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| Titel |
Arctic stratospheric dehydration – Part 1: Unprecedented observation of vertical redistribution of water |
| VerfasserIn |
S. M. Khaykin, I. Engel, H. Vömel, I. M. Formanyuk, R. Kivi, L. I. Korshunov, M. Krämer, A. D. Lykov, S. Meier, T. Naebert, M. C. Pitts, M. L. Santee, N. Spelten, F. G. Wienhold, V. A. Yushkov, T. Peter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 22 ; Nr. 13, no. 22 (2013-11-27), S.11503-11517 |
| Datensatznummer |
250085839
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| Publikation (Nr.) |
 copernicus.org/acp-13-11503-2013.pdf |
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| Zusammenfassung |
| We present high-resolution measurements of water vapour, aerosols and clouds
in the Arctic stratosphere in January and February 2010 carried out by
in situ instrumentation on balloon sondes and high-altitude aircraft
combined with satellite observations. The measurements provide unparalleled
evidence of dehydration and rehydration due to gravitational settling of ice
particles. An extreme cooling of the Arctic stratospheric vortex during the
second half of January 2010 resulted in a rare synoptic-scale outbreak of
ice polar stratospheric clouds (PSCs) remotely detected by the lidar aboard
the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) satellite. The widespread occurrence of ice clouds was followed
by sedimentation and consequent sublimation of ice particles, leading to
vertical redistribution of water inside the vortex. A sequence of balloon
and aircraft soundings with chilled mirror and Lyman- α hygrometers
(Cryogenic Frostpoint Hygrometer, CFH; Fast In Situ Stratospheric Hygrometer, FISH; Fluorescent Airborne Stratospheric Hygrometer, FLASH) and backscatter sondes (Compact Optical Backscatter Aerosol Detector, COBALD) conducted in January 2010
within the LAPBIAT (Lapland Atmosphere-Biosphere Facility) and RECONCILE (Reconciliation of
Essential Process Parameters for an Enhanced Predictability of Arctic
Stratospheric Ozone Loss and its Climate Interactions) campaigns captured various phases of this
phenomenon: ice formation, irreversible dehydration and rehydration.
Consistent observations of water vapour by these independent measurement
techniques show clear signatures of irreversible dehydration of the vortex
air by up to 1.6 ppmv in the 20–24 km altitude range and rehydration by up
to 0.9 ppmv in a 1 km thick layer below. Comparison with space-borne Aura
MLS (Microwave Limb Sounder) water vapour observations allow the spatiotemporal evolution of
dehydrated air masses within the Arctic vortex to be derived and upscaled. |
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