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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ftopenaccessrep:oai:zenodo.org:59956 2023-05-15T13:47:41+02:00 Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer Daniela Cava Umberto Giostra Gabriel Katul 2015-08-25 https://www.openaccessrepository.it/record/59956 https://doi.org/10.3390/atmos6091271 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/59956 doi:10.3390/atmos6091271 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ CC-BY info:eu-repo/semantics/article publication-article 2015 ftopenaccessrep https://doi.org/10.3390/atmos6091271 2022-11-23T06:47:14Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Antarctic Austral Atmosphere 6 9 1271 1289 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
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 |
Article in Journal/Newspaper |
author |
Daniela Cava Umberto Giostra Gabriel Katul |
spellingShingle |
Daniela Cava Umberto Giostra Gabriel Katul Characteristics of Gravity Waves over an Antarctic Ice Sheet during an Austral Summer |
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 |
publishDate |
2015 |
url |
https://www.openaccessrepository.it/record/59956 https://doi.org/10.3390/atmos6091271 |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/59956 doi:10.3390/atmos6091271 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
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 |
_version_ |
1766247674957266944 |