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.
- Asymmetry between the two hemispheres
- Isentropic analysis
- Polar cold air mass
ASJC Scopus subject areas
- Atmospheric Science