Stratospheric air generally rises above tropical latitudes, spreads toward the poles, and then sinks back toward the lower atmosphere at high latitudes.

平流层的空气一般停留在对流层上空，向两极移动，然后再下沉到高纬度带的低层大气。

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They typically occur in the lower atmosphere ahead of a storm front.

它们通常于暴风雨前在低层大气中露面。

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This means that in a world where greenhouse warming is wetting the atmosphere, the lower parts of the atmosphere should warm at a greater rate than the surface, most notably in the tropics.

这就意味着，在一个温室效应增加空气湿度的世界里，底层大气的暖化率要远远高于地表，这个现象在热带地区尤为明显。

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"But,it is also many of the gases, which are the greenhouse gases that are also influencing the quality of the air when they are abundant in the lower atmosphere."

VOA: standard.2009.03.23

Laine believes that a Lunar space elevator would be much easier to construct than one on Earth, due to the lack of atmosphere and lower gravity.

FORBES: Liftport Is Kickstarting A Space Elevator - For The Moon

The instruments on OCO would have examined the lower atmosphere, and in finer detail.

ECONOMIST: Greenhouse gases

But it also has a breathable atmosphere and much lower radiation levels and is a lot easier to reach.

ECONOMIST: Planetary pretenders