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SATURN-09 D.O.

The table below contains the quality flag associated with dissolved oxygen data evaluations and the associated comments, beginning with the most recent.  Refer to the QA/QC general information page for information on the different quality levels.

 

SATURN-09

Quality Flag start time end time comment
QL4 8/1/19 2/1/20 8/1/19 – 2/1/20:  Comparison with quality controlled data from SATURN-03 suggests that the calibration of the sensor deployed at SATURN-09 began to drift/foul in August. Due to the inability to quantify the sensor drift during this time, no corrections have been applied to the data and they have been flagged as poor (QL4).
QL2 4/12/19 8/1/19 4/12/19 – 8/1/19 – the sensor deployed at SATURN-09 in mid-April 2019 was reading within manufacturer specifications when deployed.  Comparison with quality controlled data from SATURN-03 suggests that the sensor calibration did not begin to drift/foul until the beginning of August.  Data up until this point have been flagged as QL2.
QL5 6/1/16 6/10/16 Data during this time have been flagged as bad due to sensor failure
QL1 3/17/16 6/1/16 3/17/16 –6/1/16:   The sensor deployed at SATURN-09 on 3/16/16 was checked in aerated DI prior to deployment as was reading within manufacturer specifications.  An in-situ sensor check on 4/19 16 also confirmed that the sensor was unfouled and the calibration remained within manufacturer specifications.  The sensor began to fail on 6/1/16.  Data prior to this piont have been flagged as good.
QL4 8/26/15 3/17/16 8/26/15 – 3/17/16: The sensor fouled/drifted rapidly and extensively beginning around 8/25/15.  Comparison with SATURN-03 data suggests that the sensor was reading at least 30% low by October and until the end of the deployment on 3/15/16.  These data have been flagged as poor and no correction has been applied to the data.  Use these data with extreme caution.
QL3 6/16/2015 8/26/15 6/16/15 – 8/26/15:  Comparison with data from a ship-board flow-through sensor during near station readings on 2 cruises on 6/9/15 & 7/29/15 indicate that the sensor drifted/fouled during this time period.  These findings are in agreement with comparisons with SATURN-03 sfc readings which indicate that the sensor drifted to an approximate 10% offset around 8/25/15.  A Correction for linear drift during this time period has been applied to the data and the data have been flagged as QL3 due to the extent of drift and the applied correction.  These corrections should be considered approximate and do not address any possible attenuation in signal.  For details, consult the QC documentation (http://www.stccmop.org/books/qaqc_dissolved_oxygen)
QL1 4/25/15 6/16/15 4/25/15 – 6/16/15: QL1:  The sensor was serviced and cleaned on 4/25/15 and was reading within manufacturer specification prior to re-deployment.  Comparison with data from a ship-board flow-through sensor during near station readings on 5 cruises  between 4/30/15 & 6/16/15 show that the sensor did not drift or foul during this time period and the data have been flagged as good
QL4 10/10/14 4/25/15 10/10/14 – 4/25/15:  sensor fouled extensively and was reading 30% low when it was recovered and tested on 4/25/15.   Fouling onset appears to begin around 10/10/14.  No correction has been applied and these data should be considered poor and used with extreme caution.
QL3 9/8/14 10/1014 9/8/14 - 10/10/14:  The sensor was factory calibrated on 4/13/14.  However it appears the sensor began to drift or foul in early October.  The initial data from the deployment have been flagged as QL3 because they are likely to be within 10% but there are no supporting monitoring data.