Programme

OPAC-IROWG 2026, the Joint OPAC-8 and IROWG-11 Workshop, is held from Thursday, September 10, to Wednesday, September 16. Morning sessions (about 9–10:30, 11–12:30), afternoon sessions (about 14–15:30), and late afternoon/early evening sessions (about 16–17:30 oral and 17:30–19:00 posters) are foreseen. Sufficient informal coffee breaks (30 min) and lunch time (90 min) is left in between. We start on Thursday morning and finish Wednesday noon.

The IROWG-11 Working Group meetings of subgroups will be held on Sat, September 12. Subgroups are Numerical Weather Prediction (NWP), Climate, Innovation, and Space Weather.

08:00-09:00 Registration (and poster mounting time)

09:00-09:20 Welcome & Opening Event
Moderator: Gottfried Kirchengast

• Welcome and Remarks by the Organizers
  Ulrich Foelsche, Julia Danzer, Marc Schwärz (OPAC-8): Organizational remarks
  Hui Shao, Tony Mannucci (IROWG-11): IROWG introductory remarks
• Welcome Address
  Andrea Steiner (Dean – School of Environmental & Regional Sciences and Education, University of Graz)

09:20-10:30 Opening Talks
Moderator: Ulrich Foelsche

• 09:20-09:50 GNSS-RO for Climate (keynote)
  William Randel, Jon Starr, Fei Wu, Richard Anthes, Jeremiah Sjoberg,
  Zhen Zeng, and Sergey Sokolovskiy
• 09:50-10:10 Occultations for probing atmosphere and climate at Uni Graz: highlights from 30 years ARSCliSys Research Group science (invited)
  Gottfried Kirchengast
• 10:10-10:30 Current and future activities in radio occultation at EUMETSAT (invited – 40 years EUMETSAT)
  Christian Marquardt, Pedro Cozinheiro, Axel von Engeln, Elżbieta Lasota,
  Francisco Martín Alemany, Riccardo Notarpietro, Sebastiano Padovan, Saverio
  Paolella, Verónica Rivas Boscán, and Francisco Sancho

10:30-11:00 Coffee Break (and poster mounting time)

11:00-12:25 Morning Session: Current Missions 1
Chair: Rob Kursinski

• 11:00-11:20 COSMIC Data Analysis and Archive Center GNSS Radio Occultation Status
  (invited)
  Maggie Sleziak-Sallee, J. Weiss, J. Braun, C. Brown, I. Cherniak, D. Hunt,
  E. Lauer, G. Romero, S. Sokolovskiy, T. VanHove, H. Veitel, I. Zakharenkova, Z.
  Zeng, and J. Zhang
• 11:20-11:40 Status on the processing of new and old satellite missions at the ROM SAF
  (invited)
  Stig Syndergaard, Kent B. Lauritsen, Johannes K. Nielsen, and Hans Gleisner
• 11:40-11:55 NOAA NESDIS Commercial Data Program - Overview and Status
  Marc Gasbarro, Natalie Laudier, Gerard Peltzer, Harshesh Patel, and Lin Lin
• 11:55-12:15 PlanetiQ GNSS-RO Observing System: 2026 Update (invited)
  Jonathan Brandmeyer, E. Robert Kursinski, Chris McCormick and Paul McGaugh
• 12:15-12:25 Operational and Emerging Capabilities from Spire's GNSS-RO and GNSS-R
  Constellation (invited)
  Vu Nguyen, Philip Jales, Matthieu Talpe, Jessica Cartwright, and Giorgio
  Savastano

12:25-14:00 Lunch Break

14:00-15:45 Afternoon Session 1: Current to Future Missions
Chair: Kent B. Lauritsen

