Remote Sensing of Aerosols from Space: A Review of Aerosol Retrieval Using the Moderate-Resolution Imaging Spectroradiometer
Aerosols are solid or liquid airborne particulates of variable composition, which reside in stratied layers of the atmosphere. Generally, they are dened as atmospheric particles of sizes between about 0.1 and 10 μm, though the sizes of condensation nuclei are typically about 0.01 μm. Under normal conditions, most atmospheric aerosol exists in the troposphere. Natural sources such as dust storms, desert and soil erosion, biogenic emissions, forest and grassland res, and sea spray account for about 90% of aerosols, and the rest result from anthropogenic activity. The background (natural) tropospheric aerosols are temporally and spatially variable. The study of aerosols is important because of their effects on the Earth radiation budget, climate change, atmospheric conditions, and human health. Recent research has focused on ne aerosols due to their long-term damage to the respiratory system (Davidson, Phalen, and Solomon 2005; Dominici et al. 2006).