Global Warming Denial: Is there a good argument?

sjastro

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Paradoxically the strongest evidence for AGW is based on temperature measurements of the lower stratosphere.
While AGW increases the temperature of the troposphere, the lower stratosphere which is immediately above the troposphere is getting colder.
This was a prediction made in 1967 before AGW was even a fashionable topic and has been confirmed by satellite measurements from 1979 onwards.

While there are other factors that contribute to lower stratospheric cooling such as ozone, stratospheric clouds, convection etc; once these factors are taken into account, the lower stratosphere is still getting colder due to the increasing amounts on greenhouse gasses in the troposphere.
While the maths is complicated a simplified explanation will suffice as to why the troposphere is warming up while the lower stratosphere is cooling as greenhouse gases increase.

Imagine the Earth’s atmosphere is devoid of greenhouse gases.
Solar radiation in the form of UV, visible and IR strikes the surface which warms up.
Longer wave radiation in the form of IR is radiated back into the atmosphere.
This is a simplified blackbody model.
Now lets add a greenhouse gas such as CO₂ to the atmosphere.
The CO₂ forms a layer in the troposphere.
CO₂ like any greenhouse gas molecule has an interesting property where the chemical bonds stretch, bend, vibrate and can absorb IR radiation.
When this occurs the molecule goes from a ground state to an excited state.
On returning to the ground state IR is re-radiated in all directions including back to the surface which forms the mechanism for greenhouse warming.
Increasing the amount of CO₂ is modelled as increasing the number of layers in the troposphere where each layer absorbs and re-radiates in all directions.
Each successive layer receives less IR radiation than the layer immediately below it.

In the lower stratosphere greenhouse gases also exist which contributes to heating but if CO₂ levels are increased in the troposphere, less IR reaches greenhouse gases in the lower stratosphere which results in cooling as more heat is radiated into space then is supplied by IR radiation from the troposphere, despite the temperature increase there.

Since the temperature changes of the troposphere and lower stratosphere are out of phase it eliminates the idea that current climate change is caused by variations in the solar radiation output, sunspots or Milankovitch cycles in which case temperature changes would be in phase.
 
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Justatruthseeker

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There is no man made global warming. When will everyone just accept the facts that it is a natural event that happens about every 125,000 years?????

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Is there global warming? Sure, just as there has been global warming every 125,000 years. is man the cause of it? No, that is just political garbage...
 
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GlabrousDory4

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There is no man made global warming. When will everyone just accept the facts that it is a natural event that happens about every 125,000 years?????

When will some people learn basic chemistry?

Here's what you are looking at: those are related to MILANKOVICH cycles which are ORBITAL variations of the earth around the sun and they are largely agreed to be the primary cause of the Cenozoic ice ages, meaning it gets colder and warmer in cycles.

NOW, here's something you may NOT KNOW: when you warm a body of water with CO2 dissolved into it the CO2 COMES OUT! (CO2 can LEAD and LAG temperature changes! Freshmen Chemistry students know this).

Not all global warming is due to CO2. Perhaps if you were more familiar with the literature related to paleoclimatology you'd know that! Indeed, sometimes global warming happens because of changes in the oceanic circulation which is impacted by where the continental masses are at on the earth!

We should be heading back into another Ice Age per our understanding of what drives ice ages. But we appear to be LATE. We are getting WARMER.

Why? Well because we have a FORCING that appears to have a bigger effect than subtle variations on orbital dynamics when it comes to affecting global average temperature. You know what that is? It's excess CO2 pumped into the atmosphere at an alarmingly fast rate.

Do you know how we know where most of the excess CO2 is coming from? We can see it in the isotopic composition of the excess CO2...it points directly to HUMANS BURNING MASSES OF FOSSIL FUELS which tends to lower the 13-C/12-C ratio.

It's almost like the science says EXACTLY WHAT WE WOULD EXPECT!

Is there global warming? Sure, just as there has been global warming every 125,000 years. is man the cause of it? No, that is just political garbage...

Garbage is more likely to arise when one is actively not learning basic intro geology when it is taught at just about every college across the country and then acting like one has now disproven thousands upon thousands of PhD level geochemists, physicists, climatologists, and chemists who've been working on this for over 100 years!
 
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