NLOAD : an interactive, web-based modeling tool for nitrogen management in estuaries
Bowen, Jennifer L.
Ramstack, Joy M.
MetadataShow full item record
KeywordBarnegat Bay; Coastal planning; Eutrophication; Management tool; Nitrogen loading; Nitrogen mitigation; Resource managers; Watershed–estuary coupling
Eutrophication of estuaries is an increasing global concern that requires development of new tools to identify causes, quantify conditions, and propose management options that address this environmental problem. Since eutrophication is often associated with increased inputs of land-derived nitrogen to estuaries, we developed NLOAD, a user-friendly, web-based tool that brings together six different published models that predict nitrogen loading to estuaries and two models that estimate nitrogen concentrations in coastal waters. Here we describe each of the models, demonstrate how NLOAD is designed to function, and then use the models in NLOAD to predict nitrogen loads to Barnegat Bay, New Jersey (USA). The four models that we used to estimate nitrogen loads to Barnegat Bay, when adjusted, all had similar results that matched well with measured values and indicated that Barnegat Bay receives roughly 26 kg N·ha−1·yr−1. Atmospheric deposition was the dominant source of nitrogen to Barnegat Bay, followed by fertilizer nitrogen. Wastewater in Barnegat Bay is diverted to an offshore outfall and contributes no nitrogen to the system. The NLOAD tool has an additional feature that allows managers to assess the effectiveness of a variety of management options to reduce nitrogen loads. We demonstrate this feature of NLOAD through simulations in which fertilizer inputs to the Barnegat Bay watershed are reduced. Even modest cutbacks in the use of fertilizers on agricultural fields and lawns can be shown to reduce the amount of N entering Barnegat Bay.
Author Posting. © Ecological Society of America, 2007. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 17, Supple. (2007): S17–S30, doi:10.1890/05-1460.1.
Suggested CitationEcological Applications 17, Supple. (2007): S17–S30
Showing items related by title, author, creator and subject.
Spartina alterniflora δ15N as an indicator of estuarine nitrogen load and sources in Cape Cod estuaries Kinney, Erin L.; Valiela, Ivan (2018-04)δ15N values of coastal biota have been used as indicators of land-derived N-loads and sources to estuarine systems and should respond predictably to differences in nitrogen and be sensitive to changes in nitrogen, preferably ...
The influence of anthropogenic nitrogen loading and meteorological conditions on the dynamics and toxicity of Alexandrium fundyense blooms in a New York (USA) estuary Hattenrath, Theresa K.; Anderson, Donald M.; Gobler, Christopher J. (2010-02-17)The goal of this two-year study was to explore the role of nutrients and climatic conditions in promoting reoccurring Alexandrium fundyense blooms in the Northport-Huntington Bay complex, NY, USA. A bloom in 2007 was ...
Ecological constraints on planktonic nitrogen fixation in saline estuaries. I. Nutrient and trophic controls Marino, Roxanne; Chan, Francis; Howarth, Robert W.; Pace, Michael L.; Likens, Gene E. (Inter-Research, 2006-03-15)Heterocystous, planktonic cyanobacteria capable of fixing atmospheric N2 into available nitrogen (N) are common and critically important to nutrient cycling in many lakes, yet they are rarely observed in estuaries at ...