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Monday, 4 September 2023
13:15 to 14:00 Registration and welcome
13:15 to 13:45 Registration and coffee

Weather Room

13:45 to 14:00 Welcome and opening remarks
Video recording
Speaker: Florence Rabier (ECMWF)
14:00 to 17:15 Session 1: Setting the scene
Chair: Bill Bell
Co-Chair: Hans Hersbach
14:00 to 14:15 Seminar walk through
Video recording
Speaker: Bill Bell (ECMWF)
Speaker: Hans Hersbach (ECMWF)
14:15 to 15:00 Introduction to reanalysis
Presentation slides
Video recording
Speaker: Dick Dee (Planet-A consulting)
15:00 to 15:45 Coffee break
15:45 to 16:30 Cutting-edge climate applications built upon atmospheric reanalysis: a user’s perspective
Presentation slides
Video recording
Speaker: Chiara Cagnazzo (ECMWF)
16:30 to 17:15 Towards Earth-system reanalysis
Presentation slides
Video recording
Speaker: Patricia de Rosnay (ECMWF)
17:15 to 19:00 Poster session and ice breaker
17:15 to 17:40 Express poster presentations
Video recording
17:40 to 19:00 Poster session and ice breaker

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Tuesday, 5 September 2023
09:15 to 14:00 Session 2: Overview of reanalysis activities

Chair: Tony McNally
Co-Chair: Paul Poli

09:15 to 10:00 Reanalysis activities at the NASA Global Modeling and Assimilation Office
Presentation slides
Video recording
Speaker: Amal El Akkraoui (NASA)
10:00 to 10:45 ECMWF reanalysis activities: from research to operations
Presentation slides
Video recording
Speaker: Hans Hersbach (ECMWF)
10:45 to 11:15 Group photo and coffee break
11:15 to 12:00 Ocean and sea-ice reanalyses
Presentation slides
Video recording
Speaker: Hao Zuo (ECMWF)
12:00 to 12:45 The Land Surface in Earth System Reanalysis
Video recording
Speaker: Rolf Reichle (NASA Goddard Space Flight Center)
12:45 to 14:00 Lunch
14:00 to 16:00 Session 2: Overview of reanalysis activities (cont.)

Chair: Antje Inness
Co-Chair: Patricia de Rosnay

14:00 to 14:45 The value of global hydrological reanalysis
Presentation slides
Video recording
Speaker: Christel Prudhomme (ECMWF)
14:45 to 15:30 Atmospheric composition reanalysis
Presentation slides
Video recording
Speaker: Kazuyuki Miyazaki (NASA JPL)
15:30 to 16:00 Coffee break
16:00 to 17:30 Session 2: Overview of reanalysis activities (cont.)

Chair: Hans Hersbach
Co-Chair: Chiara Cagnazzo

16:00 to 16:45 Overview of reanalysis activities: Regional Reanalysis
Presentation slides
Video recording
Speaker: Harald Schyberg (Norwegian Meteorological Institute)
16:45 to 17:30 Centennial reanalysis
Presentation slides
Video recording
Speaker: Laura Slivinski (NOAA)

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Wednesday, 6 September 2023
09:15 to 11:15 Session 3: Data assimilation methodology

Chair: Patrick Laloyaux
Co-Chair: Bill Bell

09:15 to 10:00 Overview of data assimilation methods
Presentation slides
Video recording
Speaker: Femke Vossepoel (Delft University of Technology)
10:00 to 10:45 Diversity in reanalysis products and opportunities for collaboration
Presentation slides
Video recording
Speaker: Sergey Frolov (NOAA PSL)
10:45 to 11:15 Coffee break
11:15 to 14:00 Session 4: Observations

Chair: Bill Bell
Co-Chair: Patricia de Rosnay

11:15 to 12:00 To what extent are reanalyses actually constrained by observations?
Presentation slides
Video recording
Speaker: Tony McNally (ECMWF)
12:00 to 12:45 Data rescue and reprocessing
Presentation slides
Video recording
Speaker: Paul Poli (ECMWF/C3S)
12:45 to 14:00 Lunch
14:00 to 16:00 Session 5: Historical gridded forcing fields

