NDLI: Multi-periodic climate dynamics : spectral analysis of long-term instrumental and proxy temperature records

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Multi-periodic climate dynamics : spectral analysis of long-term instrumental and proxy temperature records

Content Provider	Semantic Scholar
Author	Lüdecke, H. Hempelmann, Annika Weiss, Carlos O.
Copyright Year	2012
Abstract	The longest six instrumental temperature records of monthly means reach back maximally to 1757 AD and were recorded in Europe. All six show a V-shape, with temperature drop in the 19th and rise in the 20th century. Proxy temperature time series of Antarctic ice cores show this same characteristic shape, indicating this pattern as a global phenomenon. We used the mean of the 6 instrumental records for analysis by discrete Fourier transformation (DFT), wavelets, and the 5 detrended fluctuation method (DFA). For comparison, a stalagmite record was also analyzed by DFT. The harmonic decomposition of the mean shows only 6 significant frequencies above periods over 30 yr. The Pearson correlation between the mean, smoothed by a 15 yr running average (boxcar) and the reconstruction using the 6 significant frequencies yields r=0.961. This good agreement has a> 99.9% confidence level confirmed by Monte Carlo simulations. It shows that the climate dynamics 10 is governed at present by periodic oscillations. We find indications that observed periodicities result from intrinsic dynamics.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.clim-past.net/9/447/2013/cp-9-447-2013.pdf
Alternate Webpage(s)	http://www.clim-past-discuss.net/8/4493/2012/cpd-8-4493-2012.pdf
Alternate Webpage(s)	https://www.clim-past-discuss.net/8/C2198/2012/cpd-8-C2198-2012-supplement.pdf
Language	English
Access Restriction	Open
Subject Keyword	Advance Directive - Proxy Command & Conquer:Yuri's Revenge Detrended fluctuation analysis Direct Fluorescent Antibody Test Discrete Fourier transform Monte Carlo method Quantum fluctuation Simulation Smoothing (statistical technique) Time series Wavelet
Content Type	Text
Resource Type	Article

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