Air Chemistry

Air Chemistry - Air Chemistry Biogeochemistry: Berner &...

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Air Chemistry Atmospheric Gases 99.9%= nitrogen, oxygen and argon long residence time= occur in constant ratios to one another throughout the atmo. Not true for the other gases which are affected by changes in rates of input by natural processes Rainwater and Atmospheric Chemistry Chemical composition of rainwater Rainwater can be characterized as dilute(few mg/l dissolved salt) to weakly acidic (ph4-6) Dilution brought about by way rain forms Rainfall not always pure Soild particles and gases in the atmo. Are dissolved by rainwater which results in a wide range in chemical composition, as well as variations in pH. Need to consider: 1) concentrations of the various ions and 2) relative amount of ions (ion ratios) Dissolved chemical components of rainwater can be divided into two groups: 1) derived primarily from particles in the air- Na+, K+, Ca 2+, Mg2+, CL- and 2) derived mainly from atmospheric gases- SO42-, NH4+, NO3- Composition of condensation falling to ground as rainwater determined by the composition of nucleating aerosols and soluble trace gases that react with water during both the condensation
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Air Chemistry - Air Chemistry Biogeochemistry: Berner &...

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