Theories on Neptune temp change?

It's mildly interesting that the color of Neptune matches the peak energy output of the Sun. Assuming the color is due to scattering, this would actually make Neptune cooler since the blue color we see is the color rejected (scattered) not absorbed. [I doubt this is anything more than some novelty from a heliochromologist, admittedly. ;)]
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Nov 10, 2020
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In the context of the observed changes beyond just seasonal shifts its important to note that you can get shifts from internal dynamical cycles such as El Nino/La Nina related to rates of ocean overturning in the Pacific. Given that Neptune's main heat source appears to be primarily internal I would suspect that changes in the rate of upwelling are quite important here.
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