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What factors affect the amount of dissolved oxygen?
Temperature.
The
lower the temperature, the higher the amount of dissolved
oxygen in a body of water; the opposite is also true,
in other words, the higher the water temperature the lower the
amount of dissolved oxygen.
The amount of DO is highly dependent on the temperature.
Altitude.
As altitude increases, the atmospheric (barometric)
pressure decreases. Thus, the amount of oxygen diffused
into the water decreases. Look at the graph below. It charts
the dissolved oxygen capacity based on altitude and temperature.
Altitude is represented in meters; the scale is from -500
meters (i.e. below sea level) to 2000 meters. Temperature
is represented in degrees Celsius ; the scale is from 1 to
30 degrees Celsius.
Please take a moment to review the chart below. Do you appreciate
that as altitude increase the dissolved oxygen capacity decreases
and as temperature increases the dissolved oxygen capacity
decreases.
 
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Introduction
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| Presentation | Activity
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PEER Curriculum
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Teacher's
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