It seems each autumn, I start noticing sunsets more. They are so pink, so orange, so bright. I’ve always chalked up my autumnal sunset attention to my mood shifting with the changing season; perhaps I’m feeling a little wistful at summer’s end and reflecting on nature’s splendor more than usual. But according to the National Oceanic and Atmospheric Administration (NOAA), the colors we see during sunsets really are more vibrant in fall and winter than they are in spring and summer – seasonal melancholia has got nothing to do with it.
The intensity of sunset and sunrise colors has to do with Rayleigh scattering. I spoke with meteorologist Chris Bouchard of the Fairbanks Museum and Planetarium in St. Johnsbury, Vermont, who kindly dropped some knowledge on this scattering business.
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