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Some Quality Control Procedure of RV MIRAI Data

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Title: Some Quality Control Procedure of RV MIRAI Data


1
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
2
Contents
  • Global Ocean Development, Inc.
  • R/V MIRAI and its Research Facilities
  • Data Quality Control Procedure
  • Radiosounding data QC
  • ADCP data QC

3
JAMSTEC
Nippon MarineEnterprises, Ltd.
Marine WorkJapan, Ltd.
Global OceanDevelopment, Inc.
Hakuho-Maru
Natsushima
Kairei
MIRAI
Tansei-Maru
Kaiyo
Yokosuka
Drilling ship (under Construction)
4
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
5
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

6
Research Facilities (weather)
General Meteorological Observation System
Ceilometer
Shipboard Oceanographic and Atmospheric Radiation
(LDEO)
Doppler Radar
Radiosounding Launcher
HRPT, GMS SeaStar Receiver
7
Research Facilities (geophysics/geodynamics)
Gravimeter
3-ComponentMagnetometer
XBT/XCTDAuto Launcher
Multi Beam Echo Sounder Sub-bottom Profiler
ADCP
8
Data Collected
  • Radiosounding
  • ADCP
  • Bathymetry
  • Geomagnetism
  • Gravity
  • XBT/XCTD
  • Meteorological
  • Radiation
  • Satellite (HRPT/SeaWiFS)
  • and MORE

9
Radiosounding Outiline
  • Pressure
  • Temperature
  • Relative Humidity
  • Wind Speed
  • Wind Direction
  • Vertical Profile
  • Go Up to 20km
  • 3m/s

10
Temperature deg-C
Relative Humidity
11
Radiosounding Data QC
  • Check raining/cloud inrush using meteorological
    data
  • Correct hull effect

12
Check1 Check raining/cloud inrush using
Metrological data
General Meteorological Observation System
Ceilometer
13
Check1 Check raining/cloud inrush using
Metrological data
Precipitation (Meteorological Observation System )
Cloud Bottom (Ceilometer)
14
Check2 Hull Effect Correction
Altitude ?
15
Check2 Hull Effect Correction
Yoneyama et. al. (2001)
Onboard observation is compared to far result
FAR REGION
MIRAI
150m Wind upstream
16
MIRAI
Temp
Far Region (Small boat)
RH
Yoneyama et. al. (2001)
17
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.

18
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.

19
MIRAI ADCP
RDI VM75 BroadBand Data Collection RDI
VM-DAS Post Process CODAS (Univ. of Hawaii)
20
Check Poor Correlation
  • Low echo, Low correlation
  • Compare with the ship motion data (internal
    navigation unit)

21
CTD
CTD
CTD
CTD
CTD
SOG
COG
Depth
Roll
Pitch
Echo Intensity
Correlation
22
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.

23
Automatic flagging using Gautoedit
24
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)

25
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.
26
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27
2000/JUN/19 - 2000/JUN/30
MISSION To Investigate precipitation mechanism
of convection in sub-tropic region
28
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29
Table 1 Specification of Vaisala RS80 GPS
radiosonde.
30
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