The February 2010 Arctic Oscillation Index
Theatmosphericdynamicsduringtheoccurrenceoftheextremenegativevalueofthe ArcticOscillationIndexinFebruary2010areinvestigatedusingmeteorologicalfields from ERA-Interim and ERA-40 reanalysis data. The study focuses on the possible causes of this anomalous value, finding that it was forced by a geopoten...
| Published in: | Quarterly Journal of the Royal Meteorological Society |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://www.openaccessrepository.it/record/134537 https://doi.org/10.1002/qj.1935 |
| Summary: | Theatmosphericdynamicsduringtheoccurrenceoftheextremenegativevalueofthe ArcticOscillationIndexinFebruary2010areinvestigatedusingmeteorologicalfields from ERA-Interim and ERA-40 reanalysis data. The study focuses on the possible causes of this anomalous value, finding that it was forced by a geopotential anomaly that propagated downward from the stratosphere to the troposphere in association with a major sudden stratospheric warming event which occurred at the end of January. An analysis of the dynamics of this warming is also developed, together with a comparison with past similar events. Synoptic and spectral properties of the geopotentialfieldsareanalyzed,andthetimeseriesofthe'BaroclinicActivityIndex' are computed, finding an abrupt increase of the middle latitude baroclinic activity immediately after the central date of the warming event. A possible interpretation of this feature is proposed. Copyright c |
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