Based on the fifth phase of the Coupled Model Intercomparison Project (CMIP5)-generation previous... more Based on the fifth phase of the Coupled Model Intercomparison Project (CMIP5)-generation previous Institut Pierre Simon Laplace (IPSL) Earth system model, we designed a new version, IPSL-CM5A2, aiming at running multi-millennial simulations typical of deep-time paleoclimate studies. Three priorities were followed during the setup of the model: (1) improving the overall model computing performance, (2) overcoming a persistent cold bias depicted in the previous model generation and (3) making the model able to handle the specific continental configurations of the geological past. These developments include the integration of hybrid parallelization Message Passing Interface - Open Multi-Processing (MPI-OpenMP) in the atmospheric model of the Laboratoire de Meteorologic Dynamique (LMDZ), the use of a new library to perform parallel asynchronous input/output by using computing cores as "I/O servers" and the use of a parallel coupling library between the ocean and the atmospheri...
Bulletin of the American Meteorological Society, 2019
We present a model intercomparison project, LongRunMIP, the first collection of millennial-length... more We present a model intercomparison project, LongRunMIP, the first collection of millennial-length (1,000+ years) simulations of complex coupled climate models with a representation of ocean, atmosphere, sea ice, and land surface, and their interactions. Standard model simulations are generally only a few hundred years long. However, modeling the long-term equilibration in response to radiative forcing perturbation is important for understanding many climate phenomena, such as the evolution of ocean circulation, time- and temperature-dependent feedbacks, and the differentiation of forced signal and internal variability. The aim of LongRunMIP is to facilitate research into these questions by serving as an archive for simulations that capture as much of this equilibration as possible. The only requirement to participate in LongRunMIP is to contribute a simulation with elevated, constant CO2 forcing that lasts at least 1,000 years. LongRunMIP is an MIP of opportunity in that the simulat...
Earth System science in general is based upon modelling and observations. The bulk of the raw dat... more Earth System science in general is based upon modelling and observations. The bulk of the raw data model output and Earth observation data is stored in a few centres, distributed over Europe and worldwide. The scientists in principle rely on the avail-ability of easy and transparent access to these data-bases, which is not given today for different reasons: National boundaries, different structures of the archives, non-standard data formats, inconsistent access management are a few of them. Earth System Modelling is an extremely data intensive field of science. Typical archive sizes presently are on the order of a few hundred Terabyte with a rapid growing rate. Successful modelling and prediction of the Earth System relies heavily on the availability of these huge data sets for boundary and initial conditions from observations and other model studies, and on comparison with the output of other model studies. ENES tries to solve the parts of the data problems by the following activit...
The tracer transport model implemented in OPA deals with passive tracers, which are transported b... more The tracer transport model implemented in OPA deals with passive tracers, which are transported by but do not affect ocean circulation. These contrast with active tracers such as temperature and salinity that feedback on ocean dynamics. The tracer transport model computes the evolution of passive tracers either “on-line” along with the dynamics, or “off-line“ using fields of advection and diffusion that have been previously calculated and stored to disk. Passive tracers in the ocean are typically biogeochemical, biological or radioactive. They are transported by the oceanic circulation, but they may in nature also degrade or interact with one another. Typically, the associated "Source-Minus-Sink" (SMS) terms are also included in the transport equation and depend upon the application.
The increasing complexity of Earth system models (ESMs) and computing facilities puts a heavy tec... more The increasing complexity of Earth system models (ESMs) and computing facilities puts a heavy technical burden on the research teams active in climate modelling. PRISM provides the Earth System Modelling community with a forum to promote sharing of development, ...
Based on the fifth phase of the Coupled Model Intercomparison Project (CMIP5)-generation previous... more Based on the fifth phase of the Coupled Model Intercomparison Project (CMIP5)-generation previous Institut Pierre Simon Laplace (IPSL) Earth system model, we designed a new version, IPSL-CM5A2, aiming at running multi-millennial simulations typical of deep-time paleoclimate studies. Three priorities were followed during the setup of the model: (1) improving the overall model computing performance, (2) overcoming a persistent cold bias depicted in the previous model generation and (3) making the model able to handle the specific continental configurations of the geological past. These developments include the integration of hybrid parallelization Message Passing Interface - Open Multi-Processing (MPI-OpenMP) in the atmospheric model of the Laboratoire de Meteorologic Dynamique (LMDZ), the use of a new library to perform parallel asynchronous input/output by using computing cores as "I/O servers" and the use of a parallel coupling library between the ocean and the atmospheri...
Bulletin of the American Meteorological Society, 2019
We present a model intercomparison project, LongRunMIP, the first collection of millennial-length... more We present a model intercomparison project, LongRunMIP, the first collection of millennial-length (1,000+ years) simulations of complex coupled climate models with a representation of ocean, atmosphere, sea ice, and land surface, and their interactions. Standard model simulations are generally only a few hundred years long. However, modeling the long-term equilibration in response to radiative forcing perturbation is important for understanding many climate phenomena, such as the evolution of ocean circulation, time- and temperature-dependent feedbacks, and the differentiation of forced signal and internal variability. The aim of LongRunMIP is to facilitate research into these questions by serving as an archive for simulations that capture as much of this equilibration as possible. The only requirement to participate in LongRunMIP is to contribute a simulation with elevated, constant CO2 forcing that lasts at least 1,000 years. LongRunMIP is an MIP of opportunity in that the simulat...
Earth System science in general is based upon modelling and observations. The bulk of the raw dat... more Earth System science in general is based upon modelling and observations. The bulk of the raw data model output and Earth observation data is stored in a few centres, distributed over Europe and worldwide. The scientists in principle rely on the avail-ability of easy and transparent access to these data-bases, which is not given today for different reasons: National boundaries, different structures of the archives, non-standard data formats, inconsistent access management are a few of them. Earth System Modelling is an extremely data intensive field of science. Typical archive sizes presently are on the order of a few hundred Terabyte with a rapid growing rate. Successful modelling and prediction of the Earth System relies heavily on the availability of these huge data sets for boundary and initial conditions from observations and other model studies, and on comparison with the output of other model studies. ENES tries to solve the parts of the data problems by the following activit...
The tracer transport model implemented in OPA deals with passive tracers, which are transported b... more The tracer transport model implemented in OPA deals with passive tracers, which are transported by but do not affect ocean circulation. These contrast with active tracers such as temperature and salinity that feedback on ocean dynamics. The tracer transport model computes the evolution of passive tracers either “on-line” along with the dynamics, or “off-line“ using fields of advection and diffusion that have been previously calculated and stored to disk. Passive tracers in the ocean are typically biogeochemical, biological or radioactive. They are transported by the oceanic circulation, but they may in nature also degrade or interact with one another. Typically, the associated "Source-Minus-Sink" (SMS) terms are also included in the transport equation and depend upon the application.
The increasing complexity of Earth system models (ESMs) and computing facilities puts a heavy tec... more The increasing complexity of Earth system models (ESMs) and computing facilities puts a heavy technical burden on the research teams active in climate modelling. PRISM provides the Earth System Modelling community with a forum to promote sharing of development, ...
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Papers by M. Foujols