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  • METEOROLOGY AND CLIMATOLOGY  (1)
  • atmospheric spectra  (1)
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  • 1
    ISSN: 1436-5073
    Keywords: atmospheric spectra ; radiometry ; cryogenic instruments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The SCRIBE (Stratospheric CRyogenic Interferometer Balloon Experiment) system was flown August 10, 1986, over eastern New Mexico. Because the SCRIBE sensor is a liquid nitrogen cooled interferometer, absolute radiance data were obtained with good resolution (0.1 cm−1) and high sensitivity. The normal field of view was reduced to ~0.2° (80 m on the ground) by a 12′' Dall-Kirkham telescope, and was steered by remote control using television cameras boresighted with the infrared sensor. The stabilized viewing allowed “staring” at selected features for considerable periods of time. The data sets thus include spectra of different terrain features, as well as substantially different atmospheric paths to one feature. Both the data and the SCRIBE equipment are described.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: We conducted year-around measurements of mid infrared atmospheric emission over the South Pole in 1992. We were able to observe a large seasonal change of the total column of nitric acid (HNO3) vapor. During the summer the HNO3 column abundance was about 2 x 10(exp 16) molecules/sq cm. There was a small increase in the fall. A rapid decrease of 50% was observed in late June, soon after the stratospheric temperature reached the threshold for formation of type I polar stratospheric clouds (PSCs). By early July, the stratospheric temperature was cold enough to form type II PSCs, and the HNO3 column decreased to 7 x 10(exp 15) molecules/sq cm. Measured nitric acid values in the spring remained extremely low even after the stratosphere warmed well above PSC temperatures. This may indicate permanent removal of HNO3 by gravitational settling, or long-term sequestering in large particles. Normal summer values were not observed until the vortex dissipated and allowed the lateral transport of HNO3 to the south polar region.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Geophysical Research Letters (ISSN 0094-8276); 22; 1; p. 49-52
    Format: text
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