Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling?
Favored occurrences of Equatorial Counter Electrojets (CEJs) with a quasi 16-day periodicity over Trivandrum (8.5° N, 76.5° E, 0.5° N diplat.) in association with the polar Stratospheric Sudden Warming (SSW) events are presented. It is observed that, the stratospheric temp...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/3147/2009/angeo-27-3147-2009.pdf |
| _version_ | 1818235117537067008 |
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| author | C. Vineeth T. Kumar Pant R. Sridharan |
| author_facet | C. Vineeth T. Kumar Pant R. Sridharan |
| author_sort | C. Vineeth |
| collection | DOAJ |
| description | Favored occurrences of Equatorial Counter Electrojets (CEJs) with a quasi
16-day periodicity over Trivandrum (8.5° N, 76.5° E, 0.5° N
diplat.) in association with the polar Stratospheric Sudden Warming (SSW)
events are presented. It is observed that, the stratospheric temperature at
~30 km over Trivandrum shows a sudden cooling prior to the SSWs and
the CEJs of maximum intensity which occurs around this time. In general
stronger CEJs are associated with more intense SSW events. The stratospheric
zonal mean zonal wind over Trivandrum also exhibits a distinctly different
pattern during the SSW period. These circulation changes are proposed to be
conducive for the upward propagation of the lower atmospheric waves over the
equatorial latitudes. The interaction of such waves with the tidal
components at the upper mesosphere and its subsequent modification are
suggested to be responsible for the occurrence of CEJs having planetary wave
periods. |
| first_indexed | 2024-12-12T11:48:52Z |
| format | Article |
| id | doaj.art-58a0f6e2bd5f4e0ba00ef109637c9243 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-12T11:48:52Z |
| publishDate | 2009-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-58a0f6e2bd5f4e0ba00ef109637c92432022-12-22T00:25:23ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762009-08-01273147315310.5194/angeo-27-3147-2009Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling?C. Vineeth0T. Kumar Pant1R. Sridharan2SRI International, Menlo Park, CA, USASpace Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, IndiaFavored occurrences of Equatorial Counter Electrojets (CEJs) with a quasi 16-day periodicity over Trivandrum (8.5° N, 76.5° E, 0.5° N diplat.) in association with the polar Stratospheric Sudden Warming (SSW) events are presented. It is observed that, the stratospheric temperature at ~30 km over Trivandrum shows a sudden cooling prior to the SSWs and the CEJs of maximum intensity which occurs around this time. In general stronger CEJs are associated with more intense SSW events. The stratospheric zonal mean zonal wind over Trivandrum also exhibits a distinctly different pattern during the SSW period. These circulation changes are proposed to be conducive for the upward propagation of the lower atmospheric waves over the equatorial latitudes. The interaction of such waves with the tidal components at the upper mesosphere and its subsequent modification are suggested to be responsible for the occurrence of CEJs having planetary wave periods.https://www.ann-geophys.net/27/3147/2009/angeo-27-3147-2009.pdf |
| spellingShingle | C. Vineeth T. Kumar Pant R. Sridharan Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? Annales Geophysicae |
| title | Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? |
| title_full | Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? |
| title_fullStr | Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? |
| title_full_unstemmed | Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? |
| title_short | Equatorial counter electrojets and polar stratospheric sudden warmings – a classical example of high latitude-low latitude coupling? |
| title_sort | equatorial counter electrojets and polar stratospheric sudden warmings ndash a classical example of high latitude low latitude coupling |
| url | https://www.ann-geophys.net/27/3147/2009/angeo-27-3147-2009.pdf |
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