Lowest layer of atmosphere

The Troposphere: Where Weather Happens Of all the atmosphere's layer's, the troposphere is the one we're most familiar with (whether you realize it or not) since we live at its bottom -- the Earth's surface. It hugs the Earth's surface and extends upward to about high. Troposphere means, ‘where the air turns over’. A very appropriate name, since it is the layer where our day-to-day Starting at sea level, the troposphere goes up 4 to 12 miles (6 to 20 km) high. The bottom one third, that which is closest to us, contains 50% of all atmospheric gasses. This is the only part of the whole makeup of the atmosphere that is breathable. Thanks to its air being heated from below by the earth's surface which absorbs the sun's heat energy, tropospheric temperatures decrease as you travel up into the layer. Here the air doesn’t flow up and down but flows parallel to the earth in very fast moving increases as you go up, thanks to the abundance of natural ozone (O3) -- the byproduct of solar radiation and oxygen which has a knack for absorbing the sun's harmful UV rays. (Anytime temperatures increase with elevation in meteorology, it's known as an "inversion.") Since the stratosphere has warmer temperatures at its bottom and cooler air at its top, convection (thunderstorms) is rare in this part of the atmosphere. In fact, you can visibly spot its bottom layer in stormy weather by where the anvil-shaped tops of cumulonimbus clouds are. How so? Since the layer acts as a "cap" to convection...

• News • • Local News • Autos • Entertainment • Health • Politics • U.S. • World • Weather • • Latest Weather • Live Radar • Science of Weather • Download Weather App • Sports • • All Sports • CBS Sports Live • Lions • Pistons • Red Wings • Tigers • Michigan • Michigan State • Video • More • • Meet The Team • Contact Us • Station Info • News Tips • Contests & Promotions • Galleries • Advertise • Jobs • TV Schedule • Michigan Matters • Eye on the Future • Detroit Proud • Log In • • Search • Search • There are five major layers in the Atmosphere. Each one of the layers has unique details. Starting from the earth's surface and working our way high up in the atmosphere, we have the Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere. The troposphere is the lowest layer going from the earth's surface to about 4 miles to about 12 miles up in height. Note, that the height varies depending on location. This layer of the atmosphere is where we live and where most of our weather happens. Almost all clouds can be found here. Notice, I said almost... other types of clouds can still be found in other layers of the atmosphere. For instance, cumulonimbus clouds, the thunderstorm cloud, can have overshooting tops in the lowest parts of the stratosphere. So, let's talk about the stratosphere. This layer is from the top of the troposphere, we'll say around seven miles to 31 miles. This is more known as the ozone layer, and this is the highest point that jet planes can fly. Th...

The atmosphere is • When gas molecules are cool, they are sluggish and do not take up as much space. With the same number of molecules in less space, both air density and air pressure are higher. • When gas molecules are warm, they move vigorously and take up more space. Air density and air pressure are lower. Warmer, lighter air is more buoyant than the cooler air above it, so it rises. The cooler air then sinks down, because it is denser than the air beneath it. This is convection, which was described in the Plate Tectonics chapter. The property that changes most strikingly with altitude is air temperature. Unlike the change in pressure and density, which decrease with altitude, changes in air temperature are not regular. A change in temperature with distance is called a temperature gradient. The atmosphere is divided into layers based on how the temperature in that layer changes with altitude, the layer’s temperature gradient. The temperature gradient of each layer is different. In some layers, temperature increases with altitude and in others it decreases. The temperature gradient in each layer is determined by the heat source of the layer. Most of the important processes of the atmosphere take place in the lowest two layers: the troposphere and the stratosphere. Troposphere The temperature of the troposphere is highest near the surface of the Earth and decreases with altitude. On average, the temperature gradient of the troposphere is 6.5o ºC per 1,000 m (3.6o ºF per ...

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