C. Mares1, I. Mares1, A. Stanciu1, M. Mihailescu2, 1 National Institute of Hydrology and Water Management Sos. Bucuresti – Ploiesti, 97, Bucharest, Romania 2 Agricultural University, Bucharest, Romania constantin.mares@hidro.ro    Abstract The North Atlantic Oscillation (NAO) is represented through a circulation index which emphasizes the difference between the characteristics of the atmospheric circulation at high […]