Far infrared measurement of stratospheric HCl

Thermal emission from three rotational lines of H(Cl-35) and H(Cl-37) was observed with a Fourier transform spectrometer from a balloon platform at 28.9 km. The measured HCl line-of-sight density at 1.9 deg elevation above 28.9 km is 4.7 + or - 1.3 x 10 to the 15th/sq cm, implying an average volume mixing ratio of 0.8 + or - 0.2 x 10 to the -9th at the mean sampling altitude of 32.5 km. For a uniform mixing ratio model, this corresponds to a vertical column density of 2.4 + or - 0.6 x 10 to the 14th/sq cm. This result is in reasonable agreement with near infrared spectroscopic determinations and an abundance from a chemical sampling technique of HCl at this altitude; a pressure modulator radiometer measurement yields a significantly higher amount of HCl.

[1]  R. A. Toth,et al.  Simultaneous spectroscopic measurements of stratospheric species: O3, CH4, CO, CO2, N2O, H2O, HCl, and HF at northern and southern mid‐latitudes , 1980 .

[2]  D. Kendall,et al.  Simultaneous measurement of the volume mixing ratios of HCl and HF in the stratosphere , 1980 .

[3]  Jyrki K. Kauppinen,et al.  High-resolution spectrum of water vapor between 30 and 720 cm−1 , 1978 .

[4]  J. Greenberg,et al.  Midlatitude seasonal measurements of stratospheric acidic chlorine vapor , 1977 .

[5]  A S Zachor,et al.  Drive nonlinearities: their effects in Fourier spectroscopy. , 1977, Applied optics.

[6]  A. Miziolek.  Temperature dependence of foreign gas broadening of HCl fundamental lines , 1977 .

[7]  H. Roscoe,et al.  Radiometric measurement of stratospheric HCl , 1977, Nature.

[8]  Earl W. Smith,et al.  Calculations of rotational line widths in HCl perturbed by argon , 1977 .

[9]  D. Murcray,et al.  Measurement of the stratospheric mixing ratio of HCl using infrared absorption technique , 1976 .

[10]  W A Traub,et al.  Theoretical atmospheric transmission in the mid-and far-infrared at four altitudes. , 1976, Applied optics.

[11]  M. Ackerman,et al.  Stratospheric HCl from infrared spectra , 1976 .

[12]  C. Sawyer,et al.  K corona and magnetic sector boundaries , 1974 .

[13]  E. Kaiser.  Dipole Moment and Hyperfine Parameters of H35Cl and D35Cl , 1970 .

[14]  C. B. Farmer,et al.  Spectroscopic detection and vertical distribution of HCl in the troposphere and stratosphere , 1976 .

[15]  T. A. Wiggins,et al.  Breadths and shifts of molecular band lines due to perturbation by foreign gases , 1963 .