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Visiting Scientist Program

As part of the ROM SAF project we have an ongoing visiting scientist programme. This programme allows scientists from institutions that are not SAF members to participate in the activities of the SAF, either as Visiting Scientists or as Associate Scientists, through appropriate projects in their home institutes. If you are interested in joining us for e.g. 1-6 months to work on one of our research projects please feel free to contact us.

These documents are Copyright material.

List of long-term Visiting Scientists

2000-2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2024

2024

CDOP 4 VS41
Dr. Hailing Zhang
Project Scientist at the COSMIC Program Office/Joint Center for Satellite Data Assimilation, UCAR, Boulder, CO, USA.
Visit: The VS study was performed during October 2023 to May 2024 at UCAR, Boulder, and included a two-month’s visit to UK Met Office, Exeter, UK during October to November 2023.
Topic: Intercomparison of GNSS RO quality control methods in NWP

2022

CDOP-3 VS39
Dr. Sean Elvidge
Associate Professor at the University of Birmingham, UK
Visit: The VS study was performed during January - December 2021 at the University of Birmingham, UK.
Topic: Ionospheric 1D-Var Retrieval Assessment

2021

CDOP-3 VS40
Dr Florian Ladstädter
Wegener Center for Climate and Global Change, University of Graz, Graz, Austria
Visit: The VS study was performed during October 2020 to May 2021 at the Wegener Center, University of Graz, Austria.
Topic: Analysis of decadal trends from RO as contributed to IPCC AR6

2020

CDOP-3 VS38
Dr Stephen Leroy
Atmospheric and Environmental Research Inc., USA
Visit: The VS study was performed during July 2019 - December 2020 with a one-week visit to DMI, Denmark in October 2019.
Topic: Impacts on RO climatologies from under-sampling of atmospheric diurnal cycles

2019

CDOP-3 VS34
Dr. Congliang Liu
Postdoc Scientist at Wegener Center for Climate and Global Change, University of Graz, Graz, Austria
Visit: This VS study was performed during March to August 2018 at the Wegener Center, University of Graz, Austria.
Topic: Higher-order ionospheric correction of bending angles accounting for ionospheric asymmetry and evaluation of correction methods

CDOP-3 VS35
Dr. Marc Schwärz
Wegener Center for Climate and Global Change (WEGC), University of Graz, Graz, Austria
Visit: This VS study was performed during October 2018 to October 2019 at the Wegener Center, University of Graz.
Topic: Integration and initial application of ROPP in the Wegener Center reference occultation processing system rOPS

CDOP-3 VS37
Jordis S. Tradowsky
Bodeker Scientific, New Zealand
Visit: The VS study was performed during December 2018 - April 2019 at Bodeker Scientific with visits to UK Met Office and DMI.
Topic: Radio Occultation Measurements as the Primary Anchor in a Hierarchy of Anchor Observations for Numerical Weather Predictions

2018

CDOP-3 VS36
Bomin Sun
Senior Research Scientist, IMSG at NOAA/NESDIS/STAR, NOAA NCWCP, MD, USA
Visit: The VS study was performed during 8 days in April 2018 at the DMI.
Topic: Use of ROM SAF Level 2 data for calibration and validation of satellite products

2017

CDOP-2 VS33
Ms. Michelle Feltz
University of Wisconsin - Madison, Madison, WI, USA
Visit: The VS study was performed during May - August 2017 at the University of Wisconsin - Madison with a one month visit to DMI, Copenhagen, Denmark during June 2017.
Topic: Assessment of Differences Between ROM SAF GRAS Derived Brightness Temperatures and Hyperspectral Infrared Brightness Temperature Observations

CDOP-2 VS32
Ms. Mi Liao
CMA, Beijing, China
Visit: The VS study was performed during February - April 2017 at the ECMWF, Reading, UK with a short visit to Met Office, Exeter, UK
Topic: Preliminary investigation with GNOS bending angle data: Monitoring, quality control and possible implications for ROPP

2016

CDOP-2 VS31
Jordis S. Tradowsky
Bodeker Scientific, New Zealand
Visit: The VS study was performed during August - October 2016 at the Met Office with one short visit to ECMWF
Topic: Radiosonde Temperature Bias Corrections using Radio Occultation Bending Angles as Reference

CDOP-2 VS30
Dr. Feiqin Xie
Texas A&M University-Corpus Christi Texas
Visit: The VS study was performed during July - September 2016 at the home institute of the candidate
Topic: ROPP-9.0 beta testing

