Die obere Erdatmosphäre kühlt sich mehr als zehnmal schneller ab als die natürliche Geschwindigkeit. Eine neue Studie zeigt, warum: Während CO₂ Wärme in der Nähe der Erdoberfläche einfängt, sorgt es gleichzeitig dafür, dass die Stratosphäre Infrarotenergie effizienter in den Weltraum abstrahlt, was einen wichtigen Fingerabdruck des vom Menschen verursachten Klimawandels darstellt.
https://www.nature.com/articles/s41561-026-01965-8
8 Kommentare
Does this imply we could ’see‘ artificial global warming on exo-planets? Interesting if so.
Uhm so is this a good thing or a bad thing? Less energy (heat) reaches our planets surface which sounds like a good thing.
fascinating find. in reverse, could this radiated infrared add to the ways we might detect biosignatures on exoplanets?
We just need big Air mixers to cool the ground then?
The way this reads, it sounds as if the more CO2 we pump into the atmosphere will simultaneously heat the earth [via the greenhouse gas mechanism] and reduce the amount of heat reaching the earth from the sun. Is that correct?
>while CO₂ traps heat near Earth’s surface, it also makes the stratosphere radiate infrared energy
That would be expected from basic physics, right? CO2 absorbs IR, then re-radiates it in all directions, including back the way it came.
At ground level, where IR needs to pass through a lot of CO2 to get out, that results in trapping heat. In the stratosphere, where IR would need to pass through a lot of CO2 to get in, that results in keeping it out.
So if heat isn’t getting out from below, and is being reflected more from above, the upper levels of the atmosphere cool.
CO2 doesn’t explain the thermal load we have been seeing. It also literally can’t. its 0.03% of our atmosphere and has a heat capacity of 0.849 kJ/kg·K. It has only gone up about 200 ppm in the last 100 years. Meanwhile, the amount of wilderness area on the Earth’s surface has gone from 95% of the Earth’s surface to about 11% in that same period. Wilderness areas contain complex plant communities. Plants have a multifaceted way to cool the environment. First they absorb light and turn it into sugar, preventing it from becoming radiant heat. Second they shade the soil, which acts as a thermal reseviour (think the urban heat island effect). Third plants do a process called evapotranspiration. Water has a heat capacity of 4.186 J/g·K (which is an order of magnitude more than CO2). Evapotranspiration is basically the process of a swamp cooler.
There were periods in the geologic record that span MILLIONS of years where CO2 was 800-1500ppm and the average global temperatures were 50% less than we see today. This shows an inverse relationship between CO2 and global temperatures, aka CO2 is not the greatest factor in the expression of surface temperatures on the Earth. Water, having a heat capacity of an order of magnitude higher than CO2, and an average atmospheric concentration of around 5% (aka orders of magnitude higher than CO2) is the main factor in surface temperature expression on the Earth.
And in recent years (the past 5 years) studies are coming out that show this. Local plant communities at ALL latitudes are more important than CO2 concentrations for average temperature expression. The only exception are areas with no plant communities, without plant communities CO2 concentration is more important than plants (which is basically a statement to maintain funding).
Read Boundary Climate and Atmosphere by Oke. Learn about energy balances, eddy covariance, etc.
It’s still human’s fault, so we can keep the guilt up, but reducing CO2 won’t stop climate change. Only rewilding our environment.
Oil company propaganda Republican take: seeeee! It’s coooooling!