Showed up late this morning… CTD is now meeting in Vaughn 100, Waves is in Old Library…

People are discussing QA/QC methods, tests, etc. for CTD. Copying what’s been written so far…. this may be a duplicate effort, but can also be viewed as a backup

Focus on Quality Control and Real-time data collected in-situ

What is real-time data?
- Is definition up to the user?
- OCSD - within hours

What is Quality Control?
- Portion after the data is collected.
- Requires an activity which checks the parameters.

Methods of colection
- Profiling from ship
- Moored
- Profiling floors
- Fixed platofrms
- Gliders/AUVs… potentional for RT with telemetry
- Expendables

Parameters - define required for QC
Primary Sensors
- Conductivity
- Temperature
- Pressure
- Oxygen
- Other optical
- Position
- Date/Time/Time reference

Derived
- Depth
- Salinity
- Depth

Additional
Consider derived parameters
• Methods
• Varied Instruments

Metadata
- Time
- Position
- Time reference
- Bottom depth/Station depth… is this a parameter? Part of QA or QC?

Ways to verify data collected

No brainer tests
- Range tests: storm options.
- Climatology test: consider specific areas and seasonality
- Gradient test
- Spiking routines - 3 point test, running std of data
- Comparison with other parameters: correlation of std and compared to other sensors
- Comparison with prior or archived data: running std of data

Further tests: additional methods
- Dual sensors
- Descent rate - specific to profiles
- Ensure derived parameters are within boundaries
- Freeezing point test
- Comparison between adjacent sensors - vertical and horizontal
- Discrete samples or additional data from sensors- not real-time, QA?
- TSP relationships: water mass characteristics that differ depending on location
- Comparison with models

Consider what is required, perferred, etc.

Words of Caution
- Flag instead of throwing out data

To remove data or to flag?
- Recognize instrument problem: recover or remove?
- Allow for user to determine whether they want flagged data

Who’s responsibility is it?

Problems and how to QC
- Stuck sensor: see constant

Approaches to QC
- Automated QC versus human checking

Ordering for NOAA
- Tests of location and identification of a station/date/time.
- Stage two: spikes
- Stage three: climate
- Stage four: visual inspection