Linear and nonlinear links of winter European precipitation to Northern Hemisphere circulation patterns
The connections between European rainfall variability in winter (from January to March) and Northern Hemisphere circulation patterns, as represented by 500-hPa geopotential height, are investigated in the period 1900-2014. Initially, three statistically signifcant pairs of linearly-related circulati...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/63955 |
| Acesso em linha: | http://hdl.handle.net/10017/63955 https://dx.doi.org/10.1007/s00382-018-4531-6 |
| Access Level: | acceso abierto |
| Palavra-chave: | European precipitation Teleconnections North Atlantic Oscillation East Atlantic Física Physics |
| Resumo: | The connections between European rainfall variability in winter (from January to March) and Northern Hemisphere circulation patterns, as represented by 500-hPa geopotential height, are investigated in the period 1900-2014. Initially, three statistically signifcant pairs of linearly-related circulation and precipitation patterns, explaining 45% of the variance in the latter feld, are identifed. The frst two essentially represent the North Atlantic Oscillation (NAO) and the East Atlantic (EA) patterns, while the third corresponds to a structure described in recent literature as a blend of the Pacifc North America (PNA) pattern and the so-called Asia Bering North America (ABNA) pattern. The residual precipitation feld is then examined for patterns that can introduce non-linear modulations into the circulation-precipitation links. It is so found that the NAO impact on European rainfall is modulated by North American and Pacifc factors controlling cyclogenesis over Newfoundland. The positive-phase EA rainfall anomalies over Central Europe and the British Isles seem to be markedly affected by the NAO phase. Finally, a possible signature from the Circumglobal Teleconnection Pattern disrupting the NAO influence on East Mediterranean precipitation anomalies is detected. |
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