PacIOOS WQB Data QC
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Transcript of PacIOOS WQB Data QC
![Page 1: PacIOOS WQB Data QC](https://reader034.fdocuments.us/reader034/viewer/2022042818/55ba835dbb61eb1c4d8b4753/html5/thumbnails/1.jpg)
QC Challenges of Collecting Time-Continuous Water
Quality Data: PacIOOS Water Quality Buoy (WQB) Data QC
by Michael Tomlinson & Eric De Carlo
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Handout &Outline Handout contains most data products in presentation
Overview of Pacific Islands Ocean Observing System
PacIOOS water quality components
Presentation focuses on the NOAA/PMEL MapCO2 /
PacIOOS specifically Water Quality Buoy data QC
Manual data processing & QC (different time scales)
Annual (and beyond) QC & data adjustment with
Aquarius® software
Independent data (& estimate) validation
Final data release
What have we learned from 5 years of monitoring?
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IOOS – National Ocean Observing
PacIOOS
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PacIOOS
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What does PacIOOS do?
Data Collection & QC
Data Aggregation
Data Visualization
Real-time Warnings
Provides Research Data
Outreach/Communication
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Examples of Applications
Understanding Ocean Acidification Assessing the effects of storms on coastal
water quality (e.g., Tomlinson et al., 2011)
Water quality monitoring & sounding “all clear” after tsunamis (e.g., Fiedler et al., 2014)
Impacts of groundwater / surface water on
coastal marine ecosystems
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NOAA/PMEL MapCO2/ PacIOOS WQBs (T, S, O2, CO2, pH, nitrate, turbidity, chlorophyll)
Nearshore Sensors (T, S, turbidity, chlorophyll)
Kilo Nalu Observatory (tides, waves, currents, acoustic backscatter, T)
Autonomous Underwater Vehicle (bathy, currents, T, S, chlorophyll, optical backscatter)
Synoptic manual event-driven sampling
NOAA/NWS Met Stations & Rain Gages
USGS Streamflow Gages
NOAA/NOS Tide Gages & Met Stations
HIDoH Beach Monitoring
NOAA/NDBC Open Ocean Data Buoys
Satellite Imagery
PacIOOS Water Quality Components
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Water Quality Component Locations
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NOAA/PMEL MapCO2/PacIOOS WQB Sensors Sensor Variable
SBE16plus V2 SEACAT®
Temperature Salinity Pressure
SBE63 DO® Diss. Oxygen
WET Labs FLNTUS®
Chlorophyll Turbidity
ISUS-V3® Nitrate
SeaFET® pH
LI-COR CO2® CO2
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Data Processing & QC Flowchart
Figure 1
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Twice-Daily Checks
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Twice-Daily Checks (continued) Gaps in the WQB record on the website that did not exist (see graph below); caused by a problem with the Data Turbine
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Manual Processing (every 3 days)
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Monthly QC Check
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MathCAD® Check of Spreadsheet
Coefficient Check
Check Spreadsheet Calculation
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Monthly Time-Series Plot
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WQB Data QC 1 Year & Beyond
Aquarius "whiteboard" used to QC and adjust, as necessary, data from the PacIOOS WQBs. In addition to the WQB data, other data are used as surrogates to help QC the data and guide any necessary adjustments. The raw, adjusted, surrogate, and discrete (C&CH) data are plotted as time-series.
Figure 2
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Partial Aquarius® Whiteboard (close-up)
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Rare Adjustment to Salinity Data
Raw Data
Adjusted Data
Note: Adjusted data are always flagged as ESTIMATES
Figure 3
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Not So Rare Adjustment of SBE43® Dissolved Oxygen (DO) Sensor
Figure 4
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WET Labs FLNTUS® Chlorophyll & Turbidity Sensor – Ultimate Challenge
Figure 5
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Great when the sensor is working …
Figure 6
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… a real challenge when it isn’t working
Figure 7
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Final Adjusted Turbidity & Surrogates
Figure 8
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Chlorophyll had its own challenges …
Figure 9
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… but adjustable trim correction …
Figure 10
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… salvaged some of the data!
Figure 11
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Problems Evident After 1+ Years (SBE43® Membrane DO Sensor)
Sensor began to drift immediately after deployment and continued throughout the entire deployment period, regardless of the time of year. SBE conceded there was a problem but cannot explain it.
Figure 12
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Correcting the SBE43® DO Problem
Figure 13
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Independent Data QC Check
C&CH NPDES Receiving Water
Monitoring Station
Figure 14
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Raw & Adj. WQB Data and C&CH NPDES Data
Figure 15
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Figure 16
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Master PacIOOS WQB Spreadsheets
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PacIOOS Water Quality Webpage
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What have we learned in 5 years?
QC must be conducted at different time scales
Need one extra suite of sensors for annual servicing
Some sensors (e.g., SBE43® DO membrane sensor)
do not work well in shallow, subtropical water
Although expensive, need another suite of sensors with
comparable precision & accuracy for servicing checks
Data QC is not part-time job nor can it be automated …
… unless we emulate the National Data Buoy Center &
have redundant sensors (very expensive)
Routine monitoring provides valuable research data,
e.g., tsunami water quality effects (Fiedler et al., 2014)
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Questions & Contact Information
www.pacioos.org
Michael Tomlinson UHM Oceanography Flagstaff, AZ [email protected] 928-266-2236 (cell)