GCOS Reference Upper-Air Network
ICM-16, Tenerife, 2025
16th Implementation and Coordination Meeting, Tenerife (ES), 17 November to 21 November 2025
Information about ICM-16
Location
Complejo Turístico Lago Martiánez, Puerto de la Cruz, Tenerife, Canary Islands, Spain
Date
17th November - 21th November 2025
Hosts
The meeting is hosted by our colleagues from AEMET (Spanish Weather Service) and will be held from Monday the 17th to Friday the 21th of November 2025 in Puerto de la Cruz, Spain. The venue is the Complejo Turístico Lago Martiánez, Avenida de Cristóbal Colón, S/N, 38400 Puerto de la Cruz, Tenerife, Canary Islands, Spain.
Organizers
- Masatomo Fujiwara (WG Co-Chair, Hokkaido University )
- Fabio Madonna (WG Co-Chair, University of Salerno)
- Caterina Tassone (GCOS)
- Tim Oakley (GCOS)
- Ruud Dirksen (GRUAN Lead Centre, DWD)
- Miguel Hernandez
- Jose Maria Rodriguez Gonzalez
- Natalia Prats
Documentation
- Report of the GRUAN ICM-16 (GCOS-270)
- Local logistics (pdf)
- GRUAN Implementation Plan 2024-2030 (GCOS-253)
- Report of the GRUAN ICM-15 (GCOS-262)
Participants
Map
Agenda of ICM-16
Status as of 2025-11-21
- Package of all presentations of Monday of ICM-16 (zip; 25.3 MiB; as at 2025-12-02)
- Package of all presentations of Tuesday of ICM-16 (zip; 41.6 MiB; as at 2025-12-02)
- Package of all posters of Tuesday of ICM-16 (zip; 22.8 MiB; as at 2025-12-18)
- Package of all presentations of Wednesday of ICM-16 (zip; 9.8 MiB; as at 2025-12-05)
- Package of all presentations of Thursday of ICM-16 (zip; 38.5 MiB; as at 2025-12-02)
- Package of all presentations of Friday of ICM-16 (zip; 22.4 MiB; as at 2025-12-02)
Monday 17 November
Registration / Orientation / Poster set-up from 08:30 to 09:30 WET/UTC
Session 1 - Welcome, Logistics and Background
Chair: Fabio Madonna / Masatomo Fujiwara, Time: 09:30 - 10:30 WET/UTC
| Times in WET/UTC | ||
| 09:30 - 09:45 | Welcome (GRUAN WG - Co-Chairs) | Fabio Madonna / Masatomo Fujiwara |
| 09:45 - 09:55 | Opening Statement (GCOS/WMO) | Caterina Tassone |
| 09:55 - 10:20 | Welcome from Local Host | AEMET and regional/local representatives |
| 10:20 - 10:30 | Meeting Logistics | Local Host |
Coffee break from 10:30 to 11:00 WET/UTC
Session 2 - Certification, updates and what has been achieved
Chair: Fabio Madonna / Masatomo Fujiwara, Time: 11:00 - 12:30 WET/UTC
| Times in WET/UTC | ||
| 11:00 - 11:15 | GRUAN fundamentals | Ruud Dirksen |
| 11:15 - 11:40 | Achievements, developments and GDP developments and GDP Status | Fabio Madonna / Masatomo Fujiwara |
| 11:40 - 12:05 | Status of Actions from the last ICM | Fabio Madonna / Masatomo Fujiwara |
| 12:05 - 12:30 | Lead Centre report for 2024-2025 | Ruud Dirksen |
Lunch from 12:30 to 14:00 WET/UTC
Session 3 - GRUAN Sites
Chair: Arnoud Apituley, Time: 14:00 - 17:00 WET/UTC
| Times in WET/UTC | ||
| 14:00 - 14:15 | Sites certification presentations | Fabio Madonna / Masatomo Fujiwara / LC |
| 14:15 - 14:30 | Summary of site reports for 2024 | Ruud Dirksen |
| 14:30 - 14:50 | TT-Sites report for ICM-16 | TT Chairs |
| 14:50 - 15:05 | GRUAN Data Management – Current status and outlook | Michael Sommer |
| 15:05 - 15:20 | Howard University Beltsville Research Site - HUBC: A Re-Introduction | Belay Demoz (Remote) |
| 15:20 - 15:35 | Research Activities at the Sodankylä site | Rigel Kivi |
Coffee break from 15:35 to 16:05 WET/UTC
| Times in WET/UTC | ||
| 16:05 - 16:20 | GRUAN Implementation in Xilinhot and Certification Report | Han Zhongqiang |
