Ayarzaguena et al. 2014. Cohen et al. 2010. Jung et al. 2011. Extreme negative AO/NAO. Record cold ... Tropical DA. Global DA. NOVEMBER. Z500 Anomaly.

is a Dirac function at the point (6000,6760,10). To discretize the problem (1) on a coarser mesh, the velocity is sub-sampled to less number of cells such that every cell has a constant velocity and contains one or more mesh elements. Then the proble