Dr. Natraj has 15 years of experience in developing radiative transfer models, retrieval algorithms and OSSEs. He developed the fast polarization model for the OCO-2 level-2 retrieval algorithm (Natraj and Spurr, 2007; Natraj et al., 2008). He will work with Co-I Kulawik on the bias correction and with Co-I Liu on instrument vertical sensitivities for joint OSSEs.