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The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter

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Title: The stratospheric QBO affects antarctic sea ice through the tropical convection in early austral winter
Authors: Yamazaki, Koji Browse this author
Nakamura, Tetsu Browse this author
Keywords: Antarctic sea ice
Rossby wave train
Tropical convection
Issue Date: Jun-2021
Publisher: Elsevier
Journal Title: Polar Science
Volume: 28
Start Page: 100674
Publisher DOI: 10.1016/j.polar.2021.100674
Abstract: 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.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山崎 孝治

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