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Zonal mean circulations for two conserved meridional coordinates

Egger, Joseph and Hoinka, Klaus-Peter (2015) Zonal mean circulations for two conserved meridional coordinates. Quarterly Journal of the Royal Meteorological Society, 141, pp. 518-524. Wiley. DOI: 10.1002/qj.2373 ISSN 0035-9009

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.2373/pdf

Abstract

While many investigations of the atmospheric zonalmean circulation have been published using various vertical coordinates, this article concentrates on meridional coordinates other than latitude. Potential vorticity q and potential temperature θ are selected, with height as the vertical coordinate. Both q and θ are conserved in adiabatic frictionless flow. Although this helps in the interpretation of the results, both choices are problematic because of contortions in the contours. The related problems are solved by integrating over suitable zonal tubes. The isertelic mean circulation exhibits global cells in the upper troposphere and separate shallow hemispheric cells near the ground. Mean q fluxes are derived from the mass circulation. The mean circulation in (θ, z) coordinates is similar to that in (ϕ, θ) coordinates and has hemispheric direct cells. Mean θ fluxes follow from that. Both circulations are forced, in the sense that they can be derived and understood if the zonal mean heating is known. This is demonstrated by explaining, for example, the equatorward surface flow in (θ, z) coordinates and the shallow boundary-layer circulation in the isertelic system.

Item URL in elib:https://elib.dlr.de/90034/
Document Type:Article
Title:Zonal mean circulations for two conserved meridional coordinates
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Egger, JosephLMU, MIMUNSPECIFIED
Hoinka, Klaus-PeterDLR, IPAUNSPECIFIED
Date:2015
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:141
DOI :10.1002/qj.2373
Page Range:pp. 518-524
Publisher:Wiley
ISSN:0035-9009
Status:Published
Keywords:zonal mean circulation; isentropic meridional coordinate; isertelic meridional coordinate
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Volkert, Dr. Hans
Deposited On:29 Jul 2014 06:59
Last Modified:17 Jun 2019 11:46

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