TY - GEN
AU - Peter Bauer
AU - E. Moreau
AU - F. Chevallier
AU - U. O'Keeffe
AB - A multiple scattering radiative transfer model for microwave radiance data assimilation in global numerical weather prediction models is presented. The model is part of the RTTOV software package and includes forward, tangent-linear, adjoint and Jacobian models. The model is based on the Eddington approximation to radiative transfer which produces mean errors of less than 0.5 K at the targeted microwave frequencies between 10 and 200 GHz. The simplified treatment of sub grid-scale cloud cover may produce biased model calculations that show a maximum at 0.5 cloud cover and may reach several degrees K. These errors may be corrected with a simple bias-correction. Linearity tests indicate that, given a screening procedure that excludes situations in which the model responds non-linearly to input perturbations, channels near 50.3, 19.35, 22.235 and near 183.31 GHz may be used in global radiance data assimilation.
BT - ECMWF Technical Memoranda
CY - Shinfield Park, Reading
DA - 02/2006
DO - 10.21957/6a62hky1e
LA - eng
M1 - 486
N2 - A multiple scattering radiative transfer model for microwave radiance data assimilation in global numerical weather prediction models is presented. The model is part of the RTTOV software package and includes forward, tangent-linear, adjoint and Jacobian models. The model is based on the Eddington approximation to radiative transfer which produces mean errors of less than 0.5 K at the targeted microwave frequencies between 10 and 200 GHz. The simplified treatment of sub grid-scale cloud cover may produce biased model calculations that show a maximum at 0.5 cloud cover and may reach several degrees K. These errors may be corrected with a simple bias-correction. Linearity tests indicate that, given a screening procedure that excludes situations in which the model responds non-linearly to input perturbations, channels near 50.3, 19.35, 22.235 and near 183.31 GHz may be used in global radiance data assimilation.
PB - ECMWF
PP - Shinfield Park, Reading
PY - 2006
EP - 22
T2 - ECMWF Technical Memoranda
TI - Multiple-scattering microwave radiative transfer for data assimilation applications.
UR - https://www.ecmwf.int/node/7989
ER -