COASTAL LOADINGS OF NUTRIENTS

The transport of nitrogen from freshwaters to coastal waters has resulted in environmental concerns, such as eutrophication and depletion of oxygen. The SPARROW model provides estimates of mean-annual nutrient loadings to coastal waters. This information can help identify the relative contributions of different river basins to nutrient loads and where potential eutrophication may occur.

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In New England, estimated nitrogen loads to the coast are greatest from the Connecticut, Merrimack, and Kennebec Rivers, which are partly related to their large drainage size. Large annual nitrogen loads from the Connecticut, Providence, and the Housatonic Rivers make Long Island Sound especially vulnerable to nitrogen enrichment and eutrophication.

About New England SPARROW