Please summarize the following article in 10 sentences:

The CO2 GHE demystified
Posted on February 23, 2013 by NAME_1
Abstract: This post describes a new approach to calculating the CO2 greenhouse effect. Instead of calculating radiative transfer  from the surface up through the atmosphere to space, exactly the opposite is done. IR photons originating from space are tracked downwards to Earth in order to derive for each wavelength the height at which more than half of them get absorbed within a 100 meter path length.  This identifies the height where the atmosphere becomes opaque at a given wavelength. This also coincides with the “effective emission height” for photons to escape from the atmosphere to space. A program has been written using a standard atmospheric model to perform a line by line calculation for CO2 with data from the HITRAN spectroscopy database. The result for CO2 is surprising as it shows that  OLR from the central peak of the 15 micron band originates from high in the stratosphere. It is mostly the lines at the edges of the band  that lie in the troposphere.  The calculation can then show how changes in CO2 concentrations affect the emission height and thereby reduce net outgoing radiation(OLR). The net reduction in OLR is found to be in agreement with far more complex radiative transfer models.  This demonstrates how the greenhouse effect on Earth is determined by greenhouse gases in the upper atmosphere and not at the surface.

NAME_2 5b: The CO2 emission height profile for 300ppm and for 600ppm smoothed with a resolution of 20 lines. The CO2 emission height profile for 300ppm and for 600ppm smoothed with a resolution of 20 lines.

This post looks in detail at the emissions to space by CO2 molecules from the atmosphere. The main CO2 absorption band lies at 15 microns. It is composed of hundreds of quantum transitions between vibrational states of the molecule. The reference database for the strengths of these lines is called HITRAN and is maintained by Harvard University[1]. I requested a copy of this database and have been studying it. NAME_2 1. shows in detail  the transition lines within this band and  NAME_2 2. shows the fine detail within the central spike. The line strengths are recorded at 296K in units of cm-1/(molecules cm-2)  corresponding to the absorption cross section for one molecule in vacuum.

Figure 1: The fine structure of transition lines that make up the 15 micron CO2 absorption band. Figure 1: The fine structure of transition lines that make up the 15 micron CO2 absorption ban Respond with at most 600 words.
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