Chair: Hans Hersbach
Co-Chair: Antje Inness

14:00 to 14:45 Reconstruction of sea-surface temperature and sea-ice datasets
Presentation slides
Video recording
Speaker: Nick Rayner (Met Office)
14:45 to 15:30 Towards consistent representation of the boundary forcing temporal variability in Earth System Reanalyses, reforecasts and climate integrations
Presentation slides
Video recording
Speaker: Magdalena Alonso Balmaseda (ECMWF)
15:30 to 16:00 Coffee break
16:00 to 17:30 Session 6: Validation and inter-comparison of reanalyses

Chair: Chiara Cagnazzo
Co-Chair: Bill Bell

16:00 to 16:45 Evaluation of processes and inter-annual variability in global atmospheric reanalyses
Presentation slides
Video recording
Speaker: Michaela Hegglin (Forschungszentrum Jülich / University of Reading)
16:45 to 17:30 Evaluation of ocean reanalyses
Presentation slides
Video recording
Speaker: Marie Drévillon (Mercator Ocean)
17:30 to 20:30 Annual Seminar dinner
17:30 to 18:30 Pre-dinner drinks
18:30 to 20:30 Annual Seminar dinner

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Thursday, 7 September 2023
09:15 to 14:00 Session 7: Challenges and research

Chair: Magdalena Alonso Balmaseda
Co-Chair: Patrick Laloyaux

09:15 to 10:00 Bias in Reanalysis
Presentation slides
Video recording
Speaker: Bill Bell (ECMWF)
10:00 to 10:45 Global reanalysis precipitation datasets for hydrological modelling in data scarce regions: A case study of Kenya
Presentation slides
Video recording
Speaker: Maureen Wanzala (Welthungerhilfe (WHH))
10:45 to 11:15 Coffee break
11:15 to 12:00 Palaeoclimate reconstruction using data assimilation: the ModE-RA data set
Presentation slides
Video recording
Speaker: Stefan Brönnimann (University of Bern)
12:00 to 12:45 Long coupled Earth System reanalysis with a focus on ocean and sea ice
Presentation slides
Video recording
Speaker: François Counillon (NERSC/UoB)
12:45 to 14:00 Lunch
14:00 to 16:00 Session 7: Challenges and research (cont.)

Chair: Bill Bell
Co-Chair: Patrick Laloyaux

14:00 to 14:45 Reanalysis: the bedrock of machine learning of the Earth system
Presentation slides
Video recording
Speaker: Matthew Chantry (ECMWF)
14:45 to 15:30 Exploiting reanalyses in studies and services related to climatic trends
Presentation slides
Video recording
Speaker: Adrian Simmons (ECMWF)
15:30 to 16:00 Coffee break
16:00 to 17:30 Session 7: Challenges and research (cont.)

Chair: Patrick Laloyaux
Co-Chair: Paul Poli

16:00 to 16:45 Extremes in reanalysis and observational products
Presentation slides
Video recording
Speaker: Markus Donat (Barcelona Supercomputing Center and ICREA)
16:45 to 17:30 On reanalysis production and quality assurance
Presentation slides
Video recording
Speaker: Dinand Schepers (ecmwf)

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Friday, 8 September 2023
09:15 to 13:15 Session 8: Towards consistent Earth System Reanalysis

Chair: Patricia de Rosnay
Co-Chair: Paul Poli

09:15 to 10:00 Improving land-atmosphere data assimiliation coupling in future reanalyses
Presentation slides
Video recording
Speaker: Clara Draper (CIRES / NOAA ESRL PSD)
10:00 to 10:45 Integrated carbon cycle in reanalyses
Presentation slides
Video recording
Speaker: Anna Agusti-Panareda (ECMWF)
10:45 to 11:15 Coffee break
11:15 to 12:00 Development of coupled atmosphere-ocean data assimilation: Achievements and a perspective
Presentation slides
Video recording
Speaker: Yosuke Fujii (JMA/MRI)
12:00 to 12:45 Exploiting interface observations in a coupled reanalysis system
Presentation slides
Video recording
Speaker: Phil Browne (ECMWF)
12:45 to 13:15 Discussion and final remarks
Video recording
Speaker: Hans Hersbach (ECMWF)
Speaker: Paul Poli (ECMWF/C3S)