Some black phosphorus characteristics, such as the onset of optical absorption, were nearly unaffected in the calculations. (sciencedaily.com)
This is what the ESRL had to say about satellite - based COs sensing and I quote «Greenhouse gas abundances derived from optical absorption measurements from space can never be calibrated because one can not control the abundance of the gases being estimated, nor can we control potential interfering factors in the optical path.» (hubpages.com)
(For experts, the red arrow represents Raman spectroscopy, the black arrow represents synchrotron x-ray diffraction, and the gray arrow represents optical absorption spectroscopy.) (sciencedaily.com)