Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Gravity––Capillary Wave Curvature Spectrum and Mean-Square Slope Retrieved from Microwave Radiometric Measurements (Coastal Ocean Probing Experiment)

Gravity––Capillary Wave Curvature Spectrum and Mean-Square Slope Retrieved from Microwave... Brightness temperature of the sea surface is determined by surface waves of different scales. Polarimetric measurements collected by microwave radiometers at several viewing angles and frequencies give an opportunity to convert the observed brightness temperatures to the mean-square slope of long waves and curvature spectral density in the gravity––capillary interval without a priori assumptions about the shape of spectrum. Such an inversion was made using radiometric data collected during the Coastal Ocean Probing Experiment (COPE’’95) from a blimp. It is shown that at low and moderate wind speed conditions typical for COPE’’95 (4––7 m s −−1 ) the curvature spectrum has a maximum at wavenumber of about 4.5 rad cm −−1 , slightly higher than the wavenumber of the phase velocity minimum. The maximum corresponds to the wavenumber with the highest initial growth rate as predicted by theory for the growth rate of wind-induced gravity––capillary waves based on the Orr–– Sommerfeld equation. The author’’s estimation of the mean-square slope of surface waves is very close to the Cox and Munk values for stable and unstable atmospheric stratification. The radiometric results are compared with several gravity––capillary wave spectral models. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Atmospheric and Oceanic Technology American Meteorological Society

Gravity––Capillary Wave Curvature Spectrum and Mean-Square Slope Retrieved from Microwave Radiometric Measurements (Coastal Ocean Probing Experiment)

Loading next page...
 
/lp/american-meteorological-society/gravity-capillary-wave-curvature-spectrum-and-mean-square-slope-wNd8PEzBZN
Publisher
American Meteorological Society
Copyright
Copyright © 1998 American Meteorological Society
ISSN
1520-0426
DOI
10.1175/1520-0426(2000)017<1259:GNCWCS>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

Brightness temperature of the sea surface is determined by surface waves of different scales. Polarimetric measurements collected by microwave radiometers at several viewing angles and frequencies give an opportunity to convert the observed brightness temperatures to the mean-square slope of long waves and curvature spectral density in the gravity––capillary interval without a priori assumptions about the shape of spectrum. Such an inversion was made using radiometric data collected during the Coastal Ocean Probing Experiment (COPE’’95) from a blimp. It is shown that at low and moderate wind speed conditions typical for COPE’’95 (4––7 m s −−1 ) the curvature spectrum has a maximum at wavenumber of about 4.5 rad cm −−1 , slightly higher than the wavenumber of the phase velocity minimum. The maximum corresponds to the wavenumber with the highest initial growth rate as predicted by theory for the growth rate of wind-induced gravity––capillary waves based on the Orr–– Sommerfeld equation. The author’’s estimation of the mean-square slope of surface waves is very close to the Cox and Munk values for stable and unstable atmospheric stratification. The radiometric results are compared with several gravity––capillary wave spectral models.

Journal

Journal of Atmospheric and Oceanic TechnologyAmerican Meteorological Society

Published: Dec 21, 1998

There are no references for this article.