Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events
Abstract The tropical Mesosphere‐Lower Thermosphere‐Ionosphere system is found to show significant variabilities during Sudden Stratospheric Warming (SSW) events. Recent studies have highlighted the possible role played by modified background wind conditions in communicating the SSW‐induced stratosp...
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| Format: | Article |
| Language: | English |
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Wiley
2020-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL086857 |
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| author | N. Koushik Karanam Kishore Kumar Tarique A. Siddiqui |
| author_facet | N. Koushik Karanam Kishore Kumar Tarique A. Siddiqui |
| author_sort | N. Koushik |
| collection | DOAJ |
| description | Abstract The tropical Mesosphere‐Lower Thermosphere‐Ionosphere system is found to show significant variabilities during Sudden Stratospheric Warming (SSW) events. Recent studies have highlighted the possible role played by modified background wind conditions in communicating the SSW‐induced stratospheric perturbations to the Mesosphere‐Lower Thermosphere‐Ionosphere region. In the present study, changes in the background zonal winds at the tropical stratopause during major SSW events inferred from MERRA‐2 reanalysis data sets, rocket observations, and model simulations are reported for the first time. The tropical stratopause shows enhanced westward winds during the course of major SSW events. Rocketsonde observations from a low latitude station Thumba (8.5 ° N,76.9 ° E) also showed significant westward acceleration during three major SSW events. Further, Specified Dynamics version of the Whole Atmosphere Community Climate Model simulations for the 2008–2009 SSW replicate the observed features. |
| format | Article |
| id | doaj-art-7ce249fadc404ba4b9b7619d6074c385 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2020-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-7ce249fadc404ba4b9b7619d6074c3852025-08-20T01:50:15ZengWileyGeophysical Research Letters0094-82761944-80072020-02-01473n/an/a10.1029/2019GL086857Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming EventsN. Koushik0Karanam Kishore Kumar1Tarique A. Siddiqui2Space Physics Laboratory Vikram Sarabhai Space Centre Thiruvananthapuram IndiaSpace Physics Laboratory Vikram Sarabhai Space Centre Thiruvananthapuram IndiaGFZ German Research Centre for Geosciences Potsdam GermanyAbstract The tropical Mesosphere‐Lower Thermosphere‐Ionosphere system is found to show significant variabilities during Sudden Stratospheric Warming (SSW) events. Recent studies have highlighted the possible role played by modified background wind conditions in communicating the SSW‐induced stratospheric perturbations to the Mesosphere‐Lower Thermosphere‐Ionosphere region. In the present study, changes in the background zonal winds at the tropical stratopause during major SSW events inferred from MERRA‐2 reanalysis data sets, rocket observations, and model simulations are reported for the first time. The tropical stratopause shows enhanced westward winds during the course of major SSW events. Rocketsonde observations from a low latitude station Thumba (8.5 ° N,76.9 ° E) also showed significant westward acceleration during three major SSW events. Further, Specified Dynamics version of the Whole Atmosphere Community Climate Model simulations for the 2008–2009 SSW replicate the observed features.https://doi.org/10.1029/2019GL086857high latitude‐ low latitude couplingmiddle atmosphere dynamicsplanetary waves |
| spellingShingle | N. Koushik Karanam Kishore Kumar Tarique A. Siddiqui Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events Geophysical Research Letters high latitude‐ low latitude coupling middle atmosphere dynamics planetary waves |
| title | Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events |
| title_full | Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events |
| title_fullStr | Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events |
| title_full_unstemmed | Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events |
| title_short | Westward Acceleration of Tropical Stratopause Zonal Winds During Major Sudden Stratospheric Warming Events |
| title_sort | westward acceleration of tropical stratopause zonal winds during major sudden stratospheric warming events |
| topic | high latitude‐ low latitude coupling middle atmosphere dynamics planetary waves |
| url | https://doi.org/10.1029/2019GL086857 |
| work_keys_str_mv | AT nkoushik westwardaccelerationoftropicalstratopausezonalwindsduringmajorsuddenstratosphericwarmingevents AT karanamkishorekumar westwardaccelerationoftropicalstratopausezonalwindsduringmajorsuddenstratosphericwarmingevents AT tariqueasiddiqui westwardaccelerationoftropicalstratopausezonalwindsduringmajorsuddenstratosphericwarmingevents |