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ESiWACE Motivation: Convection Resolving Simulations

Convection resolving ICON simulation

The animation shows convection resolving ICON simulations over the tropical Atlantic accompanying the NARVAL campaigns (by Daniel Klocke, DWD and Matthias Brueck, MPI-M). Emergent phenomena are featured in unprecedented detail, ranging from cold-pools of small cumuli, interacting squall lines of deep convection to hurricanes evolving from breaking easterly waves. Over 40 days are already simulated within the period of NARVAL-I (Dec 2013) and NARVAL-II (Aug 2016). The model resolution is 2.5 km with a nested domain of 1.2 km over the western part of the domain. These results are further used as input to large-eddy simulations with ICON within the HD(CP)2 project.

A major goal of ESiWACE consists in providing prototypical demonstrators to carry out these kinds of simulations at global scale.


Global 2.5km Simulations

R2B10 (2.5km resolution) ICON NWP simulation after 26h of execution. Start date is the 11 Aug 2016.

The picture shows the state of a 2.5km global numerical weather prediction run using the ICON model after 26h of simulation time. Below, you find an animation of the first 24 hours of the simulation.


Global 5km Simulations


The video shows a 3-week simulation (including start-up phase) of a global 5km ICON-based NWP simulation.


Global and Local High-Resolution Simulations

The video above shows results on global storm-resolving and large-domain Large-Eddy simulations with ICON LEM. Results are based on the projects ESiWACE and HD(CP)2.


Feasibility Study: Weather Forecasts with ICON and IFS

Performance of IFS and ICON in global NWP simulations

The graph shows the number of forecast days per compute day that can be achieved by global ICON and IFS models (no I/O). 


Parallel Performance of ICON


The graph shows the parallel performance of the ICON software using ECHAM physics on a 5km-resolution aqua-planet experiment. Good strong scalability is observed on the partition compute2 hosted at DKRZ. Find out more about ICON scalability and benchmarking here.


Coupled Systems with EC-Earth

Check out a 16km-resolved coupled EC-Earth simulation (ORCA12-T1279 setup), invoking NEMO and IFS.


Coupled Systems: Sea-Ice Extent

Check out an animation of a simulation of the arctic sea-ice extent over the years 1994-2003. The simulation was carried out using the CERFACS-HR model.

Coupled Systems: Atmosphere-Ocean Circulation Model

Check out a single-member atmosphere-ocean simulation of the north-Atlantic ocean region (temperature distribution over the years 1993-2000).


ESiWACE: WP4 (Exploitability) @SC16

ESiWACE participated in Supercomputing 2016 in Salt Lake City, Utah.

Find out more about modeling and simulation of tape libraries (WP4 of ESiWACE) here (poster, pdf).

Check out a short paper on middleware for earth system data here. This contribution was submitted and accepted as short paper at the International Workshop on Parallel Data Storage and Data Intensive Scalable Computing Systems, held in conjunction with SC16.

Architecture overview for ESD middleware

Architecture overview for earth system data middleware; taken from the short paper.



ESiWACE and the ESCAPE project are closely linked with regard to HPC efforts and scalability. Find out more about their link and the ESCAPE project here and in this press release, and in this brochure.


Upcoming Events
UCP2019: Understanding clouds and precipitation Feb 25, 2019 - Mar 01, 2019 — Harnack Haus, Berlin
ESiWACE Meeting 2019: ESiWACE annual meeting and ESiWACE2 kickoff Mar 11, 2019 - Mar 13, 2019 — Hamburg (DE)
EGU 2019 Apr 07, 2019 - Apr 12, 2019 — Vienna (AT)
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