Eady edge waves, frontal wave-trains and type-B cyclogenesis

Eady edge waves (EEWs) propagate on surface baroclinic zones and they resemble synoptic and sub-synoptic scale frontal wave-trains. The wave-trains are frequently depicted on surface charts, and occur per se on a front with a local baroclinicity extremum. The possible linkage of EEWs to frontal wave...

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Autor principal:	Huw C. Davies
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	eady edge waves frontal wave-trains type-b cyclogenesis surface quasi-geostrophic dynamics Oceanography GC1-1581 Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/5aaa7f26fb614969b3ca13eee9f05107
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spelling	oai:doaj.org-article:5aaa7f26fb614969b3ca13eee9f051072021-12-01T14:40:58ZEady edge waves, frontal wave-trains and type-B cyclogenesis1600-087010.1080/16000870.2021.1899722https://doaj.org/article/5aaa7f26fb614969b3ca13eee9f051072021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/16000870.2021.1899722https://doaj.org/toc/1600-0870Eady edge waves (EEWs) propagate on surface baroclinic zones and they resemble synoptic and sub-synoptic scale frontal wave-trains. The wave-trains are frequently depicted on surface charts, and occur per se on a front with a local baroclinicity extremum. The possible linkage of EEWs to frontal waves is explored within the framework of so-called ‘surface quasi-geostrophic dynamics’ by establishing the properties of free and forced EEWs propagating on an ambient flow comprising a laterally confined baroclinic zone. It is shown that the dispersion properties of the free EEWs modes are influenced significantly both by the zone’s baroclinicity extremum and by key features that are akin to those of cold and warm fronts. In particular the larger-scale waves are nondispersive and a local wave-packet can retain coherency, the leading modes on a pseudo-cold front possess a phase speed related to the baroclinicity extremum, whereas waves on a pseudo-warm front propagate in the reverse direction. Also theoretical considerations demonstrate that forced modes can undergo resonant secular growth. It is further shown that transient or sustained forcing of a front by an upper-tropospheric potential vorticity anomaly (sic. short-wave trough) can serve to instigate features akin to frontal wave-trains and type-B cyclogenesis. More generally the study hints at the significance for NWP of a front’s structure and its dispersion properties, and that an element of predictability is introduced by the latter features due to dynamical scale selection.Huw C. DaviesTaylor & Francis Grouparticleeady edge wavesfrontal wave-trainstype-b cyclogenesissurface quasi-geostrophic dynamicsOceanographyGC1-1581Meteorology. ClimatologyQC851-999ENTellus: Series A, Dynamic Meteorology and Oceanography, Vol 73, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	eady edge waves frontal wave-trains type-b cyclogenesis surface quasi-geostrophic dynamics Oceanography GC1-1581 Meteorology. Climatology QC851-999
spellingShingle	eady edge waves frontal wave-trains type-b cyclogenesis surface quasi-geostrophic dynamics Oceanography GC1-1581 Meteorology. Climatology QC851-999 Huw C. Davies Eady edge waves, frontal wave-trains and type-B cyclogenesis
description	Eady edge waves (EEWs) propagate on surface baroclinic zones and they resemble synoptic and sub-synoptic scale frontal wave-trains. The wave-trains are frequently depicted on surface charts, and occur per se on a front with a local baroclinicity extremum. The possible linkage of EEWs to frontal waves is explored within the framework of so-called ‘surface quasi-geostrophic dynamics’ by establishing the properties of free and forced EEWs propagating on an ambient flow comprising a laterally confined baroclinic zone. It is shown that the dispersion properties of the free EEWs modes are influenced significantly both by the zone’s baroclinicity extremum and by key features that are akin to those of cold and warm fronts. In particular the larger-scale waves are nondispersive and a local wave-packet can retain coherency, the leading modes on a pseudo-cold front possess a phase speed related to the baroclinicity extremum, whereas waves on a pseudo-warm front propagate in the reverse direction. Also theoretical considerations demonstrate that forced modes can undergo resonant secular growth. It is further shown that transient or sustained forcing of a front by an upper-tropospheric potential vorticity anomaly (sic. short-wave trough) can serve to instigate features akin to frontal wave-trains and type-B cyclogenesis. More generally the study hints at the significance for NWP of a front’s structure and its dispersion properties, and that an element of predictability is introduced by the latter features due to dynamical scale selection.
format	article
author	Huw C. Davies
author_facet	Huw C. Davies
author_sort	Huw C. Davies
title	Eady edge waves, frontal wave-trains and type-B cyclogenesis
title_short	Eady edge waves, frontal wave-trains and type-B cyclogenesis
title_full	Eady edge waves, frontal wave-trains and type-B cyclogenesis
title_fullStr	Eady edge waves, frontal wave-trains and type-B cyclogenesis
title_full_unstemmed	Eady edge waves, frontal wave-trains and type-B cyclogenesis
title_sort	eady edge waves, frontal wave-trains and type-b cyclogenesis
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/5aaa7f26fb614969b3ca13eee9f05107
work_keys_str_mv	AT huwcdavies eadyedgewavesfrontalwavetrainsandtypebcyclogenesis
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Eady edge waves, frontal wave-trains and type-B cyclogenesis

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