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  • GEOPHYSICS  (26)
  • 1995-1999  (1)
  • 1980-1984  (11)
  • 1975-1979  (14)
  • 1945-1949
  • 1
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    An intercomparison of carbon monoxide, nitric oxide, and hydroxyl measurement techniques - Overview of results (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results from an intercomparison of methods to measure carbon monoxide (CO), nitric oxide (NO), and the hydroxyl radical (OH) are discussed. The intercomparison was conducted at Wallops Island, Virginia, in July 1983 and included a laser differential absorption and three grab sample/gas chromatograph methods for CO, a laser-induced fluorescence (LIF) and two chemiluminescence methods for NO, and two LIF methods and a radiocarbon tracer method for OH. The intercomparison was conducted as a field measurement program involving ambient measurements of CO (150-300 ppbv) and NO (10-180 pptv) from a common manifold with controlled injection of CO in incremental steps from 20 to 500 ppbv and NO in steps from 10 to 220 pptv. Only ambient measurements of OH were made. The agreement between the techniques was on the order of 14 percent for CO and 17 percent for NO. Hardware difficulties during the OH tests resulted in a data base with insufficient data and uncertanties too large to permit a meaningful intercomposition.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 11819-11
    Format: text
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  • 2
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    A global magnetic anomaly map (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A subset of Pogo satellite magnetometer data has been formed that is suitable for analysis of crustal magnetic anomalies. Through the use of a thirteenth-order field model fit to these data, magnetic residuals have been calculated over the world to latitude limits of plus or minus 50 deg. These residuals, averaged over 1-degree latitude-longitude blocks, represent a detailed global magnetic anomaly map derived solely from satellite data. The occurrence of these anomalies on all individual satellite passes independent of local time and their decay as altitude increases imply a definite internal origin. Their wavelength structure and their correlation with known tectonic features further suggest that these anomalies are primarily of geologic origin and have their sources in the lithosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Feb. 10
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  • 3
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    Improved airborne measurements of OH in the atmosphere using the technique of laser-induced fluorescence (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Feb. 20
    Format: text
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  • 4
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    Direct measurements of natural tropospheric levels of OH via an aircraft borne tunable dye laser (1976)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; June 197
    Format: text
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  • 5
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    Comments on 'Theoretical and experimental assessment of the O3/H2O interference problem . . . in the detection of OH . . .' by Davis et al Geophys. Res. Letters 8, 68 /1981/ and ibid 8, 73 /1981/ (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 9; Jan. 198
    Format: text
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  • 6
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    Iodine - Its possible role in tropospheric photochemistry (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A detailed study of the photochemistry of iodine and its oxides indicates that iodine species may play an important role in the tropospheric photochemical system. Methyl iodide, often observed in the marine troposphere with an average concentration of 5-10 ppt, is photolyzed and thereby produces I atoms. Chemical interactions with O3, HxOy, and NOx cause I to be converted to other inorganic compounds such as IO, HOI, IONO2, and I2. The production of these species and their subsequent recycling back to I can lead to the catalytic removal of tropospheric O3, the enhancement of the NO2/NO ratio, the destruction of HxOy free radicals, and the conversion of HO2 to OH. Ultimately, tropospheric inorganic iodine is removed by heterogeneous processes. Calculations using a numerical model to simulate tropospheric photochemistry indicate that iodine may have a strong impact upon the atmospheric O3-NOx-HxOy system. The magnitude of these effects is dependent upon the value of several uncertain rate constants and the primary source distributions of CH3I and other organic and inorganic iodine compounds.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; Dec. 20
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  • 7
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    Active experiments using rocket-borne shaped charge barium releases (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A reliable payload system and scaled down shaped charges were developed for carrying out experiments in solar-terrestrial magnetospheric physics. Four Nike-Tomahawk flights with apogees near 450 km were conducted to investigate magnetospheric electric fields, and two Taurus-Tomahawk rockets were flown in experiments on the auroral acceleration process in discrete auroras. In addition, a radial shaped charge was designed for plasma perturbation experiments.
    Keywords: GEOPHYSICS
    Type: NASA-CR-162581
    Format: application/pdf
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  • 8
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    Report of the NASA working group on tropospheric program planning (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Increased understanding of the chemical phenomena occurring in the troposphere was the research goal. Emphasis was placed on tropospheric impact on environmental quality, including public health, agriculture, climate, and weather.
    Keywords: GEOPHYSICS
    Type: NASA-RP-1062 , L-13855
    Format: application/pdf
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  • 9
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    Aqueous-phase source of formic acid in clouds (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The coupled gas- and aqueous-phase cloud chemistry of HCOOH were examined for controlling factors in the acidity of cloud and rainwater. Attention was given to the aqueous OH/HO2 system that yields an OH species that is highly reactive with other species, notably SO2 and the formaldehyde/formic acid complex. A numerical model was developed to simulate the cloud chemistry in the remote troposphere, with considerations given to CH4-CO-NO(x)-O3-H(x)O(y) system. It was determined that aqueous phase OH radicals can produce and destroy formic acid droplets in daylight conditions, as well as control formic acid levels in rainwater. It is sugested that the same types of reactions may be involved in the control of acetic acid and other organic acids.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 304; Aug. 4
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  • 10
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    Mechanics of fold-and-thrust belts and accretionary wedges Cohesive Coulomb theory (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A self-consistent theory for the mechanics of thin-skinned accretionary Coulomb wedges is developed and applied to the active fold-and-thrust belt of western Taiwan. The state of stress everywhere within a critical wedge is determined by solving the static equilibrium equations subject to the appropriate boundary conditions. The influence of wedge cohesion, which gives rise to a concave curvature of the critical topographic surface and affects the orientation of the principal stresses and Coulomb fracture within the wedge, is considered. The shape of the topographic surface and the angles at which thrust faults step up from the basal decollement in the Taiwanese belt is analyzed taking into account the extensive structural and fluid-pressure data available there. It is concluded that the gross geometry and structure of the Taiwan wedge are consistent with normal laboratory frictional and fracture strengths of sedimentary rocks.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 10087-10
    Format: text
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