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Stratospheric HCl from infrared spectra
Author(s) -
Ackerman M.,
Frimout D.,
Girard A.,
Gottignies M.,
Muller C.
Publication year - 1976
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl003i002p00081
Subject(s) - zenith , stratosphere , altitude (triangle) , mixing ratio , solar zenith angle , atmospheric sciences , wavelength , spectral line , infrared , absorption (acoustics) , physics , environmental science , absorption spectroscopy , astrophysics , optics , astronomy , mathematics , geometry
HCl has been observed in the stratosphere from balloon borne spectroscopic measurements of a portion of the fundamental band in the 3 microns wavelength region. The observation of absorption lines using the sun as a source at solar zenith angles larger than 90° indicates an HCl volume mixing ratio equal to (3.8 ± 1.5) × 10 −10 at 20 km increasing with altitude at least up to 30 km where the value is (1.4 ± 0.6) × 10 −9 . The total zenith amount above 21 km is found to be (10± 3.5) × 10 −14 cm −2 in agreement with previous observations performed up to this altitude. A maximum number density equal to (7.2 ± 3) × 10 8 cm −3 is observed at 24 ± 2 km altitude.