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| Titel |
Physics of Stratocumulus Top (POST): turbulent mixing across capping inversion |
| VerfasserIn |
S. P. Malinowski, H. Gerber, I. Jen-La Plante, M. K. Kopec, W. Kumala, K. Nurowska, P. Y. Chuang, D. Khelif, K. E. Haman |
| 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. 24 ; Nr. 13, no. 24 (2013-12-17), S.12171-12186 |
| Datensatznummer |
250085882
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| Publikation (Nr.) |
 copernicus.org/acp-13-12171-2013.pdf |
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| Zusammenfassung |
| High spatial resolution measurements of temperature and liquid water
content, accompanied by moderate-resolution measurements of humidity
and turbulence, collected during the Physics of Stratocumulus Top
experiment are analyzed. Two thermodynamically, meteorologically and
even optically different cases are investigated. An algorithmic
division of the cloud-top region into layers is proposed. Analysis
of dynamic stability across these layers leads to the conclusion
that the inversion capping the cloud and the cloud-top region is
turbulent due to the wind shear, which is strong enough to overcome the high static stability of the inversion. The thickness
of this mixing layer adapts to wind and temperature jumps such that
the gradient Richardson number stays close to its critical
value. Turbulent mixing governs transport across the inversion, but
the consequences of this mixing depend on the thermodynamic
properties of cloud top and free troposphere. The effects of
buoyancy sorting of the mixed parcels in the cloud-top region are
different in conditions that permit or prevent cloud-top entrainment
instability. Removal of negatively buoyant air from the cloud top is
observed in the first case, while buildup of the diluted cloud-top
layer is observed in the second one. |
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