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Ref. No. [UMCES] CBL 2016-011
ACT VS16-02
47
the profiled transitions. The range in measurement differences between instrument and reference
was -0.24 to 0.75 mg/L for cast 2 and -0.57 to 0.14 mg/L for cast 3.
Results for the PME miniDOT for the two Lake Michigan trials are shown in figure 16.
The miniDOT was well match during surface equilibration and then exhibited a strong negative
bias when rapidly transitioned to the cold high DO hypolimnion. The sensor did not fully
equilibrate after 7 minutes and ended at -0.8 mg/L against the reference. For cast 2, there was a
negative offset of -0.6 mg/L when equilibrated in the hypolimnion and a positive bias when rapidly
transitioned into the warm normoxic surface. The sensor appeared to reach equilibration after 7
minutes but with a final offset of around 0.4 mg/L against the reference. The range in
measurement differences between instrument and reference was -2.03 to 0.03 mg/L for cast 1 and -
0.72 to 1.63 mg/L for cast 2.