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| Titel |
Measurements of ice particles in the UTLS during SCOUT and AMMA |
| VerfasserIn |
W. Frey, M. de Reus, S. Borrmann, C. Schiller, N. M. Sitnikov, A. Ulanovsky, F. Ravegnani |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022691
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| Zusammenfassung |
| In-situ measurements of ice crystal size distributions were performed within the tropical
troposphere and lower stratosphere. To achieve measurements over a broad size range a
combination of a Cloud Imaging Probe (CIP) and a Forward Scattering Spectrometer
Probe (FSSP-100), installed on the Russian high altitude research aircraft M55
Geophysica, was used. While the FSSP obtains ice particle size distributions in the size
range of 2-47μm, also single particle information along with particle shapes are
provided by the CIP as it delivers 2-dimensional shadow images of particles in the size
range of 25-1600μm. The data were acquired during the SCOUT-O3 campaign in
Darwin, Australia in 2005 and during AMMA, Ouagadougou, Burkina Faso in
2006.
In focus of both campaigns were measurements connected to convective systems. The
objective of the SCOUT campaign was to characterise the outflow of the Hector convective
system over the Tiwi Islands (north of Darwin). Whereas measurements of MCS close up and
MCS outflow were performed during AMMA. Comparisons of these data will be shown in
the presentation.
Amongst measurements of ice particle size distributions vertical distributions of effective
radius and IWC will be presented. A decrease of effective radius of the ice cloud
particles in the tropical troposphere has been found in altitudes of about 10km up to
the tropopause. In six cases during SCOUT ice clouds have been observed in the
stratosphere, up to 1.4km above the local tropopause. These encounters were a
result of overshooting convection from the outflow of the Hector storm system. |
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