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  • 1
    Publication Date: 2006-04-12
    Description: Nineteen stratospheric samples from the eruption plumes of Mount St. Helens were collected in five flight experiments. The plume samples were collected at various altitudes from 13.1 to 20.7 km by using the Ames cryogenic sampling system on board the NASA U-2 aircraft. The enriched, cryogenically collected samples were analyzed by chromatography. The concentrations of aerosols precursor gases (OCS, SO2, and CS2), CH3Cl, N2O, CF2Cl2, and CFCl3 were measured by gas chromatography. Large enhancement of the mixing ratio of SO2 and moderate enhancement of CS2 and OCS were found in the plume samples compared with similar measurement under pre-volcanic conditions. A fast decay rate of the SO2 mixing ratio in the plume was observed. Measurement of Cl(-), SO2(2-), and NO3(-) by ion chromatography was also carried out on water solutions prepared from the plume samples. The results obtained with this technique imply large mixing ratios of HCl, (NO + NO2 + HNO3), and SO2, in which these constituents are the respective sources of the anions. Measurement of the Rn222 concentration in the plume was made. Other stratospheric constituents in the plume samples, such as H2O, CO2, CH4, and CO, were also observed.
    Keywords: GEOPHYSICS
    Type: Atmospheric Effects and Potential Climatic Impact of the 1980 Eruptions of Mt. St. Helens; p 47-54
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  • 2
    Publication Date: 2011-08-16
    Description: Xenon resonance lamp with high spectral purity, discussing construction, life and refilling ease
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; TROPHYSICAL JOURNAL
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  • 3
    Publication Date: 2011-08-17
    Description: Minor constituents in the atmosphere can play an important role as tracers in studies of atmospheric transport and mixing. Simultaneous measurements of the vertical distribution of trace constituents in the troposphere and lower stratosphere were conducted in the region of the Intertropical Convergence Zone (ITCZ). An effort was made to measure the mixing ratios of selected trace constituents. A cryogenic sampling system on board a U-2 aircraft was used to acquire whole-air samples and to cryogenically collect samples at 13.7 to 21.3 km. Simultaneous tropospheric measurements using whole-air sampling canisters on board a Learjet aircraft were also carried out.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: The 1977 Intertrop. Convergence Zone Expt.; p 51-60
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  • 4
    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
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  • 5
    Publication Date: 2011-08-16
    Description: The measurements reported were conducted with 30.0 torr CO, 40.0 torr argon, and varying amounts of carbon dioxide from about 20 to 230 torr. Measurements were made at 277, 272, 263, and 257 K. The pseudo-first-order decay rate as a function of carbon dioxide pressure is shown in a graph. An Arrhenius plot for the rate constants obtained from the measurements is also presented. A value for the activation energy was determined on the basis of a linear least-squares fit to the data.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 61; Aug. 15
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  • 6
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: The fluorescence intensity of the H2 Lyman bands excited by the argon 1066 A line is found to be a linear function of the H2 pressure. The fluorescence from naturally occurring HD is linearly dependent on the HD partial pressure. The experiments described show that these fluorescence intensities can be used to measure the H2 and HD densities below 10 trillion molecules per cu cm.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 65
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  • 7
    Publication Date: 2011-08-12
    Description: Carbon dioxide tetrad band line intensity and widths quantitative measurements, considering agreement with Boltzmann distribution
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; L AVIV AND HAIFA, IS
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  • 8
    Publication Date: 2011-08-11
    Description: Proton bombardment for generation of polar glow aurora
    Keywords: GEOPHYSICS
    Type: JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
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  • 9
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    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 59
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  • 10
    Publication Date: 2011-08-18
    Description: A continuum source with three different interference filters and two different monochromatic sources were used to photolyze OCS in the region from 200 nm to 300 nm. The total quantum yield for the production of CO was measured, and the results indicate a primary quantum yield of 0.72 + or - 0.08. Absorption cross sections for OCS measured at 0.5-nm intervals are reported as well as the percent change in absorption upon cooling to 195 K. The structured features in the absorption are reinvestigated and discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Oct. 20
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