| Autor: |
V. Pelino, F. Maimone, F. Ciciulla, P. Ripesi |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Quarterly Journal of the Royal Meteorological Society. 138:1961-1969 |
| ISSN: |
0035-9009 |
| DOI: |
10.1002/qj.1935 |
| Popis: |
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 |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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