Geoengineering itself is a sort of Plan B, a way to fix global warming after the fact if we fail to limit greenhouse-gas emissions. One such scheme involves spewing particles of sulfur dioxide into the atmosphere to cut down on incoming sunlight — and according to new paper in Geophysical Research Letters , that could make that canopy of deep blue a thing of the past.
Instead, Ben Kravitz, of the Carnegie Institution for Science at Stanford and his colleagues say, the sky will become a washed-out white.
The washed-out white skies in Beijing are a good example of what our skies could look like post a geoengineered experiment. Credit: Geoff Grant. This is hardly the riskiest thing about geoengineering, as even its proponents freely admit. No one really knows what might happen if we begin tinkering with how much sunlight reaches the Earth.
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Notice that when the person looking down from the top sees a bright beam, the person looking in from the side will see a dim beam, and vice versa. You can also hold the polarizing filter between your eyes and the tank and rotate the filter to make the beam look bright or dim.
The filter and the scattering polarize the light. When the two polarizations are aligned, the beam will be bright; when they are at right angles, the beam will be dim. Scattering polarizes light because light is a transverse wave. The direction of the transverse oscillation of the electric field is called the direction of polarization of light. The beam of light contains photons of light that are polarized in all directions—horizontally, vertically, and all angles in between.
Consider only the vertically polarized light passing through the tank. This light can scatter to the side and remain vertically polarized, but it cannot scatter upward! To retain the characteristic of a transverse wave after scattering, only the vertically polarized light can be scattered sideways, and only the horizontally polarized light can be scattered upward. This is shown in the diagram below click to enlarge. Discover why your favorite cat videos don't leak out of optical fibers.
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