The chemical composition of rainwater reflects the sources contributing dissolved ions and particulates to the atmosphere: sea-salt aerosols contribute chloride, sodium, magnesium, and sulfate (marine source); crustal/soil dust contributes aluminum, iron, silicon, calcium, and associated cations (soil source); and combustion of fossil fuels contributes nitrate, ammonium, phosphate, potassium, and sulfate along with associated cations (anthropogenic combustion source).
Matching each rainwater chemical association to its source: association A (Cl-Na-Mg-SO4) is dominated by ions characteristic of sea-salt aerosol, identifying it as a marine source....
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