Search for infrared absorption lines of atmospheric chlorine monoxide (ClO)

Abstract A search for features of the ClO (1-0) vibration-rotation band has been conducted based on a 5000 signal-to-r.m.s. noise ratio infrared (i.r.) spectrum derived by coadding 39 high-quality 0.0053-cm-1 resolution solar spectra recorded with the McMath Fourier transform spectrometer on Kitt Peak. Evidence for absorption has been found at the locations of several of the stronger ClO P-branch lines with minimal interference. Detailed results are presented for the P(8.5) and P(7.5) 2 Π 3 2 - 2 Π 3 2 lines of 35ClO at 833.2974 and 834.6249 cm-1, respectively. If ClO is present in the stratosphere at the concentrations indicated by other methods, our analysis indicates that modest improvements in signal-to-noise ratio and spectral resolution would permit a definitive detection of ClO in i.r. ground-based spectra.

[1]  J. Flaud.  Atlas of Ozone Spectral Parameters from Microwave to Medium Infrared , 1990 .

[2]  Philip D. Hammer,et al.  Infrared measurements of the ClO radical , 1987 .

[3]  Bruno Carli,et al.  Submillimeter measurement of stratospheric chlorine monoxide , 1988 .

[4]  M. Janssen.  Atmospheric Remote Sensing by Microwave Radiometry , 1993 .

[5]  A. Goldman,et al.  HNO3 line parameters: New results and comparisons of simulations with high-resolution laboratory and atmospheric spectra , 1992 .

[6]  C. B. Farmer,et al.  Stratospheric trace gases in the spring 1986 Antarctic atmosphere , 1987, Nature.

[7]  Philip D. Hammer,et al.  Infrared line intensity measurements in the v = 0–1 band of the ClO radical , 1989 .

[8]  V. Malathy Devi,et al.  The ν2 bands of 16O17O16O and 16O16O17O: Line positions and intensities , 1991 .

[9]  V. Malathy Devi,et al.  The vibrational and rotational spectra of ozone for the (0, 1, 0) and (0, 2, 0) states , 1988 .

[10]  Michael J. Kurylo,et al.  Network for the detection of stratospheric change , 1991, Defense, Security, and Sensing.

[11]  W. Brune,et al.  In situ observations of midlatitude stratospheric ClO and BrO , 1986 .

[12]  Midlatitude ClO below 22 km altitude: Measurements with a new aircraft-borne instrument , 1988 .

[13]  G. Stokes,et al.  The pure rotation spectrum of OH and the solar oxygen abundance , 1984 .

[14]  P. Solomon,et al.  Diurnal Variation of Stratospheric Chlorine Monoxide: A Critical Test of Chlorine Chemistry in the Ozone Layer , 1984, Science.

[15]  J. D. Rogers,et al.  Is There Any Chlorine Monoxide in the Stratosphere? , 1983, Science.

[16]  D. Toohey,et al.  The sunrise and sunset variation of ClO in the lower stratosphere , 1990 .

[17]  V. M. Devi,et al.  THE HITRAN MOLECULAR DATABASE: EDITIONS OF 1991 AND 1992 , 1992 .

[18]  V. Malathy Devi,et al.  The ν2 bands of 16O18O16O and 16O16O18O: Line positions and intensities , 1989 .

[19]  W. Brune,et al.  In situ observations of BrO over Antarctica: ER‐2 aircraft results From 54°S to 72°S latitude , 1989 .

[20]  Frank J. Murcray,et al.  Isotopic abundances of stratopheric ozone from balloon‐borne high‐resolution infrared solar spectra , 1989 .

[21]  C. B. Farmer,et al.  Infrared aircraft measurements of stratospheric composition over Antarctica during September 1987 , 1989 .

[22]  M. H. Smith.  Compilation of atmospheric gas concentration profiles from 0 to 50 km , 1982 .

[23]  M. Molina,et al.  Chlorofluoromethanes in the Environment , 1975 .

[24]  D. Toohey,et al.  In situ observations of ClO in the Arctic stratosphere: ER‐2 aircraft results from 59°N TO 80°N latitude , 1990 .

[25]  H. Pickett,et al.  Pressure broadening of ClO by nitrogen , 1981 .

[26]  L. Emmons,et al.  Formation of the Antarctic ozone hole by the CIO dimer mechanism , 1988, Nature.

[27]  P. Solomon,et al.  Chlorine oxide in the stratospheric ozone layer: ground-based detection and measurement. , 1981, Science.

[28]  R. L. Hawkins,et al.  Energy levels, intensities, and linewidths of atmospheric carbon dioxide bands , 1992 .

[29]  Robert Jarnot,et al.  ClO and O3 stratospheric profiles - Balloon microwave measurements , 1988 .

[30]  A. Goldman,et al.  Spectral line parameters for the pure rotation bands of solar OH , 1983 .