Arctic‐Atlantic Cyclones: Variability in Thermodynamic Characteristics, Large‐Scale Flow, and Local Impacts
Abstract Cyclones at polar latitudes of the Atlantic‐Arctic corridor exhibit different thermodynamic characteristics. Midlatitude‐origin cyclones, which make up about 14% of wintertime cyclones in the region, are generally warm and moist. The more numerous Arctic‐origin cyclones display a wide range...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-03-01
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| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2024GL111769 |
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| Summary: | Abstract Cyclones at polar latitudes of the Atlantic‐Arctic corridor exhibit different thermodynamic characteristics. Midlatitude‐origin cyclones, which make up about 14% of wintertime cyclones in the region, are generally warm and moist. The more numerous Arctic‐origin cyclones display a wide range in the boundary‐layer equivalent potential temperature θe that depends on both temperature and moisture. This spread includes large positive and negative θe anomalies, leading to weak signals in composite means. Warm/moist (high‐θe) cyclones at polar latitudes are associated with tilted and central jet regimes, steering cyclones of midlatitude‐origin into the Barents region or preconditioning the environment for Arctic genesis. Conversely, cold/dry (low‐θe) Arctic‐origin cyclones form under a jet stream positioned far south, characterized by frequent southern jet regimes. These new insights into the large variability of Barents cyclones have implications for our understanding of genesis mechanisms, cyclone development, and their effect on the climate of the polar regions. |
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| ISSN: | 0094-8276 1944-8007 |