Real-Time Data Resources from Ocean Observing Systems
Coastal HF-Radar (Surface Currents & Waves)
High-frequency (HF) radio waves (near the AM radio band) can be used to measure the surface currents and waves of the ocean. Data collected from a network of shore antennas can be used to generate maps of surface currents in the coastal ocean up to 140 miles offshore (depending on the frequency used). These maps typically use arrows to indicate the direction of current flow, and often times the color or size of the arrows indicates speed. Such maps are more suited for higher-grade students who are familiar with vectors.
For cognition purposes, ocean currents can essentially be considered the “wind” of the ocean, and since atmospheric winds are the predominant forcing factor of ocean currents in the coastal zone, comparisons between the two will typically show strong correlations (though tides, storm surges and topography also play a role).
Some research groups are currently experimenting with additional products derived from these systems, including waves, near-shore currents (i.e. 1-dimensional along-shore flow), and particle trajectories which convert the vector representations to more intuitive representations of ocean movement.
- Rutgers
Codar
Real-time currents in the NY Harbor area (so called standard-range) and along the entire NJ coast (long-range) are available. A nice animation tool allows users to browse forward and backward in time, or to navigate directly to a specific date. Additionally, the “Nearshore” product on the long-range page and the “New York Harbor Outflow” on the standard-range pages provide simplistic 1D representations of localized currents, suitable for classroom use. - Southern
California Codar
Vector maps on this site feature mouse-overs that show data values at individual points. Additionally, when points are clicked, a one-week time-series plot of current speed and direction is shown, demonstrating how currents on the map can change over time. - Monterey
Bay Particles
This page features a “drifter simulation” that demonstrates the relationship between current vectors and particle movements. - Ocean Currents
A comprehensive listing of HF-Radar sites throughout the country. The network is growing very quickly!
