Comparison study of the polar cold air mass between Northern and Southern Hemispheric winters based on a zonal-mean two-box model

Yuki Kanno, Takamichi Shoji, Toshiki Iwasaki

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The characteristics of the polar cold air mass (PCAM) below a threshold potential temperature θT are quantitatively compared between two hemispheric winters and analyzed with a zonal-mean two-box model. This model estimates a residence time in a genesis box, a life time in a loss box, and PCAM flux between them. The hemispheric total PCAM amount below θT =280K in the Northern Hemispheric winter is approximately 40% greater than that in the Southern Hemispheric winter. This difference is attributed to the residence time enhanced due to the land-sea distribution and mountain barriers, while the PCAM flux is almost equivalent between the two winters.

Original languageEnglish
Pages (from-to)70-76
Number of pages7
JournalAtmospheric Science Letters
Volume16
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Asymmetry between the two hemispheres
  • Isentropic analysis
  • Polar cold air mass

ASJC Scopus subject areas

  • Atmospheric Science

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