An Icelandic cyclone , photographed on September 4, 2003. Icelandic low is the center of a near-permanent large depression located between Iceland and southern Greenland. In the winter of the Northern Hemisphere it extends to the Barents Sea. In winter, the temperature of the oceans is much warmer than that of the continents, and this difference in temperature causes the Icelandic depression. The depression largely controls the winds in the North Atlantic Ocean and gives rise to many winter cyclones. In summer the depression weakens and divides into two different centers ; One center is the Davis Strait and the other is west of Iceland. Its average air pressure in January was 996 millibars. Gulf currents push the Icelandic depression northward. The depression has formed a pole of the North Atlantic movement ; The other pole is Azores high pressure.