37 / 59
Ref. No. [UMCES] CBL 2016-011
ACT VS16-02
37
The calculated drift rate in instrument response for the entire deployment period (using the
accepted data in Fig 5) was -0.026 mg/L/d (r
2
= 0.83; p<0.001). If we consider only the first 35
days of the deployment before any indication of a malfunction, the drift rate was only -0.009
mg/L/d (r
2
= 0.34; p<0.001). In both cases the rate would include any biofouling effects as well as
any electronic or calibration drift.
Figure 5.
Time series of DO measured by the PME miniDOT during the 12 week CBL field trial.
Top
Panel
: Continuous DO recordings from instrument (blue line) and DO of adjacent grab samples determined
by Winkler titration (red circles).
Bottom Panel
: Difference in measured DO relative to reference samples
(Instrument DO mg/L – Reference DO mg/L) observed during deployment.