Table 2.
Summary of parameters required to calculate the dry deposition over GI surfaces.
| Resistance | Meteorological parameters | Topographical parameters | GI parameters | Pollutant parameters | 
|---|---|---|---|---|
| Ra | Temperature; density of air; Specific heat; sensible heat; Friction velocity; Wind speed and direction | Terrain data; Building geometry | - | Source location and elevation; Source outlet velocity; Source geometry | 
| Rb | Kinematic viscosity; Thermal conductivity; Air dynamic viscosity; Temperature; Cunningham factor, particle relaxation time, thermal conductivity; Heat capacity per unit volume | Land cover/use data; Surface roughness | - | Molecular diffusivity; particle diameter | 
| Rs | Air temperature, solar radiation; Solar elevation angle; Diffusion and directbeam solar radiation; Conductance-reducing effects of air temperature | The angle between the leaf and the sun | Photosynthetically Active Radiation (PAR); Leaf water potential; vapour pressure deficit, LAI; Water vapour pressure deficit; | Molecular diffusion | 
| Rm | - | - | Net photosynthesis rate per leaf area; Type of species, | Henry law constant; Absolute temperature, gas constant | 
| Rlu | Atmospheric acids; Ambient air temperature; Relative humidity; Seasonal conditions, | - | The thickness and chemical composition of leafsurface water-layer; LAI; Pollutant concentration over leaf; Cuticle surface area; Formation, growth and fate of water films; Type of species; Age of leaf | Pollutant concentration; Rate of pollutant interaction, pollutant composition, | 
| Rdc | Solar radiation; Solar elevation angle | Slope of the local terrain | - | - | 
| Rcl | - | - | Bark area index; Porosity; Areal density; Stem area | Henry law constant; Absolute temperature; Gas constant, reactivity factor for gases; Baseline lower canopy resistance for SO2 and O3 | 
| Rac | Friction velocity; Wind speed and direction | - | Canopy height; Leaf area Index | - | 
| Rgs and Rsoil | Relative humidity; Ambient concentration of air pollutant and solar radiation | pH value of soil; Soil moisture content | - | - | 
| Rb (for particles) | Schmidt number; Air kinematic viscosity; Friction velocity; Air dynamic viscosity; Stokes number; Density of air; Ambient Temperature; Relative humidity | Surface rough; Land use cover | LAI; Height of canopy | Particle’s Brownian diffusivity; Cunningham factor; Particle’s settling velocity; particle relaxation time; Particle diameter; Particle density; | 
| Vs | Density of air; Gravitational acceleration; Air kinematic viscosity | - | - | Particle diameter; Particle density; Cunningham factor |