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 Sustainable Development Goal(s)

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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 - 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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