The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter
We found a statistically significant relationship between the stratospheric quasi-biennial oscillation (QBO) and Antarctic sea ice concentration (SIC) in austral winter. SIC differences between the easterly phase of the QBO (EQBO) and westerly phase of the QBO (WQBO) show positive anomalies of SIC i...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/82706 2023-05-15T13:51:33+02:00 The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter Yamazaki, Koji Nakamura, Tetsu http://hdl.handle.net/2115/82706 https://doi.org/10.1016/j.polar.2021.100674 eng eng Elsevier http://hdl.handle.net/2115/82706 Polar Science, 28: 100674 http://dx.doi.org/10.1016/j.polar.2021.100674 Antarctic sea ice QBO Rossby wave train Tropical convection Stratosphere 452 article fthokunivhus https://doi.org/10.1016/j.polar.2021.100674 2022-11-18T01:06:36Z We found a statistically significant relationship between the stratospheric quasi-biennial oscillation (QBO) and Antarctic sea ice concentration (SIC) in austral winter. SIC differences between the easterly phase of the QBO (EQBO) and westerly phase of the QBO (WQBO) show positive anomalies of SIC in the following regions: over the Ross Sea, Weddell Sea, and around 90 degrees E. This wave-3 pattern is clearly seen in June and July, and decays in August. The increased SIC regions correspond to anomalous offshore wind regions, and the reduced SIC regions correspond to onshore wind regions, indicating the atmospheric circulation anomaly produced the SIC anomaly. The atmospheric circulation anomaly is barotropic and closely related with the upper atmospheric flow. The upper circulation anomaly shows a stationary Rossby wave train propagating from Indian Ocean. We show the enhanced convection in the tropical Indian Ocean in EQBO can excite the Rossby wave train. In summary, the stratospheric QBO affects the tropical convection, then generating the Rossby wave train which propagates into southern high latitude, and finally affecting Antarctic sea ice. There exists a possibility to predict winter sea ice in one-year advance, because the QBO is a quasi-regular oscillation. Article in Journal/Newspaper Antarc* Antarctic Polar Science Polar Science Ross Sea Sea ice Weddell Sea Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Austral Indian Ross Sea Weddell Weddell Sea Polar Science 28 100674 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctic sea ice QBO Rossby wave train Tropical convection Stratosphere 452 |
spellingShingle |
Antarctic sea ice QBO Rossby wave train Tropical convection Stratosphere 452 Yamazaki, Koji Nakamura, Tetsu The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
topic_facet |
Antarctic sea ice QBO Rossby wave train Tropical convection Stratosphere 452 |
description |
We found a statistically significant relationship between the stratospheric quasi-biennial oscillation (QBO) and Antarctic sea ice concentration (SIC) in austral winter. SIC differences between the easterly phase of the QBO (EQBO) and westerly phase of the QBO (WQBO) show positive anomalies of SIC in the following regions: over the Ross Sea, Weddell Sea, and around 90 degrees E. This wave-3 pattern is clearly seen in June and July, and decays in August. The increased SIC regions correspond to anomalous offshore wind regions, and the reduced SIC regions correspond to onshore wind regions, indicating the atmospheric circulation anomaly produced the SIC anomaly. The atmospheric circulation anomaly is barotropic and closely related with the upper atmospheric flow. The upper circulation anomaly shows a stationary Rossby wave train propagating from Indian Ocean. We show the enhanced convection in the tropical Indian Ocean in EQBO can excite the Rossby wave train. In summary, the stratospheric QBO affects the tropical convection, then generating the Rossby wave train which propagates into southern high latitude, and finally affecting Antarctic sea ice. There exists a possibility to predict winter sea ice in one-year advance, because the QBO is a quasi-regular oscillation. |
format |
Article in Journal/Newspaper |
author |
Yamazaki, Koji Nakamura, Tetsu |
author_facet |
Yamazaki, Koji Nakamura, Tetsu |
author_sort |
Yamazaki, Koji |
title |
The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
title_short |
The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
title_full |
The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
title_fullStr |
The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
title_full_unstemmed |
The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter |
title_sort |
stratospheric qbo affects antarctic sea ice through the tropical convection in early austral winter |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/82706 https://doi.org/10.1016/j.polar.2021.100674 |
geographic |
Antarctic Austral Indian Ross Sea Weddell Weddell Sea |
geographic_facet |
Antarctic Austral Indian Ross Sea Weddell Weddell Sea |
genre |
Antarc* Antarctic Polar Science Polar Science Ross Sea Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Polar Science Polar Science Ross Sea Sea ice Weddell Sea |
op_relation |
http://hdl.handle.net/2115/82706 Polar Science, 28: 100674 http://dx.doi.org/10.1016/j.polar.2021.100674 |
op_doi |
https://doi.org/10.1016/j.polar.2021.100674 |
container_title |
Polar Science |
container_volume |
28 |
container_start_page |
100674 |
_version_ |
1766255459073785856 |