NASA照片-庞然的冰川

伤我心太深

每逢十二月，当黑夜笼罩在北极上空，南极洲就开始享受着极昼的阳光。然而，当太阳每天沿着着地平线转动时，阳光只能以很低的角度到达南极大陆，将这里的冰山制造出长长的影子，投射在周围的海冰之上。

Acquired on December 13, 2010, this image from the Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite shows icebergs along the Princess Ragnhild Coast in East Antarctica. Besides distinguishing between icebergs and thinner ice, the low-angled Sun highlights the differences between the icebergs themselves.

NASA的地球监测1号卫星（EO-1）搭载的先进陆地成像仪（ALI）于2010年12月13日截取到这一图景，显示出在东南极大陆的朗希尔德公主海岸（Princess Ragnhild Coast）沿岸的冰山群。在这里，低角度的光线既能将冰山和厚层冰分辨出来，又能描绘出不同冰山之间的差异。

Near the top center of the image, two large icebergs sport smooth surfaces. The iceberg next to them, and others along the left and right edges of the image, have mottled surfaces resembling druzy. The differences in texture indicate different histories. The icebergs with rough surfaces likely broke off from the coast, far from this area, and spent time bobbing over the open ocean. Wave action applied pressure to the bottoms and sides, and the pressure propagated up through the ice to the surface. Weak spots fractured, and bits of snow and ice fell into the cracks, widening them further. The icebergs you see above likely bear scars from such jostling. By contrast, smooth icebergs likely originated in this area and have not yet traveled far.

在图片上方中央位置，两座大冰山投射出平滑的表面。而相邻的冰山以及在图片左右侧的其他冰山，则显得斑驳陆离有如矿石晶簇一般。这些冰山纹理上的差异暗示出其经历的不同历史。有着粗糙表面的冰山可能是从远离这片地区的某处海岸断裂出来，然后在广阔的海洋上历经时日漂浮过来。海浪的作用力向其底部及侧部挤压，这股压力向上传递至冰山的表面。较脆弱的部位会因此裂开，同时一些冰雪落入裂开的狭缝处，使其愈加扩大。刚才所说那些冰山的累累伤痕，就是由这种挤压所形成的。

Surrounding the icebergs are two kinds of ice: sea ice and fast ice. Along the left edge of the image, the sea ice is thinner, with gaps that reveal the dark ocean below. Clinging to the shore, fast ice is thicker, although not nearly as thick as the icebergs.

在冰山周围存在着两种冰：海冰和固定冰。沿着图片左边缘的海冰，显得更薄，从缺口处可以看到其下的深色海水。而附着在岸边的固定冰，尽管比不上冰山，但也相比海冰更厚一点。

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