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  • American Geophysical Union (AGU)  (2)
  • 1985-1989  (2)
Material
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  • American Geophysical Union (AGU)  (2)
Language
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  • 1985-1989  (2)
Year
  • 1
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1986
    In:  Journal of Geophysical Research: Oceans Vol. 91, No. C2 ( 1986-02-15), p. 2450-2460
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 91, No. C2 ( 1986-02-15), p. 2450-2460
    Abstract: The results of this research show that the directional spectrum and the microwave modulation transfer function (MTF) of ocean waves can be measured with the airborne two‐frequency scatterometer‐microwave resonance technique. By combining two‐frequency backscatter resonance intensity with estimates of the directional wave spectrum (obtained by the airborne surface contour radar) and the known radar beam geometry, it was possible to solve for the unknown MTF using a system equation that has been verified in previous studies. Similar to tower‐based operations, the aircraft measurements of the MTF show that it is strongly affected by both wind speed and sea state. Also detected were small differences in the magnitudes of the MTF between downwind and upwind radar look directions, and variations with ocean wave number. Unexpected results were obtained, which indicate the MTF inferred from the two‐frequency radar is larger than that measured using single‐frequency/wave orbital velocity/Doppler techniques such as tower‐based radars or ROWS (remote ocean wave spectrometer) from low‐altitude aircraft. Possible reasons for this are discussed. When independent MTF data are combined with two‐frequency resonance intensities over a suitable variety of azimuthal look directions, then estimates of the surface wave directional spectrum can be made, to within the accuracy of the uncertainties in the individual data sets.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1986
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  • 2
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 1985
    In:  Eos, Transactions American Geophysical Union Vol. 66, No. 46 ( 1985-11-12), p. 763-765
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 66, No. 46 ( 1985-11-12), p. 763-765
    Abstract: Cooperative research by scientists of the United States and the People's Republic of China (PRC) has resulted in important new findings concerning the fundamental characteristics of earthquakes and new insight into mitigating earthquake hazards. Much of the research is being conducted under the U.S. State Department Protocol for Scientific and Technical Cooperation in Earthquake Studies between the PRC State Seismological Bureau (SSB) and the U.S. Geological Survey and the National Science Foundation. Activities and progress accomplished under the protocol will be the subject of two special sessions at the 1985 AGU Fall Meeting in San Francisco, Calif. A special session in tectonophysics will emphasize cooperative activities in earthquake prediction research and intraplate faulting, and a special session in seismology will examine earth structure and seismicity. A delegation of 20 scientists from China will join their American colleagues in presenting papers on cooperative research.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1985
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