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)
