Sort of agree. Though to be effective from a climate management standpoint, wouldn't the stratospheric particles have to have some visible affect on the blueness of the sky?
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Replying to @nephologue
Hmmm. On color, I'm not sure. The blue is from Raleigh scattering, and I don't see why that would necessarily be disrupted, though it might be. Even if it were, I'd still expect the color effect to be small - less pollution than in polluted cities and further up.
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Replying to @ElephantEating @nephologue
Plus, we don't notice a shift when this happens naturally (big volcano somewhere else in the world throws enough junk up to cool 1 degree). But I'd certainly listen to someone who had better analysis on the visible sky color effects of sulfur particles in the upper atmosphere.
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Replying to @ElephantEating
The sky is whitish on the horizon, even for clear skies, due to the effects of multiple scattering. So with more particulates the zone of whiteness would extend upwards from the horizon. Also, blue skies near twilight are due to ozone absorption. I assume that would disappear.
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Replying to @nephologue @ElephantEating
I would think it would be modulated down mostly imperceptibly, surely the skies would still be blue at twilight?
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Replying to @DanielleFong @nephologue
Yeah, that is the other element. There are 2 questions: 1. What color effect would SRM cause? 2. Would it be a large enough shift to notice? I can't answer #1, but my guess for #2 is "too small to notice" based on observed phenomena (pollution, volcanoes).
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Here’s an article on this topic by my IU colleague Ben Kravitz:https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012GL051652 …
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Oh, awesome - thanks. Sounds like sulfur particles are unlikely to shift perceived color of the sky at any part of the day, but would likely affect perceived brightness of the sky (making the sky brighter overall).
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My understanding is that mid-day sky would become more milky white. The diffuse fraction would be higher than now so it would be like a haze. No more crisp blue skies.
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Thanks! I think you’re right; twilight scattering might substantially decrease blue brilliance, because high up in the atmosphere it won’t be much in shadow, and will outcompete the ordinary rayliegh scattering. It sounds like a terrible loss, honestly. Worth doing the numbers.
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low altitude salt micropoarticle geoengineering might not have this effect, instead it would be only like a localized, prolonged marine layer. maybe ok. save the sky!
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