• 14:00-14:20 NOAA Commercial RO - Planning for the Future (invited)
  Marc Gasbarro, Natalie Laudier, Christopher Barsoum, William Gullotta, Scott
  Schnee, Jan-Peter Weiss, and Gerard Peltzer
• 14:20-14:35 Balancing RO Architecture and Design with Enterprise Needs: Take-Aways from the NOAA RO Analysis of Alternatives
  William Gullotta, Christopher Barsoum, Natalie Laudier, Marc Gasbarro, Gerald
  Peltzer, Chunhui Pan, and Jan Weiss
• 14:35-14:50 Radio Occultation on Metop-D: Mission Overview and First Results
  Riccardo Notarpietro, Saverio Paolella, Christian Marquardt, Axel von Engeln,
  Verónica Rivas Boscán, Francisco Sancho, Sebastiano Padovan, Francisco Martín
  Alemany, Pedro Cozinheiro, and Elżbieta Lasota
• 14:50-15:10 Updates on FY3F/3G/3H status and Private Sector Engagement (invited)
  Mi Liao, Lu Wenqiang, Liu yan, Tang Qi, and Cheng Yan
• 15:10-15:30 Overview of YunYao RO Constellation, Data Processing and Data Quality
  (invited)
  Yan Cheng, Li Fenghui, Fu Naieng, Xia Sai, Xu Bobo, Li Xingguo, Yan Mingming,
  and Guan Wenting
• 15:30-15:45 Performance of Occultation Data from the Miniaturized GNSS Occultation
  Sounder (GNOS-M) Onboard the TianMu-1 Satellite Constellation
  Congliang Liu, Yueqiang Sun, Jiahui Liang, and Weihua Bai

15:45-16:15 Coffee Break

16:15-17:35 Afternoon Session 2: Specific occultation methods – Reflections and Airborne
Chair: Chi O. Ao

• 16:15-16:35 Characterizing Earth’s Planetary Boundary Layer (PBL) Using Grazing Reflected Signals (invited)
  Panagiotis Vergados, Kuo-Nung Wang, and Chi O. Ao
• 16:35-16:50 Tracking Sentinel-6 GNSS-RO Grazing Reflection Signals and its PBL
  Characterization Applications
  Kuo-Nung Wang, T. K. Meehan, C. R. Galley, C. O. Ao, and A. R. Dorsey
• 16:50-17:05 Toward a Mission-Agnostic Machine Learning Framework for GNSS-R Wind
  Speed Retrieval
  Elżbieta Lasota, Sebastiano Padovan, Francisco Martín Alemany, and Christian
  Marquardt
• 17:05-17:20 1D-Var retrieval using refractivity observations from GNSS airborne radio
  occultation
  Paweł Hordyniec and Aleksandra Maciejewska
• 17:20-17:35 Augmenting the dataset for investigating surface fluxes in atmospheric rivers using open-loop tracking airborne radio occultation in the lower troposphere
  Priyankar Bhattacharjee, Bing Cao, Noah Barton, and Jennifer S. Haase
• 17:35 Thursday Scientific Sessions Adjourn

18:00-22:00 Get-Together Party

09:00-10:35 Morning Session 1: NWP 1 – Processing, Assimilation and Forecasting Advancements
Chair: Harald Anlauf

• 09:00-09:20 Status of GNSS-RO assimilation at ECWMF (invited)
  Sean Healy and Katrin Lonitz
• 09:20-09:35 Impact evaluation of GPS Radio Occultation (GNSS-RO) In Australian Regional Models (remote)
  Birtukan Biadglgne, Fiona Smith, Andrew Smith, and Nahidul Hoque Samrat
• 09:35-09:50 GNSS RO Data Assimilation in the NOAA GFS: Recent Progress
  Xuanli Li, Catherine Thomas, Haixia Liu, Andrew Collard, and Daniel Holdaway
• 09:50-10:05 Estimation of GNSS RO Observation Impact in CMA Global Numerical Weather Prediction System
  Yan Liu
• 10:05-10:20 Impact of 2D ROPP Forward Operators and Airborne Radio Occultation Assimilation on Global Numerical Weather Prediction
  Hui Christophersen, Zoe Zibton, Jacob Gull, and Chris Hartman
• 10:20-10:35 Increasing the impact of GNSS-RO observations in the Met Office NWP system
  Neill Bowler and Liam J. Hall

10:35-11:05 Coffee Break

11:05-12:30 Morning Session 2: Atmospheric Physics and Climate 1
Chair: Bill Randel

