Large amounts of dust are emitted to the atmosphere from deserts, especially during high wind periods. Most of these particles are coarse (Dp > 1 pm), and many are deposited close to their source; some fraction of the smaller particles can be transported over large distances (Prospero, 1990). For example, dust from the Sahara is regularly detected on Barbados Island across the Atlantic Ocean (Andreae, 1995). The chemical composition of desert aerosol reflects its soil source and is often rich in calcium compounds and other alkaline elements.
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