Weak Stratospheric Polar Vortex Events Modulated by the Arctic Sea-Ice Loss

Kazuhira Hoshi, Jinro Ukita, Meiji Honda, Tetsu Nakamura, Koji Yamazaki, Yasunobu Miyoshi, Ralf Jaiser

研究成果: Contribution to journalArticle査読

11 被引用数 (Scopus)

抄録

We characterize the differences in the upward planetary-scale wave propagation during observed weak polar vortex (WPV) events between heavy- and light-sea-ice years in the Barents-Kara Sea based on a composite analysis for the period of 1979–2015. Upward wave propagation during WPV events in heavy-ice years is dominated by the wavenumber 1 component. In contrast, WPV events occurring in light-ice years are characterized by stronger wavenumber 2 propagation, which is caused by the tropospheric wavenumber 2 response to sea-ice reduction in the Barents-Kara Sea. The above observed features are supported by an Atmospheric General Circulation Model experiment. Thus, under present climate conditions, Arctic sea-ice loss is a possible factor modulating the wave propagation during the WPV events. We also find that the WPV events in light-ice years have stronger stratosphere-troposphere coupling, followed by colder midlatitude surface conditions particularly over Eurasia.

本文言語英語
ページ(範囲)858-869
ページ数12
ジャーナルJournal of Geophysical Research: Atmospheres
124
2
DOI
出版ステータス出版済み - 1 27 2019

All Science Journal Classification (ASJC) codes

  • 大気科学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学

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