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  • 1
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    Aircraft studies of size-dependent aerosol sampling through inlets (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Representative measurement of aerosol from aircraft-aspirated systems requires special efforts in order to maintain near isokinetic sampling conditions, estimate aerosol losses in the sample system, and obtain a measurement of sufficient duration to be statistically significant for all sizes of interest. This last point is especially critical for aircraft measurements which typically require fast response times while sampling in clean remote regions. This paper presents size-resolved tests, intercomparisons, and analysis of aerosol inlet performance as determined by a custom laser optical particle counter. Measurements discussed here took place during the Global Backscatter Experiment (1988-1989) and the Central Pacific Atmospheric Chemistry Experiment (1988). System configurations are discussed including (1) nozzle design and performance, (2) system transmission efficiency, (3) nonadiabatic effects in the sample line and its effect on the sample-line relative humidity, and (4) the use and calibration of a virtual impactor.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; 3815-382
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of CO2 backscatter using Mie theory from aerosol measurements over Pacific Basin with lidar data (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of a comparison of aerosol backscatter with measurements over the Pacific Basin obtained from the CW CO2 lidars are presented. Both the Laser Optical Particle Counter (POPC) and CW CO2 lidars performed measurements at the flight level close to the aircraft and measured the same air mass. From the number distributions measured during a flight over Tokyo in June 1990, the backscatter coefficient for each component is calculated by integrating the differential backscatter. Fifteen sets of number distributions measured by the LOPC during the flight are used to predict aerosol backscatter. The backscatter from microphysics of the aerosols obtained from the LOPC and from the lidar measurements are in good agreement. It is concluded that the size distribution and composition of the aerosols can change dramatically as a function of altitude and location. The magnitude of the aerosol backscatter can vary by over three orders of magnitude from clear air to an aerosol layer.
    Keywords: GEOPHYSICS
    Type: Symposium on Meteorological Observations and Instrumentations; Jan 14, 1991 - Jan 18, 1991; New Orleans, LA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Aerosol size distribution, composition, and CO2 backscatter (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The aerosol size distribution, composition, and CO2 backscatter at 10.6 microns (beta-CO2) were measured continuosly at the Mauna Loa Observatory (Hawaii) during January-March and November-December, 1988 periods to compare the characteristics of periods associated with appreciable Asian dust transport to that site (January-March) with those of periods characterized by low-dust condition. The aerosol size distribution in the range 0.15 micron to 7.6 microns was measured at temperatures of 40, 150, and 340 C to differentiate between volatile and nonvolatile aerosols. Large ranges of variability was found in measurements of aerosol size distribution during both periods, but the average distributions were similar for both the high-dust and the low-dust periods. However, values for beta-CO2 were more elevated (by about six times) during periods associated with active Asian dust transport to the observatory site than during the low-dust periods.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 5237-524
    Format: text
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    NASA TECHNICAL REPORTS
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