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On the climatological probability of the vertical propagation of stationary planetary waves

Karami, K.; Braesicke, P.; Sinnhuber, M.; Versick, S.

Abstract:
We introduce a diagnostic tool to assess in a climatological framework the optimal propagation conditions for stationary planetary waves. Analyzing 50 winters using NCEP/NCAR reanalysis data we derive probability density functions (PDFs) of positive refractive indices as a function of zonal and meridional wave numbers. We contrast this quantity with classical climatological means of the refractive index. Introducing a Membership Value Function (MVF) based on fuzzy logic, we objectively generate a modified set of PDFs (mPDFs) and demonstrate their superior performance compared to the climatological mean of refractive indices and the original PDFs. We argue that mPDFs allow an even better understanding of how background conditions impact wave propagation in a climatological sense. As expected, probabilities are decreasing with increasing zonal wave numbers. In addition we discuss the meridional wave number dependency of the PDFs which is usually neglected, highlighting the contribution of meridional wave numbers 2 and 3 in the stratosphere. We also describe how mPDFs change in response to strong vortex regime (SVR) and weak vortex regime (WVR) conditions, with increased probabilities during WVR than SVR in the stratosphere. ... mehr

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Volltext §
DOI: 10.5445/IR/1000052455
Originalveröffentlichung
DOI: 10.5194/acpd-15-32289-2015
Coverbild
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7367, 1680-7375
urn:nbn:de:swb:90-524556
KITopen-ID: 1000052455
HGF-Programm 12.04.05 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics / Discussions
Band 15
Heft 22
Seiten 32289-32321
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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