Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries
Adequate representations of diverse dynamical processes in general circulation models (GCM) are necessary to obtain reliable simulations of the present and the future. The parameterization of orographic gravity wave drag (GWD) is one of the critical components of GCM. It is therefore convenient to e...
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2011
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paper:paper_02731177_v48_n8_p1359_Alexander2023-06-08T15:25:40Z Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries Alexander, Pedro M. Ruscica, Romina Sorensson, Anna Amelia Menendez, Claudio Guillermo Gravity waves Momentum Numerical simulations 20th century Atmospheric changes Atmospheric model Critical component Down-scaling Dynamical process General circulation model Gravity wave momentum Grid cells Horizontal resolution Intergovernmental panel on climate changes Mesoscale simulation Midlatitudes Momentum flux Orographic gravity waves Parameterizations Seasonal patterns Source level Southern Hemisphere Subgrid scale Climate models Global warming Gravity waves Greenhouse gases Hydrodynamics Landforms Momentum Waves Computer simulation Adequate representations of diverse dynamical processes in general circulation models (GCM) are necessary to obtain reliable simulations of the present and the future. The parameterization of orographic gravity wave drag (GWD) is one of the critical components of GCM. It is therefore convenient to evaluate whether standard orographic GWD parameterizations are appropriate. One alternative is to study the generation of gravity waves (GW) with horizontal resolutions that are higher than those used in current GCM simulations. Here we assess the seasonal pattern of topographic GW momentum flux (GWMF) generation for the late 20th and 21st centuries in a downscaling using the Rossby Centre regional atmospheric model under the Intergovernmental Panel on Climate Change A1B emission conditions. We focus on one of the world's strongest extra-tropical GW zones, the Andes Mountains at mid-latitudes in the Southern Hemisphere. The presence of two GCM sub-grid scale structures locally contributing to GWMF (one positive and one negative) is found to the East of the mountains. For the late 21st century the strength of these structures during the GW high season increases around 23% with respect to the late 20th century, but the GWMF average over GCM grid cell scales remains negative and nearly constant around -0.015 Pa. This constitutes a steady significant contribution during GW high season, which is not related to the GWMF released by individual sporadic strong GW events. This characteristic agrees with the fact that no statistically significant variation in GWMF at source level has been observed in recent GCM simulations of atmospheric change induced by increases in greenhouse gases. © 2011 COSPAR. Published by Elsevier Ltd. All rights reserved. Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ruscica, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sörensson, A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Menéndez, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v48_n8_p1359_Alexander http://hdl.handle.net/20.500.12110/paper_02731177_v48_n8_p1359_Alexander |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Gravity waves Momentum Numerical simulations 20th century Atmospheric changes Atmospheric model Critical component Down-scaling Dynamical process General circulation model Gravity wave momentum Grid cells Horizontal resolution Intergovernmental panel on climate changes Mesoscale simulation Midlatitudes Momentum flux Orographic gravity waves Parameterizations Seasonal patterns Source level Southern Hemisphere Subgrid scale Climate models Global warming Gravity waves Greenhouse gases Hydrodynamics Landforms Momentum Waves Computer simulation |
| spellingShingle |
Gravity waves Momentum Numerical simulations 20th century Atmospheric changes Atmospheric model Critical component Down-scaling Dynamical process General circulation model Gravity wave momentum Grid cells Horizontal resolution Intergovernmental panel on climate changes Mesoscale simulation Midlatitudes Momentum flux Orographic gravity waves Parameterizations Seasonal patterns Source level Southern Hemisphere Subgrid scale Climate models Global warming Gravity waves Greenhouse gases Hydrodynamics Landforms Momentum Waves Computer simulation Alexander, Pedro M. Ruscica, Romina Sorensson, Anna Amelia Menendez, Claudio Guillermo Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| topic_facet |
Gravity waves Momentum Numerical simulations 20th century Atmospheric changes Atmospheric model Critical component Down-scaling Dynamical process General circulation model Gravity wave momentum Grid cells Horizontal resolution Intergovernmental panel on climate changes Mesoscale simulation Midlatitudes Momentum flux Orographic gravity waves Parameterizations Seasonal patterns Source level Southern Hemisphere Subgrid scale Climate models Global warming Gravity waves Greenhouse gases Hydrodynamics Landforms Momentum Waves Computer simulation |
| description |
Adequate representations of diverse dynamical processes in general circulation models (GCM) are necessary to obtain reliable simulations of the present and the future. The parameterization of orographic gravity wave drag (GWD) is one of the critical components of GCM. It is therefore convenient to evaluate whether standard orographic GWD parameterizations are appropriate. One alternative is to study the generation of gravity waves (GW) with horizontal resolutions that are higher than those used in current GCM simulations. Here we assess the seasonal pattern of topographic GW momentum flux (GWMF) generation for the late 20th and 21st centuries in a downscaling using the Rossby Centre regional atmospheric model under the Intergovernmental Panel on Climate Change A1B emission conditions. We focus on one of the world's strongest extra-tropical GW zones, the Andes Mountains at mid-latitudes in the Southern Hemisphere. The presence of two GCM sub-grid scale structures locally contributing to GWMF (one positive and one negative) is found to the East of the mountains. For the late 21st century the strength of these structures during the GW high season increases around 23% with respect to the late 20th century, but the GWMF average over GCM grid cell scales remains negative and nearly constant around -0.015 Pa. This constitutes a steady significant contribution during GW high season, which is not related to the GWMF released by individual sporadic strong GW events. This characteristic agrees with the fact that no statistically significant variation in GWMF at source level has been observed in recent GCM simulations of atmospheric change induced by increases in greenhouse gases. © 2011 COSPAR. Published by Elsevier Ltd. All rights reserved. |
| author |
Alexander, Pedro M. Ruscica, Romina Sorensson, Anna Amelia Menendez, Claudio Guillermo |
| author_facet |
Alexander, Pedro M. Ruscica, Romina Sorensson, Anna Amelia Menendez, Claudio Guillermo |
| author_sort |
Alexander, Pedro M. |
| title |
Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| title_short |
Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| title_full |
Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| title_fullStr |
Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| title_full_unstemmed |
Gravity wave momentum flux generation close to mid-latitude Andes in mesoscale simulations of late 20th and 21st centuries |
| title_sort |
gravity wave momentum flux generation close to mid-latitude andes in mesoscale simulations of late 20th and 21st centuries |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v48_n8_p1359_Alexander http://hdl.handle.net/20.500.12110/paper_02731177_v48_n8_p1359_Alexander |
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AT alexanderpedrom gravitywavemomentumfluxgenerationclosetomidlatitudeandesinmesoscalesimulationsoflate20thand21stcenturies AT ruscicaromina gravitywavemomentumfluxgenerationclosetomidlatitudeandesinmesoscalesimulationsoflate20thand21stcenturies AT sorenssonannaamelia gravitywavemomentumfluxgenerationclosetomidlatitudeandesinmesoscalesimulationsoflate20thand21stcenturies AT menendezclaudioguillermo gravitywavemomentumfluxgenerationclosetomidlatitudeandesinmesoscalesimulationsoflate20thand21stcenturies |
| _version_ |
1768546299698741248 |