All material © copyright by Weihao Pan. All rights reserved.
Here are some special pattern exist on glaciers which I shot from a doors-off helicopter. The bands here are the Ogives. The darker bands are devoid of ice-bubbles, are formed from melting & refreezing of ice in the summertime, and contain sediment accumulated at icefalls where open crevasses become a pit of deposition. The lighter bands are filled with snow & air bubbles from the non-summer months when precipitation is greatest, and a fresh snowpack acts as a layer of protection against weathering. Thus ogives are a seasonally created phenomenon. The crescent shape is due to velocity/friction differences between the lateral edges of a glacier where velocity is low & friction is high, and the middle part of a glacier where velocity is high & friction is low.