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: ジャーナルへの寄稿記事

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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.

元の言語英語
ページ(範囲)858-869
ページ数12
ジャーナルJournal of Geophysical Research: Atmospheres
124
発行部数2
DOI
出版物ステータス出版済み - 1 27 2019

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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