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Empiryczne funkcje własne regionalnego pola barycznego w basenie Północnego Atlantyku i Europy

Miętus M.

Problemy Klimatologii Polarnej

1999

nr 9

9—22

The Empirical Orthogonal Functions method has been applied to study the spatial and time variability of the large scale pressure over North Atlantic and Europe during the period 1871-1990. The dominating mode of spatial variability, NAO-like, explains 33% of the total variance and presents the zonal air mass flow over the region. Such mode of variability is characterized by systematic intensification of westerly flow over the region during last 120 years. The second pattern presents two pressure systems of opposite sign over region of consideration. It explains 20% of the total variance. The centers of one pressure system is located over the continent, in the north-eastern part of the region. The second center is localized over the ocean, however is int1uencing the great part of Europe. The third pattern. explaining 18% of total variance, presents the region under influence of large scale pressure system with center located over northern Ireland and Scotland. The fourth pattern presents the region under influence of the three pressure systems. This mode explains10% of the total variance. The three leading modes explain more than 80% of the total variance in case of 50⁰N.