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Ref. No. [UMCES] CBL 2015-012

ACT VS15-05

Figure 4.

Time series of pH measured detected by a passive flow SeaFET pH instrument deployed

during the 1 month MLML field trial.

Top Panel

: Continuous pH

Total

recordings from instrument (blue

line) and pH

Total

of adjacent grab samples determined by mCP dye (red circles). Instrument values are

pHext corrected for ambient T and S using processing software provided with the SeaFET application.

Bottom Panel

: Difference in measured pH relative to reference samples (Instrument – Dye Ref) observed

during deployment. Zero offset is represented by dashed line as pH

Total

scale is reported the SeaFET pH

sensor and the dye reference method.