temperature variations with latitude. Because of the influence of temperature on seawater density, low latitudes exhibit lower densities at the surface that rapidly increase with depth. Higher latitudes exhibit little or no difference in density owing to the lack of a thermocline. Such a rapid change in density with depth is called a pycnocline, and like a thermocline is absent at higher latitudes.
Yes. Chloride concentration increases with the seas depth. This is because chloride increases the salinity of the water. The more saline the water, the denser it becomes. Dense water, even if it is slightly denser, tends to sink below.