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Modeling of the 1900-1980 trend of precipitation acidity at Hubbard Brook, New Hampshire

, : Modeling of the 1900-1980 trend of precipitation acidity at Hubbard Brook, New Hampshire. Atmospheric Environment 20(9): 1825-1828

Sulfate and nitrate concentrations in precipitation from 1900 to 1980 at Hubbard Brook, New Hampshire are modeled using constant meteorology but annually varying emission strength. The contribution of U.S. emissions to the annual average SO42- concentration increased steadily from 0.8 to 2.0 mg/l-1 between 1900 and 1920 but remained fairly constant afterwards. The NO3- concentration increased steadily from 0.25 to 1.3 mg/l-1 over the eight decades. Canada emissions in 1980 added about 17% to the sulfate and 7% to the nitrate concentrations. The estimated annual average pH of precipitation decreased from 4.7 in the beginning of the century to about 4.2 at present. These calculations are in good agreement with the measurements for the period 1964-1981.


DOI: 10.1016/0004-6981(86)90131-9

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