Increasing stoichiometric imbalance in North America's largest lake: Nitrification in Lake Superior

Details Increasing stoichiometric imbalance in North America's largest lake: Nitrification in Lake Superior Increasing stoichiometric imbalance in North America's largest lake: Nitrification in Lake Superior

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410406s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10406

Physics

2

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Biosphere/Atmosphere Interactions (0315), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Biogeosciences: Limnology (1845, 4239, 4942), Biogeosciences: Nitrogen Cycling

Scientific paper

Lake Superior has exhibited a continuous, century-long increase in nitrate whereas phosphate remains at very low levels. Increasing nitrate and low phosphate has led to a present-day severe stoichiometric imbalance; Lake Superior's deepwater NO3 -:PO4 3- molar ratio is 10,000, more than 600 times the mean requirement ratio for primary producers. We examine the rate of [NO3 -] increase relative to budgets for NO3 - and fixed N. Nitrate in Lake Superior has continued to rise since 1980, though possibly at a reduced rate. We constructed whole-lake NO3 - and N budgets and found that NO3 - must be generated in the lake at significant rates. Stable O isotope results indicate that most NO3 - in the lake originated by in-lake oxidation. Nitrate in the lake is responding not just to NO3 - loading but also to oxidation of reduced forms of nitrogen delivered to the lake. The increasing [NO3 -]:[PO4 3-] stoichiometric imbalance in this large lake is largely determined by these in-situ processes.

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