Index Catalog // ScholarsArchive@OSU

The Relationship between Winds, Surface Roughness, and Radar Backscatter at Low Incidence Angles from TRMM Precipitation Radar Measurements

Creator:: Freilich, Michael H. and Vanhoff, Barry A.
Abstract:: One year of collocated, rain-free normalized backscatter cross-section measurements from the Tropical Rainfall Mapping Mission (TRMM) precipitation radar (PR) and wind speed estimates from the TRMM Microwave Imager are used to construct fully empirical model functions relating cross section to wind speed for incidence angles from 0° (nadir) to 18°....
Resource Type:: Article
Full Text:: aspects of low-incidence angle scattering mech- Corresponding author address: Michael H. Freilich

Scatterometer-Based Assessment of 10-m Wind Analyses from the Operational ECMWF and NCEP Numerical Weather Prediction Models

Creator:: Chelton, Dudley B and Freilich, Michael H.
Abstract:: Wind measurements by the National Aeronautics and Space Administration (NASA) scatterometer (NSCAT) and the SeaWinds scatterometer on the NASA QuikSCAT satellite are compared with buoy observations to establish that the accuracies of both scatterometers are essentially the same. The scatterometer measurement errors are best characterized in terms of random component...
Resource Type:: Article
Full Text:: Operational ECMWF and NCEP Numerical Weather Prediction Models DUDLEY B. CHELTON AND MICHAEL H. FREILICH

Sampling Errors in Wind Fields Constructed from Single and Tandem Scatterometer Datasets

Creator:: Schlax, Michael G., Chelton, Dudley B., and Freilich, Michael H.
Abstract:: Sampling patterns and sampling errors from various scatterometer datasets are examined. Four single and two tandem scatterometer mission scenarios are considered. The single scatterometer missions are ERS (with a single, narrow swath), NSCAT and ASCAT (dual swaths), and QuikSCAT (a single, broad swath obtained from the SeaWinds instrument). The two...
Resource Type:: Article
Full Text:: , DUDLEY B. CHELTON, AND MICHAEL H. FREILICH College of Oceanic and Atmospheric Sciences, Oregon State

Role of morphologic feedback in surf zone sandbar response

Creator:: Plant, Nathaniel G., Freilich, Michael H., and Holman, Robert A.
Abstract:: Several aspects of feedback mechanisms associated with surf zone sandbar response have been characterized using bathymetric surveys, sampled approximately monthly over a 16-year period at the Army Corps of Engineers' Field Research Facility (North Carolina). The measured bathymetry was alongshore averaged and modeled by the superposition of two Gaussian-shaped sandbars...
Resource Type:: Article

Satellite Observations of the Wind Jets off the Pacific Coast of Central America. Part I: Case Studies and Statistical Characteristics

Creator:: Chelton, Dudley B., Freilich, Michael H., and Esbensen, Steven K.
Abstract:: Measurements of near-surface winds by the NASA scatterometer (NSCAT) from October 1996 through June 1997 are analyzed to investigate the three major wind jets along the Pacific coast of Central America that blow over the Gulfs of Tehuantepec, Papagayo, and Panama. Each jet is easily identifiable as locally intense offshore...
Resource Type:: Article
Full Text:: B. CHELTON, MICHAEL H. FREILICH, AND STEVEN K. ESBENSEN College of Oceanic and Atmospheric Sciences

Satellite Observations of the Wind Jets off the Pacific Coast of Central America. Part II: Regional Relationships and Dynamical Considerations

Creator:: Chelton, Dudley B., Freilich, Michael H., and Esbensen, Steven K.
Abstract:: Satellite estimates of winds at 10 m above the sea surface by the NASA scatterometer (NSCAT) during the 9-month period October 1996–June 1997 are analyzed to investigate the correlations between the three major wind jets along the Pacific coast of Central America and their relationships to the wind and pressure...
Resource Type:: Article
Full Text:: America. Part II: Regional Relationships and Dynamical Considerations DUDLEY B. CHELTON, MICHAEL H

