Strategies for emission controls to mitigate snowmelt acidification

Details Strategies for emission controls to mitigate snowmelt acidification Strategies for emission controls to mitigate snowmelt acidification

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220401c&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20401

Physics

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Cryosphere: Biogeochemistry (0412, 0414, 1615, 4805, 4912), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912)

Scientific paper

Elevated atmospheric deposition of strong acids contributes to short-term/seasonal acidification of surface waters draining sensitive northern forests of North America and Europe during high flow. Reducing atmospheric deposition of NO3- and/or SO42-, therefore, could improve the health of aquatic ecosystems by mitigating episodic acidification. We used an integrated biogeochemical model (PnET-BGC) to simulate the effects of acidic deposition on seasonal variations in surface water chemistry, and to evaluate emission control scenarios to decrease acidification during snowmelt. Model calculations suggest that historical long-term inputs of acidic deposition have altered the seasonal patterns in surface water chemistry. Although short-term increases in NO3- coincide with snowmelt acidification, model simulations indicate reductions in SO42- deposition result in larger benefits than an equivalent reduction in NO3- deposition. Year-around reductions in NO3- deposition are also more beneficial to the acid-base status of stream water than summer-only reductions.

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