Climate and Atmospheric Science - Deposition: An Example, Illinois State Water Survey

Climate and Atmospheric Science

Deposition: An Example

Michael Caughey

Historic Stone Building in Downtown Philadelphia

Scientists studying the degradation rates of stone materials outdoors measure and model natural and pollution-related degradation processes and their effects on buildings such as this one (Figure 7a). Notice that the structural features in Figure 7b are much sharper than those in Figure 7c, which are more rounded due to degraded edges. These types of studies require measuring the wet and dry deposition of natural and pollutant chemicals. Meteorological variables such as solar radiation, temperature, relative humidity and condensation of moisture, measured with inches of the surfaces shown in Figures 7b and 7c, are also important in understanding the rates at which surfaces degrade outdoors.

Click on a photo to view a larger version.

   Deposition - Historic stone building in downtown Philadelphia.
Deposition - Back side of the upper portion of one of the stone columns in Fig 7a.
Fig 7b.
Deposition - Front side of the column shown in Figure 7b.
Fig 7c.

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