• 11:05-11:25 Global Variability of Double Tropopauses from Radio Occultation and Their Links to Climate Modes (invited)
  Alejandro de la Torre, Peter Alexander, Torsten Schmidt, Andrea Steiner, Florian
  Ladstädter, and Rodrigo Hierro
• 11:25-11:40 The impact of atmospheric extremes on tropopause characteristics
  Matthias Stocker, Florian Ladstädter, and Johannes K. Nielsen
• 11:40-11:55 Latest results in radio occultation wind field monitoring and analysis
  Julia Danzer, Irena Nimac, and Annika Reiter
• 11:55-12:10 Climatological Regimes of Precipitable Water Vapor Revealed by Clustering of GNSS Radio Occultation and ERA5 Data
  Peter Alexander and Alejandro de la Torre
• 12:10-12:25 Assessment of GRAS-RO and MW/IR Instruments on Metop-A in UTLS: Brightness Temperature Comparison
  Vinícius Ludwig-Barbosa, Hans Gleisner, Kent B. Lauritsen, Timo
  Hanschmann, Viju O. John, and Axel Von Engeln

12:25-12:35 Group photo

12:35-14:00 Lunch Break

14:00-15:35 Afternoon Session 1: Occultation Methodology 1
Chair: Stig Syndergaard

• 14:00-14:20 An update of the estimation of the refractivity expression (invited)
  Josep Aparicio
• 14:20-14:35 Recent updates to the CDAAC neutral atmospheric RO data processing system
  Zhen Zeng, Jeremiah Sjoberg, Sergey Sokolovskiy, Jan-Peter Weiss, John Braun,
  Douglas Hunt, Teresa Vanhove, and Maggie Sleziak-Sallee
• 14:35-14:50 Characterizing Residual Ionospheric Errors in GNSS RO Bending Angles: A
  Comparative Analysis of COSMIC-1 and COSMIC-2
  Jaehee Chang, Jiyun Lee, Sergey Sokolovskiy, Zhen Zeng, and John Braun
• 14:50-15:05 Tandem Radio Occultation Experiments for Direct Estimation of Bending Angle
  Uncertainty: Metop and Sentinel-6 Applications
  Saverio Paolella, Riccardo Notarpietro, Sebastiano Padovan, Verónica Rivas
  Boscán, Francisco Sancho, Christian Marquardt, Axel von Engeln, Francisco
  Martín Alemany, Elżbieta Lasota, and Pedro Cozinheiro
• 15:05-15:20 GNSS RO bending angle accuracy in the lower troposphere
  Rob Kursinski, Xuelei Feng, Kevin Nelson and Jonathan Brandmeyer
• 15:20-15:35 Commercial and COSMIC-2 GNSS-RO Neutral Atmosphere Near-real-time Product Processing and Generation at NOAA/STAR and Performance
  Assessment
  Yong Chen, Changyong Cao, Xi Shao, Tom Liu, Xinjia Zhou, Xin Jing, Ming Chen,
  Jun Zhou, Bin Zhang, and William Miller

15:35-16:00 Coffee Break

16:00-17:00 Afternoon Session 2: IROWG
Chair: Christian Marquardt

• 16:00-16:30 IROWG: Reports from CGMS-53 and CGMS-54
  Tony Mannucci, Ulrich Foelsche, and Hui Shao
• 16:30-17:00
  Open Actions from CGMS WGII and WGIII
  Pre-Planning of IROWG-12 (2027/28)
  Preparig the IROWG co-chair election

