The OASIS4 Coupler

Contents

Overview

As the climate modelling community is progressively targeting higher resolution climate simulations run on massively parallel platforms with coupling exchanges involving a higher number of (possibly 3D) coupling fields at a higher coupling frequency, a new fully parallel coupler OASIS4 has been developed within PRISM. The concepts of parallelism and efficiency drove OASIS4 developments, at the same time keeping in its design the concepts of portability and flexibility that made the success of OASIS3.

During the run, OASIS4 Driver extracts the configuration information defined by the user in XML files and organizes the process management of the coupled simulation. OASIS4 Transformer performs, in a fully parallel mode, the interpolation of the coupling fields. OASIS4 supports 3D and 2D coupling fields. To interact with the rest of the coupled model, the component models have to include specific calls to the OASIS4 PRISM System Model Interface Library (OASIS4 PSMILe), which, at runtime performs fully parallel the MPI-based exchanges of coupling data including automatic repartitioning, either directly or via additional Transformer processes, and file I/O using the GFDL mpp_io library. The OASIS4 PSMILe Application Programming Interface (API) was kept as close as possible to OASIS3 PSMILe API. This should ensure a smooth and progressive transition between OASIS3 and OASIS4 use in the climate modelling community.

OASIS4 portability and scalability have been demonstrated with different "toy" models. OASIS4 is currently in a beta testing phase and a full public version should be available to the general public by the end of the year. The beta tests include:

  • A real ocean model MOM4 successfully coupled with toy atmosphere model via OASIS4 in collaboration with GFDL.
  • The Institute for Marine Science at the Research Center for Marine Geosciences (IFM-GEOMAR) using OASIS4 with pseudo models to interpolate high resolution data onto high resolution model grids.
  • 3D coupling between atmospheric dynamic and chemistry models within the EU FP6 GEMS project.
  • Ocean-atmosphere regional coupling by the Swedish Meteorological and Hydrological Institute (SMHI)
  • Ocean-atmosphere global coupling by the UK MetOffice.

 

Download

As OASIS4 is currently in a beta testing phase, there is no official version publicly available for download. If you are interested to act as a beta tester, please contact us.

Getting Started

As OASIS4 is currently in a beta testing phase, there is no official "Getting Started" page.

 

Development site

More information on current developments can be found here Links to external site.

 

Documentation and publications

The OASIS4 User Guide can be found here PDF Document

For peer reviewed publications, please see:
  • S. Valcke, D. Declat, R. Redler, H. Ritzdorf, T. Schoenemeyer, R. Vogelsang, 2004. The PRISM Coupling and I/O System. VECPAR'04, Proceedings of the 6th International Meeting, VOL. 1 : High performance computing for computational science, Universidad Politecnica de Valencia, Valencia, Spain.
  • S. Valcke, E. Guilyardi, C. Larsson, 2005. PRISM and ENES: A European approach to Earth system modelling. Concurrency Computat.: Pract. Exper., 17:1-16
  • Redler, R., Valcke S. and Ritzdorf H., 2010. OASIS4 -- a coupling software for next generation earth system modelling. Geosci. Model Dev., 3, 87-104 (on-line access)

 

Presentations and Demos

For presentations, please see the "Conferences and Workshop" section of the development web site.

 

Reference and contact

If you feel that your research has benefited from the use of the OASIS4 software, we will greatly appreciate your reference to the following report:
"Redler, R., Valcke S. and Ritzdorf H. OASIS4 -- a coupling software for next generation earth system modelling. Geosci. Model Dev., 3, 87-104, 2010"

For more information, please contact .


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