Ocean Layers and

swedishstreakMechanics

Feb 22, 2014 (3 years and 5 months ago)

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Ocean Layers and
Vertical Mixing

Shanelle

Cabral

Sierra Jacoby

Kevin Scott Hernandez

The
R
ole
o
f
S
alinity and Temperature
in Ocean Layers


Density is a physical property of a substance:
the mass of the substance in a given volume.


The variations in the surface temperature and
salinity of the oceans control the waters
density.


Density decreases where there is a decrease in
salinity or san increase in temperature.
Salinity increases when evaporation occurs.

Vertical Mixing


When the density of water increases with
depth, the water column from the surface
down is said to be stable.


If the water column has the same density
from the top to bottom it is
isopycnal
.


A water column that is neutrally stable can
be easily mixed in the vertical direction by
such forces as wind, wave action, or
currents
.

Upwellings

and
Downwellings


Downwelling

zones represent
areas where surface water is
sinking. Whereas upwelling
zones are areas where bottom
water rises to the surface.



Because
downwelling

carries
oxygen
-
rich surface water to
deeper areas, many organisms can
live in the deep water where
downwellings

occur.


Upwelling, on the other hand,
brings water rich in nutrients from
sedimentation and decay processes
from great depths to the surface.