Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic
Inertia-gravity waves (IGWs) are an important component for the dynamics of the middle atmosphere. However, observational studies needed to constrain their forcing are still insufficient especially in the remote areas of the Antarctic region. One year of observational data (January to December 2013)...
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ftdoajarticles:oai:doaj.org/article:0203a365ea164199878f62de4803c35f 2023-05-15T13:34:31+02:00 Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic M. Mihalikova K. Sato M. Tsutsumi T. Sato 2016-05-01T00:00:00Z https://doi.org/10.5194/angeo-34-543-2016 https://doaj.org/article/0203a365ea164199878f62de4803c35f EN eng Copernicus Publications https://www.ann-geophys.net/34/543/2016/angeo-34-543-2016.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-34-543-2016 0992-7689 1432-0576 https://doaj.org/article/0203a365ea164199878f62de4803c35f Annales Geophysicae, Vol 34, Pp 543-555 (2016) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2016 ftdoajarticles https://doi.org/10.5194/angeo-34-543-2016 2022-12-31T05:34:53Z Inertia-gravity waves (IGWs) are an important component for the dynamics of the middle atmosphere. However, observational studies needed to constrain their forcing are still insufficient especially in the remote areas of the Antarctic region. One year of observational data (January to December 2013) by the PANSY radar of the wind components (vertical resolution of 150 m and temporal resolution of 30 min) are used to derive statistical analysis of the properties of IGWs with short vertical wavelengths ( ≤ 4 km) and ground-based periods longer than 4 h in the lowermost stratosphere (height range 10 to 12 km) with the help of the hodograph method. The annual change of the IGWs parameters are inspected but no pronounced year cycle is found. The year is divided into two seasons (summer and winter) based on the most prominent difference in the ratio of Coriolis parameter ( f ) to intrinsic frequency ( ω ^ ) distribution. Average of f ∕ ω ^ for the winter season is 0.40 and for the summer season 0.45 and the average horizontal wavelengths are 140 and 160 km respectively. Vertical wavelengths have an average of 1.85 km through the year. For both seasons the properties of IGWs with upward and downward propagation of the energy are also derived and compared. The percentage of downward propagating waves is 10.7 and 18.4 % in the summer and winter season respectively. This seasonal change is more than the one previously reported in the studies from mid-latitudes and model-based studies. It is in agreement with the findings of past radiosonde data-based studies from the Antarctic region. In addition, using the so-called dual-beam technique, vertical momentum flux and the variance of the horizontal perturbation velocities of IGWs are examined. Tropospheric disturbances of synoptic-scale are suggested as a source of episodes of IGWs with large variance of horizontal perturbation velocities, and this is shown in a number of cases. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Syowa Station Annales Geophysicae 34 5 543 555 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 M. Mihalikova K. Sato M. Tsutsumi T. Sato Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Inertia-gravity waves (IGWs) are an important component for the dynamics of the middle atmosphere. However, observational studies needed to constrain their forcing are still insufficient especially in the remote areas of the Antarctic region. One year of observational data (January to December 2013) by the PANSY radar of the wind components (vertical resolution of 150 m and temporal resolution of 30 min) are used to derive statistical analysis of the properties of IGWs with short vertical wavelengths ( ≤ 4 km) and ground-based periods longer than 4 h in the lowermost stratosphere (height range 10 to 12 km) with the help of the hodograph method. The annual change of the IGWs parameters are inspected but no pronounced year cycle is found. The year is divided into two seasons (summer and winter) based on the most prominent difference in the ratio of Coriolis parameter ( f ) to intrinsic frequency ( ω ^ ) distribution. Average of f ∕ ω ^ for the winter season is 0.40 and for the summer season 0.45 and the average horizontal wavelengths are 140 and 160 km respectively. Vertical wavelengths have an average of 1.85 km through the year. For both seasons the properties of IGWs with upward and downward propagation of the energy are also derived and compared. The percentage of downward propagating waves is 10.7 and 18.4 % in the summer and winter season respectively. This seasonal change is more than the one previously reported in the studies from mid-latitudes and model-based studies. It is in agreement with the findings of past radiosonde data-based studies from the Antarctic region. In addition, using the so-called dual-beam technique, vertical momentum flux and the variance of the horizontal perturbation velocities of IGWs are examined. Tropospheric disturbances of synoptic-scale are suggested as a source of episodes of IGWs with large variance of horizontal perturbation velocities, and this is shown in a number of cases. |
format |
Article in Journal/Newspaper |
author |
M. Mihalikova K. Sato M. Tsutsumi T. Sato |
author_facet |
M. Mihalikova K. Sato M. Tsutsumi T. Sato |
author_sort |
M. Mihalikova |
title |
Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
title_short |
Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
title_full |
Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
title_fullStr |
Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
title_full_unstemmed |
Properties of inertia-gravity waves in the lowermost stratosphere as observed by the PANSY radar over Syowa Station in the Antarctic |
title_sort |
properties of inertia-gravity waves in the lowermost stratosphere as observed by the pansy radar over syowa station in the antarctic |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/angeo-34-543-2016 https://doaj.org/article/0203a365ea164199878f62de4803c35f |
geographic |
Antarctic The Antarctic Syowa Station |
geographic_facet |
Antarctic The Antarctic Syowa Station |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Annales Geophysicae, Vol 34, Pp 543-555 (2016) |
op_relation |
https://www.ann-geophys.net/34/543/2016/angeo-34-543-2016.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-34-543-2016 0992-7689 1432-0576 https://doaj.org/article/0203a365ea164199878f62de4803c35f |
op_doi |
https://doi.org/10.5194/angeo-34-543-2016 |
container_title |
Annales Geophysicae |
container_volume |
34 |
container_issue |
5 |
container_start_page |
543 |
op_container_end_page |
555 |
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1766053871085420544 |