Most of the Arctic is covered in snow and ice, which are highly reflective; if snow and ice melt, the exposedsoil, which absorbs heat, serves to accelerate warming.
北极大部分地区被冰雪覆盖，具有很强的反射性；如果冰雪融化，裸露的土壤吸收热量，有助于加速变暖。
2
Soil background of vegetation is very important to the C retrieval, especially during the beginning growth with much exposedsoil.
土壤背景对植被覆盖率估算有较大的影响，这种影响在植被生长初期最大，即暴露土壤较多时。
3
By late November, crops had been harvested and many of the fields were bare. The exposedsoil ranges from pale tan to brown in the image.