 |
| Titel |
Ice phase in altocumulus clouds over Leipzig: remote sensing observations and detailed modeling |
| VerfasserIn |
M. Simmel, J. Bühl, A. Ansmann, I. Tegen |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 18 ; Nr. 15, no. 18 (2015-09-24), S.10453-10470 |
| Datensatznummer |
250120046
|
| Publikation (Nr.) |
 copernicus.org/acp-15-10453-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
The present work combines remote sensing observations and detailed cloud
modeling to investigate two altocumulus cloud cases observed over Leipzig,
Germany. A suite of remote sensing instruments was able to detect primary ice
at rather high temperatures of −6 °C. For comparison, a second
mixed phase case at about −25 °C is introduced. To further look
into the details of cloud microphysical processes, a simple dynamics model of
the Asai-Kasahara (AK) type is combined with detailed spectral microphysics
(SPECS) forming the model system AK-SPECS. Vertical velocities are prescribed
to force the dynamics, as well as main cloud features, to be close to the
observations. Subsequently, sensitivity studies with respect to ice
microphysical parameters are carried out with the aim to quantify the most
important sensitivities for the cases investigated.
For the cases selected, the liquid phase is mainly determined by the model
dynamics (location and strength of vertical velocity), whereas the ice phase
is much more sensitive to the microphysical parameters (ice nucleating
particle (INP) number, ice particle shape). The choice of ice particle shape
may induce large uncertainties that are on the same order as those for the
temperature-dependent INP number distribution. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|