Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming
Sudden stratospheric warmings (SSWs) could act as an important mediator in the vertical coupling of atmospheric regions and dramatic variations in the mesosphere and lower thermosphere (MLT) in response to SSWs have been documented. However, due to rare occurrences, SSWs in the Southern Hemisphere (...
Published in: | Journal of Geophysical Research: Space Physics |
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Main Authors: | , , , , , , |
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2021
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Online Access: | https://researchportal.bath.ac.uk/en/publications/6516eec9-25be-4eec-bcd9-116e55d75b2e https://doi.org/10.1029/2020JA028909 http://www.scopus.com/inward/record.url?scp=85107040536&partnerID=8YFLogxK |
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ftunivbathcris:oai:purehost.bath.ac.uk:publications/6516eec9-25be-4eec-bcd9-116e55d75b2e 2024-04-28T07:57:43+00:00 Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming Liu, Guiping Janches, Diego Lieberman, Ruth S. Moffat-Griffin, Tracy Mitchell, Nicholas J. Kim, Jeong Han Lee, Changsup 2021-05-31 https://researchportal.bath.ac.uk/en/publications/6516eec9-25be-4eec-bcd9-116e55d75b2e https://doi.org/10.1029/2020JA028909 http://www.scopus.com/inward/record.url?scp=85107040536&partnerID=8YFLogxK eng eng https://researchportal.bath.ac.uk/en/publications/6516eec9-25be-4eec-bcd9-116e55d75b2e info:eu-repo/semantics/closedAccess Liu , G , Janches , D , Lieberman , R S , Moffat-Griffin , T , Mitchell , N J , Kim , J H & Lee , C 2021 , ' Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming ' , Journal of Geophysical Research: Space Physics , vol. 126 , no. 5 , e2020JA028909 . https://doi.org/10.1029/2020JA028909 mesosphere and lower thermosphere mesospheric wind planetary wave planetary wave-tide interaction tides upper atmosphere /dk/atira/pure/subjectarea/asjc/1900/1912 name=Space and Planetary Science /dk/atira/pure/subjectarea/asjc/1900/1908 name=Geophysics article 2021 ftunivbathcris https://doi.org/10.1029/2020JA028909 2024-04-09T02:47:37Z Sudden stratospheric warmings (SSWs) could act as an important mediator in the vertical coupling of atmospheric regions and dramatic variations in the mesosphere and lower thermosphere (MLT) in response to SSWs have been documented. However, due to rare occurrences, SSWs in the Southern Hemisphere (SH) and their impacts on the MLT dynamics are not well understood. This study presents an analysis of MLT winds at ∼80–98 km altitudes measured by meteor radars located at Tierra del Fuego (53.7°S, 67.7°W), King Edward Point (54.3°S, 36.5°W) and King Sejong Station (62.2°S, 58.8°W) near 60°S latitude during the Antarctic winter. Eastward zonal winds from these stations are observed to decrease significantly near the peak date of the 2019 Antarctic SSW, and both zonal and meridional winds in 2019 exhibit considerable differences to the mean winds averaged over other non-SSW years. A quasi 6-day oscillation is observed at all three radar locations, being consistent with the presence of the westward propagating zonal wave-1 planetary wave. The vertical wavelength of this wave is estimated to be ∼55 km, and the enhancement of the wave amplitude during this SSW is noticeable. Evidence of the interaction between the 6-day wave and the semidiurnal diurnal tide is provided, which suggests a possible mechanism for SSWs to impact the upper atmosphere. This study reports the large-scale variations in winds in the MLT region at SH midlatitudes to high latitudes in a key dynamic but largely unexplored latitudinal band in response to the 2019 Antarctic SSW. Article in Journal/Newspaper Antarc* Antarctic Tierra del Fuego University of Bath's research portal Journal of Geophysical Research: Space Physics 126 5 |
institution |
Open Polar |
collection |
University of Bath's research portal |
op_collection_id |
ftunivbathcris |
language |
English |
topic |
mesosphere and lower thermosphere mesospheric wind planetary wave planetary wave-tide interaction tides upper atmosphere /dk/atira/pure/subjectarea/asjc/1900/1912 name=Space and Planetary Science /dk/atira/pure/subjectarea/asjc/1900/1908 name=Geophysics |