An optical technique for the measurement of longshore currents

Creator:: Chickadel, C. C., Holman, Robert A., and Freilich, Michael H.
Abstract:: We present an optical method (optical current meter) to measure the longshore component of nearshore surface currents by measuring the alongshore drift of persistent sea foam in the surf zone. The method uses short time series of video data collected from an alongshore array of pixels. These space-time data are...
Resource Type:: Article
Full Text:: longshore currents C. C. Chickadel, R. A. Holman, and M. H. Freilich College of Oceanic and Atmospheric

On the Use of QuikSCAT Scatterometer Measurements of Surface Winds for Marine Weather Prediction

Creator:: Chelton, Dudley B., Freilich, Michael H., Sienkiewicz, Joseph M., and Von Ahn, Joan M.
Abstract:: The value of Quick Scatterometer (QuikSCAT) measurements of 10-m ocean vector winds for marine weather prediction is investigated from two Northern Hemisphere case studies. The first of these focuses on an intense cyclone with hurricane-force winds that occurred over the extratropical western North Pacific on 10 January 2005. The second...
Resource Type:: Article
Full Text:: Winds for Marine Weather Prediction DUDLEY B. CHELTON AND MICHAEL H. FREILICH College of Oceanic and

Role of late winter mesoscale events in the biogeochemical variability of the upper water column of the North Pacific Subtropical Gyre

Creator:: Letelier, Ricardo M., Karl, David M., Abbott, Mark R., Flament, P., Freilich, Michael H., Lukas, Roger, and Strub, P. Ted
Abstract:: Continuous records of upper water column (0–150 m) temperature profiles, spectral distribution of downwelling irradiance, and phytoplankton solar-induced fluorescence at 25 m depth were obtained during the inaugural deployment of the Hawaii Air-sea Logging Experiment, A Long-term Oligotrophic Habitat Assessment (HALE ALOHA) mooring, near the Hawaii Ocean Time-series (HOT) Station...
Resource Type:: Article

Observations of Coupling between Surface Wind Stress and Sea Surface Temperature in the Eastern Tropical Pacific

Creator:: Chelton, Dudley B., Esbensen, Steven K., Schlax, Michael G., Thum, Nicolai, Freilich, Michael H., Wentz, Frank J., Gentemann, Chelle L., McPhaden, Michael J., and Schopf, Paul S.
Abstract:: Satellite measurements of surface wind stress from the QuikSCAT scatterometer and sea surface temperature (SST) from the Tropical Rainfall Measuring Mission Microwave Imager are analyzed for the three-month period 21 July–20 October 1999 to investigate ocean–atmosphere coupling in the eastern tropical Pacific. Oceanic tropical instability waves (TIWs) with periods of...
Resource Type:: Article
Full Text:: . SCHLAX, NICOLAI THUM, AND MICHAEL H. FREILICH College of Oceanic and Atmospheric Sciences, Oregon State

ScholarsArchive@OSU

The Relationship between Winds, Surface Roughness, and Radar Backscatter at Low Incidence Angles from TRMM Precipitation Radar Measurements

Scatterometer-Based Assessment of 10-m Wind Analyses from the Operational ECMWF and NCEP Numerical Weather Prediction Models

Sampling Errors in Wind Fields Constructed from Single and Tandem Scatterometer Datasets

Role of morphologic feedback in surf zone sandbar response

Satellite Observations of the Wind Jets off the Pacific Coast of Central America. Part I: Case Studies and Statistical Characteristics

Satellite Observations of the Wind Jets off the Pacific Coast of Central America. Part II: Regional Relationships and Dynamical Considerations

An optical technique for the measurement of longshore currents

On the Use of QuikSCAT Scatterometer Measurements of Surface Winds for Marine Weather Prediction

Role of late winter mesoscale events in the biogeochemical variability of the upper water column of the North Pacific Subtropical Gyre

Observations of Coupling between Surface Wind Stress and Sea Surface Temperature in the Eastern Tropical Pacific

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