J.C. Giampaolo

Pennsylvania State University, University Park, MD, United States

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Publications (3)3.47 Total impact

  • Source
    J.C. Giampaolo, C.S. Ruf
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    ABSTRACT: The excess microwave emissivity of the ocean surface due to winds at nadir incidence is derived from the TOPEX microwave radiometer and altimeter together with ocean surface data. The sensitivity of emissivity to wind speed is found to depend strongly on the air-sea temperature difference
    IEEE Transactions on Geoscience and Remote Sensing 11/2001; · 3.47 Impact Factor
  • Source
    J. Giampaolo, C.S. Ruf
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    ABSTRACT: Coincident measurement of ocean surface windspeed, temperature, and microwave emissivity reveal a clear dependence of the slope of the emissivity versus windspeed on the temperature. Water at higher temperatures has a greater increase in emissivity per unit wind speed. This temperature dependence is a residual result of the dependence of the specular ocean surface emissivity on temperature. As the temperature increases, specular microwave emissivity decreases. Since wind roughening and foam increase the emissivity, the increase with respect to the specular baseline is proportionately larger at higher temperatures
    Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International; 02/1999
  • Source
    C.S. Ruf, J.C. Giampaolo
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    ABSTRACT: The standard on orbit data processing used by all current and upcoming satellite altimetry missions (TOPEX/Poseidon, GEOSAT Follow On, and Jason-1) results in a radar altimeter footprint which is generally much smaller than the footprint of the microwave radiometer that is used to correct for path delay of the radar signal by tropospheric water vapor and clouds. As a result, the quality of ocean topology retrievals can be compromised in coastal environments even when the altimeter itself is still operating nominally. For example, the diameter of the TOPEX altimeter footprint is 3-5 km at typical wind speeds, but the radiometer has a 35 km footprint at 21 GHz. Because of this size disparity, wet path delay corrections are generally not considered reliable within approximately 50 km of a major coastline. We present here an antenna deconvolution procedure which is specifically intended to improve near-coastal retrieval of the wet tropospheric path delay correction by satellite altimeters. The procedure has immediate applications with archived and current TOPEX/Poseidon data, and will be applicable to the upcoming GFO and Jason-1 missions, for the imaging of ocean currents and tides in the littoral zone
    Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International; 08/1998

Publication Stats

2 Citations
3.47 Total Impact Points

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Institutions

  • 1998–2001
    • Pennsylvania State University
      • Department of Electrical Engineering
      University Park, MD, United States