Stratospheric Cooling: Why is it Cooler Than the Ground?

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In summary, the stratosphere is cooler than the ground because of CO2 emissions, and should no more CO2 enter the atmosphere, the troposphere would continue to heat up until the energy leaving the troposphere is the same as the energy entering it.
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Wannabeagenius
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Hi All,

Would someone explain why the stratosphere is cooler than the ground?

Thank you,
Bob
 
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Statospheric cooling, when taking the increasing CO2 amounts into account, is occurring because of the effects of CO2 as a greenhouse gas in the troposphere. CO2 slows down the rate at which longwave radiation can escape from the troposphere to the stratosphere, with the net effect being that the troposphere warms while the stratosphere cools.
 
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  • #3
rgatess said:
Statospheric cooling, when taking the increasing CO2 amounts into account, is occurring because of the effects of CO2 as a greenhouse gas in the troposphere. CO2 slows down the rate at which longwave radiation can escape from the troposphere to the stratosphere, with the net effect being that the troposphere warms while the stratosphere cools.

This makes sense. Thank you.

Is it fair to say that should no more CO2 enter the atmosphere, the troposphere would continue to heat up until the energy leaving the troposphere is the same as the energy entering it. At that point, the stratosphere will no longer be cooler than it was but will be at its original temperature?

Bob
 
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  • #4
GW is a closed topic due to the flame wars which arise.
 
  • #5
Evo said:
GW is a closed topic due to the flame wars which arise.

Is it allowed on any of these forums?
 
  • #6
Wannabeagenius said:
Is it allowed on any of these forums?
No, it's not. Questions about the atmosphere and how it works that stay out of GW discussions are fine.
 
  • #7
Wannabeagenius said:
Is it fair to say that should no more CO2 enter the atmosphere, the troposphere would continue to heat up until the energy leaving the troposphere is the same as the energy entering it. At that point, the stratosphere will no longer be cooler than it was but will be at its original temperature?
What original temperature?

The bottom of the stratosphere / top of the troposphere is inevitably going to be cooler than the surface because of thermodynamics. Temperature tends to decrease with increasing altitude in the troposphere because the lower atmosphere is for the most part either transparent to incoming sunlight or reflects it back into space. The top of the stratosphere is warmer than the bottom because sunlight heats the stratosphere thanks to the ozone layer absorbing the UV portion of incoming sunlight. There is a temperature inversion at the boundary between the troposphere and stratosphere.

Note that this has nothing to do with global warming; let's steer clear of that topic.
 

FAQ: Stratospheric Cooling: Why is it Cooler Than the Ground?

Why is the stratosphere cooler than the ground?

The stratosphere is cooler than the ground because it contains a much lower concentration of water vapor and other greenhouse gases. These gases trap heat and warm the lower atmosphere, but they are less prevalent in the stratosphere, allowing it to remain cooler.

What causes stratospheric cooling?

Stratospheric cooling is primarily caused by ozone depletion. Ozone is a gas that absorbs ultraviolet radiation from the sun, which warms the stratosphere. However, human activities such as the release of chlorofluorocarbons (CFCs) have led to a depletion of the ozone layer, resulting in stratospheric cooling.

How does stratospheric cooling affect the Earth's climate?

Stratospheric cooling can have a significant impact on the Earth's climate. It can lead to changes in wind patterns and the jet stream, which can alter weather patterns and affect the distribution of heat and moisture around the globe. It can also contribute to a phenomenon known as "stratospheric cooling feedback," where cooler temperatures in the stratosphere can lead to further ozone depletion and exacerbate the cooling trend.

Does stratospheric cooling have any benefits?

While stratospheric cooling can have negative effects on the Earth's climate, it also has some benefits. It helps to slow down the rate of global warming by reducing the amount of heat-trapping gases in the stratosphere. It also helps to protect the Earth's surface from harmful ultraviolet radiation by strengthening the ozone layer.

Is stratospheric cooling a recent phenomenon?

No, stratospheric cooling has been observed for several decades. In fact, it has been occurring since the 1970s when the depletion of the ozone layer began. However, with the implementation of regulations to reduce CFC emissions, the rate of stratospheric cooling has slowed down in recent years.

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