Analysis of the hystorical precipitation sums of Sulina station by means of power  spectra in relation to Sibiu station and NAO and SOI

Precipitation is a very variable climatic element. It is highly variable, both temporally and spatially at different scales (inter-annual and intra-annual). The search for cycles in the climatic records can answer some of the complexities of the atmospheric system. This example uses the Sulina precipitation series (1868-2005) and Sibiu (1851-2005) to illustrate the relations of these two stations with each another as well as the influence of NAO and SOI indexes on them.The annual precipitation series of Sulina and Sibiu were analyzed by means of spectral analysis. The power spectra were calculated using the autocorrelation spectral analysis (ASA) and the maximum entropy spectral analysis (MEM). The cycles revealed were compared to other studies illustrating thus the influence of large scale phenomena such as El-Nino Southern Oscillation and North Atlantic Oscillation.

Keywords: precipitation, historical, Sulina, Sibiu, spectral analysis