Presentation on theme: "GPS-Cellular Drifter Technology for Coastal Ocean Observing Systems Carter Ohlmann University of California, Santa Barbara Andy Sybrandy Pacific Gyre Inc."— Presentation transcript:
GPS-Cellular Drifter Technology for Coastal Ocean Observing Systems Carter Ohlmann University of California, Santa Barbara Andy Sybrandy Pacific Gyre Inc. drifter descriptive summary of data importance in coastal ocean observing systems
Argos: 100 m spatial resolution Position ~5 times each day communications costs: ~$300 drifter-month Typical Open Ocean Drifter
High-Resolution, Recoverable “Microstar” (mfg. by Pacific Gyre Inc.) GPS position accurate to ~5 m position updates as often as every minute (variable) data transmitted via Mobitex™ digital, data-only, cellular network near real-time data and thus recoverable communications costs: O($10) drifter-month range limitations (~50 km from coast)
drag-area-ratio = 41.3 known slip (< ~2 cm s -1 )
Drifter data show a variety of small-scale processes in the coastal ocean Validation of HF radar data with current meter observations are inaccurate due to consideration of disparate scales How should HF radar data be interpreted?
Summary: new drifter technology for coastal regions provides economical high-resolution (meters, minutes) data instrument error and sub-grid-scale information in HF radar data separation rate between drifters and HF radar trajectories is near 10 cm/s (relative dispersion is 4 cm/s) and directional biases exist Routine drifter releases for interpretation of HF radar data should be part of coastal ocean observing systems www.drifterdata.com