CDOP-2 VS29
Dr. Sergey Khaykin
LATMOS-CNRS/UVSQ
Visit: The VS study was performed during June - October 2016 at the home institute of the candidate with two visits each lasting two weeks to DMI
Topic: Retrieval of gravity waves from RO measurements: Capacities and limitations

CDOP-2 VS28
Prof. Matthew Angling
University of Birmingham
Visit: The VS study was performed during June - December 2016 at the home institute of the candidate with two visits to ECMWF
Topic: A new software tool for reducing systematic residual ionospheric errors in GNSS-RO level 3 products

CDOP-2 VS27
Dr. Michael Gorbunov
Institute of Atmospheric Physics, Moscow, Russia
Visit: This VS study was performed during December 2015 - March 2016 with two visits to DMI and IEEC during December 2015
Topic: Development of wave optics code for the retrieval of bending angle profiles for reflected rays

2015

CDOP-2 VS26
Jordis S. Tradowsky
Bodeker Scientific, New Zealand
Visit: The VS study was performed during September-October 2015 at the Met Office with one short visit to ECMWF
Topic: (i) Characterisation of radiosonde temperature biases and errors using radio occultation measurements
Topic:(ii) Supplementary Material

2014

CDOP-2 VS25
Dr. Weihua Bai
National Space Science Centre, Chinese Academy of Sciences
Visit: Associate scientist during 10 days in May 2014 at the Danish Meteorological Institute
Topic: Processing and validation of GNOS RO data processed by ROPP

CDOP-2 VS24
Dr. Julia Danzer
Wegener Center, University of Graz, Austria
Visit: The VS study was performed during March-July 2014 at the home institute of the candidate and with short visits to ECMWF during March 2014 and June/July 2014
Topic: Testing a new model for the residual ionospheric correction error in GPS radio occultation retrievals

CDOP-2 VS23
Dr. Julia Danzer
Wegener Center, University of Graz, Austria
Visit: Associate scientist during October 2013 to February 2014
Topic: Feasibility of generating long-term RO refractivity climatologies without using statistical optimization

2013

CDOP-2 VS22
Dr. Torsten Schmidt
Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany
Visit: Associate scientist one month at Helmholtz Centre Potsdam, May-Jun 2013
Topic: Beta testing of ROPP 7.0

CDOP-2 VS21
Dr. Feiqin Xie
Department of Physical & Environmental Sciences, Texas A&M University-Corpus Christi, Texas, USA
Visit: The VS study was performed during a six weeks visit to DMI (July - August 2013) and then July 2013 - November 2014 at the home institute of the candidate.
Topic: Investigation of methods for the determination of the PBL height from RO observations using ECMWF reanalysis data

CDOP-2 VS20
Dr. Michael Gorbunov
Institute of Atmospheric Physics, Moscow, Russia
Visit: Associate scientist during October - December 2013
Topic: Statistical analysis of systematic errors in RO measurements

CDOP-2 VS19
Dr. Barbara Scherllin-Pirscher
Wegener Center, University of Graz, Austria
Visit: Associate scientist during December 2012 to April 2013 at the Wegener Center
Topic: Further development of BAROCLIM and implementation in ROPP

2012

CDOP-2 VS17
Lic. Oscar Isoz
LTU Kiruna, Sweden
Visit: One month at EUMETSAT and DMI, May-Jun 2012
Topic: Analysis of GRAS interference patterns

2011

CDOP VS16
Dr. Riccardo Notarpietro
Politecnico di Torino, Italy
Visit: Two months at EUMETSAT and DMI, Nov 2011-Jan 2012
Topic: Implementation of ROSA radio occultation data handling into EUMETSAT and GRAS SAF processing

CDOP VS15
Dr. Johannes Fritzer
Wegener Center, Graz, Austria
Visit: Associate scientist at Wegener Center, Graz, Austria, November 2011
Topic: Beta testing of ROPP-6.0

CDOP VS14
Dr. Ulrich Foelsche & Dr. Barbara Scherllin-Pirscher
Wegener Center, Graz, Austria
Visit: Oct 2011-Feb 2012
Topic: Development of bending angle climatology from RO data

CDOP VS12
Dr. Luiz Sapucci
CPTEC, Brazil
Visit: Apr-Dec 2011
Topic: Implementation of ROPP for operational refractivity assimilation at CPTEC

CDOP VS07
Dr. Florian Ladstädter
University of Graz, Austria
Visit: DMI and EUMETSAT, Aug-Nov 2011
Topic: Co-locating GRAS with nadir sounders onboard Metop: An assessment for instrument and climate monitoring

