system, users can build a specific CTM that may include all

or some of the critical science processes, such as

atmospheric transport, deposition, cloud mixing, emissions,

gas- and aqueous-phase chemical transformations, and

aerosol dynamics and chemistry.

We define the levels of modularity in the science model

based on the granularity of the modeling components. The

coarsest level of modularity is the distinction between the

system framework and science models. The second level is

the division of science sub-models. The third level of

modularity involves classes that include driver module,

processor module, data provider module, and utility module

(a collection of assisting subroutines) in the CTM. The

fourth level of modularity is based on the computational

functionality in a processor module, e.g., science

parameterization, numerical solver, processor analysis, and

input/output routines. The next meaningful modularization

level is the isolation of sections of code that can benefit from

machine dependent optimization. While the emissions

processing and the meteorology model are modular at the

second level, the CCTM achieves the fourth-level

modularity by employing the operator splitting, or fractional

time step, concept in the science processes. The CMAQ

codes are archived based on the science process classes that

are identified at the third and/or fourth modularity level.

The CCTM modules are divided into classes that provide

necessary functions for the module integration, science

processes, and data provider modules supplying information

such as photolysis rates and aerosol dry deposition

velocities, and others. Refer to Table 2 for the description

of the science classes and subroutines called by the CMAQ




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