17:00-19:00 Poster Session
Chair: Congliang Liu

• P1 COSMIC-2 Payload Status - From Launch through Extended Mission
  John Braun
• P2 Evaluation of NOAA STAR-processed COSMIC-2 and Commercial GNSS RO
  Bending Angle Assimilation in the GFS Model
  William Miller, Yong Chen, and Xi (Sean) Shao
• P3 Application of the three-cornered hat method to evaluate and compare model
  analyses and forecasts
  Jeremiah Sjoberg, Amal El Akkraoui, and Richard Anthes
• P4 Impact of Vertical Observation Error Modeling of GNSS RO on Forecast
  Performance in the Korean Integrated Model
  Eun-Hee Kim, Hyoung-Wook Chun and Yong Hee Lee
• P5 Modulating the RO observation operator when assimilating 35,000 radio
  occultations per day during ROMEX
  Katrin Lonitz and Sean Healy
• P6 Evaluating the impact of a ray-tracing operator on the assimilation of Radio
  Occultation Observations Using JEDI and the GFS Atmospheric Model
  Hailing Zhang, Hui Shao, John Braun, and Zhen Zeng
• P7 Developing a Forward Operator on Polarimetric Radio Occultation (PRO)
  observations
  Kuo-Nung Wang, T. L. Kubar, C. O. Ao, F. J. Turk and R. Padullés
• P8 Assessing the potential of GNSS-R for tropospheric sensing using signal
  simulations
  Wiktoria Kowalczyk and Witold Rohm
• P9 1DVAR assimilation of GNSS-ARO observations in ROPP software
  Aleksandra Maciejewska and Paweł Hordyniec
• P10 GNSS Radio Occultation Ducting in the Tropical Cyclone Boundary Layer and
  Implications for NWP Data Assimilation
  Kevin Nelson, E. Robert Kursinski, and Xuelei Feng
• P11 ROM SAF radio occultation activities for the period 2027 to 2032
  Kent Lauritsen
• P12 Construction and Application of Radio Occultation Bending Angle Climatology for Quality Control and Assessing Spatio-Temporal Variability
  Aashish Tripathee and Jonathan Brandmeyer
• P13 Robust Detection and Extraction of Radio Occultation (RO) Reflection Signals for Lower Troposphere Profiling
  Aashish Tripathee and Jonathan Brandmeyer
• P14 Tropopause variability at the edge of the tropics and the expansion of the tropical belt
  Florian Ladstädter, Anna Payer, Sebastian Scher and Andrea Steiner
• P15 Characterizing and Correcting GNSS Radio Occultation IWV Bias in AtmosphericbRiver Conditions Using Multi-Source Observations
  Bahareh Rahimi and Ulrich Foelsche
• P16 Retrieval of Multi-GNSS TEC and Electron Density Profiles from Radio
  Occultation at NOAA/STAR with Applications to Recent Space Weather Storms
  Xi Shao, Yong Chen, Tom Liu, Xin Jing, and William Miller
• P17 Altitude and Spatial Distribution of Equatorial Plasma Bubbles Derived From
  GNSS Radio Occultation and Compared With GOLD Radiance Images
  Carles Quilis Alfonso, Vinícius Ludwig-Barbosa, Joel Rasch, Anders Carlström,
  Saleh Javadi, Viet Thuy Vu, and Mats I. Pettersson 
• P18 Calibration, Processing, and Operations of the PlanetiQ Total Electron Content Observations
  Jonathan Brandmeyer, E. Robert Kursinski, and PlanetiQ engineering staff
• P19 Ionospheric Occultations and Scintillations from Cosmic-2 and Sentinel-6 Radio Occultation Antennas
  Tom K. Meehan, Chi Ao, and Angela Dorsey
• P20 Comparing IRI-2020 Ray Tracing Absorption Estimates with Observed 10 MHz Signal Strength via the HamSCI GRAPE Network
  Gamal Zayed, Kuldeep Pandey, and Nathaniel Frissell
• P21 All-Sky Radiative Transfer Simulations Enabling Joint Interpretation of
  Polarimetric Radio Occultation and Passive Microwave Observations for
  Hydrometeor Characterization using WRF–ARTS
  Verònica Vidal, Ramon Padullés, Antía Paz Carracedo, and Estel Cardellach

19:00 Friday Adjourn

19:00-20:00 Dinner

09:00-10:30 IROWG Subgroup Working Meetings

10:30-11:00 Coffee Break

11:00-12:30 Consolidation of IROWG Subgroup-Recommendations

12:30-13:30 Lunch Break

13:30-22:00 Excursion and Dinner

Free – explore Castle Seggau, the surroundings, or make a trip to Graz (not included in the registration fee).

09:00-10:35 Morning Session 1: Specific occultation methods – Polarized and Infrared
Chair: Antía Paz Carracedo

• 09:00-09:20 Polarimetric Radio Occultations: Processing, simulations and exploitation (invited)
  Ramon Padullés, Estel Cardellach, Antía Paz Carracedo, Verònica Vidal, and S.
  Oliveras 
• 09:20-09:35 Processing Polarimetric Radio-Occultation Soundings with Wave Optics Methods
  Jonathan Brandmeyer and E. Robert Kursinski 
• 09:35-09:55 PlanetiQ linearly polarized RO results measuring precipitation
  Rob Kursinski, Jonathan Brandmeyer, Kevin Nelson, and Xuelei Feng (invited)
• 09:55-10:10 Development of a broadband frequency locked laser source for SWIR atmospheric occultation measurements
  Ting Yu, Jing Liu, Botao Li, Zhenxing He, Yuchen Wang, Jiaqi Zhou, Bo Dai, and
  Weibiao Chen 
• 10:10-10:25 Fulllink uncertainty evaluation for spaceborne infrared laser occultation measurements
  Shuo Huang, Yun-Meng Liu, and Shizhao Li

