Troposphere Working Group Charter and Members




GNSS can make important contributions to meteorology, climatology and other environmental disciplines through its ability to estimate troposphere parameters. Along with the continued contributions made by the collection and analysis of ground-based receiver measurements, the past decade has also seen new contributions made by space-based GNSS receivers, e.g., those on the COSMIC/FORMOSAT mission [1]. The IGS therefore continues to sanction the existence of a Troposphere Working Group (TWG).


Working Group Goals

The primary goals of the IGS TWG are to:

  • Assess/improve the accuracy/precision of IGS GNSS-based troposphere estimates.
  • Improve the usability of IGS troposphere estimates.
  • Confer with outside agencies interested in the use of IGS products.
  • Assess which new estimates should be added as “official” IGS products, and which, if any, official troposphere product sets should be discontinued.
  • Provide and maintain expertise in troposphere-estimate techniques, issues and applications.


Science Background

The primary troposphere products generated from ground-based GNSS data are estimates of total zenith path delay and north/east troposphere gradient. Ancillary measurements of surface pressure and temperature allow the extraction of precipitable water vapor from the total zenith path delay.

Water vapor, a key element in the hydrological cycle, is an important atmosphere greenhouse gas. Monitoring long-term changes in its content and distribution is essential for studying climate change. The inhomogeneous and highly variable distribution of the atmospheric water vapor also makes it a key input to weather forecasting.

Water vapor distribution is incompletely observed by conventional systems such as radiosondes and remote sensing. However, ground- and space-based GNSS techniques provide complementary coverage of this quantity. Ground-based GNSS observations produce continuous estimates of vertically integrated water vapor content with high temporal resolution over a global distribution of land-based locations; coverage is limited over the oceans (where there is no land). Conversely, water vapor can be estimated from space-borne GNSS receivers using ray tracing techniques, in which case solutions with high vertical resolution (laterally integrated over few hundred kilometers) and good oceanic/land coverage are obtained; these solutions however are discontinuous in geographic location and time.

Be it resolved that the IGS troposphere WG will:

  • Support those IGS analysis centers providing official IGS troposphere products.
  • Increase awareness/usage of IGS troposphere products by members of the atmospheric,meteorology and climate-change communities. Solicit the input and involvement of such agencies.
  • Create new IGS troposphere products as needed (as determined by consultation with the potential user community).
  • Determine the uncertainty of IGS troposphere estimates through comparison of solutions with those obtained from independent techniques, or through other means as appropriate.
  • Promote synergy between space-based and ground-based GNSS techniques through interaction with researchers in both fields.



[1] Schreiner, W., C. Rocken, S. Sokolovskiy, S. Syndergaard and D. Hunt, Estimates of the precision of GPS radio occultations from the COSMIC/FORMOSAT-3 mission, GRL 34, L04808, doi:10.1029/2006GL027557, 2007.

[2] Teke, K., J. Böhm, T. Nilsson, H. Schuh, P. Steigenberger, R. Dach, R. Heinkelmann, P. Willis, R. Haas, S. García-Espada, T. Hobiger, R. Ichikawa and S. Shimizu, Multi-technique comparison of troposphere zenith delays and gradients during CONT08, J Geod 85:395–413, DOI 10.1007/s00190-010- 0434-y, 2011.



