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Seasonality of low‐frequency variability in early‐instrumental European temperatures
Author(s) -
Shabalova Marina V.,
Weber Susanne L.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl02760
Subject(s) - seasonality , proxy (statistics) , climatology , homogeneous , environmental science , range (aeronautics) , southern oscillation , north atlantic oscillation , atmospheric sciences , geology , el niño southern oscillation , physics , statistics , mathematics , statistical physics , materials science , composite material
The seasonality of low‐frequency temperature variability is studied by application of multichannel singular spectrum analysis to 7 long early‐instrumental European temperature records. Focus is on timescales longer than 50 years. We find that the temporal pattern of low‐frequency variability is clearly season‐dependent. Opposing winter/summer tendencies result in a weak variability on timescales longer than 50 yr in the annual‐mean data. Summer temperature variations seem to exhibit a preferential timescale in the range 60–80 years. An oscillation with this timescale is found to be significant against the red noise surrogates when analysing 4 long European paleo proxy records for summer temperature. The present results stress the necessity of using seasonally homogeneous datasets of paleo proxies for reconstructing low‐frequency variability patterns.