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The Model Coupling Toolkit: A New Fortran90 Toolkit for Building Multiphysics Parallel Coupled Models

Jay Larson, Robert Jacob, Everest Ong
2005 The international journal of high performance computing applications  
We describe the package we developed-the Model Coupling Toolkit (MCT)-to meet these general requirements and the specific requirements of a parallel climate model.  ...  The computational complexity of individual models, combined with the popularity of the distributed-memory parallel programming model used on commodity microprocessor-based clusters, results in a parallel  ...  We gratefully acknowledge source code contributions from Jing Guo of the NASA Global Modeling and Assimilation office, who designed MPEU and the original version of the AttrVect class; and Jace Mogill  ... 
doi:10.1177/1094342005056115 fatcat:tlmt5w2r2few3ezp3m7s4m544y

The COSMO-CLM 4.8 regional climate model coupled to regional ocean, land surface and global earth system models using OASIS3-MCT: description and performance

Andreas Will, Naveed Akhtar, Jennifer Brauch, Marcus Breil, Edouard Davin, Ha T. M. Ho-Hagemann, Eric Maisonnave, Markus Thürkow, Stefan Weiher
2017 Geoscientific Model Development  
</strong> We developed a coupled regional climate system model based on the CCLM regional climate model.  ...  Within this model system, using OASIS3-MCT as a coupler, CCLM can be coupled to two land surface models (the Community Land Model (CLM) and VEG3D), the NEMO-MED12 regional ocean model for the Mediterranean  ...  First of all, Irina Fast provided the solution for dedicated distribution of model tasks on cores and the MPI-ESM version using the OASIS3-MCT coupler.  ... 
doi:10.5194/gmd-10-1549-2017 fatcat:szroammf6ncgnkifctwn5k56re

Improving climate model coupling through a complete mesh representation: a case study with E3SM (v1) and MOAB (v5.x)

Vijay S. Mahadevan, Iulian Grindeanu, Robert Jacob, Jason Sarich
2018 Geoscientific Model Development Discussions  
Tools like Earth System Modeling Framework (ESMF) Hill et al. (2004) and TempestRemap Ullrich et al. (2013) offer capability to generate conservative remapping weights, while the Model Coupling Toolkit  ...  (MCT) Larson et al. (2001) that is utilized in many production climate models exposes functionality to make use of the operators to solve the coupled problem.  ...  N atm = N x /2 and N ocn = N x 15 (c) Disjoint-OCN model PE layout: N atm = N x and N ocn = N x /2 Figure 14 . 14 Scaling of the communication kernels driven with the parallel graph computed with a trivial  ... 
doi:10.5194/gmd-2018-280 fatcat:6yrgr7go6nfghdgelcukq6tkki

Improving climate model coupling through a complete mesh representation: a case study with E3SM (v1) and MOAB (v5.x)

Vijay S. Mahadevan, Iulian Grindeanu, Robert Jacob, Jason Sarich
2020 Geoscientific Model Development  
Tools like Earth System Modeling Framework (ESMF) (Hill et al., 2004) and TempestRemap (Ullrich et al., 2013) offer capability to generate conservative remapping weights, while the Model Coupling Toolkit  ...  (MCT) (Larson et al., 2001) that is utilized in many production climate models exposes functionality to make use of the operators to solve the coupled problem.  ...  Funding for this work was provided by the Climate Model Development and Validation -Software Modernization project, and partially by the SciDAC Coupling Approaches for Next Generation Architectures (CANGA  ... 
doi:10.5194/gmd-13-2355-2020 fatcat:ealxqvjzxzaf5k22fldepot32e

Malleable Model Coupling with Prediction

Daihee Kim, J. Walter Larson, Kenneth Chiu
2012 2012 12th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (ccgrid 2012)  
Performance studies of the new LBM using a simplified coupled model testbed similar to a coupled climate model show dramatic improvement (≈ 77%) in the LBM's convergence rate.  ...  The prediction system employs piecewise linear and cubic spline interpolation of timing measurements to guide constituent cohort resizing.  ...  For example, the Community Climate System Model (CCSM) [16] , [17] has ∆T = 1 model day.  ... 
doi:10.1109/ccgrid.2012.20 dblp:conf/ccgrid/KimLC12 fatcat:dn2yywk435czpgnwxn5div3aqa

