A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere
Abstract The Quasi‐Biennial Oscillation and the Semiannual Oscillation have been identified to be the leading modes of variability in the tropical middle atmosphere. With reanalysis data and independent rocket soundings from a low latitude site, we report the existence of yet another variability in...
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ftdoajarticles:oai:doaj.org/article:1cbb85099dbc4cd793b1d72bd04c4123 2024-09-15T17:48:47+00:00 A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere N. Koushik K. Kishore Kumar 2024-08-01T00:00:00Z https://doi.org/10.1029/2024GL110419 https://doaj.org/article/1cbb85099dbc4cd793b1d72bd04c4123 EN eng Wiley https://doi.org/10.1029/2024GL110419 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL110419 https://doaj.org/article/1cbb85099dbc4cd793b1d72bd04c4123 Geophysical Research Letters, Vol 51, Iss 15, Pp n/a-n/a (2024) semiannual oscillation quasi biennial oscillation variability eliassen‐palm flux Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL110419 2024-08-19T14:56:40Z Abstract The Quasi‐Biennial Oscillation and the Semiannual Oscillation have been identified to be the leading modes of variability in the tropical middle atmosphere. With reanalysis data and independent rocket soundings from a low latitude site, we report the existence of yet another variability in the tropical lower mesosphere which is primarily evident as easterly bursts in zonal winds during the months of May‐July. It occurs with a variable interval of 2–5 yrs in the late 20th century and 7–9 yrs in the early 21st century. These Quasi‐Periodic Easterly Bursts are found to have remote influences on the Antarctic polar vortex as well as residual circulation in the lower mesosphere. We identify a potential causative mechanism for the easterly bursts that involve enhanced cross equatorial advection of momentum as well as gravity wave drag. A close association with Quasi Biennial Oscillation winds is observed, however, cause of the observed periodicity remains elusive. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 15 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
semiannual oscillation quasi biennial oscillation variability eliassen‐palm flux Geophysics. Cosmic physics QC801-809 |
spellingShingle |
semiannual oscillation quasi biennial oscillation variability eliassen‐palm flux Geophysics. Cosmic physics QC801-809 N. Koushik K. Kishore Kumar A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
topic_facet |
semiannual oscillation quasi biennial oscillation variability eliassen‐palm flux Geophysics. Cosmic physics QC801-809 |
description |
Abstract The Quasi‐Biennial Oscillation and the Semiannual Oscillation have been identified to be the leading modes of variability in the tropical middle atmosphere. With reanalysis data and independent rocket soundings from a low latitude site, we report the existence of yet another variability in the tropical lower mesosphere which is primarily evident as easterly bursts in zonal winds during the months of May‐July. It occurs with a variable interval of 2–5 yrs in the late 20th century and 7–9 yrs in the early 21st century. These Quasi‐Periodic Easterly Bursts are found to have remote influences on the Antarctic polar vortex as well as residual circulation in the lower mesosphere. We identify a potential causative mechanism for the easterly bursts that involve enhanced cross equatorial advection of momentum as well as gravity wave drag. A close association with Quasi Biennial Oscillation winds is observed, however, cause of the observed periodicity remains elusive. |
format |
Article in Journal/Newspaper |
author |
N. Koushik K. Kishore Kumar |
author_facet |
N. Koushik K. Kishore Kumar |
author_sort |
N. Koushik |
title |
A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
title_short |
A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
title_full |
A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
title_fullStr |
A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
title_full_unstemmed |
A Puzzling Quasi‐Periodic Variability in the Tropical Middle Atmosphere |
title_sort |
puzzling quasi‐periodic variability in the tropical middle atmosphere |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL110419 https://doaj.org/article/1cbb85099dbc4cd793b1d72bd04c4123 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Geophysical Research Letters, Vol 51, Iss 15, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL110419 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL110419 https://doaj.org/article/1cbb85099dbc4cd793b1d72bd04c4123 |
op_doi |
https://doi.org/10.1029/2024GL110419 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
15 |
_version_ |
1810290305153368064 |