We have an evaporation rate of about a quarter inch a day, so we have about 16 days of available water.

我们的蒸发率约为每天四分之一英寸，因此我们大约有 16 天的可用水。

The idea is that a slight warming would enhance evaporation rates and increase cloud cover, leading in the higher latitudes to more persistent accumulations of snow.

这种观点乍一看上去似乎不大明白，实际上很有道理。气温稍稍上升会使蒸发速度加快，云层加厚，从而使得纬度较高地区的积雪持续不断地增加。