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A thermocline
was detected at 100m as the the instrument entered
the anoxic bottom water. This produced a sharp
decline in m/z 32 (oxygen) to background levels.
Conversely, m/z 44 (carbon dioxide) had a very
sharp increase, which included a reproducible
maximum at 120m. Beginning at 100m, m/z 15 (methane)
increased steadily with depth. Profiles for m/z
34 were highly correlated with m/z 32 (oxygen),
until a depth of 140m. Below this depth a significant
increase in m/z 34 is attributed to hydrogen sulfide
concentrations. At depths below 140m an increase
in m/z 48 pointed to the production of sulfur
dioxide.
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