INVESTIGADORES
DE LA TORRE Alejandro
congresos y reuniones científicas
Título:
Absolute Momentum Fluxes in the stratosphere with GPS Radio Occultation Data
Autor/es:
SCHMIDT, T., A. DE LA TORRE, P. ALEXANDER, F. LILIENTHAL, C. JACOBI, J. WICKERT
Lugar:
Graz
Reunión:
Workshop; OPAC-IROWG 2016; 2016
Institución organizadora:
Universidad de Graz
Resumen:
A mechanistic global circulation model is used to simulate the stratospheric, mesospheric and lower thermosphericcirculation during Austral winter. The model includes a gravity wave (GW) parameterization that is initiated by prescribedGW parameters in the troposphere. These are based on observations of GW potential energy calculated using GPS radiooccultations, but which is normalized to the same global mean amplitude. There is enhanced GW activity east of the Andes andaround the Antarctic. The model experiments 5 show that this realistic gravity wave distribution leads to additional forcing ofstationary planetary waves (SPWs) in the stratosphere, a weaker zonal wind jet in the mesosphere, cooling of the mesosphereand warming near the mesopause above the jet. SPW1 amplitudes are generally increased by about 10 %. However, at the upperpart of the zonal wind jet, SPW1 in zonal wind and GW acceleration are out of phase, which reduces the amplitudes there.