Andrew,
I remember some papers after Mt. Pinatubo blew discussing the impact on
loss of stratospheric ozone on UV, the oxidant OH, and methane were
published. Try googling something like "oh ozone uv mt. pinatubo"
On 4/7/2019 5:49 PM, Douglas MacMartin wrote:
The main reason to put in the middle of the ocean (or the first range
of mountains that the air mass encounters) is to have a very stable
atmosphere above the observatory, though it is true that Mt. Wilson
above Pasadena used to be a very good site before the aerosol and
light pollution…
Laser guide stars are 589nm (sodium)… My guess would be that the main
effect would simply be a loss of photons from scattering; both the
upward laser and the downward light from the sodium layer at 90km, so
a squared effect, but still, if one is talking about 5% or so loss of
light (to get 1% reflected back to space), not a huge deal. But I
should ask…
*From:*[email protected]
<[email protected]> *On Behalf Of *Russell Seitz
*Sent:* Sunday, April 7, 2019 3:14 PM
*To:* geoengineering <[email protected]>
*Subject:* Re: [geo] Re: SRM optical impacts
Stephen
Some of the biggest telescopes have been atop tall islands in the
middle of the ocean like Hawaii and Grand Canaria to get away from
light pollution and dust and aerosol scattering on land.
Douglas
I mentioned the UV because the medical concernns Andrew mentioned
largely arise from short wavelength photons. Can you tell us how
stratospheric aerosols might effect the preformance of the laser
guide stars on which deformable mirror correction systems depend-
would ring images be a problem at the diffraction limit?
The dimensionless aerosol scattering efficiency coefficient Ms is of
the order of the Mie integral of the number density over the range
from r max to r min-
*Q* Ms (r) πr2n (r) dr*Q*Ms (r) π*r2/N/* (r)/d/r
On Sunday, April 7, 2019 at 10:08:37 AM UTC-4, Stephen Salter wrote:
Russell
Some of my best friends are astronomers but few of them use
telescopes in mid ocean so you and I can remain on good terms.
Stephen
Emeritus Professor of Engineering Design. School of Engineering,
University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW,
Scotland [email protected] <javascript:>, Tel +44 (0)131 650 5704,
Cell 07795 203 195, WWW.homepages.ed.ac.uk/shs
<http://WWW.homepages.ed.ac.uk/shs>, YouTube Jamie Taylor Power
for Change
On 07/04/2019 14:31, Russell Seitz wrote:
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
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