Multimedia urban model

The multimedia urban model (MUM) is a fugacity-based mass balance model that treats the movement of POPs in an urban environment and links emissions to ambient chemical concentrations, and thus outdoor exposure (Diamond et al., 2001). MUM considers longterm, average conditions of chemical transport and transformation among six environmental compartments in urban areas (air, soil, surface water, sediment, vegetation and surface film see Figure 6.1) shows a concepmal version of the model). The model does not estimate event-specihc processes as do meteorological-based air or stormwater models. 

Figure 6.1 Conceptual model derived from the multimedia urban model (MUM) of contaminant emissions, transformation and transport in and from urban areas...

Kwamena, N.O.A., Clarke, J.P., et al (2007) Assessing the importance of heterogeneous reactions of polycyclic aromatic hydrocarbons in the urban atmosphere using the multimedia urban model. Atmospheric Environment, 41(1) 37-50. 

Priemer, D.A., Diamond, M.L. (2002) Application of the multimedia urban model to compare the fate of SOCs in an urban and forested watershed. Environmental Science and Technology, 36(5) 1004-1013. 

FIGURE 19.10 Concentrations (molm of PCB congeners CB-28 and CB-180 estimated in the compartments of the multimedia urban model of Toronto, Canada. 

In this chapter, we have explored the mechanism behind the high mobility of chemicals emitted into lu ban areas. Films on impervious siu faces, and of course the surfaces themselves, promote high export rates of emitted chemicals by air advection or transfer of atmospherically deposited chemicals into siu face waters via storm water runoff, rather than sequestration in the urban environment itself. We illustrate this quantitatively using the ftigacity-based multimedia lu ban model or MUM (Diamond et al., 2001 Priemer and Diamond, 2002 Jones-Otazo et al., 2005 Diamond et al., 2010). MUM is a seven-compartment fugacity Level HI model. The model is coded in Visual Basic and is run on a PC in a Windows environment. 

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