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。
You can't work with an average, squashing together the way heat radiation goes through the dense, warm, humid lower atmosphere with the way it goes through the thin, cold, dry upper atmosphere.
通过平均法计算是行不通的，即不能将热力在密实、温暖、潮湿的底层大气层中辐射的方式，与在稀薄、寒冷、干燥的上层大气层中的辐射方式混为一谈。
Water vapor in the lower atmosphere can vary in amount from a mere trace in arid regions to about 4% by volume in moist areas.
大气低层的水汽量在干燥地区（量）甚微，而在潮湿地区按体积占4%左右。
If more high clouds were to form, more heat energy radiating from the surface and lower atmosphere toward space would be trapped in the atmosphere, and Earth's average surface temperature would climb.
如果有更多高云生成，则大气将吸收更多能量，地球温度也将攀升。
The relatively low-level cumulus clouds (below 15,000 feet) shown in this image are likely the product of moisture near ground level being cooked by the Sun and convected into the lower atmosphere.
上图中，相对较低的积云（低于4500米）很可能是地面附近的水汽受太阳辐射，与低层大气发生对流所形成的。
The relatively low-level cumulus clouds (below 15, 000 feet) shown in this image are likely the product of moisture near ground level being cooked by the Sun and convected into the lower atmosphere.
上图中，相对较低的积云（低于4500米）很可能是地面附近的水汽受太阳辐射，与低层大气发生对流所形成的。
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。
During the 1990s this was a point on which doubters laid considerable weight, because satellite measurements did not show the warming in the lower atmosphere that theory would predict.
在上世纪九十年代里，怀疑论者尤其关注这个观点，因为那时卫星测量还无法显示，底层大气的暖化效应——在当时，这只是一个理论的推测。
Though different teams still get different amounts and rates of warming in the lower atmosphere, there is no longer any denying that warming is seen.
虽然不同团队仍然得到不同的大气低层变暖程度和变暖速率，但是变暖这事实却是无庸置疑的。
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。
Turbulent motion refers to the process by which heat and moisture are transferred from the land or ocean surface to the lower atmosphere.
而这两个过程是：纵向和横向运动湍流热传输。湍流运动指的是热量和水分从地表或海洋表面转移到低层大气中的过程。
The theory was that 'brown clouds' were cooling the lower atmosphere and therefore masking some of the warming effects of greenhouse gases.
有一种理论认为“棕色云”让低层大气变冷，从而掩盖了温室气体的一些致暖效应。
In the lower atmosphere, pollutants like sulphur dioxide "rain out" of the air within days.
在大气层底部，像二氧化硫等污染物会随着下雨几天内就从空气中排出。
Adding to those greenhouse gases in the atmosphere makes it harder still for the energy to get out. As a result, the surface and the lower atmosphere warm up.
温室气体在大气中的增加，会使能量较不容易离开地球，因而导致地表和对流层的温度上升。
As a result, the surface and the lower atmosphere warm up.
因此，地表和低层大气的温度相应升高。
In the lower atmosphere the oxides of nitrogen add to an increase in ozone and small particles, which can cause respiratory ailments.
在低层大气里，氮氧化物使臭氧和可以引致呼吸道疾病的微粒增加。
Air launches are also a greener way of getting into space, because they avoid igniting rockets in the lower atmosphere.
从环保角度来讲，空基发射也有其优越性：不需要在近地面大气层中点燃火箭。
The lower image shows a vertical profile of the atmosphere, revealing that the ash was between four and six kilometers high on May 16.
下部的图像显示的是大气的垂直廓线，表明5月16日火山灰高度在4到6公里之间。
The ground floor on the lower level is the only one which does not have view to the river, but it creates its own unique atmosphere by transforms 6m level difference to its own floor height.
在下部的地面层是唯一不能欣赏汉江的风景的一层，但是通过消化6米的高差转变为自己的层高，也创造了一个独特的氛围。
350’s ultimate goal is to achieve global action to lower the concentration of carbon dioxide in the atmosphere to 350 parts per million.
350的终极目标是要把全球温室气体浓度削减至350ppm二氧化碳当量。
We have also carefully applied our technology to keep pollution to the lower levels, and have been particularly concerned with the effect upon your atmosphere.
我们还认真的运用我们的技术降低地球污染的水平，因为我们实在是为你们的生活环境担忧。
Sometimes the ring comes down and curves into the lower atmosphere.
有时这个环会下降，弯入在气层的下层。
Eventually atmospheric drag removes them from orbit by lowering their altitudes until they burn up on reentry into the dense lower atmosphere.
最终空气阻力会使它们高度降低、出轨道，在重返地表的过程中，被浓密的低层大气燃烧殆尽。
The humanity has discharged the massive coal smokes, the dust as well as other molecules to the lower atmosphere, the climate scientist is called "the human volcano".
人类向低层大气中排放了大量的煤烟、灰尘以及其他微小颗粒，气候科学家称为“人类火山”。
Spacecraft: Vehicle designed to operate, with or without a crew, in a controlled flight pattern above Earth's lower atmosphere.
航天器：设计在地球低层大气上按受控飞行路线运行的载人或不载人的飞行器。
Spacecraft: Vehicle designed to operate, with or without a crew, in a controlled flight pattern above Earth's lower atmosphere.
航天器：设计在地球低层大气上按受控飞行路线运行的载人或不载人的飞行器。
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