Publication Date:
2013-04-09
Description:
[1] Knowledge of the variability of climate in the past is essential for understanding current climatic changes. Therefore, we investigated two temperature indices and seven rainfall time series of North-Western Europe since the 17 th century. Trends and multi- to interdecadal variability are similar in England and Northern France for temperature, whereas a strong regional contrast is evident between the two regions for rainfall. Multi- and interdecadal variabilities display several periods of enhanced amplitude for both temperature and rainfall that may be related to large-scale climate control. On these scales, temperatures in both England and France display phase opposition with the Atlantic Multidecadal Oscillation (AMO) before 1800, while they are in phase afterwards, as determined by wavelet coherence. On the other hand, the relationships between temperature and the North Atlantic Oscillation (NAO) are weak across multi- and interdecadal scales for the whole period under study. For rainfall, coherence with AMO is observed for scales at around 30–60-year, whereas coherence with NAO is detected on 50–80-year and interdecadal 16–23-year scales. However, relationships between rainfall variability and North Atlantic climate indices are highly contrasted depending on the region considered. Finally, the results of a mixed spectral/EOF analysis of mean sea-level pressure on these co-oscillation time scales highlight not only NAO regimes, but also other patterns explaining a non-negligible amount of variance during certain time periods.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
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