- The Base Model Layer (BML):
At the final development state, this layer comprises
only a central time integration management and a run control
facility for the processes involved.
In the transition state (at present) the BML is the domain
specific model with all modularized parts removed.
For instance, in case of an
atmospheric model it is usually a GCM.
- The Base Model Interface Layer (BMIL),
which comprises basically three functionalities:
The BMIL therefore comprises the whole MESSy infrastructure
which is organized in so called generic submodels(see Appendix A).
- The central submodelmanagement interface allows the
base modelto control (i.e. to switch and call) the submodels.
- The data transfer/export interface organizes the data
transfer between the submodelsand the base modeland between different
submodels. It is furthermore responsible for the output of results
Based on the requirements of the model setup,
the data can be classified according to their use,
e.g., as physical constants, as time varying physical fields,
and as tracers (i.e., chemical compounds).
- The data import interface is used for flexible
(i.e., grid independent) import of gridded
initial and time dependent boundary conditions.
- The Submodel Interface Layer (SMIL):
This layer is a submodel-specific interface, which collects all relevant
information/data from the BMIL, transfers them via
parameter lists to the Submodel Core Layer (SMCL, see below),
calls the SMCL routines,
and distributes the calculated results from the parameter lists
back to the BMIL.
Since this layer performs the data exchange for the submodel, also
the coupling/feedback between different submodelsis managed within this
- The Submodel Core Layer (SMCL): This layer comprises the
self-consistent core routines of a submodel
(e.g., chemical integrations, physics,
parameterizations, diagnostic calculations, etc.), which are completely
independent of the implementation of the base model.
Information exchange is solely performed
via parameter lists of the subroutines. The output is completely
determined by the input.
Further details can be found in:
Patrick Jöckel, Rolf Sander, Astrid Kerkweg, Holger Tost,
and Jos Lelieveld,
Technical Note: The Modular Earth Submodel System (MESSy) -
a new approach towards Earth System Modeling,
Atmos. Chem. Phys., 5, 433-444,
SRef-ID: 1680-7324/acp/2005-5-433, 2005.
(-full text online (pdf)-)
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17 Dec 2009.
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