Weather Regime Transitions and the Interannual Variability of the North Atlantic Oscillation. Part I: A Likely Connection
ABSTRACT In this study, the relationship between weather regime transitions and the interannual variability of the North Atlantic Oscillation (NAO) in winter during 1978-2008 is examined by using a statistical approach. Four classical weather regimes-the two phases of the NAO (NAO ) transitions take...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1047.957 http://www.meteo.psu.edu/%7Esbf1/papers/Luo_Cha_Feldstein.part1.pdf |
| Summary: | ABSTRACT In this study, the relationship between weather regime transitions and the interannual variability of the North Atlantic Oscillation (NAO) in winter during 1978-2008 is examined by using a statistical approach. Four classical weather regimes-the two phases of the NAO (NAO ) transitions take place. Furthermore, the NAO regime transition is found to be more likely to enhance the eastward shift of the NAO 1 (NAO 2 ) anomaly. Thus, it is hypothesized that the interannual change in the winter-mean NAO index from P1 to P2 is related to the intraseasonal NAO 2 to NAO 1 (NAO 1 to NAO 2 ) transition events during P1 (P2) because of the variation of the NAO pattern in intensity, location, and frequency (number of days). This finding is also seen from calculations of the winter monthly mean NAO index with and without NAO regime transitions. |
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