QA/QC of Ocean Currents
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Transcript of QA/QC of Ocean Currents
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QA/QC of Ocean Currents
Bill Burnett NOAA/NWS National Data Buoy Center
Stennis Space Center, MS
27 February 2008
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Currents Working Group• The first workshop (QARTOD I) was held at the NOAA National Data Buoy
Center (NDBC) office at the Stennis Space Center, MS in the winter of 2003. Over 80 participants attended with the primary task to develop minimum standards for calibration, QA/QC methods and metadata http://nautilus.baruch.sc.edu/twiki/pub/Main/WebHome/QARTOD_final_09.pdf
• QARTOD II was held February 28-March 2, 2005 in Norfolk, VA. This workshop focused on wave and current measurements and thier unique calibration, metadata and QA/QC needs. http://nautilus.baruch.sc.edu/twiki/pub/Main/WebHome/QartodIIFinal.doc
• QARTOD III was held at Scripps Institution of Oceanography, La Jolla, CA on November 2-4, 2005. It addressed QC for CTDs, in-situ currents, remote currents and waves. http://nautilus.baruch.sc.edu/twiki/bin/view/Main/Qartod3Presentations
• QARTOD IV was held at Woods Hole Oceanographic Institution on June 21-23, 2006. The meeting was held to approve Quality Control standards developed in QARTOD I – III, and begin focusing on Quality Assurance standards.
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• Current Profiler – Bridle-mount– Cage-mount– Buoy-mount
• Additional Current Profilers– Attached to C-MAN or ATON stations– Bottom-mounted
• Single Point Current Meters
Currents Strategy
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Current Technologies
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External Hull Mounts37SM CTD Sensor
External ADCP Battery Canisters (2) with Retainer Bracket
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NDBC MMS Page
Apply quality control to real-time ADCP data from deep-water oil platforms and rigs
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Surface Current Plots
Onslow BayInside Buoy
East ofVirginia Beach
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Surface Current Plots
Lake Huron
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Celtic Sea and Transocean Marianas Inertial Currents
and Current
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Endeavour and Na KikaNear-Inertial Currents
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Matterhorn and BoomvangPassing Eddies
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Thunderhorse Currents
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Ocean Star and DD-1 Currents
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Max Smith Currents
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Na Kika Bottom MountedDelayed-Mode Data
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Data Quality
• Purpose: – Remove gross errors
• Data rejected: – Virtually certain to degrade products
• Typical causes: – Transmission errors, power degradations,
broken cables
• Limitations: – Won’t detect minor errors, biases
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Data Quality
• Limit check – Are the currents within standard data limits?• Time continuity check• Vertical velocity relational check
• The limit and time continuity checks are applied to each velocity measurement• The vertical-velocity-relational check deletes horizontal current measurements when the corresponding absolute value of the vertical velocity is too high to be physically reasonable.
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Teledyne RD Instruments ADCP QUALITY CONTROL SHEETS
Pass Suspect Fail
Level 1 - Red (required)
Bit status (Built In Test) - diagnostics BIT result is zero BIT result is non-zero BIT result is NA
Echo amplitude/intensityvalue between 70
and 220 countsvalues between 60 and
70 counts
values greater than 220 counts; values less
than 60 counts
Pitch/Roll (absolute value) 0-15 deg 15-20 deg >20deg
Heading 0-360 deg
rate of change greater than 5 degrees for
ens to ens >359.9deg or negative
Pitch/Roll (delta)<1 deg diff from
one ens to next>1 deg diff from one
ens to next ens>5 deg diff from one ens
to the next
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Teledyne RD Instruments ADCP QUALITY CONTROL SHEETS
Pass Suspect Fail
Level 1 - Red (required)