NB: I have included the names of new subscribers to the IGS TWG email list, without necessarily confirming that they wish to be a part of the WG.
Last Name First Name Institution Country email
Ahmed Furqan Universite du Luxembourg Luxembourg [email protected]
Amirkhani Mohammad Islamic Azad Univ. Tehran Iran [email protected]
Bar-Sever Yoaz JPL USA [email protected]
Bevis Mike OSU USA [email protected]
Bock Olivier IGN-LAREG France [email protected]
Boehm Johannes TU Wien Austria [email protected]
Bosser Pierre ENSG/DPTS France [email protected]
Bosy Jaroslaw Institute of Geodesy and Geoinformatics; Wroclaw University of Environmental and Life Sciences Poland [email protected]
Braun John UCAR USA [email protected]
Byram Sharyl USNO USA [email protected]
Byun Sung JPL USA [email protected]
Calori Andrea Univ. Roma "La Sapienza" Italy [email protected]
Cao Wei Trimble Terrasat Germany [email protected]
Chen Junping Shanghai Astronomical Observatory China [email protected]
Colosimo Gabriele Univ. Roma "La Sapienza" Italy [email protected]
Crespi Mattia Univ. Roma "La Sapienza" Italy [email protected]
Deng Zhiguo GFZ Germany [email protected]
Dick Galina GFZ Germany [email protected]
Dousa Jan GOP Poland [email protected]
Drummond Paul Trimble USA [email protected]
Ghoddousi-Fard Reza Natural Resources Canada Canada [email protected]
Guerova Guergana Univ. Sofia Bulgaria [email protected]
Gustavson Terry ? USA? [email protected]
Gutman Seth NOAA USA [email protected]
Hackman Christine USNO USA [email protected]
Heinkelmann Robert GFZ Germany [email protected]
Herring Tom MIT USA [email protected]
Hilla Steve NGS/NOAA USA [email protected]
Hobiger Thomas Onsala Space Observatory; Chalmers Univ. of Technology Sweden [email protected]
Januth Timon Univ. of Applied Sciences, Western Switzerland (?) Switzerland [email protected]
Jones Jonathan Met Office UK UK [email protected]
Langley Richard Univ. New Brunswick Canada [email protected]
Leandro Rodrigo Hemisphere GNSS USA [email protected]
Leighton Jon 3vGeomatics Canada/UK [email protected]
Liu George Hong Kong Polytechnic University Hong Kong [email protected]
Melachroinos Stavros Geoscience Australia (?) Australia [email protected]
Moeller Gregor TU Wien Austria [email protected]
Moore Angelyn JPL USA [email protected]
Negusini Monia Inst. Radioastronomy (IRA); National Inst. Astrophysics (INAF) Italy [email protected]
Nikolaidou Thaleia Univ. New Brunswick Canada [email protected]
Nordman Maaria Finnish Geodetic Inst. Finland [email protected]
Pacione Rosa ASI/CGS Italy [email protected]
Palamartchouk Kirill Univ. Newcastle UK [email protected]
Penna Nigel Univ. Newcastle UK [email protected]
Perosanz Felix CNES France [email protected]
Pottiaux Eric Royal Obs Belgium Belgium [email protected]
Prikryl Paul Communications Research Centre, Canada Canada [email protected]
Realini Eugenio GReD - Geomatics Research & Development s.r.l. Italy [email protected]
Rocken Chris GPS Solutions USA [email protected]
Roggenbuck Ole BKG Germany [email protected]
Rohm Witold Univ. Wroclaw Poland [email protected]
Romero Nacho Canary Advanced Solutions Spain [email protected]
Santos Marcelo  Univ. New Brunswick Canada [email protected]
Schaer Stefan AIUB Switzerland [email protected]
Schoen Steffen Inst. Erdmessung, Leibniz Uni Hannover Germany [email protected]
Selle Christina JPL USA [email protected]
Sguerso Domenico Lab. Geodesy, Geomatics, GIS; Univ. Genoa Italy [email protected]
Soudarin Laurent Collecte Localisation Satellites France [email protected]
Teferle Norman Universite du Luxembourg Luxembourg [email protected]
Tracey Jeffrey USNO USA [email protected]
van der Marel Hans TU Delft Netherlands [email protected]
Waithaka Edward Hunja Jomo Kenyatta U. of Agriculture and Technology Kenya [email protected]
Wang Junhong UCAR/NCAR USA [email protected]
Willis Pascal Inst. de Physique du Globe de Paris France [email protected]
Xu Zong-qiu Liaoning TU China [email protected]
Zhang Shoujian Wuhan Univ. China [email protected]

[Last updated December 2011]

Have more questions? Submit a request