A review of applications of microwave radiometry to oceanography
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The thermal microwave radiation from the ocean surface as seen from space is a function of the surface temperature and wind speed and is modified by liquid water and water vapor in the intervening atmosphere. Further, if the ocean surface is frozen, the emissivity is drastically increased and the effect of the intervening atmosphere is generally negligible. The emissivity of first-year ice is somewhat larger than that of multi-year ice.
The data from the Electrically Scanning Microwave Radiometers (ESMR's) on the Nimbus-5 and —6 satellites operating at wavelengths of 1.55 cm and 8 mm, respectively, can be interpreted in terms of rain rate, ice coverage and first-year versus multi-year ice determination. The rain-rate data are being used to establish a climatology of rainfall over the oceans. The ice data are being used by the United States Navy in support of international scientific efforts in the Antactic region. Both ice and rain data sets have been generated for the Global Atmospheric Research Project Data Systems Test.
It is possible, by making multifrequency measurements, to separate the surface and atmospheric effects and to make useful measurements of sea surface temperature, surface wind speed, and atmospheric parameters along with improved measurements of rain and ice.
KeywordsEmissivity Rain Rate Surface Wind Speed Microwave Radiometer Scan Microwave
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- Gloersen, P., Nordberg, W., Schmugge, T. J., Wilheit, T. T., and Campbell, W. J.: 1973, ‘Microwave Signatures of First-year and Multi-year Sea Ice’,J. Geophys. Res. 78, 3564–3572.Google Scholar
- Gunn, K. L. S. and East, T. U. R.: 1954, ‘The Microwave Properties of Precipitation Particles’,Quart. J. Roy. Meteorol. Soc. 80, 522–554.Google Scholar
- Hollinger, J. P.: 1971, ‘Passive Microwave Measurements of Sea Surface Roughness’,Trans. IEEE Geoscience Electronics GE-9, 165–169.Google Scholar
- Jackson, J. D.:Classical Electrodynamics, John Wiley, New York, p. 216 ff.Google Scholar
- Lane, J. A., and Saxton, J. A.: 1952, ‘Dielectric Dispersion in Pure Polar Liquids at Very High Radio Frequencies’,Proc. Roy. Soc., London A214, 531–545.Google Scholar
- Nordberg, W., Conaway, J., Ross, D. B., and Wulheit, T.: 1971, ‘Measurements of Microwave Emission from a Foam-Covered Wind Driven Sea’,J. Atmos. Sci. 28, 429–435.Google Scholar
- Rao, M. S. V., Abbott, W. V., III, and Theon, J. S.: 1976, ‘Satellite-Derived Global Oceanic Rainfall Atlas’ (1973 and 1974), NASA X-911-76-116, Goddard Space Flight Center, Greenbelt, Maryland.Google Scholar
- Staelin, D. A.: 1966, ‘Measurements and Interpretation of the Microwave Spectrum of the Terrestrial Atmosphere Near 1 Centimeter Wavelength’,J. Geophys. Res. 71, 2875–2881.Google Scholar
- Staelin, D. H., Cassell, A. L., Kunzi, K. F., Pettyjohn, R. L., Poon, R. K. L., Rosenkranz, P. W., and Waters, J. W.: 1975, ‘Microwave Atmospheric Temperature Soundings: Effects of Clouds in the Nimbus-5 Satellite Data’J. Atmos. Sci. 32, 1970–1976.Google Scholar
- Waters, J. W., Kunzi, K. F., Pettyjohn, R. L., Poon, R. K. L., and Staelin, D. R.: 1975, ‘Remote Sensing of Atmospheric Temperature Profiles with the Nimbus-5 Microwave Spectrometer’,J. Atmos. Sci. 32, 1953–1969.Google Scholar
- Webster, W. J., Jr., Wilheit, T. T., Ross, D. B., and Gloersen, P.: 1976, ‘Spectral Characteristics of the Microwave Emission from a Wind Driven Foam-Covered Sea’,J. Geophys. Res. 81, 3095–3099.Google Scholar
- Wilheit, T.: 1972, ‘The Electrically Scanning Microwave Radiometer (ESMR) Experiment’, Nimbus-5 User's Guide, NASA/Goddard Space Flight Center, Greenbelt, Maryland, 59–105.Google Scholar
- Wilheit, T.: 1975, ‘The Electrically Scanning Microwave Radiometer (ESMR) Experiment’, Nimbus-6 User's Guide, NASA/Goddard Space Flight Center, Greenbelt, Maryland, 87–108.Google Scholar
- Wilheit, T., Blinn, J., Campbell, W., Edgerton, A., and Nordberg, W.: 1972, ‘Aircraft Measurements of Microwave Emission from Arctic Sea Ice’,Remote Sensing Environ. 2, 129–139.Google Scholar
- Wilheit, T., Rao, M. S. V., Chang, T. C., Rodgers, E. B., and Theon, J. S.: 1975, ‘A Satellite Technique for Quantatively Mapping Rainfall Rates over the Oceans’, NASA X-911-75-72.Google Scholar
- Wilheit, T., Theon, J. S., Shenk, W. E., Allison, L. J., and Rodgers, E. B.: 1976, ‘Meteorological Interpretations of the Images from the Nimbus 5 Electrically Scanned Microwave Radiometer’,J. Appl. Meteorol. 15, 166–172.Google Scholar
- Wilheit, T. T. and Fowler, M. G.: 1977, ‘Microwave Radiometric Determination of Wind Speed at the Surface of the Ocean During BESEX’, Joint Issue Trans.IEEE Ant. and Prop. 25, 111–120, and Trans. IEEE Oceanic Eng. 2, 111–120.Google Scholar