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  • 1
    Online Resource
    Online Resource
    On the production of ionization by micrometeorites
    American Geophysical Union (AGU) ; 1967
    In:  Journal of Geophysical Research Vol. 72, No. 13 ( 1967-07-01), p. 3497-3501
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 72, No. 13 ( 1967-07-01), p. 3497-3501
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JZ072i013p03497
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1967
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  • 2
    Online Resource
    Online Resource
    New measurements of the NO 2 absorption cross section in the 440‐ to 460‐nm region and estimates of the NO 2 ‐N 2 O 4 equilibrium constant
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Atmospheres Vol. 98, No. D9 ( 1993-09-20), p. 16857-16863
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 98, No. D9 ( 1993-09-20), p. 16857-16863
    Abstract: Absolute determinations of the NO 2 absorption cross section in the 440‐ to 460‐nm region at different temperatures are reported. This region is of special interest for remote sensing applications. The interpretation of the results is rendered complex by the coexistence of NO 2 and its dimer. In the experiment both NO 2 and N 2 O 4 absorption features are observed. Different approaches are utilized to obtain the partial pressure of NO 2 ; a new estimate of the NO 2 ‐N 2 O 4 equilibrium constant from spectroscopic measurements is also obtained. Within experimental errors the overall shape of the spectrum does not show a dependence on temperature, but some features are affected; in particular, a slight increase of a few maxima and a decrease of the other maxima and of the minima when the temperature is lowered have been observed.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/93JD01582
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 3
    Online Resource
    Online Resource
    Volcanic aerosol layers observed by lidar at South Pole, September 1991-June 1992
    American Geophysical Union (AGU) ; 1993
    In:  Geophysical Research Letters Vol. 20, No. 9 ( 1993-05-07), p. 807-810
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 20, No. 9 ( 1993-05-07), p. 807-810
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/93GL00897
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 4
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    Online Resource
    Lidar observations of polar stratospheric clouds at the South Pole: 2. Stratospheric perturbed conditions, 1992 and 1993
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Atmospheres Vol. 102, No. D11 ( 1997-06-20), p. 12945-12955
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 102, No. D11 ( 1997-06-20), p. 12945-12955
    Abstract: Observations of polar stratospheric clouds (PSCs), carried out at the Amundsen Scott South Pole Station by lidar from May 1992 through October 1993, are reported and compared with previously obtained results. At that time the Antarctic stratosphere was loaded with sulfuric acid aerosol due to the eruptions of Mount Pinatubo, primarily, and of Mount Hudson. The seasonal evolution of the backscatter profiles has been investigated in relation to the presence of the volcanic aerosol and to the processes of PSC formation, particle sedimentation, and dehydration. During the first winter after the eruptions the PSC activity was more intense than in the following year, particularly above 12.5 km, where the amount of volcanic aerosol was larger in 1992 than in 1993. At lower altitudes the volcanic aerosol loading as well as the PSC phenomenon were comparable during the 2 years. No substantial changes in the signal due to the volcanic aerosol has been observed comparing the backscattering profiles before and after the PSC periods (June‐September), except for a downward shift, attributed to the subsidence of the air inside the polar vortex. It is concluded that only a small fraction of the aerosol particles, probably those with the largest radii, were involved in the nucleation of PSC particles.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JD00361
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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  • 5
    Online Resource
    Online Resource
    Lidar observations of the Pinatubo aerosol layer at Thule, Greenland
    American Geophysical Union (AGU) ; 1994
    In:  Geophysical Research Letters Vol. 21, No. 13 ( 1994-06-22), p. 1295-1298
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 21, No. 13 ( 1994-06-22), p. 1295-1298
    Abstract: Lidar measurements of the stratospheric aerosol content have been carried out in Thule (Greenland), in connection with the European Arctic Stratospheric Ozone Experiment (EASOE). Aerosols attributable to the Pinatubo eruption were detected in the stratosphere late in September; during autumn and early winter the stratospheric aerosol load slowly increased. In the region above approximately 18 km the aerosol load depended on the location of the station relative to the polar vortex. A temporary increase of the aerosol concentration was detected up to about 26 km at the beginning of February, when Thule was located for a few days outside the vortex. A final increase of the aerosol load was related with the final breakup of the vortex. The aerosol integrated backscatter values ranged between 0.001 and 0.005 sr −1 during most of the winter, and increased up to 0.007 sr −1 in early spring; in this period the aerosol columnar mass was estimated to be as high as 0.1 g m −2 .