A Multilevel Parallelism Support for Multi-Physics Coupling

Fang Liu, Masha Sosonkina
2011 Procedia Computer Science  
While this challenge has been a driving force in climate modeling for nearly a decade, fusion energy and space weather modeling are starting just now to integrate different sub-physics into a single model  ...  Task parallelism allows individual tasks to communicate and synchronize with each other through message passing or other mechanisms while data parallelism applies the same operation in parallel to different  ...  MCT addresses the inter-model, parallel communication requirements of Community Climate System Model (CCSM) and intra-model communication requirements of a distributed-memory parallel coupler.  ... 
doi:10.1016/j.procs.2011.04.028 fatcat:odfv76tstfe6ldqkjkwvlaifry

C-Coupler1: a Chinese community coupler for Earth system modeling

L. Liu, G. Yang, B. Wang, C. Zhang, R. Li, Z. Zhang, Y. Ji, L. Wang
2014 Geoscientific Model Development  
Targeting the requirements of 3-D coupling, high-level sharing, common model software platform and better parallel performance, we started to design and develop a community coupler (C-Coupler) from 2010  ...  C-Coupler1 is ready for Earth system modeling, and it is publicly available. In China, there are more and more modeling groups using C-Coupler1 for the development and application of models.</p>  ...  This work is supported in part by the Natural Science Foundation of China (no. 41275098), the National Grand Fundamental Research 973 Program of China (no. 2013CB956603), and the Tsinghua University Initiative  ... 
doi:10.5194/gmd-7-2281-2014 fatcat:ma43zkpel5flvig4kuwknlzwcy

A regional atmosphere-ocean climate system model (CCLMv5.0clm7-NEMOv3.3-NEMOv3.6) over Europe including three marginal seas: on its stability and performance

Cristina Primo, Fanni D. Kelemen, Hendrik Feldmann, Bodo Ahrens
2019 Geoscientific Model Development Discussions  
This work presents an atmosphere-ocean coupled regional climate system model (RCSM, with the atmospheric component COSMO-CLM and the ocean component NEMO) over the European domain, including three marginal  ...  The coupled system runs stable for the complete 20th century and provides a better representation of extreme temperatures compared to the atmosphere-only model.  ...  Christian Dieterich and other colleagues from SMHI for providing the NEMO-NORDIC model and to Dr. Naveed Akhtar from HZG for helping with the coupled set-up.  ... 
doi:10.5194/gmd-2019-73 fatcat:fi2dll2yqvcarjqlo3g5j5ayuy

Compact Modeling Framework v3.0 for high-resolution global ocean–ice–atmosphere models

Vladimir V. Kalmykov, Rashit A. Ibrayev, Maxim N. Kaurkin, Konstantin V. Ushakov
2018 Geoscientific Model Development  
The CMF3.0 is designed for use on high- and ultrahigh-resolution models on massively parallel supercomputers.  ...  </strong> We present a new version of the Compact Modeling Framework (CMF3.0) developed for the software environment of stand-alone and coupled global geophysical fluid models.  ...  The research of Sections 1-3, 5.1 and 5.2 was supported by the Russian Science Foundation (project no. 14-37-00053) and performed at the Hydrometeorological Research Center of the Russian Federation.  ... 
doi:10.5194/gmd-11-3983-2018 fatcat:z5yn6eexrbcypo7rcnwou5jroy