Vertical Velocity
The difference is less than or equal to 20
cm/s for OO 38 (BB and NB), OS 38, 75 and 150
(BB and NB), WH Long Ranger 75
(BB and NB) and WH
QuarterMaster 150 (BB and NB), WH 300, 600 and 1200 kHz (BB and
NB)
The difference is greater than 20
cm/s and less than or equal to 40cm/s
for OO 38 (BB and NB), OS 38, 75 and 150 (BB and NB), WH
Long Ranger 75 (BB and NB) and
WH QuarterMaster
150 (BB and NB), WH 300, 600 and
1200 kHz (BB and NB)
The difference is greater than 40 cm/s for OO 38 (BB and NB), OS 38, 75 and 150 (BB and
NB), WH Long Ranger 75 (BB and NB) and WH
QuarterMaster 150 (BB and NB), WH 300, 600 and 1200
kHz (BB and NB)
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Teledyne RD Instruments ADCP QUALITY CONTROL SHEETS
Pass Suspect Fail
Level 1 - Red (required)
Correlation Magnitude Thresholds
At least 3 of the 4 correlation
magnitude values for each bin are greater than or equal to 115
for WH Long Ranger 75 kHz (BB
and NB), WH QuarterMaster 150 (BB and NB), WH 300, 600 and 1200 kHz (BB and NB): At least 3 of the 4
correlation magnitude values for
the bin are greater than or equal to 130 for OO 38 BB, OS 38, 75 and 150 BB or greater than or
equal to 170 for OO 38 NB, OS 38, 75
and 150 NB
At least 3 of the 4 correlation magnitude values for each bin are less than
115 and greater than or equal to 64 for WH
Long Ranger 75 kHz (BB and NB), WH QuarterMaster 150
(BB and NB), WH 300, 600 and 1200 kHz (BB and NB): At least 3 of
the 4 correlation magnitude values for the
bin are less than 130 and greater than or equal
to 100 for OO 38 BB, OS 38, 75 and 150 BB
or less than 170 and greater than or equal to 110 for OO 38 NB, OS
38, 75 and 150 NB
At least 3 of the 4 correlation magnitude values for each
bin are less than 64 for WH Long Ranger 75 kHz (BB
and NB), WH QuarterMaster 150 (BB and NB), WH 300, 600 and 1200 kHz (BB and NB): At least 3 of the 4 correlation magnitude
values for the bin are less than 100 for OO 38 BB,
OS 38, 75 and 150 BB or less than 110 for OO 38 NB, OS 38, 75 and 150
NB
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Teledyne RD Instruments ADCP QUALITY CONTROL SHEETS
Pass Suspect Fail
Level 1 - Red (required)
Error velocity - four beam disagreement indicator
Error velocity in each bin is less than or equal
to 15 cm/s
Error velocity in each bin is greater than 15 cms/s
and less than or equal to 30 cm/s or equals -32678
Error velocity for each bin exceeds 30 cm/s
Level 2 – Yellow (recommended)
Battery voltage (V1 & V2) two batteries 36 - 48 volts 30 - 36 volts < 30 volts
Water temperature Change in 0.25 degree C in 6
minutes >50degC or <-5degC
Pressure negative or >range of sensor
Timestamp stuck time or future time
Speed of sound (derived) >1600m/s or <1400m/s
Signal to noise level >70% >30% or <70% <30%
Surface (or bottom) reflection/ detection
No rise in echo intensity values on any beam
greater than 30 counts
Rise greater than 30 counts in echo intensity on only
one beam Rise greater than 30 counts on
two or more beams
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Teledyne RD Instruments ADCP QUALITY CONTROL SHEETS
Pass Suspect Fail
Percent solutions - number of beams used
The above values for each bin are
flagged as good
The above values for each bin flagged as
suspect or failed for less fewer than 50%
of the bins
The above values for each bin are flagged as
suspect or failed for greater than or equal to
50% of the bins
Percent good pings (PGP)
Workhorse Long Range 75 kHz:
Total percent good pings is
greater than 10%. Ocean
Observer 38 kHz: Total
percent good pings is greater
than 25%
Workhorse Long Range 75 kHz: Total
percent good pings is greater than or equal to 5% and less than
10%. Ocean Observer 38 kHz: Total percent
good pings is greater than or equal to 22% and less than 25%.
Workhorse Long Range 75 kHz: Total percent good pings is less than 5%. Ocean Observer 38 kHz: Total percent good
pings is less than 22%
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Real-Time Quality Descriptor Flags
• Categories … agree with QARTOD I recommendations:– -9 = missing value– 0 = quality not evaluated– 1= bad– 2=questionable/suspect– 3=good
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Questions?
See the data sheets at:
http://ioosdmac.fedworx.org
Contact Info:Bill BurnettDMAC Branch ChiefNational Data Buoy CenterStennis Space Center, MS [email protected]