Observation of NOy uptake by particles in the arctic tropopause region at low temperatures

Measurements pf gas- and condensed-phase NOy, HNO3, O-3, and particle concentration and size were performed on 24 January 1997 during POLSTAR on a flight through an ice cloud. In the ice cloud below the tropopause only 2 to 4 pptv particle NOy were detected. The observed average mixing ratio of tota...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Feigl, C., Schlager, H., Ziereis, H., Curtis, J., Arnold, F., Schiller, C.
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 1999
Subjects:
info:eu-repo/classification/ddc/550
J
Arctic
Online Access:https://juser.fz-juelich.de/record/39930
https://juser.fz-juelich.de/search?p=id:%22PreJuSER-39930%22
Description
Summary:Measurements pf gas- and condensed-phase NOy, HNO3, O-3, and particle concentration and size were performed on 24 January 1997 during POLSTAR on a flight through an ice cloud. In the ice cloud below the tropopause only 2 to 4 pptv particle NOy were detected. The observed average mixing ratio of total HNO3 is significantly larger than the detected particle NOy. Considering the combined error limits of the NOy and KNO3 measurements, however, it cannot be ruled out that the observed uptake of NOy was limited by the available gas-phase HNO3. The ratio of total HNO3 to gaseous NOy measured during the cirrus cloud penetration amounts only to 0.2 in contrast to 0.9 in the stratospheric part of the flight.

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