Part I in this series on the Sun and climate described how we know that the Sun has been responsible for some of the major climate changes that have occurred over the past 11,000 years.
In Part II, we considered a range of changes that the Sun is causing in the climate today, including changes in the planet's rotation and in the polar vortex that are changing the frequency of cold winters.
In the first chapter of the 6th Assessment Report, the IPCC provides a clear explanation of climate change, defining its causes as follows: "The natural and anthropogenic factors responsible for climate change are known today as radiative 'drivers' or 'forcers'. The net change in the energy budget at the top of the atmosphere, resulting from a change in one or more such drivers, is termed 'radiative forcing'." According to the IPCC, heat transport is not considered a radiative forcing and not a cause of global climate change.
To the IPCC, variations in heat transport have not contributed to recent climate change because they only redistribute heat within the climate system, while recent climate change is due to heat being added to the system.
The first objection to changes in heat transport being a cause of climate change is incorrect because the greenhouse effect is very uneven, so emissivity is altered by poleward heat transport.
The second objection to changes in heat transport being a cause of climate change is incorrect because heat transport to the Arctic does not show the expected compensation.
It produces dynamic changes in the stratosphere, which is the part of the climate system whose response to the Sun is important for climate change.
https://judithcurry.com/2024/06/11/how-we-know-the-sun-changes-the-climate-iii-theories/
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