Authors:	Polster, Christopher Wirth, Volkmar
Title:	A new atmospheric background state to diagnose local waveguidability
Online publication date:	19-Jan-2024
Year of first publication:	2023
Language:	english
Abstract:	A new procedure to obtain a longitudinally varying and slowly evolving atmospheric background state for the analysis of Rossby waveguides is described and discussed. The procedure is a rolling zonalization scheme, redistributing Ertel potential vorticity in a moving window to separate waves from the background. Waveguides are subsequently diagnosed from the gradient of the logarithm of potential vorticity. The effectiveness of the wave-background separation, even in large-amplitude conditions, is illustrated with reanalysis data. Established climatological-mean waveguide structures are recovered from the rolling-zonalized state in the limit of long-term aggregation. Two contrasting episodes of Rossby wave packet propagation demonstrate how the evolution of waveguides derived from rolling zonalization can correspond to the development of superposed wave packets. The ability of the procedure to work with snapshots of the atmosphere provides new opportunities for waveguide research.
DDC:	530 Physik 530 Physics 550 Geowissenschaften 550 Earth sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9946
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Geophysical research letters 50 24
Pages or article number:	e2023GL106166
Publisher:	Wiley
Publisher place:	Hoboken, NJ
Issue date:	2023
ISSN:	1944-8007
Publisher DOI:	10.1029/2023gl106166
Appears in collections:	DFG-491381577-G