HF Radar Measurements of Ocean Surface Currents and Winds
HF Radar Measurements of Ocean Surface Currents and Winds

Author:

Publisher:

Published: 2002

Total Pages: 6

ISBN-13:

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The objectives of this project began with the construction and deployment of two and later three multifrequency HF radar instruments (called MCR for Multifrequency Coastal Radar) to Monterey Bay, California. Further experiment deployments were to the Virginia coast and to Lake Michigan for fresh water experiments (NSF sponsorship). The data collected at these sites is reduced, analyzed and interpreted to achieve the specific research objectives listed below: 1. Improvement of radar performance by upgrading hardware and software and developing improved transmit antennas, signal processing and flexible use of multiple frequencies 2. Improvement of HF radar estimates of surface currents, vertical shear, winds, friction velocity and waves by improved estimation algorithms that use knowledge of air-sea interaction physics 3. Estimate surface wind speed and direction using multifrequency HF radar measurements by exploiting air-sea interaction physics and HF radar measurements of vertical current shear 4. Ocean science investigations, including assimilation of HF radar data into coastal ocean models for circulation, chemical and biological properties as well as air-sea interaction studies 5. Use of continuing HF radar observations on Monterey Bay in observing ships to assess the usefulness of multiple frequency HF radar in ship detection and tracking.

Measuring Ocean Currents
Measuring Ocean Currents

Author: Antony Joseph

Publisher: Newnes

Published: 2013-08-12

Total Pages: 447

ISBN-13: 0123914280

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Measuring Ocean Currents: Tools, Technologies, and Data covers all major aspects of ocean current measurements in view of the implications of ocean currents on changing climate, increasing pollution levels, and offshore engineering activities. Although more than 70% of the Earth is covered by ocean, there is limited information on the countless fine- to large-scale water motions taking place within them. This book fills that information gap as the first work that summarizes the state-of-the-art methods and instruments used for surface, subsurface, and abyssal ocean current measurements. Readers of this book will find a wealth of information on Lagrangian measurements, horizontal mapping, imaging, Eulerian measurements, and vertical profiling techniques. In addition, the book describes modern technologies for remote measurement of ocean currents and their signatures, including HF Doppler radar systems, satellite-borne sensors, ocean acoustic tomography, and more. Crucial aspects of ocean currents are described in detail as well, including dispersion of effluents discharged into the sea and transport of beneficial materials—as well as environmentally hazardous materials—from one region to another. The book highlights several important practical applications, showing how measurements relate to climate change and pollution levels, how they affect coastal and offshore engineering activities, and how they can aid in tsunami detection. - Coverage of measurement, mapping and profiling techniques - Descriptions of technologies for remote measurement of ocean currents and their signatures - Reviews crucial aspects of ocean currents, including special emphasis on the planet-spanning thermohaline circulation, known as the ocean's "conveyor belt," and its crucial role in climate change

Oceanography - High Frequency Radar and Ocean Thin Layers, Volume 10
Oceanography - High Frequency Radar and Ocean Thin Layers, Volume 10

Author: Larry Atkinson

Publisher:

Published: 1999

Total Pages: 77

ISBN-13:

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Partial contents include: (1) HF Radar Instruments, Past to Present; (2) Mapping Surface Currents in Monterey Bay with CODAR-type HF Radar; (3) The Coastal Jet: Observations of Surface Currents over the Oregon Continental Shelf from HF Radar; (4) Tidal and Wind-driven Currents from OSCR; (5) Larval Transport and Coastal Upwelling: an Application of HF Radar in Ecological Research; (6) Evolution of Bearing Determination in HF Current Mapping Radars; (7) Shipboard Deployment of a VHF OSCR System for Measuring Offshore Currents; and (8) Experience with Shipborne Measurements of Surface Current Fields by Radar.

Using Multifrequency HF Radar to Estimate Ocean Wind Fields
Using Multifrequency HF Radar to Estimate Ocean Wind Fields

Author:

Publisher:

Published: 2005

Total Pages: 5

ISBN-13:

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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 m/s for wind speed and 25 for direction with biases of 0.1 m/s 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.