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

doi:10.1002/asl2.522

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

SCI - Geophysics

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The characteristics of the polar cold air mass (PCAM) below a threshold potential temperature θ_T 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 θ_T =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 language	English
Pages (from-to)	70-76
Number of pages	7
Journal	Atmospheric Science Letters
Volume	16
Issue number	1
DOIs	https://doi.org/10.1002/asl2.522
Publication status	Published - 2015 Jan 1

Keywords

Asymmetry between the two hemispheres
Isentropic analysis
Polar cold air mass

ASJC Scopus subject areas

Atmospheric Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/asl2.522

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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.",

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AU - Kanno, Yuki

AU - Shoji, Takamichi

AU - Iwasaki, Toshiki

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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.

AB - 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.

KW - Asymmetry between the two hemispheres

KW - Isentropic analysis

KW - Polar cold air mass

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

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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