| 16:20 - 16:35 | Upper Air Measurements in Hong Kong: Operations and latest Developments | Ming Chun Lam |
| 16:35 - 17:00 | Introducing GRUAN Online Tools | Michael Sommer |
FORUM 1: Sites Forum
Moderator: Ankie Pieters, Time 17:00 - 18:00 WET/UTC
Priority topic: GRUAN networking activities and the role of GRUAN sites, including discussion on the available resources
Other topics (in order of priority): facilitation of the certification process; sensor boom orientation in SHC
Ice breaker from 18:00 to 19:30 WET/UTC
Tuesday 18 November
Dedicated time for TT to meet & discuss
09:00 - 10:00 WET/UTC
Session 4 - Multiple GDP Users/validations (Internal)
Chair: Domenico Cimini, Time: 10:00 - 12:30 WET/UTC
| Times in WET/ UTC | ||
| 10:00 - 10:30 | The statistical approach to the validation and intercomparison of reference measurements | Alessandro Fassò |
Coffee break from 10:30 to 11:00 WET/UTC
| Times in WET/UTC | ||
| 11:00 - 11:15 | The strategy of GDP's temperature uncertainty consistency assessment | Luo Haowen |
| 11:15 - 11:30 | A semi-empirical error estimation of Precipitable Water Vapour derived from GRUAN radiosonde data | Julio Castro-Almazán |
| 11:30 - 11:45 | On the consistency between GNSS and radiosonde total column water vapor data | Olivier Bock |
| 11:45 - 12:00 | Results from radiosonde GDP comparison soundings | Christoph von Rohden |
| 12:00 - 12:15 | Aiming for the stratosphere: Comparison of RS41 and CFH RH measurements | Yann Poltera |
| 12:15 - 12:30 | From GRUAN sondes to satellite radiances: uncertainty propagation using the new GRUAN sonde uncertainty | Xavier Calbet |
Lunch from 12:30 to 14:00 WET/UTC
Session 5 - Multiple GDP Users/validations (External)
Chair: Olivier Bock, Time: 14:00 - 16:30 WET/UTC
| Times in WET/UTC | ||
| 14:00 - 14:15 | CFH GDP | Holger Vömel (remote) |
| 14:15 - 14:30 | An update on the use of GRUAN sondes for the vicarious calibration of satellite microwave observations: the VICIRS study | Domenico Cimini |
| 14:30 - 14:55 | I: A 15-year climatology of solar background calibrated temperature profiles measured by the RAman Lidar for Meteorological Observations. II: Homogenization of the Payerne radiosonde PTU data timeseries since 1959 | Gianni Martucci |
| 14:55 - 15:10 | TT4 - Autolaunchers | Gonzague Romanens / Gianni Martucci |
| 15:10 - 15:25 | Chinese Integrated Meteorological Observation Network and the the Validation for FY Satellites | Zhang Peng |
Coffee break from 15:25 to 15:50 WET/UTC
| 15:50 - 16:05 | Derivation of Covariance Matrices based on GDP Uncertainties | Tom Gardiner |
| 16:05 - 16:20 | Progress on GDP for Ozonesondes | Holger Vömel (remote) |
FORUM 2: Uncertanties in GDPs and development of new GDPs
Moderator: Tom Gardiner, Time: 16:30 - 17:30 WET/UTC
Priority topic: Vertical structure of RS uncertainty
Other topics (in order of priority): discrepancy between OSCAR, requirements and current techniques; policy for GRUAN GDP developments
Poster session
17:30 - 18:30 WET/UTC
| GRUAN Site: Ny-Ålesund | Marion Maturilli | |
| GRUAN Station Cabauw/De Bilt, The Netherlands | Arnoud Apituley | |
| 25 Years of Paramaribo sonde observations: Evidence of climate change in the Tropics | Ankie Piters | |
| Measurement Uncertainty in Planetary Boundary Layer Height via Model-Based Monte Carlo Simulation | Tommaso Locatelli | |
| French GRUAN sites using M10 and M20 radiosondes | Patrick Jann | |
| Recent activities in Tenerife GRUAN site | José Rodríguez | |
| GRUAN activities at CIAO observatory | Marco Rosoldi | |
| Xilinhot (XIL) GRUAN site | Luo,Hao Wen |
