Some Quality Control Procedure of RV MIRAI Data

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Some Quality Control Procedure of R/V MIRAI Data
Kantaro FUJIOKA, Yasutaka IMAI, Satoshi OKUMURA,
Souichiro SUEYOSHI, Shinya OKUMURA, Wataru
TOKUNAGA, Norio NAGAHAMA
Global Ocean Development, Inc
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Contents

• Global Ocean Development, Inc.
• R/V MIRAI and its Research Facilities
• Data Quality Control Procedure
• Radiosounding data QC
• ADCP data QC

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JAMSTEC
Nippon MarineEnterprises, Ltd.
Marine WorkJapan, Ltd.
Global OceanDevelopment, Inc.
Hakuho-Maru
Natsushima
Kairei
MIRAI
Tansei-Maru
Kaiyo
Yokosuka
Drilling ship (under Construction)
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R/V MIRAI

• Gross Tonnage 8,687tons
• Length 129m
• Draft 6.5m
• Breadth 19m
• Depth 10.5m
• Service Speed 16kt
• Crew 34
• Researchers 46

Large, Stable Platform
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Research Topics of R/V MIRAI

• Heat transportation in ocean
• Interaction between sea, ice and atmosphere
  (thermodynamics, water circulation)
• Primary production of phytoplankton
• Material cycle in ocean
• Seafloor dynamics
• Paleoceanography

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Research Facilities (weather)
General Meteorological Observation System
Ceilometer
Shipboard Oceanographic and Atmospheric Radiation
(LDEO)
Doppler Radar
Radiosounding Launcher
HRPT, GMS SeaStar Receiver
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Research Facilities (geophysics/geodynamics)
Gravimeter
3-ComponentMagnetometer
XBT/XCTDAuto Launcher
Multi Beam Echo Sounder Sub-bottom Profiler
ADCP
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Data Collected

• Radiosounding
• ADCP
• Bathymetry
• Geomagnetism
• Gravity
• XBT/XCTD
• Meteorological
• Radiation
• Satellite (HRPT/SeaWiFS)
• and MORE

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Radiosounding Outiline

• Pressure
• Temperature
• Relative Humidity
• Wind Speed
• Wind Direction
• Vertical Profile
• Go Up to 20km
• 3m/s

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Temperature deg-C
Relative Humidity
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Radiosounding Data QC

• Check raining/cloud inrush using meteorological
  data
• Correct hull effect

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Check1 Check raining/cloud inrush using
Metrological data
General Meteorological Observation System
Ceilometer
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Check1 Check raining/cloud inrush using
Metrological data
Precipitation (Meteorological Observation System )
Cloud Bottom (Ceilometer)
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Check2 Hull Effect Correction
Altitude ?
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Check2 Hull Effect Correction
Yoneyama et. al. (2001)
Onboard observation is compared to far result
FAR REGION
MIRAI
150m Wind upstream
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MIRAI
Temp
Far Region (Small boat)
RH
Yoneyama et. al. (2001)
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Radiosounding data QC

• Raining/cloud inrush is checked using
  meteorological data.
• Sounding data is strongly affected the heat
  effect of ship. To eliminate this effect, surface
  data is extrapolated using higher altitude data.
• Finally, raw and surface corrected data is made.

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Data Quality Control Outline

• Radiosounding
• Check validity using meteorological data
• Correct hull effect
• ADCP
• Check poor correlation using ship motion data
  (Inertial Navigation Unit, Honeywell, DRUH )
• Gautoedit software is applied for automatic
  flagging.

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MIRAI ADCP
RDI VM75 BroadBand Data Collection RDI
VM-DAS Post Process CODAS (Univ. of Hawaii)
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Check Poor Correlation

• Low echo, Low correlation
• Compare with the ship motion data (internal
  navigation unit)

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CTD
CTD
CTD
CTD
CTD
SOG
COG
Depth
Roll
Pitch
Echo Intensity
Correlation
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Automatic flagging using gautoedit

• Advantages
• poor data flag attachment is collected by one
  screen, and control is possible.
• Along with a time-axis with same echo intensity,
  self-correlation, cross-sectional flow velocity,
  etc., comparison is possible.
• 3. Since flow velocity which is the last product
  can also be displayed, it is possible to
  visualize the influence data edit affects the
  last product on real time.

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Automatic flagging using Gautoedit
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ADCP data QC

• Check poor correlation using ship motion
• Automatic flagging using Gautoedit

Future Prospect

• Recalculate data using more accurate ship
  heading, ship motion (apply Inertial Navigation
  data)

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Conclusion
Some QC procedures are introduced. Radiosounding
Raining/could inrush is checked using
meteorological data. After that, the hull
influence is removed. ADCP Poor correlation is
checked using ship motion data. Gautoedit
software is applied for automatic flagging.
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2000/JUN/19 - 2000/JUN/30
MISSION To Investigate precipitation mechanism
of convection in sub-tropic region
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Table 1 Specification of Vaisala RS80 GPS
radiosonde.
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