The Shift of the Atmospheric Circulation Patterns and Its Impacts on Western Mediterranean
Cumulating ocean-atmospheric energy caused by global warming has resulted in the reversal of the energy balance towards the poles. This situation is characterized by a new ocean-continental thermal distribution: this new surplus energy balance imposes a “New Atmospheric Circulation” predominantly meridian, and a “New Water Cycle” characterized by the intensity of evaporation, extreme precipitation, and a different rain distribution pattern: it is the actual “Warmed New Climate”. Thanks to satellite observation and daily monitoring of meteorological conditions for more than ten years, we have observed that the positive balance has shifted more towards the poles, mainly in the northern hemisphere. Subtropical anticyclones are strengthened and have extended to high latitudes, especially over the Atlantic Ocean. This situation creates global peaks strengthened in winter periods, and imposes on cosmic cold (The cosmic cold settles in winter around the poles when the energy balance is extremely deficient.) the deep advection toward the south under the form of planetary valleys “Polar Vortex” [Barnes in Geophys. Res. Lett. 40(17):4734–4739, 2013; Francis and Vavrus in Geophys. Res. Lett. 39(6), 2012; Lindsey in Polar vortex brings cold here and there, but not everywhere. NOAA, 2014 1, 2, 3]. This situation imposes a pronounced ripple on the jet stream and installs a Meridian (The circulation is along a meridian, north/south and south/north.). Atmospheric Circulation (MAC) in winter, which brings the warm tropical air masses to reach the Arctic Circle, and cold polar air masses to reach Western Mediterranean. This situation creates unusual atmospheric events, characterized by “extreme” conditions: excessive heat at high latitudes, accompanied by heavy rains and floods, as well as cold at low latitudes and the appearance of snow in the Sahara!
KeywordsNew climate Extreme rainfall Western Mediterranean Morocco MAC
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