3. Accomplishments And Discussions
Transition of the 8-bin dust component into NMM-dust was performed by extending the NMM model through the development of an additional dust concentration module. Since the dust component has a similar (mass conserving) structure as, for example, the equation for specific humidity in NMM-dust, dust and specific humidity were handled similarly. They differ in the deposition (source) and emission (sources) as parts specific for dust. These two components were done in a separate routine, following the way of parameterization in the 8-bin code. The two models (8-bin and NMM-dust) are initially tested by comparing to the PHAiRS project's 4-bin code and matched the results in principle. The 8-bin and NMM-dust models are utilized for model interoperability studies and yield good results. Initial tests within the project have been performed with the DREAM-eta 4 bin system (Nickovic et al. 2001). In this system, DREAM model dust particle distribution is described with 4 sizes, ranging in radius from 0.7 - 40 µm. Since the hydrostatic NCEP/Eta cannot be applied with resolution higher than ~ 5km in horizontal, in the next step we replaced the NCEP/Eta with the Nonhydrostatic NCEP/NMM (Janjic et al., 2001) that may be used in a high resolution mode. At the same time NCEP/NMM has a possibility to be run in a parallel execution mode, which is not the case with NCEP/Eta. Theoretical thoughts was made to transfer the DREAM8 component (Nickovic, 2004; Nickovic 2005; Peres et al., 2006) into the NCEP/NMM, DREAM8 being the dust model version that resolves dust particle distribution with 8 particle bins ranging from submicron radius to 10 µm. Smaller particles are used in the project having in mind that such particle size range is more appropriate for possible future use of the modeling system for public health. Incorporating the knowledge gained, we developed the NMM-dust model in the project.
3.3 Future Research Topics