10:25-10:55 Coffee Break

10:55-12:30 Morning Session 2: Current Missions 2
Chair: Maggie Sleziak-Sallee

• 10:55-11:15 The Operation and Orbit maintenance of FORMOSAT-7/COSMIC-2
  Constellation
  Cheng-Yung Huang, I-te Lee, Chao-Yen Chen, Wen-Tzong Shian, Wen-Chuang Huang, Wen hao Yeh, and Kun-Lin Chen (invited)
• 11:15-11:30 GRAS-2 In-Orbit Verification Results for the First Metop-SG Satellite
  Anders Carlström, Joel Rasch, Thomas Liljegren, and Beyond Gravity Sweden
• 11:30-11:45 Precise orbit determination for Metop-D at EUMETSAT: status and challenges
  Verónica Rivas Boscán, Sebastiano Padovan, Saverio Paolella, Riccardo Notarpietro, Francisco Sancho, Axel von Engeln, Christian Marquardt, Francisco
  Martín Alemany, Pedro Cozinheiro, and Elżbieta Lasota
• 11:45-12:00 Sentinel-6B Non-Time-Critical Radio Occultation products by EUMETSAT
  Sebastiano Padovan, Axel von Engel, Saverio Paolella, Riccardo Notarpietro,
  Verónica Rivas Boscán, Francisco Sancho, Francisco Martín Alemany, Elżbieta
  Lasota, Pedro Cozinheiro, and Christian Marquardt
• 12:00-12:15 Enhanced PBL Capabilities from the COSMIC-2 and Sentinel-6 Missions
  Chi Ao, Chad Galley, Thomas K. Meehan, Panagiotis Vergados, and Kuo-Nung
  Wang
• 12:15-12:30 Advance of the Climate and Atmospheric Composition Exploring Satellites Mission (CACES) in China
  Xin Wang, Xuemei Zong, and Zhihua Zhang

12:30-14:00 Lunch Break

14:00-15:35 Afternoon Session 1: Radio Occultation Data for Climate Monitoring
Chair: Johannes Nielsen

• 14:00-14:20 GNSS radio occultation processing at the GFZ: 25 years of data for weather forecast and climate research (invited)
  Torsten Schmidt, Patrick Schreiner, and Jens Wickert
• 14:20-14:35 EUMETSAT Reprocessing Activities
  Francisco Martín Alemany, Francisco Sancho, Christian Marquardt, Axel Von
  Engeln, Verónica Rivas Boscán, Sebastiano Padovan, Saverio Paolella, Riccardo
  Notarpietro, Elżbieta Lasota, and Pedro Cozinheiro
• 14:35-14:50 How recent armed conflicts disrupt RO GNSS climate monitoring
  Sebastian Scher and Florian Ladstädter
• 14:50-15:05 The radio occultation reprocessing at the Wegener Center: Validation and uncertainty evaluation of rOPS long-term climate monitoring data
  Marc Schwärz, Gottfried Kirchengast, Josef Innerkofler, and Armin Leuprecht
• 15:05-15:20 Methodology for determining climatic winds from radio occultation data
  Irena Nimac, Johannes Unegg, and Julia Danzer
• 15:20-15:35 Propagating GNSS RO uncertainties to aggregated fields and trend estimates
  Florian Ladstädter, Sebastian Scher, Marc Schwärz, Josef Innerkofler, Andrea
  Steiner, and Gottfried Kirchengast

15:35-16:05 Coffee Break

16:05-17:50 Afternoon Session 2: NWP 2 – ROMEX Data Usage
Chair: Dominique Raspaud

