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  • ENVIRONMENT POLLUTION  (3)
  • SPACECRAFT INSTRUMENTATION  (2)
  • 2020-2021
  • 1980-1984  (5)
  • 1950-1954
  • 1
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    Seasat-A satellite scatterometer instrument evaluation (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Seasat-A satellite scatterometer (SASS) was designed to measure ocean surface wind speed and direction in twenty-four independent cells over a 1000-km swath. It operated in the interrupted CW mode at a frequency of 14.6 GHz with four fan beam antennas and used Doppler filtering in the receiver for resolving the cells on the surface. The instrument began operating in space on July 6, 1978, and gathered normalized radar cross section data for approximately 2290 h. The purpose of this paper is to describe the in-orbit evaluation of the SASS hardware and its compatibility with the spacecraft. It has been determined that the scatterometer operated flawlessly throughout the mission, met all design requirements, and established a good data base for geophysical processing.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Journal of Oceanic Engineering; OE-5; Apr. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Atmospheric transport of pollutants from North America to the North Atlantic Ocean (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Ground-based measurements strongly support the hypothesis that pollutant materials of anthropogenic origin are being transported over long distances in the midtroposphere and are a significant source of acid rain, acid snow, trace metal deposition, ozone and visibility-reducing aerosols in remote oceanic and polar regions of the Norhern Hemisphere. Atmospheric sulphur budget calculations and studies of acid rain on Bermuda indicate that a large fraction of pollutant materials emitted into the atmosphere in eastern North America are advected eastwards over the North Atlantic Ocean. The first direct airborne measurements of the vertical distribution of tropospheric aerosols over the western North Atlantic is reported here. A newly developed airborne differential adsorption lidar system was used to obtain continuous, remotely sensed aerosol distributions along its flight path. The data document two episodes of long-distance transport of pollutant materials from North America over the North Atlantic Ocean.
    Keywords: ENVIRONMENT POLLUTION
    Type: Nature (ISSN 0028-0836); 308; 722-724
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    In situ correlative measurements for the ultraviolet differential absorption lidar and the high spectral resolution lidar air quality remote sensors: 1980 PEPE/NEROS program (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In situ correlative measurements were obtained with a NASA aircraft in support of two NASA airborne remote sensors participating in the Environmental Protection Agency's 1980persistent elevated pollution episode (PEPE) and Northeast regional oxidant study (NEROS) field program in order to provide data for evaluating the capability of two remote sensors for measuring mixing layer height, and ozone and aerosol concentrations in the troposphere during the 1980 PEPE/NEROS program. The in situ aircraft was instrumented to measure temperature, dewpoint temperature, ozone concentrations, and light scattering coefficient. In situ measurements for ten correlative missions are given and discussed. Each data set is presented in graphical and tabular format aircraft flight plans are included.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TM-83107
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Validation of temperature retrievals obtained by the Limb Infrared Monitor of the Stratosphere (LIMS) experiment on Nimbus 7 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An outline is given of LIMS temperature determinations (as a function of pressure) from measurements in two channels covering portions of the 15-micrometer band of carbon dioxide. The known sources of error from the radiometer and data reduction are used to estimate the systematic and random errors expected of the results. Observational determinations of the complete end-to-end precision are obtained by computing the standard deviation of six sequential temperature retrievals in regions where the atmosphere is horizontally uniform. This yields values of 0.2 to 0.6 K, in reasonable agreement with the estimates. A correction for horizontal gradients in the atmosphere leads to a large reduction in the differences between the stratospheric temperatures determined on the ascending and descending portions of the orbit. The temperatures agree in the mean with radiosondes and rocketsondes to within 1-2 K in most regions below 1 mbar. Several interesting, previously unseen features included cold regions in the mid-latitude mesosphere and wavelike vertical variations in the tropics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 5147-516
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Carbon monoxide measurements in the troposphere (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Approximately 35 hours of radiometric measurements were obtained of the CO mixing ratio in the middle troposphere, upper troposphere, and lower stratosphere, by means of the Measurement of Air Pollution from Satellites (MAPS) experiment carried in the OSTA-1 payload of the second Space Shuttle flight. In view of gas filter radiometer data in the 4.67-micron band, gathered over the 38 N-38 S latitude region during both daytime and nighttime, the performance of MAPS was excellent. Significant gradients have been found in the middle tropospheric CO mixing ratio with both latitude and longitude over the North Atlantic, the Mediterranean Sea, and the Middle East.
    Keywords: ENVIRONMENT POLLUTION
    Type: Science; 218; Dec. 3
    Format: text
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    NASA TECHNICAL REPORTS
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