Improved parameterization of the tropospheric delay based on NWM

Doğan A. H., Zus F.

XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG), Berlin, Germany, 11 - 20 July 2023, pp.1

  • Publication Type: Conference Paper / Summary Text
  • Doi Number: 10.57757/iugg23-0949
  • City: Berlin
  • Country: Germany
  • Page Numbers: pp.1
  • Yıldız Technical University Affiliated: Yes


In GNSS, tropospheric Mapping Functions (MFs) are used to provide the relationship between slant and zenith delays. In order to regard asymmetry of the atmosphere, tropospheric gradients are taken into account. In this study, we present a new approach to parameterize the tropospheric delay and modify the wet MF with an additional parameter to decrease the errors in the analysis. Hence, we have calculated tropospheric delays on global scale using ray-tracing algorithm. ECMWF’s reanalysis ERA5 hourly datasets have been used with 0.25° horizontal resolution. According to the results, it can be concluded that the additional parameter is related to the humidity field. Since the humidity field is highly variable in space and time Numerical Weather Models will have difficulties to predict the additional parameter accurately.