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Young-Jin Kim 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)
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Young-Jin Kim
Young-Jin Kim
Earth’s Largest Icebergs Meeting
OSU, Byrd PolarMay 8th, 2005
Observing the dynamic drift of giant tabular icebergs
Young-Jin Kim
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
Young-Jin Kim
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)
Young-Jin Kim
North
Young-Jin Kim
Young-Jin Kim
Young-Jin Kim
Young-Jin Kim
Young-Jin Kim
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
Young-Jin Kim
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
Young-Jin Kim
Young-Jin Kim
Young-Jin Kim
What’s 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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