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  • 1
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    Measurement of stratospheric sulfur constituents (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: New measurements of mixing ratios of OCS in the lower stratosphere at midlatitude (Northern California) and high-latitude (Alaska) locations are reported which are in essential agreement with previous results. Weak signals due to stratospheric SO2 have been detected, and the estimated mixing ratios ranged from 36 to 51 pptv at altitudes 15.2 to 20.3 km. A very weak signal observed in the analysis is thought to be due to CS2 and, if this identification is correct, an upper limit concentration is estimated to be 1 pptv.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Resarch Letters; 8; Jan. 198
    Format: text
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  • 2
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    Trace gas measurements from whole air samples collected over the Antarctic continent (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Whole air samples collected aboard the NASA DC-8 and ER-2 aircraft as part of the Airborne Antarctic Ozone Experiment (AAOE) were analyzed in a field laboratory set up at Punta Arenas, Chile, in August and September, 1987. Mixing ratios obtained from gas chromatographic analyses of these samples are presented for N2O, CFCl3, CFCl2, C2F3Cl3, CH3CCl3, CH4, and CO. Variations in the mixing ratios of these gases along the individual flight paths of the aircraft are used as tracers to indicate the history of air masses over and near the Antarctic continent.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA, Goddard Space Flight Center, Polar Ozone Workshop. Abstracts; p 159
    Format: application/pdf
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  • 3
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    Lower stratosphere measurements of variation with latitude of CF2Cl2, CFCl3, CCl4, and N2O profiles in the northern hemisphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Measurements were made from a U-2 aircraft of profiles of CF2Cl2, CFCl3, CCl4 and N2O in the lower stratosphere in a meridional survey at a longitude of 159 deg W during the period October 1 to November 14, 1976. The latitude distributions obtained show a marked decrease in mixing ratio with increasing latitude from about 7 deg N in the Intertropical Convergence Zone to about 79 deg N. The results suggest the importance of meridional transport and mixing in the stratosphere in accounting, at least in part, for the observed profile variation with latitude. The contaminants C2F4Cl2, C2F3Cl3, CHCCl3 and SF6 were also detected but their mixing ratios were small and no accurate standards were prepared for them.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters; 5; Jan. 197
    Format: text
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  • 4
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    Stratospheric measurements of CF2Cl2 and N2O (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Concentrated samples of stratospheric air were obtained at pressure altitudes of 18.3 km and 21.3 km aboard U-2 aircraft, and at 28.3 km and 35.9 km aboard a balloon platform. The mixing ratios of CF2Cl2 and N2O are reported for locations in California, Oregon, Texas, and Quebec, Canada. The observed mixing ratios compare within a factor of 2 to those reported by other investigators and show a more rapid decrease with altitude than predicted by a two-dimensional model.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters; 5; May 1978
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  • 5
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    COS in the stratosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Carbonyl sulfide (COS) has been detected in the stratosphere, and mixing ratio measurements are reported for altitudes of 15.2 to 31.2 km. A large volume, cryogenic sampling system mounted on board a U-2 aircraft has been used for lower stratosphere measurements and a balloon platform for measurement at 31.2 km. These observations and measurements strongly support the concept that stratospheric COS is an important precursor in the formation of sulfuric acid aerosols.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters; 6; Mar. 197
    Format: text
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  • 6
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    Microcraters formed in glass by low density projectiles (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microcraters were produced in soda-lime glass by the impact of low density projectiles of polystyrene (p = 1.06 g/cu cm) with masses between 0.7 and 62 picograms and velocities between 2 and 14 km/s. The morphology of the craters depended on the velocity and the angle of incidence of the projectiles and these are discussed in detail. It was found that the transitions in morphology of the craters formed by polystyrene spheres occurred at higher velocities than they did for more dense projectiles.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-67469
    Format: application/pdf
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  • 7
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    In situ northern mid-latitude observations of ClO, O3, and BrO in the wintertime lower stratosphere (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: In order to test photochemical theories linking chlorofluorocarbon derivatives to O3 depletion at high latitudes in the springtime, several related atmospheric species, including O3, ClO, and BrO were measured in the lower stratosphere. The flight path extended to the center of the polar jet associated with but outside of the Arctic vortex, in which the abundance of O3 was twice its midlatitude value, whereas BrO levels were five parts per trillion (pptv) by volume between 18 and 21 km, and 2.4 pptv below that altitude. The ClO mixing ratio was as much as 65 pptv at 60 N latitude at an altitude of 20 km, and was enhanced over midlatitude values by a factor of three to five at altitudes above 18 km and by as much as a factor of 40 at altitudes below 17 km. Levels of ClO and O3 were highly correlated on all measured distance scales, and both showed an abrupt change in character at 54 N latitude. The ClO abundance north of 54 N was probably caused by low NO2 levels in the flight path.
    Keywords: ENVIRONMENT POLLUTION
    Type: Science (ISSN 0036-8075); 242; 558-562
    Format: text
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