Wednesday 19 November
Session 6 - Site Visit Day & Host Presentations
Time: 08:30 - 19:00 WET/UTC
| Times in WET/UTC | ||
| 08:30 - 10:00 | Bus Pickup + Travel | |
| 10:00 - 10:30 | Arrival @ Izana Research Centre (CIAI) and Coffee Break | |
| 10:30 - 11:30 | Tenerife GRUAN - potential super-site | Natalia Prats |
| Izaña Atmospheric Research Center | Carlos Torres | |
| 11:30 - 13:00 | Visit to Izana Observatory and Instrumentation | |
| 13:00 - 13:15 | Depart CIAI and travel to restaurant (Teide National Park) | |
| 13:15 - 14:45 | Lunch | |
| 14:45 - 16:00 | Depart and travel to Guimar GRUAN Site | |
| 16:00 - 16:15 | Introductory Presentation | |
| 16:15 - 16:45 | GRUAN Certification(?) and ICM-16 group photograph | |
| 16:45 - 17:45 | Depart + Travel back to Puerto de la Cruz | |
| 17:45 - 18:00 | Arrive back at hotel(s) |
Thursday 20 November
Dedicated time for TT to meet & discuss
09:00 - 10:00 WET/UTC
Session 7 - Development of new GDPs
Chair: Galina Dick, Time: 10:00 - 12:35 WET/UTC
| Times in WET/UTC | ||
| 10:00 - 10:15 | Current status of GDPs - Short Intro and discussion | WG Chairs |
| 10:15 - 10:30 | Status GDP development M10/M20 | Antoine Farah |
Coffee break from 10:30 to 11:00 WET/UTC
| Times in WET/UTC | ||
| 11:00 - 11:15 | The progression of GTH3 GDP and laboratory laboratory characterization | Guo Qiyun |
| 11:15 - 11:30 | Progress of Graw DFM-09 & DFM-17 - GRUAN data product development | Johannes Frielingsdorf |
| 11:30 - 11:45 | Testing of an automated meteorological drone at the Lindenberg Observatory (DWD) | Ben Skodda |
| 11:45 - 12:00 | Skydew GDP | Takuji Sugidachi |
| 12:00 - 12:20 | Progress with laboratory experiments for radiosonde GDPs | Christoph von Rohden |
| 12:20 - 12:35 | Systematic RS41-DFM17 dual flights at Potenza station | Marco Rosoldi |
Lunch from 12:35 to 14:00 WET/UTC
Session 8 - Science Forum: what are the biggest challenges
Chair: Marion Maturilli, Time: 14:00 - 17:00 WET/UTC
| Times in WET/UTC | ||
| 14:00 - 14:15 | SCG activity and Support to COST Action CRIM "Climate Reference Instrument and Measurements” | Arnoud Apituley |
| 14:15 - 14:30 | Exploring the tropical solar radiation profile using X-data-linked DTR and RS41 in Kota Kinabalu, Malaysia | Seonwoong Kim repr. Yong-Gyoo Kim |
| 14:30 - 14:45 | Swiss H2O Hub observations of post Hunga-Tonga UTLS water vapor with chilled mirror hygrometers | Yann Poltera |
| 14:45 - 15:00 | Using Radio Occultation to validate Radio Sonde Datasets | Axel von Engeln |
| 15:00 - 15:15 | In-flight validation of the ALBATROSS balloon-borne laser spectrometer for UTLS water vapor | Simone Brunamonti (Remote) |
| 15:15 - 15:30 | Optimizing GNSS inputs for accurate measurements of Precipitable Water Vapour in dry sites: the Canary Islands Astronomical Observatories monitors | Julio Castro-Almazán |
Coffee break from 15:30 to 16:00 WET/UTC
| Times in WET/UTC | ||
| 16:00 - 16:15 | Toward Simpler Ozone Soundings: Preliminary Data from a Solid Polymer Electrolyte Sensor | Kim Seonwoong |
| 16:15 - 16:30 | WindBorne global radiosoundings’ would be an appropriate placeholder? | Todd Hutchinson |
| 16:30 - 16:45 | Peltier Cooled Frost Point Hygrometer (PCFH) | Frank Wienhold |
| 16:45 - 17:00 | Observations for AI forecasts – what do we need? | Roland Potthast - DWD (remote) |
FORUM 3: Four key words which defines GRUAN
17:00 - 18:00 WET/UTC
Using online discussion software:ask questions and collect all answers, identify 4 key words and then discuss on these 4 words.
