干燥的冰原南极洲有巨厚的冰雪,平均厚度达2000米以上,其冰雪体积占世界冰雪总体积的90％以上,占世界淡水总量的62％,是地球上最大的淡水水库。可是,提起南极洲的气候特征,除了酷寒和烈风以外还有“干燥”。其原因是南极洲大部分地区年平均降水量为55毫米以下,降水最少的地方不足5毫米;并且,由于气候寒冷,年平均气温在-25℃以上,极端最低气温- Dry Ice Antarctica Antarctica has immense snow and ice, with an average thickness of over 2,000 meters. Its ice and snow accounts for more than 90% of the world’s total snow and ice, and accounts for 62% of the world’s total fresh water. It is the largest freshwater reservoir on the planet. However, mentioning the climate characteristics of Antarctica has “dryness” in addition to cold and gale. The reason for this is that the average annual precipitation in most parts of Antarctica is less than 55 mm, and the area with the least precipitation is less than 5 mm; and, because of the cold weather, the annual average temperature is above -25°C, the extreme minimum temperature -