Tidal changes of the barometric pressure in the area of Thessaloniki (original) (raw)

Abstract

The marginal presence of the frequencies 0.03629 and 0.073036 cycles per day in the power spectrum of the daily measurements series of barometric pressure, was detected during an investigation upon the influence of barometric pressure and earth tides on the shallow underground water level variations in the area of Volvi. These frequencies coincide with those of the Mm(period of 27.55 days) and Mf(period of 13.69 days) constituents of the earth tides indicating a possible influence of the earth tides upon the barometric pressure. In order to investigate the influence of the earth tides upon the barometric pressure we analyzed a sample of five years hourly measurements (43,056 values) of barometric pressure in the area of Thessaloniki. The accuracy of these measurements was estimated to be equal about ±0.1hPa. The tidal analysis showed that the signal to noise ratio varies from 9 to 23 for the long period waves (Ssa, Mm, Mf, Mtm). For the short period constituents the corresponding qu...

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