2010

CDOP VS10
Dr. Christina Tavolato
University of Vienna, Austria
Visit: ECMWF, May-Oct 2010
Topic: Impact of GPS-RO measurements on the variational bias correction of radiosonde temperature measurements

2009

CDOP VS06
Prof. Michael Gorbunov
Institute for Atmosphere Physics, Russian Academy of Sciences
Visit: DMI, Sep-Oct 2009
Topic: Upgrading of OCC code for operational processing of GRAS raw sampling data

CDOP VS05
Dr. Josep Aparicio and Dr. Michael Borsche
Environment Canada and University of Graz
Visit: May 2009
Topic: ROPP-3 beta testing

2008

CDOP VS04
Prof. Michael Gorbunov
Institute for Atmosphere Physics, Russian Academy of Sciences
Visit: DMI, Nov-Dec 2008
Topic: Validation, quality control and optimization of the processing of GRAS data

CDOP VS03
Dr. Josep Aparicio
Environment Canada, Canada
Visit: Oct 2008
Topic: ROPP-2 beta testing

CDOP VS02
Prof. Michael Gorbunov
Institute for Atmosphere Physics, Russian Academy of Sciences
Visit: DMI, Jun 2008
Topic: Validation, quality control and optimization of the processing of GRAS data

2007

CDOP VS01
Dr. Michael Rennie
Met Office, Exeter, UK
Visit: UCAR, Boulder, USA, 20-25 Oct 2007
Topic: Second Formosat-3/COSMIC Data Users Workshop

2006

DP VS15
Dr. Ralf Lindau
University of Bonn, Germany
Visit: DWD/DMI, Jan-June 2006
Topic: Joint CM-GRAS SAF VS activity on: CM SAF Humidity Composite Product (HCP) and RO data

DP VS20
Dr. Armin Loescher
University of Graz, Austria
Visit: DMI, January-December 2006
Topic: Radio Occultation Processing Intercomparison Campaign (ROPIC)

2005

DP VS08
Dr. John Nash
Met Office, Exeter, UK
Visit: Met Office, March-May 2005
Topic: High-resolution radiosondes for GRAS Level 2 validation

DP VS13
Dr. Georg Beyerle
GFZ, Potsdam, Germany
Visit: DMI, June-July 2005
Topic: Open loop simulations
Report: Simulating GPS radio occultation events
DMI Scientific Report 05-09, 2005

DP VS10
Dr. Armin Loescher
University of Graz, Austria
Visit: DMI, April-December 2005
Topic: Global Climate Maps
Report: Fusion of Radio Occultation Data with ERA40 derived Fields to conduct Climate Studies

DP VS17
Dr. Oleguer Nogues
IEEC, Barcelona, Spain
Visit: IEEC, Oct 2005 - Mar 2006
Topic: Asissted Raw Sampling (ARS)

2004

DP VS01
Dr. Siebren de Haan
KNMI, The Netherlands
Visit: DMI/KNMI, Apr 2004 - Apr 2005
Topic: Global Climate Maps Based On RO Refractivity Data
Report: Global Maps from GPS Radio Occultation Data
DMI Scientific Report 05-08, DMI, Copenhagen, 2005

DP VS05
Dr. Jens Wickert
GFZ, Potsdam, Germany
Visit: DMI, Oct 2004
Topic: Comparison of retrieval chains and radio sonde analyses
Report: Comparison of Vertical Refractivity and Temperature Profiles From CHAMP With Radiosonde Measurements
DMI Scientific Report 04-09, 2004

2003

DP g16
Dr. Andrea K. Steiner
U Graz, Austria
Visit: DMI in August 2003
Topic: Error analyses of refractivity profiles
Report: Error Analyses of Refractivity Profiles Retrieved from CHAMP Radio Occultation Data
DMI Scientific Report 04-02, Copenhagen, 2004

DP VS14
Prof. Michael Gorbunov
Institute for Atmosphere Physics, Russian Academy of Sciences
Several visits at DMI 2003-2005
Topic: CT/FSI processing chain optimization and bending angle error estimation
Report: Operational Processing of CHAMP Data: Mathematical Methods, Data Filtering and Quality Control
DMI Scientific Report 05-07, DMI, Copenhagen, 2005

2000 - 2002

DP g01
Prof. Michael E. Gorbunov
Institute for Atmosphere Physics, Russian Academy of Sciences
Visit: DMI, Oct - Dec 2000
Topic: Diffraction correction methods in occultation data
Report: M. E. Gorbunov, Radioholographic methods for processing radio occultation data in multipath regions
DMI Scientific Report No. 01-02, Copenhagen, 2001.