CHARACTERISTICS OF PRECIPITATIONS TRENDS IN THE AREA OF IAȘI, BACĂU AND SUCEAVA AIRPORTS OVER THE LAST 50 YEARS
L.APOSTOL, D. Machidon, O.MACHIDON, D. Buruiana
ABSTRACT – Characteristics of precipitations trends in the area of Iași, Bacău and Suceava airports over the last 50 years. The paper is based primarily on the factual material represented by continually measured data during the 1961-2010 period by the weather stations from National Meteorological Administration network witch are located in Iaşi, Bacău and Suceava airports area. The data is summarised in tables and the interpretation is supported by graphs. The statistical-mathematical processing of the climatic data and their graphical representation are the methods through which the corpus of data collected from the weather stations measurements has been developed. Furthermore, both methods were used in the graphical transposition of the results obtained by averaging the data from the three weather stations. In order to establish a trend, we have used the method of sliding averages, on a time series of 10 years, shifted with a year calculated by averaging the values recorded by those weather stations. The trend line has been drawn by using EXCEL. Long-term trends, in 1961-2010 period, of the evolution in the atmospheric precipitation amounts indicates a rising trend for the last 15 years. The average annual number of days with a precipitation of > 20 and 30 mm indicates a shift of the deviations towards the register of values above average, which is argument case in point for the increasing torrential nature of precipitation over the last 50 years in the area of Iasi, Bacau and Suceava airports.
Keywords: atmospheric precipitation, Iași, Bacău și Suceava airports, torrential rain, trends