In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 89, No. D5 ( 1984-08-20), p. 7259-7266
Abstract:
High‐resolution infrared solar absorption spectra recorded from a balloon‐borne platform at 33‐km altitude and an aircraft at 12‐km altitude have been analyzed to derive simultaneous stratospheric concentrations of H 2 O, HDO, and CH 4 . The data were obtained near 33°N with the University of Denver interferometer during a balloon flight in October 1979 and with the NCAR interferometer aboard a Sabreliner aircraft in September 1982. The analysis of the balloon spectra indicates the H 2 O mixing ratio increased from 3.5 to 4.8 ppmv and the CH 4 mixing ratio decreased from 1.15 to 0.70 ppmv between 18 to 38 km. Tunable diode laser laboratory spectra were recorded and analyzed to derive absolute intensities and air‐broadened half widths of selected lines of the v 2 band of HDO. With these parameters, which are reported here, an HDO profile that increases from 0.61 ppbv near 18 km to 0.88 ppbv near 29 km is inferred from the balloon spectra, corresponding to a D/H ratio, normalized to the reference value of 158 atomic parts per million of Standard Mean Ocean Water (SMOW), of 0.55 to 0.67. The average D/H value of 0.40 above 12 km, derived from the aircraft spectra, provides additional spectroscopic evidence for a large depletion in the D content of water vapor in the lower stratosphere. The simultaneous vertical profiles for the three gases retrieved from the balloon spectra are consistent, within the estimated precision of the data (±10%), with methane oxidation as the sole source of stratospheric H 2 O in addition to H 2 O transported upward through the tropopause. However, there is an indication of a small increase in the total hydrogen in H 2 O and CH 4 with altitude, and we believe more precise simultaneous measurements are required.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JD089iD05p07259
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1984
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