THE INFLUENCE OF EUROPEAN CLIMATE VARIABILITY MECHANISM ON AIR TEMPERATURE IN ROMANIA
M. MATEI
ABSTRACT. - The influence of European climate variability mechanism on air temperature in Romania. The main objective of the present paper is to analyze the temporal and spatial variability of air-temperature in Romania, by using mean air-temperature values provided by the ECA&D project (http://eca.knmi.nl/). These data sets will be filtered by means of the EOF (Empirical Orthogonal Function) analysis, which describes various modes of space variability and time coefficient series (PC series). The EOF analysis will also be used to identify the main way of action of the European climate variability mechanism, by using multiple variables in grid points, provided by the National Centre of Atmospheric Research (NCAR, USA). The variables considered here are: sea level pressure (SLP), geopotential height at 500 mb (H500) and air temperature at 850 mb (T850), for the summer and winter seasons. The linear trends and shift points of considered variables are then assessed by means of the Mann-Kendall and Pettitt non-parametric tests. By interpreting the results, we can infer that there is causal relationship between the large-scale analyzed parameters and temperature variability in Romania. These results are consistent with those presented by Busuioc et al., 2010, where the main variation trends of the principal European variables are shown.
Keywords: EOF analysis, coefficient time series, non-parametric tests, Romania, Europe