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| Titel |
Microphysical modelling of a mid-latitude polar stratospheric cloud event: Comparisons against multiwavelength ground-based and spaceborne lidar data |
| VerfasserIn |
J. Jumelet, S. Bekki, P. Seifert, J. Pelon |
| 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 |
250021606
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| Zusammenfassung |
| A newly developed high resolution transport model containing a size-resolving microphysical scheme is used to study a large-scale polar stratospheric cloud (most certainly a liquid PSC) case detected by lidar at mid-latitudes between February 17th and 23rd, 2008. The model simulations are validated locally against ground-based lidar (IfT MARTHA lidar, Leipzig, Germany) and globally against spaceborne lidar (CALIOP/CALIPSO) backscatter measurements. The comparison between the spaceborne and ground-based lidar measurements above Leipzig is satisfactory with an average backscatter ratio of 3.1 observed on February 20th. The microphysical-transport model is found to be able to reproduce the lidar measurements when a 1 K cold bias is assumed for the ECMWF temperatures. Assuming a cold bias and equilibrated PSC particles, our model produces time-evolving fields of optical and geometrical parameters such as the total surface area density (A) and volume (V). A, V, and the median radius of the model-calculated PSC size distribution are compared to the corresponding values derived from the ground-based multiwavelength lidar backscatter measurements. Overall, a good agreement is found between the model calculations and the Leipzig lidar-derived size distribution parameters, with A and V around 10 µm2.cm-3 and 1 µm3.cm-3 respectively and a median radius of around 0.3 µm at 21 km. The horizontal extension of the cloud is analysed. Again, our model calculations are found to be in a good agreement with CALIOP/CALIPSO PSC fields. This type of successful validation of PSC parametrisations in chemistry-transport models is a prerequisite for the calculations of ozone depletion potential. |
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