Radiative Transfer for TOVS is a very fast radiative transfer model for passive visible, infrared and microwave satellite measurements




Saunders, R., Hocking, J., Turner, E., Rayer, P., Rundle, D., Brunel, P., Vidot, J., Roquet, P., Matricardi, M., Geer, A., Bormann, N., and Lupu, C., 2018: An update on the RTTOV fast radiative transfer model (currently at version 12), Geosci. Model Dev., 11, 2717-2737, https://doi.org/10.5194/gmd-11-2717-2018.

Given an atmospheric profile of temperature, water vapour and, optionally, trace gases, aerosols and hydrometeors, together with surface parameters and a viewing geometry, RTTOV computes the top of atmosphere radiances in each of the channels of the sensor being simulated.

The core of RTTOV is a fast parameterisation of layer optical depths due to gas absorption. In addition, RTTOV also optionally computes the Jacobian matrix which describes the change in radiance for a change in any element of the state vector assuming a linear relationship about a given atmospheric state.

More recent versions of the software have extended its capabilities in numerous ways. Since version 11, RTTOV has had a built-in GUI which allows the user to modify an atmospheric/surface profile, run RTTOV for a given instrument, produce radiances and brightness temperatures and display instantaneously the results. It is also possible to calculate Jacobians, run PC-RTTOV and perform a basic 1DVar retrieval. 

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