Publication Abstracts

Takahashi et al. 2024, accepted

Takahashi, H., C.M. Naud, D.J. Posselt, and G.A. Duffy, 2024: Systematic differences between the Northern and Southern Hemispheres: Warm frontal ice water path linked to the origin of extratropical cyclones. J. Climate, accepted.

Extratropical cyclones (ETCs) produce most of the winter precipitation at mid latitudes, and are often associated with the most extreme winter weather events. For climate models to accurately predict the occurrence and severity of these extreme events in a changing climate, they need to accurately represent moist processes in general and ice processes in particular. To provide an observational constraint for model evaluation, because cloud cover and precipitation are prevalent in warm frontal regions, a compositing method is applied to ice retrievals from satellite observations to explore the ice distribution across warm fronts in both hemispheres. Ice water path (IWP) and its variability are compared between the northern hemisphere (NH) and the southern hemisphere (SH) warm fronts for different ETC-wide characteristics, as well as for different ETC origination regions. Results reveal that warm frontal IWP and its variability tend to be higher in the NH than the SH, even when controlling for the ETC strength and environmental precipitable water (PW). IWP differences between NH and SH are found to be primarily related to where the cyclones originate. As the Intertropical Convergence Zone is shifted north, ETCs that originate close to the Northern Tropics have more PW than those that originate close to the Southern Tropics. This, in turn, seems to lead to larger IWP in NH frontal clouds than in the SH frontal clouds at a later time. This highlights the importance, for ice amounts generated in warm frontal regions, of the environmental conditions that an ETC encounters during its genesis phase.

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BibTeX Citation

@unpublished{ta04200y,
  author={Takahashi, H. and Naud, C. M. and Posselt, D. J. and Duffy, G. A.},
  title={Systematic differences between the Northern and Southern Hemispheres: Warm frontal ice water path linked to the origin of extratropical cyclones},
  year={2024},
  journal={J. Climate},
}

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RIS Citation

TY  - INPR
ID  - ta04200y
AU  - Takahashi, H.
AU  - Naud, C. M.
AU  - Posselt, D. J.
AU  - Duffy, G. A.
PY  - 2024
TI  - Systematic differences between the Northern and Southern Hemispheres: Warm frontal ice water path linked to the origin of extratropical cyclones
JA  - J. Climate
ER  -

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