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We found that at site 1,
the deepest site, bottom water became anoxic towards the end of the summer,
with concentrations of less than 1 ppm. This graph has time along the x-axis
and depth along the y-axis, with shallower depths at the top. The coloration
depicts dissolved oxygen concentration in ppm, with darker blue representing
lower DO concentrations. This figure shows that bottom water became anoxic
around the 7th of August. It is important to note that by the 14th of
August, all water below 10m was anoxic, which means there was about 8 meters
of anoxic water at the bottom of the lake, which is a lot. The anoxia
decreased by the beginning of october because of the beginning of turnover
and fall mixing, which I will explain with the temperature data. This anoxia
is one of the reasons why DEP recently listed Long Pond as impaired. This is
a problem because when bottom waters become anoxic, phosphorus levels are
affected.
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