Ice particle formation and sedimentation in the tropopause region : a case study based on in-situ measurements of total water during POLSTAR 1997

Medientyp: E-Artikel
Titel: Ice particle formation and sedimentation in the tropopause region : a case study based on in-situ measurements of total water during POLSTAR 1997
Beteiligte: Schiller, C. [Verfasser:in]; Afchine, A. [Verfasser:in]; Zöger, M. [Verfasser:in]; Eicke, N. [Verfasser:in]; Feigl, C. [Verfasser:in]; Fischer, H. [Verfasser:in]; Giez, A. [Verfasser:in]; Konopka, V. E. [Verfasser:in]; Schlager, H. [Verfasser:in]; Tuitjer, F. [Verfasser:in]; Wienhold, F. G. [Verfasser:in]
Erschienen: American Geophysical Union, 1999
Erschienen in: Geophysical research letters 26, 2219 - 2222 (1999). doi:10.1029/1999GL900337
Sprache: Englisch
DOI: https://doi.org/10.1029/1999GL900337
ISSN: 0094-8276
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Beschreibung: During the Polar Stratospheric Aerosol Experiment, total water was measured using an airborne Lyman-alpha fluorescence hygrometer. The inlet is designed for anisokinetic sampling, thus large ice particles are detected sensitively. During the flight on January 24, 1997, temperatures of 200 K occurred close to the tropopause. Within this cold area, the existence of large particles with radii greater than or equal to 4 mu m containing large amounts of water is observed. At the edge of this cloud, total water mixing ratios of 5-6 ppmv and close to saturation were measured at and below the tropopause. This observation together with analysis of the correlation of the H2O mixing ratio with other long-lived tracers indicates that the air masses had been dried by sedimentation of large ice particles.
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