• 16:05-16:20 An extended ROMEX experiment
  Christian Marquardt, Liao Mi, Xu Na, Lu Wenqiang, Liu Yan, Tang Qi, and Cheng
  Yan
• 16:20-16:35 Dry temperature comparisons and diurnal variability from ROMEX radio occultation observations
  Jeremiah Sjoberg, Richard Anthes, Jon Starr, and Douglas Hunt
• 16:35-16:50 Status of GNSS-RO in global data assimilation at DWD
  Harald Anlauf
• 16:50-17:05 GNSS-RO capabilities in JEDI
  Ben Ruston, François Vandenberghe, Hailing Zhang, Lindsey Hayden and
  Rajeswari Chidambaram, and Neill Bowler
• 17:05-17:20 Global Forecast Impacts of Radio Occultation Observations Using Traditional and AI-Based Data Assimilation with the AIFS
  Kristen Bathmann, Sanita Vetra-Carvalho, Karina Apodaca-Martinez, Luis Vela,
  Tom Gowan, and Mathew Rothstein
• 17:20-17:35 Radio occultation simulation and prediction at EUMETSAT: current and future applications
  Francisco Sancho, Axel von Engeln, Verónica Rivas Boscán, Sebastiano
  Padovan, Christian Marquardt, Riccardo Notarpietro, Saverio Paolella,
  Francisco Martín Alemany, Elżbieta Lasota, and Pedro Cozinheiro
• 17:35-17:50 Beyond COSMIC-2: Can polar and mid-inclination orbits fill the tropical gap?
  Francisco Sancho, Christian Marquardt, Axel von Engeln, Pedro Cozinheiro,
  Elżbieta Lasota, Francisco Martín Alemany, Riccardo Notarpietro, Sebastiano
  Padovan, Saverio Paolella, and Verónica Rivas Boscán

17:50 Monday Scientific Sessions Adjourn

18:30-19:30 Dinner

20:00-22:00 Wine Tour

09:00-10:15 Morning Session 1: Occultations in ionospheric and planetary science
Chair: Riccardo Notarpietro

• 09:00-09:15 Performance Assessment of Total Electron Content Products from the Spire Constellation
  Matthieu Talpe, Vu Nguyen, Philip Jales, and Surabhi Guruprasad
• 09:15-09:30 Development of GNSS-Based Data Assimilation for Space Weather at NRL Using JEDI
  Hui Shao, David Kuhl, John Haiducek, Peter Caffrey, Lindsey Hayden, Francois
  Hebert, and Nick Pedatella
• 09:30-09:45 Ionospheric Radio Occultation Data from LEO Satellite Constellations and Their Data Assimilation Applications
  Naifeng Fu, Fenghui Li, Yan cheng, Wanganyin Cui, and Feiteng Meng
• 09:45-10:00 Equatorial ionospheric irregularities from the COSMIC-2 mission during solar cycle 25
  John Braun, Irina Zakharenkova, Iurii Cherniak, Sergey Sokolovskiy, Qian Wu,
  and Jan-Peter Weiss
• 10:00-10:15 Definition of system requirements and hardware selection for a cross-link radio occultation instrument to observe the lunar ionosphere
  Giacomo Radaelli, Richard B. Langley, Chris Watson, and Ulrich Foelsche

10:15-10:45 Coffee Break

10:45-12:30 Morning Session 2: NWP 3
Chair: Ben Ruston

• 10:45-11:00 Taking into account the uncertainty in the expression of refractivity in the GNSSRO observation operator
  Dominique Raspaud
• 11:00-11:15 Towards the Operational Assimilation of Polarimetric Radio Occultations: Forward operator development and NWP applications
  Antía Paz Carracedo, Ramon Padullés, Estel Cardellach, Katrin Lonitz,
  Dominique Raspaud and Clotilde Augros, and Mary Borderies
• 11:15-11:30 First results from assimilating Polarimetric RO data
  Katrin Lonitz, Noureddine Semane, and Sean Healy
• 11:30-11:45 Integrated Impact of GNSS-RO and GNSS-R Data Assimilation on Tropical Cyclogenesis Prediction: A Case Study of Typhoon Gaemi (2024)
  Shu-Ya Chen and Quan Pham Xuan
• 11:45-12:00 Assessments of new data sources and observation error statistics
  Liam Hall and Neill E. Bowler
• 12:00-12:15 Study on the Distribution Characteristics and Collaboration of Global GNSS Occultation Missions
  Wenqiang Lu, Na Xu, Chengli Qi, Mi Liao, Xiuqing Hu, Guanglin Yang, Yan Liu,
  and Xiangguang Meng
• 12:15-12:30 Spatiotemporal Resolution in Radio Occultation: The Interdependent Design Loop Between Weather Model Performance and Constellation Design
  Nikki Privé, Christopher Barsoum, Douglas Hunt, Michael J. Murphy, Richard
  Anthes, William Gullotta, Natalie Laudier

