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  • OCEANOGRAPHY  (2)
  • COMMUNICATIONS AND RADAR  (1)
  • 1
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    Air-sea interaction and remote sensing (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The first part of the proposed research was a joint effort between our group and the Applied Physics Laboratory (APL), University of Washington. Our own research goal is to investigate the relation between the air-sea exchange processes and the sea state over the open ocean and to compare these findings with our previous results obtained over a small body of water namely, Lake Washington. The goals of the APL researchers are to study (1) the infrared sea surface temperature (SST) signature of breaking waves and surface slicks, and (2) microwave and acoustic scattering from water surface. The task of our group in this joint effort is to conduct measurements of surface fluxes (of momentum, sensible heat, and water vapor) and atmospheric radiation (longwave and shortwave) to achieve our research goal as well as to provide crucial complementary data for the APL studies. The progress of the project is summarized.
    Keywords: OCEANOGRAPHY
    Type: NASA-CR-190913 , NAS 1.26:190913
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Relationship between wind, waves and radar backscatter (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The aim of the research was to investigate the relationship between wind, waves, and radar backscatter from water surface. To this end, three field experiments with periods of 2 to 4 weeks were carried out during summer months in 1988, 1989 and 1990. For these periods, the University of Washington group provided (1) environmental parameters such as wind speed, wind stress, and atmospheric stratification through measurements of surface fluxes (of momentum, sensible heat and latent heat) and of air and water temperatures; and (2) wave height spectra including both the dominant waves and the short gravity-capillary waves. Surface flux measurements were performed by using our well tested instruments: a K-Gill twin propeller-vane anemometer and a fast response thermocouple psychrometer. Wave heights were measured by a resistance wire wave gauge. The University of Kansas group was responsible for the operation of the microwave radars.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-190912 , NAS 1.26:190912
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Identification of atmospheric fronts over the ocean with microwave measurements of water vapor and rain (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper describes some basic research techniques and algorithms developed to diagnose fronts in cyclonic storms over the ocean with data from satellite-borne microwave radiometers. Methods are developed for flagging strong gradients in integrated atmospheric water vapor and the presence of rain by using data from the SSMR on board the polar orbiting Seasat and Nimbus-7 satellites. Examination of 65 frontal systems showed that the water vapor gradient flag correctly identified 86 percent of the fronts, while the precipitation flagged 91 percent. The two types of flags emphasize different portions of the cyclone and are therefore complementary. Ultimately, these techniques are intended for operational use with data from the Special Sensor Microwave Imager which was launched in June 1987 on a satellite in the Defense Meteorological Satellite Program (DMSP).
    Keywords: OCEANOGRAPHY
    Type: Weather and Forecasting (ISSN 0882-8156); 4; 449-460
    Format: text
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    NASA TECHNICAL REPORTS
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