n.（法、德）菲恩

The ice in this area is transitioning from snow to firn, indicating the early stages of glacier formation.
这个区域的冰从雪开始向firn转变，表明了冰川形成的早期阶段。
Firn has a density that is intermediate between snow and solid ice, making it a unique form of ice.
firn的密度介于雪和固态冰之间，使其成为一种独特的冰的形式。
The study of firn cores can provide valuable information about past climate conditions.
firn芯的研究可以提供关于过去气候条件的宝贵信息。
As the firn layer deepens, the weight of the overlying snow compacts it into ice.
随着firn层的加深，上覆雪的重量将其压实成冰。
The melting and refreezing cycles of firn play a crucial role in the water cycle of polar regions.
firn的融化和重新冻结周期在极地地区的水循环中起着至关重要的作用。
Firn can trap air bubbles, preserving a record of atmospheric composition over time.
firn可以捕获气泡，随着时间的推移保存大气组成的记录。
In some areas, the firn layer can be several hundred meters thick before it turns into ice.
在一些地区，firn层可以达到几百米厚才会变成冰。
The transition from firn to ice is a gradual process that occurs over many years.
从firn到冰的转变是一个渐进的过程，需要数年的时间。
Firn is an important factor in the stability of glaciers and ice sheets.
firn是影响冰川和冰盖稳定性的关键因素。
Researchers use radar technology to study the internal structure of firn and understand its properties.
研究人员使用雷达技术研究firn的内部结构，以了解其性质。