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Median ice particle number concentration N (L−1) vs. latitude and representative cloud altitude, Zc, during 2008 and 2013 using three formulations: SPARTICUS N(D)1=0 (left), TC4 N(D)1 unmodified (center), and TC4 N(D)1=0 (right). Panels from top to bottom are for DJF over oceans, DJF over land, JJA over oceans, and JJA over land.
