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

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 troposp...

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Detalles Bibliográficos
Autores principales:	Lilienthal, F., Jacobi, C., Schmidt, T., De La Torre, A., Alexander, P.
Formato:	JOUR
Materias:	Meteorology and atmospheric dynamics (middle atmosphere dynamics) atmospheric general circulation model gravity wave mesosphere parameterization Southern Hemisphere stratosphere thermosphere winter
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09927689_v35_n4_p785_Lilienthal
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09927689_v35_n4_p785_Lilienthal
record_format	dspace
spelling	todo:paper_09927689_v35_n4_p785_Lilienthal2023-10-03T15:55:44Z On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation Lilienthal, F. Jacobi, C. Schmidt, T. De La Torre, A. Alexander, P. Meteorology and atmospheric dynamics (middle atmosphere dynamics) atmospheric general circulation model gravity wave mesosphere parameterization Southern Hemisphere stratosphere thermosphere winter 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09927689_v35_n4_p785_Lilienthal
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Meteorology and atmospheric dynamics (middle atmosphere dynamics) atmospheric general circulation model gravity wave mesosphere parameterization Southern Hemisphere stratosphere thermosphere winter
spellingShingle	Meteorology and atmospheric dynamics (middle atmosphere dynamics) atmospheric general circulation model gravity wave mesosphere parameterization Southern Hemisphere stratosphere thermosphere winter Lilienthal, F. Jacobi, C. Schmidt, T. De La Torre, A. Alexander, P. On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
topic_facet	Meteorology and atmospheric dynamics (middle atmosphere dynamics) atmospheric general circulation model gravity wave mesosphere parameterization Southern Hemisphere stratosphere thermosphere winter
description	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.
format	JOUR
author	Lilienthal, F. Jacobi, C. Schmidt, T. De La Torre, A. Alexander, P.
author_facet	Lilienthal, F. Jacobi, C. Schmidt, T. De La Torre, A. Alexander, P.
author_sort	Lilienthal, F.
title	On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
title_short	On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
title_full	On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
title_fullStr	On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
title_full_unstemmed	On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation
title_sort	on the influence of zonal gravity wave distributions on the southern hemisphere winter circulation
url	http://hdl.handle.net/20.500.12110/paper_09927689_v35_n4_p785_Lilienthal
work_keys_str_mv	AT lilienthalf ontheinfluenceofzonalgravitywavedistributionsonthesouthernhemispherewintercirculation AT jacobic ontheinfluenceofzonalgravitywavedistributionsonthesouthernhemispherewintercirculation AT schmidtt ontheinfluenceofzonalgravitywavedistributionsonthesouthernhemispherewintercirculation AT delatorrea ontheinfluenceofzonalgravitywavedistributionsonthesouthernhemispherewintercirculation AT alexanderp ontheinfluenceofzonalgravitywavedistributionsonthesouthernhemispherewintercirculation
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On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation

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