Estimating surface radiation fluxes in the Arctic from TOVS brightness temperatures
A new method for estimating downwelling shortwave and longwave radiation fluxes in the Arctic from TOVS brightness temperatures has been developed. The method employs a neural network to bypass computationally intensive inverse and forward radiative transfer calculations. Results from two drifting ice camps (CEAREX, LeadEx) and from one coastal station show that downwelling fluxes can be estimated with r.m.s. errors of 20Wm-2 for longwave radiation and 35Wm-2for shortwave radiation. Mean errors are less than 4 Wm-2 and are well within the bounds required for many climate process studies.