Fifth EUMETSAT ROM SAF user workshop on Applications of GPS radio occultation measurements

ROM-SAF-WorkshopECMWF hosted the Fifth EUMETSAT ROM SAF user workshop on Applications of GPS radio occultation measurements, on June 16-18, 2014.


GPS radio occultation (GPS-RO) measurements are now an important component of the global observing system, because they complement the information provided by satellite radiances. This workshop, jointly organized by ECMWF and the EUMETSAT Radio Occultation Meteorology Satellite Application Facility (ROM-SAF), will review the use of the GPS-RO data at the major NWP centres, and explore how the assimilation of the measurements can be improved using more sophisticated observation operators. The value of GPS-RO as "anchor measurements" for estimating both the bias correction of satellite radiances and the model error term in "weak constraint" 4D-Var will be emphasised. The workshop will explore the potential new applications of monthly-mean and seasonal GPS-RO climatologies in NWP/climate model development and testing. The latest work on climate monitoring with GPS-RO will be reviewed.

This workshop was co-sponsored by ECMWF and the EUMETSAT Radio Occultation Meteorology Satellite Application Facility (ROM-SAF).

Local organizer: Dr Sean Healy



PDF iconProgramme



General issues


The role of GPS-RO in the global observing system

John Eyre (Met Office)

PDF icon

The impact and importance of GPS-RO in NWP

John Derber (NOAA)

PDF icon

Status and aims of the FORMOSAT-7 (COSMIC-2) mission

Nick Yen (NSPO)

PDF icon

Improvements in the procession of GPS-RO data

Sergey Sokolovskiy (UCAR

PDF icon
Climate applications  

Stratospheric temperature trends: Our evolving understanding

Dian Seidel (NOAA)

PDF icon

Generation of GPS-RO climate data at the ROM SAF

Hans Gleisner (DMI)

PDF icon

Climate model testing with GPS-RO

Mark Ringer (Met Office)

PDF icon

Climate monitoring with GPS-RO: Towards SI-traceable records

Gottfried Kirchengast (WEGC)

PDF icon
NWP assimilation  

Impact of GPS-RO at Environment Canada

Josef Aparicio (Environment Canada)

PDF icon

Progress in GPS-RO assimilation at NOAA

Lidia Cucurull (NOAA)

PDF icon

Assimilation of GPS-RO with 2D operators

Sean Healy (ECMWF)

PDF icon

The impact of GPS-RO on typhoon forecasts

Bill Kuo (UCAR)

PDF icon

Progress in forward modelling of L1 and L2 bending angles

Ian Culverwell (Met Office)

PDF icon
Atmospheric Studies with GPS-RO

Tropopause studies with GPS-RO

Bill Randel (NCAR)

PDF icon

Gravity wave studies using GPS-RO

Torsten Schmidt (Helmholtz Centre Potsdam)

PDF icon

Planetary boundary layer studies with GPS-RO

Feigin Xie (Texas A&M University-Corpus Christi)

PDF icon

Accuracy of humidity information retrieved from GPS-RO

Rob Kursinski (Moog Advanced Missions & Science)

PDF icon


The workshop was attended by around 30 international scientists, with expertise in both GPS radio occultation and climate applications. It followed the standard format of a series of presentations, followed by a day in NWP and climate working groups, and then a plenary session.

The NWP working group endorsed the ECMWF strategy of moving towards assimilation with a two-dimensional observation operator. In fact, it was clear that we are leading the work in this area: the other operational centres are unlikely to have this capability in the next few years, and they will look to ECMWF for guidance.

The climate working group stressed the need for increased co-operation between GPS-RO and broader climate communities. Although it seems clear that GPS-RO will become increasingly useful for climate applications in the coming years, it was emphasised that new products would have to be accompanied by a robust estimate of the uncertainty.

The value and continued importance of GPS-RO in both operational NWP and reanalysis applications was emphasised at the plenary session. Overall, this was a useful and enjoyable workshop, which benefited greatly from the diversity of the participant’s research interests.

PDF iconworkshop recommendations