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  • American Geophysical Union (AGU)  (4)
  • 1
    Online Resource
    Online Resource
    Organic material in the global troposphere
    American Geophysical Union (AGU) ; 1983
    In:  Reviews of Geophysics Vol. 21, No. 4 ( 1983-05), p. 921-952
    Details
    In: Reviews of Geophysics, American Geophysical Union (AGU), Vol. 21, No. 4 ( 1983-05), p. 921-952
    Abstract: Interest in the global tropospheric chemistry of organic materials has been growing rapidly over the past decade. In addition to a basic concern about the fundamental biogeochemical cycles of organic matter, this interest has arisen largely because of concern about the oxidant‐forming potential of natural hydrocarbons, the possible importance of nonmethane hydrocarbons as a source for atmospheric CO, and the role played by organic material in the formation of secondary aerosol particles. In this review we consider the information presently available on concentration distribution, sources, sinks, and atmospheric transformation reactions of organic matter in the global troposphere. The data base for tropospheric organic compounds is very small. However, it is apparent that while anthropogenic sources often dominate the atmospheric chemistry of organic material in urban and near‐urban air, a key to understanding the global cycling of tropospheric organic substances is a clear understanding of the interaction of the atmosphere with the terrestrial and marine biosphere.
    Type of Medium: Online Resource
    ISSN: 8755-1209 , 1944-9208
    URL: Article
    DOI: 10.1029/RG021i004p00921
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1983
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Sputtering, still the dominant source of plasma at Dione?
    American Geophysical Union (AGU) ; 1993
    In:  Eos, Transactions American Geophysical Union Vol. 74, No. 48 ( 1993-11-30), p. 569-573
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 74, No. 48 ( 1993-11-30), p. 569-573
    Abstract: It is generally assumed that the heavy‐ion plasma in the inner Saturnian magnetosphere is formed by the energetic plasma ions impacting and ejecting material from the icy satellites (Figure 1), a self‐sustained process known as ion sputtering [ Lanzerotti et al ., 1983; Eviatar , 1984; Richardson et al ., 1986]. Plasma‐ion sputtering of a surface is a well‐established laboratory technique for surface analysis and producing a vapor from a surface with a low vapor pressure; therefore, its potential relevance in Saturn's magnetosphere is intriguing. If the source of plasma in Saturn's inner magnetosphere is the surface of the icy satellites, then measurements of the composition of the freshly produced plasma can be used to determine the satellite surface composition [ Johnson and Sittler , 1990]. This exciting prospect may be realized during the proposed encounter of Cassini with Saturn's satellite Dione in ∼2005 because of the high mass resolution of the plasma instruments carried on the spacecraft.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/93EO00505
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Sputtering of water ice surfaces and the production of extended neutral atmospheres
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Planets Vol. 100, No. E12 ( 1995-12-25), p. 26387-26395
    Details
    In: Journal of Geophysical Research: Planets, American Geophysical Union (AGU), Vol. 100, No. E12 ( 1995-12-25), p. 26387-26395
    Abstract: Plasma and UV photon bombardment of an icy object in the outer solar system can lead to ejection of atoms and molecules from the surface which can, in turn, produce an extended neutral atmosphere. We present new laboratory studies of the sputtering of water ice by keV ions (H + through Ne + ) made using a sensitive microbalance technique that allows measurements at very low ion fluences. These results for the sputtering yield of ice by keV O + ions, the dominant sputtering agents in the Saturnian magnetosphere, are much larger than those used previously to model the neutral cloud associated with the icy satellites. The data presented are used to recalculate previously published sputtering rates for the icy satellites of Jupiter and Saturn, and for the E‐ring grains at Saturn. The new results can account, in part, for the discrepancy between the predicted and observed OH cloud near Tethys in Saturn's inner magnetosphere. We compare the yields induced by the incident ions to the recently measured UV photosputtering yield, and discuss possible synergism between UV photon and plasma ion induced erosion.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JE03099
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Mineralogy-based quantitative precipitation and temperature reconstructions from annually laminated lake sediments (Swiss Alps) since AD 1580
    American Geophysical Union (AGU) ; 2008
    In:  Geophysical Research Letters Vol. 35, No. 13 ( 2008-07-10)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 35, No. 13 ( 2008-07-10)
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2008GL034121
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
    Location Call Number Limitation Availability
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