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  • 1990-1994  (5)
  • 1
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    The Finescale Structure of a West Texas Dryline (1991)
    American Meteorological Society
    Details
    Publication Date: 1991-05-01
    Print ISSN: 0027-0644
    Electronic ISSN: 1520-0493
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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    PAPER CURRENT
  • 2
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    On the use of IR lidar and K(sub a)-band radar for observing cirrus clouds (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Advances in lidar and radar technology have potential for providing new and better information on climate significant parameters of cirrus. Consequently, the NOAA Wave Propagation Lab. is commencing CLARET (Cloud Lidar And Radar Exploratory Test) to evaluate the promise of these new capabilities. Parameters under study include cloud particle size distribution, height of cloud bases, tops, and multiple layers, and cloud dynamics revealed through measurement of vertical motions. The first phase of CLARET is planned for Sept. 1989. The CO2 coherent Doppler lidar and the sensitive K sub a band radar hold promise for providing valuable information on cirrus that is beyond the grasp of current visible lidars.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA, Langley Research Center, FIRE Science Results 1989; p 487-490
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Transportable Lidar for the Measurement of Ozone Concentration and Flux Profiles in the Lower Troposphere (1992)
    In:  CASI
    Details
    Publication Date: 2014-09-25
    Description: In many areas of the United States, as well as in other industrial areas (such as Europe), elevated and potentially harmful levels of ozone are being measured during summer. Most of this ozone is photochemically produced. The relatively long lifetime of ozone allows industrially produced ozone to be transported on a hemispheric scale. Since the trends of tropospheric ozone are very likely dependent on the source strengths and distributions of the pollutants and the chemical/ transport process involved, a predictive understanding of tropospheric ozone climatology requires a focus on the chemical and transport processes that link regional emissions to hemispheric ozone trends and distributions. Of critical importance to these studies is a satisfactory data base of tropospheric ozone distribution from which global and regional tropospheric ozone climatology can be derived, and the processes controlling tropospheric ozone can be better understood. A transportable lidar for measuring ozone concentration and flux profiles in the lower troposphere is needed. One such system is being developed at the National Oceanic and Atmospheric Administration/Earth Resources Laboratory (NOAA/ERL) Wave Propagation Laboratory (WPL).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, Sixteenth International Laser Radar Conference, Part 1; p 185-187
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Low-level atmospheric flows studied by pulsed Doppler lidar (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: A pulsed Doppler radar gains a tremendous advantage in studying atmospheric flows when it has the ability to scan. The Wave Propagation Laboratory (WPL) has been operating a scanning, 10.59 micron CO2 system for over 10 years. Recently, the WPL lidar has been a featured instrument in several investigations of mesoscale wind fields in the lowest 3-4 km of the atmosphere. These include four experiments: a study of the initiation and growth of the sea breeze off the coast of California, a study of the snake column of a prescribed forest fire, a study of the nighttime flow over the complex terrain near Rocky Flats, Colorado as it affects the dispersion of atmospheric contaminants, and a study of the wind flow in the Grand Canyon. We have analyzed much data from these experiments, and we have found that the lidar provides new insight into the structure of these flows. Many of these studies took place in rugged or mountainous terrain, thus using one of the major benefits of the lidar: the narrow, 90 microrad beam of the lidar makes it an ideal instrument for studying flow close to topography.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 385-388
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Coherent CO2 lidar: A superior system for observing clouds? (1992)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Lidars have long been used to study various parameters of clouds. NOAA's Wave Propagation Laboratory has operated a coherent CO2 lidar for over a decade, using Doppler to study wind fields and turbulence, atmospheric absorption for Differential Absorption Lidar (DIAL) applications, backscatter to investigate aerosol distributions, and backscatter and extinction measurements on clouds. A system under development for our laboratory promises to overcome the older system's problems of large size, frequency instability, and need for continual operator attention. We are also thoroughly evaluating the capabilities of CO2 lidar for observing clouds, including development of some new techniques. CO2 lidar provides a view of clouds different in many ways from that of lidars at other extinction measurements from clouds. This discussion argues in support of the proposition: coherent CO2 lidar can be a superior lidar system for measuring most cloud properties.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 501-504
    Format: text
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    NASA TECHNICAL REPORTS
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