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These two figures
represent the dissolved oxygen and temperature profiles at Site 1, on the
left during the summer stratification, and on the right during the fall
mixing. On the Y-axis for both
figures is the depth in the water column, from the surface on top to the
bottom of the lake. As you can
see in the left figure, we have the warm epilimnion, the transition in the
thermocline and the cold hypolimnion.
This transition is reflected in the dissolved oxygen profile as you
move down in the water column, and the water actually becomes anoxic at the
deepest and coldest parts of the lake, which I will talk about in a
moment. On the right, we have
temperature and dissolved oxygen from the same site in September, and you
can see the temperature is essentially uniform throughout the water column,
as well as the dissolved oxygen.
Because the water is of uniform temperature, the density is the same,
so wind on the lake is able to mix the water thoroughly, making the
parameters uniform. Now I would
like to take you through a more complete picture of the temperature and
dissolved oxygen profiles throughout the study. [Click to next slide]
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