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Fifth Workshop on Coupling Technologies for Earth System Models (CW2020)

last modified Dec 09, 2020 05:32 PM

The 5th Workshop on Coupling Technologies for Earth System Models (CW2020) was held virtually on September 21st-24th 2020, with one session of 3.5 hours each day, starting at 15h00 (Paris time).


The workshop aims to bring together leading researchers and practitioners in the field of coupling infrastructure for Earth System Models. This workshop is the fifth in the series, started in 2010 in Toulouse and followed by Boulder USA (2013), Manchester UK (2015), and Princeton USA (2017). Topics relevant to the workshops include, but are not limited to:

  • Coupling technology latest developments
  • Use of Coupling Technologies in ESMs: successes and failures, original or ground-breaking applications
  • Performance of Couplers and Coupled Systems
  • Science of Coupling and Coupling Strategies
  • Data assimilation for coupled NWP and Earth System Models
  • Integration of coupling technologies into workflows
  • Coupling software process: code management for coupled system, continuous integration, testing, etc.



  • Session 1: Coupling technology latest developments I
Latest developments of the OASIS3-MCT coupler for improved performance, Sophie Valcke
Update on the Earth System Modeling Framework, Rocky Dunlap
C-Coupler2: a flexible and user-friendly community coupler for model coupling and nesting, Li Liu
Update on YAC and an introduction to ICON-ESM, Moritz Hanke
  • Session 2: Coupling technology latest developments II

Couplers for E3SM: Comparisons between a fully online vs an offline-online remapping workflow, Vijay Mahadevan

Earth System Modeling Framework Regridding Update, Robert Oehmke
esm-interface, Nadine Wieters
The Oceanographic Multipurpose Software Environment: introduction and applications, Inti Pelupessy

Fast GCM - ice sheet model coupling software OBLIMAP 2.0, including on-line embeddable mapping routines, Thomas Reerink

  • Session 3: Coupling models in practice I
EC-Earth 4: Flexible coupling ESM components for practical use, Uwe Fladrich

The two-way online-coupled model ICONGETM: Regridding strategy and capabilities provided by the X-Grid structure from ESMF, Tobias Bauer

CMEPS: Community Mediator for Earth Prediction Systems, Mariana Vertenstein
  • Session 4 - Computational performances of coupled models
Process and Thread Affinity with MPI/OpenMP, Yun He
HW topology management in Message-Passing based parallel applications, Guillaume Mercier
Adaptive Parallelism for Coupled, Hybrid Programs, Samuel K. Gutierrez
Task Parallel Runtimes and Algorithmic Improvements for Coupled Earth System Models, Phil Jones
Computational coupling cost evaluation: Challenges and solutions for the new generation of Earth System Models, Mario Acosta
  • Session 5: Data Assimilation and NWP
Ocean-Wave-Atmosphere coupling with SURFEX and OASIS for mesoscale simulations and numerical weather prediction of tropical cyclones, Sylvie Malardel
The development of coupled NWP forecasting at the Met Office and ocean forecast systems, Dan Copsey
Efficient Ensemble Data Assimilation for Earth System Models with the Parallel Data Assimilation Framework, Lars Nerger
Coupling requirements for various flavours of coupled variational data assimilation at ECMWF, Phil Browne
Coupled atmosphere-ocean data assimilation system in the Canadian global prediction system, Sergey Skachko
  • Session 6: Coupling models in practice II

Modular System for Shelves and Coasts (MOSSCO) - Science applications, unstructured representations, and particle dynamics, Carsten Lemmen

Improving the river outflow coupling in a global climate model, Aurore Voldoire
New Capabilities in MAPL, Tom Clune
The Unified Forecast System (UFS); using community modeling to improve operations at NOAA, Hendrik Tolman
Coupling in the Navy Earth System Prediction Capability (Navy-ESPC) global coupled model, Neil Barton
  • Session 7: Coupling models in practice III
Coupling a moving-mesh to a fixed grid, Einar Olason
Moving the boundaries: coupling interactive ice sheets in UKESM, Robin Smith
An assessment of potential climate impact during 1948- 2010 using historical land use land cover change maps, Nagaraju Chilukoti
Coupling Hydrological models through eWaterCycle, Niels Drost
A New Atmosphere-Land Coupling in TerrSysMP: ICON and CLM3.5, Slavko Brdar
  • Session 8: Coupled model workflows
ESM-Tools - A tool for Earth System Modelling, Deniz Ural
CMIP6 at IPSL: a 4-year journey, Arnaud Caubel
Coupled model control systems: Problems = Opportunities, Richard Hill

 The CW2020 Organising Committee

The CW2020 Organising Committee is composed of:

  • V. Balaji, Princeton Cooperative Institute for Modeling the Earth System (CIMES) & Laboratoire de Sciences de Climat et Environnement (LSCE)
  • Tony Craig, Software Consultant
  • Rocky Dunlap, National Center for Atmospheric Research
  • Steve Easterbrook, University of Toronto
  • Robert Jacob, Argonne National Laboratory
  • Bert Jagers, Deltares
  • Li Liu, Tsinghua University
  • Kristian Mogensen, ECMWF
  • Jean-Christophe Rioual, UK Met Office
  • Sophie Valcke, Cerfacs
  • Mariana Vertenstein, National Center for Atmospheric Research


This workshop is funded by the EU H2020 IS-ENES3 project

Contact: Sophie.Valcke[@]cerfacs.fr .