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Artículo

On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation

Lilienthal, Friederike; Jacobi, Christoph; Schmidt, Torsten; de la Torre, AlejandroIcon ; Alexander, Pedro ManfredoIcon
Fecha de publicación: 07/2017
Editorial: Copernicus Publications
Revista: Annales Geophysicae
ISSN: 1432-0576
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

A mechanistic global circulation model is used to simulate the Southern Hemisphere stratospheric, mesospheric, and lower thermospheric circulation during austral winter. The model includes a gravity wave (GW) parameterization that is initiated by prescribed 2-D fields of GW parameters in the troposphere. These are based on observations of GW potential energy calculated using GPS radio occultations and show enhanced GW activity east of the Andes and around the Antarctic. In order to detect the influence of an observation-based and thus realistic 2-D GW distribution on the middle atmosphere circulation, we perform model experiments with zonal mean and 2-D GW initialization, and additionally with and without forcing of stationary planetary waves (SPWs) at the lower boundary of the model. As a result, we find additional forcing of SPWs in the stratosphere, a weaker zonal wind jet in the mesosphere, cooling of the mesosphere and warming near the mesopause above the jet. SPW wavenumber 1 (SPW1) amplitudes are generally increased by about 10ĝ€% when GWs are introduced being longitudinally dependent. However, at the upper part of the zonal wind jet, SPW1 in zonal wind and GW acceleration are out of phase, which reduces the amplitudes there.
Palabras clave: Meteorology And Atmospheric Dynamics (Middle Atmosphere Dynamics)
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54432
URL: https://www.ann-geophys.net/35/785/2017/
DOI: http://dx.doi.org/10.5194/angeo-35-785-2017
Colecciones
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Lilienthal, Friederike; Jacobi, Christoph; Schmidt, Torsten; de la Torre, Alejandro; Alexander, Pedro Manfredo; On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation; Copernicus Publications; Annales Geophysicae; 35; 4; 7-2017; 785-798
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