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| Titel |
Asymmetric changes in bi-hemispheric circumpolar vortex in the warmer climate |
| VerfasserIn |
Gwangyong Choi, David A. Robinson, Junsu Kim |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103340
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| Publikation (Nr.) |
 EGU/EGU2015-2749.pdf |
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| Zusammenfassung |
| In this study, the observed changes and future projections of polar atmospheric circulation and potential linkages with the changing cryosphere are examined. Long-term snow and ice extent data records derived from satellite imagery (NOAA AVHRR/Microwave) and circumpolar vortex (CV) variables extracted from reanalysis and modeled geopotential height data sets are utilized in the investigation. Time series analysis of observed data sets demonstrates that the Northern Hemisphere CV in warm seasons has regressed poleward with variability of meridional meandering at regional scales, while the year-round Southern Hemisphere CV with a rather consistent shape is trendless. These asymmetric changes in bi-polar CV pathways may be associated with asynchronous disappearing cryospheric extents between the two hemispheric during warm seasons. CMIP5 modeled data sets confirm that these discrepancies in polar circulations between the two hemispheres will increase in a warmer 21st century due to intensification of the imbalance in ice mass and seasonal snow extent between the hemispheres. |
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