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

Karami, Khalil; Braesicke, Peter; Sinnhuber, Miriam; Versick, Stefan

Abstract:
We introduce a diagnostic tool to assess a climatological framework of the optimal propagation conditions for stationary planetary waves. Analyzing 50 winters using NCEP/NCAR (National Center for Environmental Prediction/National Center for Atmospheric Research) reanalysis data we derive probability density functions (PDFs) of positive vertical wave number as a function of zonal and meridional wave numbers. We contrast this quantity with classical climatological means of the vertical wave number. 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 vertical wave number 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. ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Steinbuch Centre for Computing (SCC)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-8447-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-599121
KITopen ID: 1000059912
HGF-Programm 12.04.03; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 13
Seiten 8447-8460
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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