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/93GL02892
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 6
    Online Resource
    Online Resource
    Equilibrium temperatures of spherical ice particles in the upper atmosphere and implications for noctilucent cloud formation
    American Geophysical Union (AGU) ; 1977
    In:  Journal of Geophysical Research Vol. 82, No. 6 ( 1977-02-20), p. 961-966
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 82, No. 6 ( 1977-02-20), p. 961-966
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JC082i006p00961
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1977
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  • 7
    Online Resource
    Online Resource
    Optical radar results and ionospheric sporadic E
    American Geophysical Union (AGU) ; 1965
    In:  Journal of Geophysical Research Vol. 70, No. 9 ( 1965-05-01), p. 2213-2215
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 70, No. 9 ( 1965-05-01), p. 2213-2215
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JZ070i009p02213
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1965
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  • 8
    Online Resource
    Online Resource
    Absorption cross sections of ozone in the 590‐ to 610‐nm region at T = 230 K and T = 299 K
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Atmospheres Vol. 95, No. D12 ( 1990-11-20), p. 20565-20568
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 95, No. D12 ( 1990-11-20), p. 20565-20568
    Abstract: Measurements of the ozone absorption cross section in the 590‐ to 610‐nm region of the Chappuis bands have been carried out at the temperatures T = 230 K and T = 299 K. Ozone is produced with an electrical discharge and stored cryogenically. Differential absorption measurements are obtained in a slowly evolving mixture of ozone and molecular oxygen. Previous results by other authors indicate a certain disagreement on the temperature dependence of the absorption cross section. Our data at each wavelength show no significant dependence of the absorption coefficient on the temperature, within experimental errors. The statistical consistency of the results is discussed.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JD095iD12p20565
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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  • 9
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    Online Resource
    Evolution of temperature, O 3 , CO, and N 2 O profiles during the exceptional 2009 Arctic major stratospheric warming as observed by lidar and millimeter-wave spectroscopy at Thule (76.5°N, 68.8°W), Greenland : GROUND-BASED DATA ON THE 2009 ARCTIC SSW
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research: Atmospheres Vol. 115, No. D24 ( 2010-12-27)
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 115, No. D24 ( 2010-12-27)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2010JD014070
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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  • 10
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    Online Resource
    Stratospheric clouds at south pole during 1988 1. Results of lidar observations and their relationship to temperature
    American Geophysical Union (AGU) ; 1992
    In:  Journal of Geophysical Research: Atmospheres Vol. 97, No. D5 ( 1992-04-20), p. 5939-5946
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 97, No. D5 ( 1992-04-20), p. 5939-5946
    Abstract: An optical radar—lidar—has been operational at the Amundsen‐Scott South Pole Station since summer 1987–1988. The observations were specially directed to the detection of aerosol layers and polar stratospheric clouds (PSCs). The lidar utilized a Nd‐YAG laser followed by a second harmonic generator, and a 0.5‐m diameter Cassegrain receiving telescope. Results obtained during the period May–October 1988 are summarized. Some 10,000 profiles of the lidar echoes, each the result of 1‐min averaging, were obtained. Data sets consisting of profiles of the scattering ratio and of the backscattering cross section B a , based on half‐hour averaging, are presented. The data can be related to profiles of the atmospheric temperature T , usually obtained on a daily basis at South Pole. Stratifications appear to have two distinct types of structures: one structure shows only a modest variation with height; the other is characterized by sharp features, with large changes of the cross section with height. The basic results, the relationship between B a and T , and their statistical relevance are considered in this paper. The microphysical interpretation, the attribution of these structures to PSC Type I and Type II, respectively involving the condensation of nitric acid trihydrate and of water ice, and the seasonal evolution of the phenomena are treated in a companion paper.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JD03124
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1992
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    SSG: 16,13
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