GRUAN ICM-16 Dinner
starting at 20:00 WET/UTC
"Invitation to the conference dinner, kindly offered and sponsored by AEMET, at Compostelana Club Café (Plaza del Charco, s/n, 38400, Puerto de la Cruz)."
Friday 21 November
Session 9 - Data processing (QA/QC)
Chair: Tom Gardiner, Time: 09:00 - 10:30 WET/UTC
| Times in WET/UTC | ||
| 09:00 - 09:15 | Research on Uncertainty of Air Temperature Measurement of GSRN | Guo Jianxia (Remote) |
| 09:15 - 09:30 | Evaluation of WindBorne data and problems with two radiosonde types | Bruce Ingleby (Remote) |
| 09:30 - 09:45 | On the uncertainty of satellite based tropospheric water vapour measurements | Johannes Nielsen |
| 09:45 - 10:00 | Proposal for user feedback on data quality and issues | Michael Sommer |
| 10:00 - 10:15 | Support to GRUAN QA&QC activities from C3S and CRIM | Fabio Madonna |
| 10:15 - 10:30 | EUMETRAVES: Overview of EUMETSAT‘s Radio Sonde Service | Axel von Engeln/ Marco Rosoldi |
Coffee break from 10:30 to 11:00 WET/UTC
Session 10 - Data provision and serving; outreach material
Chair: Christoph von Rohden, Time: 11:00 - 12:30 WET/UTC
| Times in WET/UTC | ||
| 11:00 - 11:15 | The achievements, benefits and recognition of GRUAN | Guo Qiyun |
| 11:15 - 11:30 | GRUAN Outreach Material | Simone Gagliardi |
| 11:30 - 11:45 | PANGAEA data publishing progression | Ruud Dirksen |
| 11:45 - 12:00 | GRUAN data policy | Ruud Dirksen |
| 12:00 - 12:15 | GNSS Processing Center at GFZ: Current Status of GNSS-PW GDP | Galina Dick |
| 12:15 - 12:30 | GRUAN: Reference network for climate monitoring | Nico Cimini |
Lunch from 12:30 to 14:00 WET/UTC
Session 11 - Meeting review; Actions or Key Messages
Time: 14:00 - 15:00 WET/UTC
| Times in WET/UTC | ||
| 14:00 - 14:15 | Review of progress against GRUAN IP | Fabio Madonna |
| 14:15 - 14:40 | ICM-16 Actions/Key Activities | Masatomo Fujiwara |
| 14:40 - 14:50 | Monitoring progress between ICMs | WG Chairs |
| 14:50 - 15:00 | ‘A Story’ | Tim Oakley |
Session 12 - Closing remarks & ICM-17
Time: 15:00 - 15:30 WET/UTC
| Times in WET/UTC | ||
| 15:00 - 15:30 | Proposal for Next ICM meeting - Xilinhot - Inner Mongolia, China |
Documents of ICM-16
Status as of 2025-11-14
Package of all documents of GRUAN ICM-16 (zip; 8 MiB; as at 2025-11-14)
Information
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