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  • Other Sources  (6)
  • METEOROLOGY AND CLIMATOLOGY  (6)
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  • Other Sources  (6)
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  • 1
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    Estimation of raindrop size distribution parameters from a dual-parameter spaceborne radar measurement (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A method to estimate raindrop size distribution (DSD) parameters from a combined Zm profile and path-integrated attenuation is shown, and a test result of the method using the data from an aircraft experiment is presented. The 'semi' dual-parameter (SDP) measurement is employed to estimate DSD parameters using the data obtained from an aircraft experiment conducted by Communications Research Laboratory, Tokyo, in conjunction with NASA. The validity of estimated DSD parameters is examined using measured Ka-band radar reflectivities. The estimated path-averaged N(0) is consistent with the Ka/X Ze ratio, and the use of estimated DSD shows excellent agreement between the rain rates estimated from the X-band and K-band Zes. The feasibility of estimating DSD parameters from space is confirmed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: In: International Conference on Radar Meteorology, 25th, Paris, France, June 24-28, 1991, Preprints (A93-37626 15-47); p. 384-387.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Tropical Rainfall Measuring Mission (TRMM) project. III - Japan-U.S. collaborative rain observation experiment using an airborne rain radar (1990)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A collaborative rain-observation experiment using an airborne rain radar was conducted between Communications Research Laboratory (CRL) and Goddard Space Flight Center (GSFC)/NASA. CRL provided an airborne rain-radar/radiometer system and GSFC/NASA provided a NASA P3-A aircraft. Airborne or spaceborne rain-radar echoes have large sea or land-surface echoes. These surface echoes yield rain-estimation algorithms using rain attenuation. The experiment demonstrated the potential of the rain-estimation techniques using rain attenuation.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Communications Research Laboratory, Review (ISSN 0914-9279); 36; 11, J; 35-44
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    NASA TECHNICAL REPORTS
  • 3
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    Tropical Rainfall Measuring Mission (TRMM) project. V - Scientific background and goals of TRMM (1990)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The scientific goals of TRMM are described. TRMM provides quantitative measurements of tropical rain which can improve the understanding of the global climate. TRMM can also help to improve techniques for measuring rainfall from space.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Communications Research Laboratory, Review (ISSN 0914-9279); 36; 11, J; 57-70
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Dual-parameter radar rainfall measurement from space - A test result from an aircraft experiment (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An aircraft experiment has been conducted with a dual-frequency (X/Ka-bands) radar to test various rainfall retrieval methods from space. The authors test a method to derive raindrop size distribution (DSD) parameters from the combination of a radar reflectivity profile and a path-integrated attenuation derived from surface return, which may be available from most spaceborne radars. The estimated DSD parameters are reasonable in that the values generally fall within the range of commonly measured ones and that shifts in DSD parameters appear to be correlated with changes in storm type. The validity of the estimation result is also demonstrated by a consistency check using the Ka-band reflectivity profile which is independent of the DSD estimation process. Although errors may occur in the cases of nonuniform beam filling, these test results indicate the feasibility of the dual-parameter radar measurement from space in achieving a better accuracy in quantitative rainfall remote measurements.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 29; 690-703
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    NASA TECHNICAL REPORTS
  • 5
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    Airborne radar and radiometer experiment for quantitative remote measurements of rain (1989)
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    Publication Date: 2011-08-19
    Description: An aircraft experiment has been conducted with a dual-frequency (10 GHz and 35 GHz) radar/radiometer system and an 18-GHz radiometer to test various rain-rate retrieval algorithms from space. In the experiment, which took place in the fall of 1988 at the NASA Wallops Flight Facility, VA, both stratiform and convective storms were observed. A ground-based radar and rain gauges were also used to obtain truth data. An external radar calibration is made with rain gauge data, thereby enabling quantitative reflectivity measurements. Comparisons between path attenuations derived from the surface return and from the radar reflectivity profile are made to test the feasibility of a technique to estimate the raindrop size distribution from simultaneous radar and path-attenuation measurements.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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    NASA TECHNICAL REPORTS
  • 6
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    Range profiling of the rain rate by an airborne weather radar (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A class of methods based on a measure of path attenuation that is used to constrain the Hitschfeld-Bordan solution is investigated. Such methods are investigated for lidar, radar, and combined radar-radiometer applications. Their function is to allocate the attenuation in proportion to the strength of the measured reflectivity. A description is provided of four estimates of rain rate that have been tested using data from a dual-wavelength airborne radar at 10 GHz and 35 GHz. It is concluded, that when attenuation is significant, the estimates are generally more accurate than those without attenuation correction. Thus, such methodologies can be utilized to extend the effective dynamic range of the radar to higher rain rates.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Remote Sensing of Environment (ISSN 0034-4257); 31; 193-209
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    NASA TECHNICAL REPORTS
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