In order to demonstrate a proof of concept,this porting procedure has been applied to the principal radiation transfer model (PCRTM).This is similar to the approach to radiative transfer used in [8]. The PCRTM code is configured as a library and comes with an example code that specifies initial conditions and uses the library to produce the mid-infrared top-of-atmosphere spectrum as shown in Fig. 1.Spectra such as this are produced for each grid point and each time step of an OSSE.The blackbody outline and absorption features of water vapor,carbon dioxide,and ozone.The spectrum is composed of 1317 data points, which are produced from 360 calculated absorption lines in a procedure that is similar to the correlated-kmethod [13]