Two centuries ago Humboldt, Arago and others introduced 'Cyanometers', color wheels usedto measure how blue the sky appeared as altitude and locales varied. As I've already asked the inventor of the hand held Dobson Unit meter , Forrest Mims, to develop parallel gadgets for water reflectivity and ocean color, perhaps Andrew should request an electronic sky color gizmo-- the self driving car folk at Tesla and Apple might add the cost to their Due Diligence bill.
On Sunday, April 7, 2019 at 12:05:59 PM UTC-4, Andrew Lockley wrote: > > For example, if it made skies whiter, it could potentially be more > difficult (or easier) for drivers to pick out pedestrians. Over billions of > people and decades, this could have a significant effect. > > Andrew Lockley > > On Sun, 7 Apr 2019, 17:01 Douglas MacMartin, <[email protected] > <javascript:>> wrote: > >> There’s not that much ground-based astronomy in UV, relative to optical >> and IR astronomy. >> >> >> >> Impact on optical astronomy is straightforward; if you lose 5% of the >> direct light, you need 5% longer integration time to get same number of >> photons. >> >> >> >> Impact on IR astronomy is less obvious, as limited by the background from >> the sky, which depends on water vapour and temperature through the >> atmospheric column (with most telescopes being at 14000’ or so). Shouldn’t >> be hard to estimate, I’ve never gotten someone interested enough to do the >> calculations but I could try again (my other job is being on the design >> team for the Thirty Meter Telescope). >> >> >> >> I did ask people whether they noted anything after Pinatubo, and the >> answer I got was no… that doesn’t mean there wasn’t an effect, but it >> wasn’t something that the astronomy community by and large remembered. >> >> >> >> *From:* [email protected] <javascript:> < >> [email protected] <javascript:>> *On Behalf Of *Russell Seitz >> *Sent:* Sunday, April 7, 2019 9:31 AM >> *To:* geoengineering <[email protected] <javascript:>> >> *Subject:* [geo] Re: SRM optical impacts >> >> >> >> Why would reductions in the downwelling tropospheric light flux >> increase any of the above? I'd instead ask instrumental astromomers >> what they think SO2 scattering would do in the UV , as they have a lot to >> lose from scattered light, which can cost them contrast and degrade the >> signal to noise ratio in interferometry and spectroscopy. >> >> >> >> Try the Magellan and OWL teams >> >> On Wednesday, April 3, 2019 at 7:47:35 AM UTC-4, Andrew Lockley wrote: >> >> Has there been any investigation of SRM effects on vision? Eg perceived >> glare, macular degeneration, corneal sunburn, vision development in >> infants, object recognition when driving (and their equivalent in animals)? >> >> >> >> Andrew Lockley >> >> -- >> You received this message because you are subscribed to the Google Groups >> "geoengineering" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at https://groups.google.com/group/geoengineering. >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "geoengineering" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at https://groups.google.com/group/geoengineering. >> For more options, visit https://groups.google.com/d/optout. >> > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
