Skip to Main content Skip to Navigation
Journal articles

Diurnal variation of nitric oxide in the upper stratosphere

Abstract : Two recent measurements of the temporal variation of nitric oxide at constant altitude near 40 km are reported. The observations were made at float altitude with a balloon-borne chemiluminescence detector together with in situ ozone measurements. The first measurement was made at 44øN on September 17, 1987, at an altitude of 40 km from before sunrise until 1000 LT. The second observation was made at the same latitude on June 18, 1988 at 39 km from 0800 to 1230 LT. The precision of the NO measurements is about 10% at these altitudes, obtained through a more accurate determination of the sample flow rate at pressures down to 2 mbar with a reduced ozone/oxygen flow rate. At an altitude of 40 km, nitric oxide was observed to start increasing very rapidly at sunrise when the solar zenith angle reached about 95 ø. After the rapid initial buildup, the rate of NO increase stabilized for 3 hours at about 1.2 ppbv/hour. Near 1100 LT at 39 km in summer the NO mixing ratio was observed to become nearly constant. These features of the diurnal variation of NO are in accord with the temporal variation expected from a time-dependent zero-dimensional photochemical model. Mixing ratios of NOy and N205 have been determined from the measured temporal variation of NO at 39.5 4-0.5 km, using the photochemical model of Pirre et al. (1989). These derived values of the NOy and N205 mixing ratios, 15.54-5.0 ppbv and 1.44-0.6 ppbv, respectively, are in good agreement with other recent measurements by balloon-borne and space-borne infrared experiments.
Document type :
Journal articles
Complete list of metadatas

Cited literature [34 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-02796542
Contributor : Nathalie Pothier <>
Submitted on : Friday, June 5, 2020 - 1:48:05 PM
Last modification on : Friday, June 12, 2020 - 3:43:22 AM

File

JD095iD13p22513.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Y. Kondo, P Aimedmu, Michel Pirre, W. Matthews, R. Ramaroson, et al.. Diurnal variation of nitric oxide in the upper stratosphere. Journal of Geophysical Research, American Geophysical Union, 1990, 95 (D13), pp.22513. ⟨10.1029/JD095iD13p22513⟩. ⟨insu-02796542⟩

Share

Metrics

Record views

26

Files downloads

39