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  • 1990-1994  (5)
  • 1
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    Increase in atmospheric CHF2Cl (HCFC-22) over southern California from 1985 to 1990 (1994)
    American Geophysical Union
    Details
    Publication Date: 1994-08-01
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    The Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment - The ATLAS-1 mission (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: ATMOS is an investigation of the chemistry and composition of the middle atmosphere using a modified Michelson interferometer designed to be carried on board the Space Shuttle. During orbital sunsets and sunrises it obtains high resolution infrared solar spectra every 2 seconds. The instrument was first flown on the Spacelab 3 mission in April, 1985, and is being reflown as part of the ATLAS series of payloads which started with the ATLAS-1 flight in March 1992. A summary of the results from the Spacelab 3 mission will be presented. These results included several first detections of critical atmospheric species in addition to the thirty or more constituents for which profiles were derived at altitudes between 10 and 150 km. Preliminary results from the ATLAS-1 mission will be described as part of an update to the status of this long term effort.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: In: Optical methods in atmospheric chemistry; Proceedings of the Meeting, Berlin, Germany, June 22-24, 1992 (A93-51501 22-35); p. 513-521.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Measurement of atmospheric composition by the ATMOS instrument from Table Mountain Observatory (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Following its first flight on board the Space Shuttle 'Challenger' as part of the Spacelab 3 payload, the Atmospheric Trace Molecule Spectroscopy (ATMOS) instrument has been operated at the Jet Propulsion Laboratory's Table Mountain Observatory (TMO; 34.4 deg N, 117.7 deg W, 2.23 km altitude) in the San Gabriel Mountains of Southern California. With the delay in the resumption of regular Shuttle flights, ATMOS has acquired a large number of high-quality, high-resolution infrared solar absorption spectra, spanning a period between late-1985 and mid-1990. These spectra are being analyzed to derive the column abundances of several atmospheric species including O3, HCl, HF, and HNO3. Although limited in temporal coverage, the preliminary results for these gases are discussed here in the context of the requirement and contribution to be made by similar instruments in detecting long term changes in stratospheric composition.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Remote sensing of atmospheric chemistry; Proceedings of the Meeting, Orlando, FL, Apr. 1-3, 1991 (A93-31376 11-35); p. 335-346.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Increase in atmospheric CHF2Cl (HCFC-22) over southern California from 1985 to 1990 (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Column densities of CHF2Cl (HCFC-22) have been measured over Table Mountain Facility (TMF), Wrightwood, California (34.4 deg N) using the Atmospheric Trace Molecule Spectroscopy (ATMOS) Fourier-transform infrared (FTIR) spectrometer. Between October 1985 and July 1990, the exponential column increase rate was (6.7 +/- 0.5)%/yr. Additionally, column measurements of CHF2Cl over McMurdo Sound, Antarctica (78 deg S) in September and October 1986 by the MarkIV FTIR spectrometer were used to derive a south-north interhemispheric ratio of (0.86 +/- 0.08). Model calculations investigated the feasibility of using CHF2Cl column measurements with a predicted global OH field to determine a globally averaged chemical lifetime for CHF2Cl, or equivalently, an estimate of the OH field using a predicted lifetime. The current uncertainty in historical CHF2Cl emissions is too large for CHF2Cl to be used to infer adequately either the lifetime or the OH field.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters (ISSN 0094-8276); 21; 16; p. 1723-1726
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    An Overview of the Relevant Results from the ATMOS Missions of 1985 and 1992 (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment employs a Fourier transform spectrometer to record infrared solar spectra at orbital sunrises and sunsets from on board the Space Shuttle. The data returned from 19 occultations covered by the instrument's first flight as part of the Spacelab 3 payload in April, 1985, have been analyzed for the profiles of some thirty atmospheric constituents. These results included a number of species not previously detected or measured, an investigation of the NO(y) and Cl(x) budgets, and, as a whole, have been used as the input for critically evaluating stratospheric photochemical models. The instrument was flown again on the ATLAS-1 shuttle mission in March, 1992, where it obtained data through nearly 100 solar occultation events located between latitudes of 30 deg N and 55 deg S. Results from the 1985 mission as well as preliminary results from the more recent 1992 flight are summarized here.
    Keywords: Solar Physics
    Type: NASA-CR-204424 , NAS 1.26:204424 , NATO ASI Series: The Role of the Stratosphere in Global Change; 1; 8; 387-401
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    NASA TECHNICAL REPORTS
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