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.
根据对船位线交角的最低要求，论述了在太阳移线定位中，以中天纬度线为参考，进一步安排中天附近以外观测太阳船位线所需时间间隔的估算。
According to the angle requirement for two ships position lines, this paper proposes the method to arrange the time to take the sun sight further than the one near the noon sight.
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.
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