YoungJin Kim Earths Largest Icebergs Meeting OSU, Byrd Polar May 8th, 2005 - PowerPoint PPT Presentation

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YoungJin Kim Earths Largest Icebergs Meeting OSU, Byrd Polar May 8th, 2005

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ARGOS system is not always reliable. Transmission interval is 20 minutes ... Improving ARGOS transmission protocol. Further analysis of data transmission density ... – PowerPoint PPT presentation

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Title: YoungJin Kim Earths Largest Icebergs Meeting OSU, Byrd Polar May 8th, 2005


1
Young-Jin KimEarths Largest Icebergs
MeetingOSU, Byrd PolarMay 8th, 2005
  • Observing the dynamic drift of giant tabular
    icebergs

2
What are we interested in
  • Iceberg tracking
  • Iceberg calving and disintegration
  • Iceberg sea-ice interaction
  • Seismic tremor due to icebergs
  • Iceberg impact on marine habitats

3
What we have done to date
  • Autonomous drift stations
  • (position and meteorological data)
  • Seismometer array
  • (iceberg tremor)
  • Snow depth thermistor array
  • (surface melting)
  • Radar ice thickness sounder
  • (iceberg melting)
  • Remotely controlled webcam
  • (ice melange, habitat impact)

4
North
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9
Data stream transmission
  • ARGOS system is not always reliable
  • Transmission interval is 20 minutes
  • Stack of 3 messages (for each attempt) that
    includes current time TN , TN 1 , TN 2

10
Data contamination and loss
  • Many data outliers (15 of total dataset)
  • solely due to ARGOS transmission errors
  • Many data duplicates (20 of total dataset)
  • due to 3 message stack rebroadcast
  • Many missing data points (30 of measured)
  • due to missed uplinks to ARGOS

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13
Whats next?
  • Improving ARGOS transmission protocol
  • Further analysis of data transmission density
  • Design of intelligent rebroadcast stack to
    optimize for bridging satellite orbit gaps e.g.
    use an adaptive one TN , TN 7 , TN 19
  • Better filtering and data processing
  • Inverse model to explain dynamic drift
  • Making the data available in general purpose
    format (most likely in netCDF)
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