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DanielleFong's profile
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪
@DanielleFong

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𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪

@DanielleFong

𝔞 𝔟𝔩𝔞𝕤𝔱 𝔣𝔯𝔬𝔪 𝔱𝕙𝖊 𝔭𝔞𝔰𝔱 𝕝𝕖𝕧𝕖𝕝 𝟛𝟚 𝕤𝕠𝕣𝕔𝕖𝕣𝕖𝕤𝕤, 𝕙𝕒𝕣𝕕𝕔𝕠𝕣𝕖 𝕞𝕠𝕕𝕖

.earth  🌎
daniellefong.com
Joined February 2008

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    1. Tim Garrett‏ @nephologue Jan 1
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      Replying to @ElephantEating

      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?

      1 reply 0 retweets 0 likes
    2. Eric Hittinger‏ @ElephantEating Jan 1
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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.

      1 reply 0 retweets 0 likes
    3. Eric Hittinger‏ @ElephantEating Jan 1
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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.

      1 reply 0 retweets 1 like
    4. Tim Garrett‏ @nephologue Jan 1
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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.

      1 reply 0 retweets 1 like
    5. 𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪‏ @DanielleFong Jan 1
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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?

      1 reply 0 retweets 1 like
    6. Eric Hittinger‏ @ElephantEating Jan 2
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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).

      1 reply 0 retweets 0 likes
    7. Scott Robeson‏ @indianaclimate Jan 2
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      Replying to @ElephantEating @DanielleFong @nephologue

      Here’s an article on this topic by my IU colleague Ben Kravitz:https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012GL051652 …

      1 reply 0 retweets 2 likes
    8. Eric Hittinger‏ @ElephantEating Jan 2
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      Replying to @indianaclimate @DanielleFong @nephologue

      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).

      1 reply 0 retweets 1 like
    9. Scott Robeson‏ @indianaclimate Jan 2
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      Replying to @ElephantEating @DanielleFong @nephologue

      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.

      2 replies 0 retweets 2 likes
    10. 𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪‏ @DanielleFong Jan 2
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      Replying to @indianaclimate @ElephantEating @nephologue

      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.

      1 reply 0 retweets 2 likes
      𝓓𝑎𝑛𝑖𝑒𝑙𝑙𝑒 𝓕𝑜𝑛𝑔, 𝕖𝕩-𝕡𝕣𝕠𝕕𝕚𝕘𝕪‏ @DanielleFong Jan 2
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      Replying to @DanielleFong @indianaclimate and

      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!

      10:29 AM - 2 Jan 2020
      • 2 Likes
      • Eric Hittinger Scott Robeson
      0 replies 0 retweets 2 likes

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