Using the Model Coupling Toolkit to couple earth system models

John C. Warner, Natalie Perlin, Eric D. Skyllingstad
2008 Environmental Modelling & Software  
Both coupled systems use the Model Coupling Toolkit (MCT) as a mechanism for operation control and inter-model distributed memory transfer of model variables.  ...  The basic system would entail model "1" running on "M" processors and model "2" running on "N" processors, with efficient exchange of model fields at predetermined synchronization intervals.  ...  Conclusions We used the Model Coupling Toolkit (MCT) to develop coupled modeling systems of MODEL1 running on ''M'' processors and MODEL2 running on ''N'' processors.  ... 
doi:10.1016/j.envsoft.2008.03.002 fatcat:xwmznfsp2ffdtmycevc6gzwvoq

A New Approach: Component-Based Multi-physics Coupling through CCA-LISI [chapter]

Fang Liu, Masha Sosonkina, Randall Bramley
2010 Lecture Notes in Computer Science  
This has been a driving force in climate modeling for nearly a decade now, and fusion energy, space weather modeling are starting to integrate different sub-physics into a single model.  ...  Through component-based software engineering, an interface supporting this coupling process provides a way to invoke the sub-model through the common interface which the top model uses, then a coupled  ...  This is so called M-by-N problem in the scientific coupling [12] community.  ... 
doi:10.1007/978-3-642-12165-4_40 fatcat:e3oxndwkkvcobigep3vywazmlm

A new adaptive data transfer library for model coupling

Cheng Zhang, Li Liu, Guangwen Yang, Ruizhe Li, Bin Wang
2016 Geoscientific Model Development  
In this paper, we reveal the drawbacks of the P2P implementation when the parallel decompositions of the sender and the receiver are different, including low communication bandwidth due to small message  ...  of processes used for running models is small.  ...  Introduction Climate system models (CSMs) and Earth system models (ESMs) are fundamental tools for simulating, predicting, and projecting climate.  ... 
doi:10.5194/gmd-9-2099-2016 fatcat:ywbnr2d2rrbcxcttstg2654frq

Integrated Modeling of the Battlespace Environment

T Campbell, R Allard, R Preller, L Smedstad, A Wallcraft, Sue Chen, Hao Jin, S Gaberšek, R Hodur, J Reich, Craig D Fry, Vince Eccles (+5 others)
2010 Computing in science & engineering (Print)  
Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications  ...  maintaining the data needed, and completing and reviewing the collection of information.  ...  In the coupler, however, we used DBuilder'' ; to interpolate between the two model grids.  ... 
doi:10.1109/mcse.2010.78 fatcat:kdex5tfskfgvdikd35qie4tglu

Performance modeling of HPC applications [chapter]

A. Snavely, X. Gao, C. Lee, L. Carrington, N. Wolter, J. Labarta, J. Gimenez, P. Jones
2004 Advances in Parallel Computing  
This paper describes technical advances that have enabled a framework for performance modeling to become practical for analyzing the performance of HPC applications.  ...  used in coupled climate models.  ...  This con guration is set up to be identical to the actual production con guration of the Community Climate System Model with the exception that the coupling to full atmosphere, ice and land models has  ... 
doi:10.1016/s0927-5452(04)80095-9 fatcat:xwebkgwu3rddzbmfwczjvahnra

Efficient ensemble data assimilation for coupled models with the Parallel Data Assimilation Framework: example of AWI-CM (AWI-CM-PDAF 1.0)

L. Nerger, Q. Tang, L. Mu
2020 Geoscientific Model Development  
Using only minimal changes in the codes of the different compartment models, a particularly efficient data assimilation system is generated that utilizes parallelization and in-memory data transfers between  ...  When used with coupled models of Earth system compartments, e.g., the atmosphere and the ocean, consistent joint states can be estimated.  ...  X a k = x f k 1 T N e + X f k w k 1 T N e + Wk , (1) where x f k is the forecast ensemble mean state and 1 N e is a vector of size N e holding the value one in all elements.  ... 
doi:10.5194/gmd-13-4305-2020 doaj:7143691aa35e4ea1a398c402954ebf4e fatcat:hsn54vbc4zcn3ikxprz6ddp4ce
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