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Isolines and wind intensity for 40 years (1961–2000) mean wind field (m/s) at 850 hPa for (a) summer (DJF), (b) autumn (MAM), (c) winter (JJA), and (d) spring (SON). Original ERA-40 2.5° × 2.5° data (left column) and PRECIS outputs for runs driven by ERA-40 C (center column) and ECHAM4 (right column). Wind intensity is shaded.
