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Stratospheric HBr mixing ratio obtained from far infrared emission spectra
Author(s) -
Park J. H.,
Carli B.,
Barbis A.
Publication year - 1989
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/gl016i008p00787
Subject(s) - mixing ratio , zenith , stratosphere , bromine , spectral line , troposphere , isotope , analytical chemistry (journal) , emission spectrum , infrared , materials science , environmental science , atmospheric sciences , physics , chemistry , optics , environmental chemistry , astronomy , quantum mechanics , metallurgy
Emission features of HBr isotopes have been identified in high‐resolution far‐infrared emission spectra obtained with a balloon‐borne Fourier transform spectrometer in the spring of 1979 at 32°N latitude. When six single‐scan spectra at a zenith angle of 93.2° were averaged, two features of HBr isotopes at 50.054 and 50.069 cm −1 were obtained with a signal‐to‐noise ratio of 2.5. The volume mixing ratio retrieved from the average spectrum is 2.0 × 10 −11 , which is assumed to be constant above 28 km, with an uncertainty of 35 percent. This stratospheric amount of HBr is about the same as the current level of tropospheric organic bromine compounds, 25 pptv. Thus, HBr could be the major stratospheric bromine species.