MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
MS20 Laboratory: Physical and Biological Factors Affecting Oxygen ...
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6. The percentage of saturation of a gas in seawater can be calculated from the physical<br />
properties of the water (temperature, salinity, <strong>and</strong> atmospheric pressure). Sometimes, however, in<br />
the case of oxygen we have super saturation occurring in the surface layers. Why? (hint:<br />
consider the coastal ocean <strong>and</strong> processes that add O 2 to the water)<br />
7. <strong>Oxygen</strong> is a non-conservative gas- that is, it is affected by biological processes. Assume for the<br />
moment, however, that no biological processes are taking place. Sketch in the oxygen curve<br />
(below right) to indicate the theoretical oxygen concentrations with depth. Consider that the<br />
oxygen gets into the seawater through the air/sea interface only, <strong>and</strong> its concentration is<br />
controlled by the physical factors of temperature <strong>and</strong> salinity (ignore pressure effects <strong>and</strong><br />
biological effects). (hint: consider what salinity <strong>and</strong> temperature are doing in each zone before<br />
plotting the oxygen curve!)<br />
<strong>MS20</strong> Lab <strong>Oxygen</strong> rev.3/27/2005 Page 16 of 16
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