The following points are considered in development of dcpam.
Dcpam will be able to download from
GFD Dennou Club www server.
For academic and educational purposes, use, copy and modification of
dcpam are permitted as long as you don't try to pretend that you wrote
Fortran90 is introduced: suitable program language for sharing and
handing down the source code
In order to realize suitable program structure for sharing and handing
down the model, Fortran 90 is introduced as a program language. In
writing the source code, we will follow
Japan Meteorological Agency Fortran 90 coding rule to improve the
readability of source code. Thereby, sharing and handing down dcpam
are expected to become easy.
To be applied for the planetary atmosphere (ex. Mars, Venus):
In order to make dcpam easily apply to the Earth, Mars, and Venus
atmosphere, the structural programming is required in writing the
source code. The source code of dcpam is composed of three type
subroutines: the application routine which calculates physical
process, the common routine which does not have to be changed and
modified in applying to each planet, and the lower routine which
performs subcontract work of the common routine. The Fortran 90 module
is useful for realizing these program structure with ease.
Furthermore, the link method of each subroutine and parameter input
are considered so that it is not necessary to recompile in changing of
planetary parameter and exchanging physical processes. It will result
in large improvement in efficiency of various parameter and sensitivity
studies by use of GCM.
- Easy generation of reduced system models:
In understanding results of GCM simulation, it is effective to compare
the result of GCM with that of reduced system model which is reduced
spatial dimension or simplified particular physical process of GCM.
We consider automatic generation of such a reduced system model from
GCM by only changing the argument of make program, as "make 1D". The
reduced system models now considerd are 1 dimensional model (radiative
convective model and energy balance mode) and 2 dimensional
Incorprating network transparent data structure:
In the case that the computer architecture which performs program
execution and its data analysis differs from each other, it is prefer
that the data structure has network transparency which can cover the
difference of computer architecture. Moreover, the numerical
simulation data can be circulated through the network like observation
date if self-descriptiveness is given to the numerical simulation
data. We try to give these characters to the date structure of dcpam
by use of
- High portability which guarantees
execution of dcpam on various type computers:
In order to utilize a numerical model as educational resources, high
portability which guarantees execution of the model on various type
computers is required. The architectures considered as a platform of
dcpam are Intel 80386 system (Windows and Linux) and supercomputer
produced by HITACHI, Fujitsu and NEC. For the other architecture, we
try to improve portability of dcpam by following Fortran 90 standard
conventions as well as possible.
detail documents of the model:
Many documents required for the software as educational resources are
prepared: code reference which can be useful for reading and learning
the source code, installation and execution guide, sample experiment
collection which shows fundamental performance of the model. Thereby,
the user of dcpam can study atmospheric general circulation and
perform numerical experiment by himself.