20080868 Ver 2_C1- Salinity Notes 2017_20180629

Appendix C Notes on 2017 Salinity Data Figures
Salinity and depth graphs depict measurements recorded every 1.5 hours. Data from each
Aqua TROLL was retrieved bi-weekly. Based on a recording interval of every 1.5 hours,
each Aqua TROLL would have theoretically collected 5,840 readings during 2017 (16 per
day). Data points deleted during 2017 analysis were based on one of the following
categories:
Insufficient Water — Water levels less than 3.0 inches above the depth sensor result in
inaccurate salinity readings due to the conductivity sensor not being completely submerged
(per In -Situ, Inc.). When Aqua TROLL recorded water depth below 3.0 inches, salinity and
depth data were deleted because there was insufficient water for accurate salinity readings.
Zero depth gaps not otherwise explained within a text box may also indicate times when
wind pushes water below the Aqua TROLL probe level.
Equipment Malfunction — Data removed or missing as a result of malfunctioning
equipment or unexplainable spikes in salinity.
Servicing Error — Data missing as a result of servicing error during 2017 was related to the
user/servicer setting up a log file incorrectly.
Other — Refers to data missing as a result of the instrument taking a scheduled
measurement during servicing/downloading.
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