Authors: Asok K Sen Darko Ogrin
Publish Date: 2015/02/05
Volume: 123, Issue: 3-4, Pages: 733-739
Abstract
Long instrumental records of meteorological variables such as temperature and precipitation are very useful for studying regional climate in the past present and future They can also be useful for understanding the influence of largescale atmospheric circulation processes on the regional climate This paper investigates the monthly winter and annual temperature time series obtained from the instrumental records in Zagreb Croatia for the period 1864–2010 Using wavelet analysis the dominant modes of variability in these temperature series are identified and the time intervals over which these modes may persist are delineated The results reveal that all three temperature records exhibit lowfrequency variability with a dominant periodicity at around 77 years The 77year cycle has also been observed in the temperature data recorded at several other stations in Europe especially in Northern and Western Europe and may be linked to the North Atlantic Oscillation NAO and/or solar/geomagnetic activity
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