spellingShingle |
mesosphere and lower thermosphere mesospheric wind planetary wave planetary wave-tide interaction tides upper atmosphere /dk/atira/pure/subjectarea/asjc/1900/1912 name=Space and Planetary Science /dk/atira/pure/subjectarea/asjc/1900/1908 name=Geophysics Liu, Guiping Janches, Diego Lieberman, Ruth S. Moffat-Griffin, Tracy Mitchell, Nicholas J. Kim, Jeong Han Lee, Changsup Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
topic_facet |
mesosphere and lower thermosphere mesospheric wind planetary wave planetary wave-tide interaction tides upper atmosphere /dk/atira/pure/subjectarea/asjc/1900/1912 name=Space and Planetary Science /dk/atira/pure/subjectarea/asjc/1900/1908 name=Geophysics |
description |
Sudden stratospheric warmings (SSWs) could act as an important mediator in the vertical coupling of atmospheric regions and dramatic variations in the mesosphere and lower thermosphere (MLT) in response to SSWs have been documented. However, due to rare occurrences, SSWs in the Southern Hemisphere (SH) and their impacts on the MLT dynamics are not well understood. This study presents an analysis of MLT winds at ∼80–98 km altitudes measured by meteor radars located at Tierra del Fuego (53.7°S, 67.7°W), King Edward Point (54.3°S, 36.5°W) and King Sejong Station (62.2°S, 58.8°W) near 60°S latitude during the Antarctic winter. Eastward zonal winds from these stations are observed to decrease significantly near the peak date of the 2019 Antarctic SSW, and both zonal and meridional winds in 2019 exhibit considerable differences to the mean winds averaged over other non-SSW years. A quasi 6-day oscillation is observed at all three radar locations, being consistent with the presence of the westward propagating zonal wave-1 planetary wave. The vertical wavelength of this wave is estimated to be ∼55 km, and the enhancement of the wave amplitude during this SSW is noticeable. Evidence of the interaction between the 6-day wave and the semidiurnal diurnal tide is provided, which suggests a possible mechanism for SSWs to impact the upper atmosphere. This study reports the large-scale variations in winds in the MLT region at SH midlatitudes to high latitudes in a key dynamic but largely unexplored latitudinal band in response to the 2019 Antarctic SSW. |
format |
Article in Journal/Newspaper |
author |
Liu, Guiping Janches, Diego Lieberman, Ruth S. Moffat-Griffin, Tracy Mitchell, Nicholas J. Kim, Jeong Han Lee, Changsup |
author_facet |
Liu, Guiping Janches, Diego Lieberman, Ruth S. Moffat-Griffin, Tracy Mitchell, Nicholas J. Kim, Jeong Han Lee, Changsup |
author_sort |
Liu, Guiping |
title |
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
title_short |
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
title_full |
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
title_fullStr |
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
title_full_unstemmed |
Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming |
title_sort |
wind variations in the mesosphere and lower thermosphere near 60°s latitude during the 2019 antarctic sudden stratospheric warming |
publishDate |
2021 |
url |
https://researchportal.bath.ac.uk/en/publications/6516eec9-25be-4eec-bcd9-116e55d75b2e https://doi.org/10.1029/2020JA028909 http://www.scopus.com/inward/record.url?scp=85107040536&partnerID=8YFLogxK |
genre |
Antarc* Antarctic Tierra del Fuego |
genre_facet |
Antarc* Antarctic Tierra del Fuego |
op_source |
Liu , G , Janches , D , Lieberman , R S , Moffat-Griffin , T , Mitchell , N J , Kim , J H & Lee , C 2021 , ' Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming ' , Journal of Geophysical Research: Space Physics , vol. 126 , no. 5 , e2020JA028909 . https://doi.org/10.1029/2020JA028909 |
op_relation |
https://researchportal.bath.ac.uk/en/publications/6516eec9-25be-4eec-bcd9-116e55d75b2e |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2020JA028909 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
126 |
container_issue |
5 |
_version_ |
1797589911427088384 |