Forecasting Data of the Troposphere Used for IVS Intensive Sessions

摘要

Troposphere parameters (mapping functions and gradients) determined from analysis and forecasting data of the European Centre for Medium-Range Weather Forecasts are compared and the differences are evaluated. It is shown that hydrostatic parameters are well predictable over four days whereas the wet parameters are more susceptible to forecasting errors. In particular, wet gradients are very sensitive to small differences in the numerical weather model. In the second part of the paper a clear correlation of east gradients vs. estimates of dUTl from IVS Intensive sessions is pointed out. The influence of the choice of the mapping function w.r.t. dUTl estimates is negligible.