Using Multifrequency HF Radar to Estimate Ocean Wind Fields
CALIFORNIA UNIV SANTA CRUZ
Pagination or Media Count:
As indicated by growing deployments world wide, HF radar is an increasingly important tool for mapping coastal surface currents. It has been used to determine wind direction. We report further on the ability of multifrequency HF radar to measure the vector wind field and the impact that such measurements have on the measurement of wind fields over coastal land and sea. In this study, we use a year-long 2000-2001 data set collected over Monterey Bay, California. Our Multifrequency Coastal Radars MCRs operated at 4.8, 6.8, 13.4 and 21.8 MHz, measuring currents at effective depths of about 2.5, 1.8, 0.9 and 0.6 m respectively. For training and validation we use the M-1 buoy deployed by Francisco Chavez at the Monterey Bay Aquarium Research Institute. Validation results over the year time span indicate standard errors of prediction of 1.7 ms for wind speed and 25 for direction with biases of 0.1 ms and 0.3 respectively. We discuss limitations of this technique at low wind speeds. Finally, we present a regional wind field assimilating HF radar estimates and demonstrate the beneficial impact of multifrequency HF radar, wind field measurements, on estimation of the coastal wind field over both land and sea.
- Active and Passive Radar Detection and Equipment
- Physical and Dynamic Oceanography