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Wave Forcing of Zonal Mean Angular Momentum in Various Coordinate Systems

Egger, Joseph and Hoinka, Klaus-Peter (2014) Wave Forcing of Zonal Mean Angular Momentum in Various Coordinate Systems. Journal of the Atmospheric Sciences, 71 (6), pp. 2221-2229. American Meteorological Society. DOI: 10.1175/JAS-D-13-0111.1 ISSN 0022-4928

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Official URL: http://journals.ametsoc.org/doi/abs/10.1175/JAS-D-13-0111.1


The wave forcing of the atmospheric mean flow in isentropic coordinates has been investigated intensively in the past with the divergence of the Eliassen–Palm flux playing a dominating role. These concepts are reviewed briefly and it is pointed out that angular momentum is attractive in this context because the wave driving can be written in the form of a flux divergence. This helps to evaluate the wave forcing in other coordinate systems with a different separation of waves and mean flow. The following coordinates are chosen: (lambda, phi, z), (lambda, phi, theta), and (lambda, theta, z). To be consistent, only one type of zonal averaging should be used. Massweighted averaging is applied in the isentropic standard case and simple averaging is applied in the others. The wave driving is presented for all three systems. It has to balance essentially the mean-flow part of the ‘‘Coriolis term’’ in the angular momentum budget in (phi, z) and (theta, z) coordinates but not in the (phi, theta) system where the form drag is a mean-flow term and, therefore, the forcing pattern differs from what has been published so far.

Item URL in elib:https://elib.dlr.de/90006/
Document Type:Article
Title:Wave Forcing of Zonal Mean Angular Momentum in Various Coordinate Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:June 2014
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1175/JAS-D-13-0111.1
Page Range:pp. 2221-2229
Publisher:American Meteorological Society
Keywords:Wellenanregung, Drehimpuls, Eliassen-Palm-Fluss
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:28 Jul 2014 07:59
Last Modified:06 Sep 2019 15:27

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