Links between NAO fluctuations and interannual variability of precipitation in the Seine river watershed

Nicolas Fritier, Benoit Laignel, Alain Durand, Bastien Dieppois, Julien Deloffre

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The inter-annual to multi-decadal winter variability (DJFM) of precipitation on the Seine River watershed (France) was analysed using continuous wavelet transform analysis and compared to the winter North Atlantic Oscillation Index (NAOI). Nine weather stations were used over the 1951 to 2004 period and confirmed the homogeneity of inter-annual fluctuations for all stations but one. Wavelet coherence between SLP over the Icelandic and Azores regions and precipitation highlighted coherence for different scales of variability according to the centre of action considered. Segmentation and wavelet analysis and coherence between precipitation and NAOI over a long period of time (1873–2004) showed: i) increasing variability across the last century at most time scales, especially for NAOI; ii) the existence of change points for the mean and variance of both signals; iii) overall discontinuity of the coherence whatever the scale considered, especially between ∼1910 and ∼1955 for inter-decennial to pluri-decennial scales.
Original languageEnglish
Pages (from-to)396-405
Number of pages10
JournalAcademie des Sciences. Comptes Rendus. Geoscience.
Volume344
Issue number8
DOIs
Publication statusPublished - 2012

Keywords

  • North Atlantic Oscillation Index
  • Seine River watershed
  • Inter-annual climate fluctuations
  • Precipitation variability
  • Continuous wavelet transform
  • Segmentation

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