THERMAL SCIENCE

International Scientific Journal

Nataša M. Martić-Bursać

,

Branislav L. Bursać

,

Vladan Ducić

,

Aleksandar R. Radivojević

,

Nenad V. Živković

,

Radomir D. Ivanović

,

Mrđan M. Đokić

,

Ljiljana S. Stričević

,

Milena J. Gocić

THE IMPACT OF MEDITERRANEAN OSCILLATIONS ON PERIODICITY AND TREND OF TEMPERATURE IN THE VALLEY OF THE NISAVA RIVER: A FOURIER AND WAVELET APPROACH

ABSTRACT
Periodicity of temperature on three stations in the Nisava River valley in period 1949-2014, has been analyzed by means of Fourier and wavelet transforms. Combined periodogram based on fast Fourier transform shows considerable similarity among individual series and identifies significant periods on 2.2, 2.7, 3.3, 5, 6-7, and 8.2 years in all datasets. Wavelet coherence analysis connects strongest 6-7 years spectral component to Mediterranean oscillation, starting in 1980s. Combined periodogram of Mediterranean oscillation index reveals 6-7 years spectral component as a dominant mode in period 1949-2014. Wavelet power spectra and partial combined periodograms show absence of 6-7 years component before 1975, after which this component becomes dominant in the spectrum. Consistency between alternation in temperature trend in the Nisava River valley and change in periodicity of Mediterranean oscillation was found. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. OI176008]
KEYWORDS
temperature, Nišava River valley, Mediterranean oscillation, wavelet transformation, periodogram
PAPER SUBMITTED: 2016-02-01
PAPER REVISED: 2016-03-03
PAPER ACCEPTED: 2016-08-31
PUBLISHED ONLINE: 2016-10-01
DOI REFERENCE: https://doi.org/10.2298/TSCI160201229M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 3, PAGES [1389 - 1398]
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The impact of Mediterranean oscillations on periodicity and trend of temperature in the valley of the Nisava River: A fourier and wavelet approach

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence