Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019
A minor Antarctic sudden stratospheric warming (SSW) with the strongest circulation changes since the first major SSW over the Antarctic was recorded in 2002 occurred in early September 2019. The diagnosis demonstrates two possible causes of this SSW. First, the tropical central Pacific warming is i...
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ftmdpi:oai:mdpi.com:/2073-4433/13/1/147/ 2023-08-20T04:02:19+02:00 Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 Chenming Ma Pengkun Yang Xin Tan Ming Bao agris 2022-01-17 application/pdf https://doi.org/10.3390/atmos13010147 EN eng Multidisciplinary Digital Publishing Institute Climatology https://dx.doi.org/10.3390/atmos13010147 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 13; Issue 1; Pages: 147 Antarctic SSW central Pacific warming anomalous deep convection planetary wave stratospheric state Text 2022 ftmdpi https://doi.org/10.3390/atmos13010147 2023-08-01T03:51:59Z A minor Antarctic sudden stratospheric warming (SSW) with the strongest circulation changes since the first major SSW over the Antarctic was recorded in 2002 occurred in early September 2019. The diagnosis demonstrates two possible causes of this SSW. First, the tropical central Pacific warming is identified, which enhanced the amplitude of tropospheric planetary wavenumber 1 (W1) in the extratropics on the seasonal time scale. Second, the impact of intraseasonal convection anomalies similar to previous studies is also suggested here. The enhanced deep convection over the South Pacific Convergence Zone (SPCZ) in late August–early September excited a Rossby wave train to deepen an anomalous ridge, which significantly and persistently strengthened the tropospheric W1. The central Pacific warming and intraseasonal convection anomalies jointly provided the conditions for the occurrence of the Antarctic SSW in 2019 on different time scales. On the other hand, the difference of the stratospheric state between the Antarctic SSWs in 2019 and 2002 may be an important reason why the 2019 event did not meet the major SSW criteria. The stratospheric state before the 2019 SSW event is somewhat not as ideal as that of the 2002 event. Vertical planetary waves are, hence, more difficult to enter into the polar stratosphere, making it more difficult to trigger major events. Text Antarc* Antarctic MDPI Open Access Publishing Antarctic The Antarctic Pacific Atmosphere 13 1 147 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Antarctic SSW central Pacific warming anomalous deep convection planetary wave stratospheric state |
spellingShingle |
Antarctic SSW central Pacific warming anomalous deep convection planetary wave stratospheric state Chenming Ma Pengkun Yang Xin Tan Ming Bao Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
topic_facet |
Antarctic SSW central Pacific warming anomalous deep convection planetary wave stratospheric state |
description |
A minor Antarctic sudden stratospheric warming (SSW) with the strongest circulation changes since the first major SSW over the Antarctic was recorded in 2002 occurred in early September 2019. The diagnosis demonstrates two possible causes of this SSW. First, the tropical central Pacific warming is identified, which enhanced the amplitude of tropospheric planetary wavenumber 1 (W1) in the extratropics on the seasonal time scale. Second, the impact of intraseasonal convection anomalies similar to previous studies is also suggested here. The enhanced deep convection over the South Pacific Convergence Zone (SPCZ) in late August–early September excited a Rossby wave train to deepen an anomalous ridge, which significantly and persistently strengthened the tropospheric W1. The central Pacific warming and intraseasonal convection anomalies jointly provided the conditions for the occurrence of the Antarctic SSW in 2019 on different time scales. On the other hand, the difference of the stratospheric state between the Antarctic SSWs in 2019 and 2002 may be an important reason why the 2019 event did not meet the major SSW criteria. The stratospheric state before the 2019 SSW event is somewhat not as ideal as that of the 2002 event. Vertical planetary waves are, hence, more difficult to enter into the polar stratosphere, making it more difficult to trigger major events. |
format |
Text |
author |
Chenming Ma Pengkun Yang Xin Tan Ming Bao |
author_facet |
Chenming Ma Pengkun Yang Xin Tan Ming Bao |
author_sort |
Chenming Ma |
title |
Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
title_short |
Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
title_full |
Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
title_fullStr |
Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
title_full_unstemmed |
Possible Causes of the Occurrence of a Rare Antarctic Sudden Stratospheric Warming in 2019 |
title_sort |
possible causes of the occurrence of a rare antarctic sudden stratospheric warming in 2019 |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/atmos13010147 |
op_coverage |
agris |
geographic |
Antarctic The Antarctic Pacific |
geographic_facet |
Antarctic The Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Atmosphere; Volume 13; Issue 1; Pages: 147 |
op_relation |
Climatology https://dx.doi.org/10.3390/atmos13010147 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos13010147 |
container_title |
Atmosphere |
container_volume |
13 |
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1 |
container_start_page |
147 |
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1774712720862478336 |