12:30-14:00 Lunch Break

14:00-15:30 Afternoon Session 1: New Techniques – AI and NI
Chair: Anders Carlström

• 14:00-14:15 Bias characteristics and estimation of the FORMOSAT-7/COSMIC-2 radio occultation bending angle in the low troposphere with a machine learning
  algorithm
  Gia-Huan Pham, Shu-Chih Yang, Shu-Ya Chen, Cheng-Yung Huang, and Kuo-
  Nung Wang
• 14:15-14:30 Processing deep occultation data from GRAS-2 using sliding window phase matching and multiple correlators
  Joel Rasch, Anders Carlström, and Thomas Liljegren
• 14:30-14:45 Wavelet-Transform-based Phase Matching Method for Impact Multipath Mitigation in GNSS Radio Occultation
  Jonghyeon Park, Jaehee Chang, and Jiyun Lee
• 14:45-15:00 Reliable Ducting Detection with Sliding Window Phase Matching
  Jonathan Brandmeyer, E. Robert Kursinski, and Xuelei Feng
• 15:00-15:15 Deep Learning for Detecting Atmospheric Ducting in GNSS-RO Data
  Hsiang-Wen Cheng, Chung-Yu Shih, Kai-Hsun Chen, Wen-Chien Chang,
  Shu-Chih Yang, Cissi Ying-Tsen Lin, Chia-Hui Chang, Feng-Nan Hwang,
  Cheng-Yung Huang, and Yi-Hsiu Chen
• 15:15-15:30 Generating realistic synthetic RO soundings in extreme atmospheric events
  Clémence Allietta, Rémi Douvenot, and Sonia Cafieri

15:30-16:00 Coffee Break

16:00-17:20 Afternoon Session 2: Climate Trends and Water Vapor
Chair: Panagiotis Vergados

• 16:00-16:20 Atmospheric temperature trends from observations: an update (invited)
  Andrea Steiner, Florian Ladstädter, Matthias Stocker, Stephen Po-Chedley, and
  the APARC ATC Activity
• 16:20-16:35 Leveraging GNSS radio occultation excess phase and bending angle observables for anthropogenic climate signal detection in the troposphere and stratosphere
  Josef Innerkofler, Gottfried Kirchengast, Florian Ladstädter and Marc Schwärz
• 16:35-16:50 An observational perspective on wind trends: a comparison of RO and reanalysis data
  Annika Reiter, Irena Nimac, and Julia Danzer
• 16:50-17:05 The ROM SAF tropospheric humidity Climate Data Record development.
  Johannes Nielsen, Kent B. Lauritsen, Hans Gleisner and Stig Syndergaard, and
  Vinícius Ludwig-Barbosa
• 17:05-17:20 Observing Atmospheric Rivers and their Vertical Structure with GNSS Radio Occultation
  Ulrich Foelsche, Bahareh Rahimi, and Linda M. Maier

17:20 Tuesday Scientific Sessions Adjourn

18:00-19:00 Dinner

19:00-21:00 WGIII discussion (IROWG to assess the impact of the decline in COSMIC data availability)

09:00-09:40 Morning Session 1: IROWG – Reporting of Subgroups
Chair: Tony Mannucci

• 09:00-09:20 Reporting of the IROWG Subgroup on NWP (invited)
  Neill Bowler and Katrin Lonitz (Subgroup co-chairs)
• 09:20-09:40 Reporting of the IROWG Subgroup on Climate (invited)
  Panagiotis Vergados and Andrea Steiner (Subgroup rapporteur and chair)
• 09:40-10:00 Reporting of the IROWG Subgroup on Space Weather (invited)
  Riccardo Notarpietro (Subgroup rapporteur) and NN acting chair
• 10:00-10:20 Reporting of the IROWG Subgroup on Innovation (invited)
  John Braun and Rob Kursinski (Subgroup rapporteur and chair)

10:20-10:50 Coffee Break

10:50-12:50 Morning Session 2: IROWG Recommendations to CGMS
Chairs: Hui Shao and Ulrich Foelsche

• 10:50-11:05 Report from WGIII discussion to CGMS
  11:05-11:10 BUFR format brief
  Harald Anlauf, Christian Marquardt, Hui Shao
• 11:10-12:50 Main IROWG Recommendations to CGMS
  Moderated by IROWG co-chairs

12:50-13:00 Workshop Wrap-up & Farewell

13:00-14:00 Lunch (optional)