N. Schnepf

University of Michigan–Ann Arbor

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Kenneth W. Fischer

Boeing (United States)

C.C. Teague

Codar Ocean Sensors (United States)

R.G. Onstott

Environmental Research Institute of Michigan

J.F. Vesecky

University of California, Santa Cruz

D.M. Fernandez

Universidad Complutense de Madrid

Jason M. Daida

University of Michigan–Ann Arbor

P. Hansen

Humboldt-Universität zu Berlin

Robert A. Shuchman

Michigan Technological University

J.F. Veseeky

W. R. Skinner

University of Michigan–Ann Arbor

Cooperative Institutions

University of Michigan–Ann Arbor

Environmental Research Institute of Michigan

Radar (United States)

Stanford University

Goddard Space Flight Center

Michigan Technological University

University of California, Santa Cruz

United States Geological Survey

University of Puget Sound

Nansen Environmental and Remote Sensing Center

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HF and lidar measurements of air sea interaction in the coastal zone

J.F. Vesecky Diego P. Fernández C.C. Teague Kenneth W. Fischer W. R. Skinner

The objective of this paper is to show the effectiveness of combined air-sea interaction observations on large spatial and temporal scales and with high resolution in both time and space. The National Research Council (1992) recommends in their coastal meteorological review, "...the use of recently developed remote sensors to obtain detailed four-dimensional data sets along with the upgrading of buoy and surface station networks to obtain quality, long duration data sets describing coastal regions... ." This NRC recommendation is the authors' long term goal in the research described. To illustrate their approach they report selected long term (3 years) observations of air-sea interaction phenomena by an HF (decameter wavelength) ground wave radar situated at Granite Canyon on the California coast, south of Monterey as well as lidar observations of surface wind fields observed at Atlanta, Georgia. They show how a new HF radar system, now under construction, will be combined with microwave radar, atmospheric lidar, surface buoy and other remote sensing observations to investigate air-sea interaction on scale sizes ranging from hundreds of meters to many tells of kilometers. The key to this combined measurements project is to produce the four-dimensional data sets, recommended above, at low cost through the use of automated stations.< >

Buoy

Wave radar

10.1109/comeas.1995.472335

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Initial observations of ocean currents, current shears and wind direction using a multi-frequency HF radar

C.C. Teague J.F. Veseeky P.E. Hansen N. Schnepf Jason M. Daida

A new high-frequency (4-25 MHz) phased-array radar, constructed jointly by the University of Michigan, the Environmental Research Institute of Michigan and Stanford University, was installed at Santa Cruz, California in July, 1996. After initial equipment checkout and antenna calibration using a transponder carried on a small boat, regular data collection started in October, 1996. Installation of a second HF radar is planned at a site south of Santa Cruz to allow resolution of current vectors. Wind and wave data from moored buoys in the radar field of view, wind sensors at several coastal sites, and current measurements from several CODARs in the Monterey Bay area also are available.

Transponder (aeronautics)

Wave radar

10.1109/igarss.1997.609082

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Surface current response to land-sea breeze circulation in Monterey Bay, California as observed by a new multifrequency HF radar

J.F. Vesecky C.C. Teague R.G. Onstott Jason M. Daida P. Hansen

A new multifrequency (4-25 MHz) HF radar was installed at the Long Marine Laboratory (University of California at Santa Cruz) on the north coast of Monterey Bay CA in July, 1996. This radar is capable of observing near-surface currents at varying depths in the top two meters of the ocean. Observations were made over a three week period in March, 1997 during which there was a strong land-sea breeze circulation over Monterey Bay. Radial current measurements corresponding to depths of about 0.3, 0.5, 1.0 and 1.4 m were made during this period using HF radar data from four operating frequencies, 21.8, 13.4, 6.8 and 4.8 MHz. Fourier analysis of these data shows that very near the surface the strongest periodic component is a diurnal one corresponding to the diurnally varying surface stress from the land-sea breeze. At deeper depths the diurnal component decreases in strength, but remains dominant. A semi-diurnal component, corresponding to tidally driven current, grows in strength with increasing depth of the current measurement. Thus, multifrequency HF radar combined with deeper current measurements from buoys and moorings are able to investigate the upper layer of the coastal ocean where wind and tidally driven currents struggle for dominance. Installation and calibration of a second radar at the Moss Landing Marine Laboratory, south of Santa Cruz along the Monterey Bay coast, is in progress to allow measurement of vector currents from radial observations at the two radar sites.

Current meter

10.1109/oceans.1997.624130

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Observations of near-surface ocean currents at varying depths using a new multifrequency HF radar

J.F. Vesecky C.C. Teague R.G. Onstott P. Hansen N. Schnepf

A new multifrequency (4-25 MHz) HF radar was installed at the Long Marine Lab. (University of California at Santa Cruz) on the north coast of Monterey Bay CA in July, 1996. This radar is capable of observing near-surface currents at varying depths in the top two meters of the ocean. Observations were made over a ten day period in March, 1997 during which there was a strong land-sea breeze circulation over Monterey Bay. Radial current measurements corresponding to depths of about 0.3, 0.5, 1.0 and 1.4 m were made during this period using HF radar data from four operating frequencies. Fourier analysis of these data shows that very near the surface the strongest periodic component is a diurnal one corresponding to the diurnally varying surface stress from the land-sea breeze. At deeper depths the diurnal component remains, but a semi-diurnal component grows in strength with increasing depth of the current measurement. Thus, multifrequency HF radar combined with deeper current measurements from buoys and moorings are able to investigate the upper layer of the coastal ocean where wind and tidally driven currents struggle for dominance.

10.1109/igarss.1997.609083

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Citations (1)