In this project we have studied Solar radiative transfer and global climate modelling.rnWe consider a parallel beam of electromagnetic radiation incident on a slab of thicknessrnds. As this radiation passes through the atmosphere it interacts and is beingrnabsorbed by the atmospheric gases, the continental lands and oceans and large waterrnbodies. In this project work, we describe the optical depth or optical thickness,rnthe intensity or spectral radiance, absorption, reflection, scattering of particles byrnapplying Beerâ€™s law or Lambertâ€™s law. The intensity of the incident radiation decreasesrnexponentially as a function of solar zenith angle, fraction of absorbers in thernatmosphere, the scattering coefficient, scale height, altitude and density of the atmosphere.rnThe absorption and emission of radiation by the atmospheric gases causesrnclimate changes. More over the major climate system components (atmosphere, landrnsurface, ocean, and sea ice), and their interactions are described using the basic equationsrnthat govern the atmosphere. These can be formulated as a set of seven equationsrnwith seven unknowns such as the three velocity components (u, v, w), the pressurernp, the temperature T, the specific humidity q and the density _. These equations,rnsolved numerically by computers, are used to produce our weather forecasts. Whilernthere are details about these equations which are uncertain (for example, how wernparameterize processes smaller than the grid size of the models), the equations forrnthe most part are accepted as fact. The radiation that passes through the atmospherernis absorbed by the lands and ocean surfaces and is re-emitted as infrared back intornthe atmosphere so as to heat it and this causes climatic changes.