Visiting Scientist Program

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List of long-term Visiting Scientists

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.