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    PEM-West trajectory climatology and photochemical model sensitivity study prepared using retrospective meteorological data (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Trajectory and photochemical model calculations based on retrospective meteorological data for the operations areas of the NASA Pacific Exploratory Mission (PEM)-West mission are summarized. The trajectory climatology discussed here is intended to provide guidance for flight planning and initial data interpretation during the field phase of the expedition by indicating the most probable path air parcels are likely to take to reach various points in the area. The photochemical model calculations which are discussed indicate the sensitivity of the chemical environment to various initial chemical concentrations and to conditions along the trajectory. In the post-expedition analysis these calculations will be used to provide a climatological context for the meteorological conditions which are encountered in the field.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-188128 , NAS 1.26:188128
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Nitrate in the atmospheric boundary layer of the tropical South Pacific - Implications regarding sources and transport (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Weekly bulk aerosol samples collected at three sites in the tropical South Pacific from 1983 to 1987 are analyzed. The mean nitrate concentrations obtained for the sites range from 0.107 to 0.117 microg/cu m. The results suggest that the region is minimally affected by the transport of soil material and pollutants from the continents. Measurements from sites in the tropical North Pacific show mean nitrate concentrations that are about three times higher than those in the South Pacific, showing that the North Pacific is significantly impacted by the transport of material from Asia and North America. The relationships between the nitrate concentrations to other constituents at American Samoa are discussed, including nonseasalt sulfate, Pb-210, and Be-7.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric Chemistry (ISSN 0167-7764); 8; 391-415
    Format: text
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    NASA TECHNICAL REPORTS
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