Things appear white because they are reflecting a lot of light in the visible wavelengths you can see, to which the atmosphere is unsurprisingly transparent. Things that are black on the other hand absorb the light, heat up and re-emit at their thermal temperature which in the terrestrial range of 0-100 degrees peaks in the far infrared which the atmosphere is not (as) transparent to.
The linked study is talking about a boundary effect between the cooler area of high albedo (because painting things white does reduce the energy absorbed and reflects a good chunk of that back into space) and the warmer area of normal albedo. Its modelling how that change between different temperature areas affects air circulation and cloud cover, not that the reflected light is warming up other areas.
Things appear white because they are reflecting a lot of light in the visible wavelengths you can see, to which the atmosphere is unsurprisingly transparent. Things that are black on the other hand absorb the light, heat up and re-emit at their thermal temperature which in the terrestrial range of 0-100 degrees peaks in the far infrared which the atmosphere is not (as) transparent to.
The linked study is talking about a boundary effect between the cooler area of high albedo (because painting things white does reduce the energy absorbed and reflects a good chunk of that back into space) and the warmer area of normal albedo. Its modelling how that change between different temperature areas affects air circulation and cloud cover, not that the reflected light is warming up other areas.