Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer
While occurrences of wavelike motion in the stable boundary layer due to the presence of a significant restoring buoyancy force are rarely disputed, their modalities and interaction with turbulence remain a subject of active research. In this work, the characteristics of gravity waves and their impa...
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ftmdpi:oai:mdpi.com:/2073-4433/6/9/1271/ 2023-08-20T04:01:22+02:00 Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer Daniela Cava Umberto Giostra Gabriel Katul agris 2015-08-25 application/pdf https://doi.org/10.3390/atmos6091271 EN eng Multidisciplinary Digital Publishing Institute Biosphere/Hydrosphere/Land–Atmosphere Interactions https://dx.doi.org/10.3390/atmos6091271 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 6; Issue 9; Pages: 1271-1289 Antarctica gravity waves multiresolution decomposition stable boundary layer turbulent fluxes Text 2015 ftmdpi https://doi.org/10.3390/atmos6091271 2023-07-31T20:46:01Z While occurrences of wavelike motion in the stable boundary layer due to the presence of a significant restoring buoyancy force are rarely disputed, their modalities and interaction with turbulence remain a subject of active research. In this work, the characteristics of gravity waves and their impact on flow statistics, including turbulent fluxes, are presented using data collected above an Antarctic Ice sheet during an Austral Summer. Antarctica is an ideal location for exploring the characteristics of gravity waves because of persistent conditions of strong atmospheric stability in the lower troposphere. Periods dominated by wavelike motion have been identified by analysing time series measured by fast response instrumentation. The nature and characteristic of the dominant wavy motions are investigated using Fourier cross-spectral indicators. Moreover, a multi-resolution decomposition has been applied to separate gravity waves from turbulent fluctuations in case of a sufficiently defined spectral gap. Statistics computed after removing wavy disturbances highlight the large impact of gravity waves on second order turbulent quantities including turbulent flux calculations. Text Antarc* Antarctic Antarctica Ice Sheet MDPI Open Access Publishing Antarctic Austral Atmosphere 6 9 1271 1289 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Antarctica gravity waves multiresolution decomposition stable boundary layer turbulent fluxes |
spellingShingle |
Antarctica gravity waves multiresolution decomposition stable boundary layer turbulent fluxes Daniela Cava Umberto Giostra Gabriel Katul Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
topic_facet |
Antarctica gravity waves multiresolution decomposition stable boundary layer turbulent fluxes |
description |
While occurrences of wavelike motion in the stable boundary layer due to the presence of a significant restoring buoyancy force are rarely disputed, their modalities and interaction with turbulence remain a subject of active research. In this work, the characteristics of gravity waves and their impact on flow statistics, including turbulent fluxes, are presented using data collected above an Antarctic Ice sheet during an Austral Summer. Antarctica is an ideal location for exploring the characteristics of gravity waves because of persistent conditions of strong atmospheric stability in the lower troposphere. Periods dominated by wavelike motion have been identified by analysing time series measured by fast response instrumentation. The nature and characteristic of the dominant wavy motions are investigated using Fourier cross-spectral indicators. Moreover, a multi-resolution decomposition has been applied to separate gravity waves from turbulent fluctuations in case of a sufficiently defined spectral gap. Statistics computed after removing wavy disturbances highlight the large impact of gravity waves on second order turbulent quantities including turbulent flux calculations. |
format |
Text |
author |
Daniela Cava Umberto Giostra Gabriel Katul |
author_facet |
Daniela Cava Umberto Giostra Gabriel Katul |
author_sort |
Daniela Cava |
title |
Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
title_short |
Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
title_full |
Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
title_fullStr |
Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
title_full_unstemmed |
Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
title_sort |
characteristics of gravity waves over an antarctic ice sheet during an austral summer |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2015 |
url |
https://doi.org/10.3390/atmos6091271 |
op_coverage |
agris |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Atmosphere; Volume 6; Issue 9; Pages: 1271-1289 |
op_relation |
Biosphere/Hydrosphere/Land–Atmosphere Interactions https://dx.doi.org/10.3390/atmos6091271 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos6091271 |
container_title |
Atmosphere |
container_volume |
6 |
container_issue |
9 |
container_start_page |
1271 |
op_container_end_page |
1289 |
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1774724661267922944 |