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)