Wednesday, September 9, 2020

Circadian disruption : A dark orange day in San Francisco

 Copyright © Françoise Herrmann


Dark orange skies in SF © Françoise Herrmann

Orange sky ? Smoke particles high in the atmosphere scatter short blue light, only letting longer red-orange waves through to the surface. The result is a dark orange day, even at noon.

Healthy air quality ?  Smoke is on top of a layer of marine fog, which preserves air quality.

Disruption of Circadian rhythm ? An internal clock called the circadian clock drives rhythm in our bodies, such as sleep for example. This is the reason we feel jet lagged when traveling across time zones.  Likewise, though perhaps just once in a lifetime, a dark orange day definitely baffles circadian rhythms.


References

Cabanatuan, M. & Rubenstein, S. (Sept. 9, 2020) Apocalyse on their mind: Bay Area awakes to foreboding, orange, smoke-choked skies. San Francisco Chronicle   https://tinyurl.com/y4tpj47o 

Calima, J. & V. Pavic (photographer) (Sept 9, 2020) The sky is on fire in San Francisco, and we flew a drone through it. The Verge https://tinyurl.com/y4ae6g2s 

Martichoux, A. & L. Gee (09-09-2020) Here's why the sky looks so orange, even though Bay Area air quality isn't terrible. https://tinyurl.com/y6kn2xsy

Timonina, D. (July 9, 2020) Time to improve your health: focusing on circadian rhythms. The Buck Intsitute https://tinyurl.com/y6qq8uzu

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