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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)858-869
Number of pages12
JournalJournal of Geophysical Research: Atmospheres
Volume124
Issue number2
DOIs
Publication statusPublished - Jan 27 2019

Fingerprint

Upper atmosphere
Sea ice
polar vortex
sea ice
Arctic region
Vortex flow
ice
vortices
Ice
Barents Sea
Wave propagation
wave propagation
Atmospheric General Circulation Models
Troposphere
temperate regions
atmospheric general circulation model
stratosphere
General Circulation Models
troposphere
climate conditions

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

Cite this

Weak Stratospheric Polar Vortex Events Modulated by the Arctic Sea-Ice Loss. / Hoshi, Kazuhira; Ukita, Jinro; Honda, Meiji; Nakamura, Tetsu; Yamazaki, Koji; Miyoshi, Yasunobu; Jaiser, Ralf.

In: Journal of Geophysical Research: Atmospheres, Vol. 124, No. 2, 27.01.2019, p. 858-869.

Research output: Contribution to journalArticle

Hoshi, Kazuhira ; Ukita, Jinro ; Honda, Meiji ; Nakamura, Tetsu ; Yamazaki, Koji ; Miyoshi, Yasunobu ; Jaiser, Ralf. / Weak Stratospheric Polar Vortex Events Modulated by the Arctic Sea-Ice Loss. In: Journal of Geophysical Research: Atmospheres. 2019 ; Vol. 124, No. 2. pp. 858-869.
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