这是因为中纬度和高纬度地区的林木线受到积雪存留时间和厚度的强烈影响。
This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover.
气溶胶在大气中随着纬度线由西向东易于扩散，但是将它们南北向传播则需要很多时间。
Aerosols disperse well in the atmosphere along the latitude lines as the winds blow west to east.But moving them north and south takes more time.
根据空中某个物体与地平线之间的角度可以确定纬度，然后根据地球旋转计算出经度。
You can determine latitude from the Angle between a celestial object and the horizon, and you can calculate longitude from the Earth's rotation.
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