EPA Science Inventory

Search Criteria: the term 'nitrogen OR phosphorus OR nutrient' in any part of any record.
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    Draft Plan for Development of the Integrated Science Assessment for Nitrogen Oxides - Health Criteria (ASSESSMENT DOCUMENT)
    EPA has announced a draft development plan for the next Integrated Science Assessment (ISA) for the health effects of nitrogen oxides (NOX) which will serve as the scientific basis for review of the primary (health-based) National Ambient Air Quality Standard for nitrogen dioxide...
    Integrated Science Assessment (ISA) for Oxides of Nitrogen – Health Criteria (First External Review Draft, 2013) (ASSESSMENT DOCUMENT)
    EPA is announcing the availability of the First External Review Draft of the <i>Integrated Science Assessment for Oxides of Nitrogen – Health Criteria</I> for public comment and independent peer review. This draft document provides EPA’s evaluation and synthesis of the most polic...
    Integrated Science Assessment (ISA) for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter - Ecological Criteria (First External Review Draft, Mar 2017) (CRITERIA DOCUMENT)
    This draft ISA document represents a concise synthesis and evaluation of the most policy-relevant science and will ultimately provide the scientific bases for EPA’s decision on retaining or revising the current secondary standards for NO2, SO2, PM 2.5 and PM 10 since the prior re...
    A modeling study examining the impact of nutrient boundaries on primary production on the Louisiana Continental Shelf (JOURNAL)
    A mass balance eutrophication model, Gulf of Mexico Dissolved Oxygen Model (GoMDOM), has been developed and applied to describe nitrogen, phosphorus and primary production in the Louisiana shelf of the Gulf of Mexico. Features of this model include bi-directional boundary exchan...
    New, national bottom-up estimate for tree-based biological nitrogen fixation in the US (PRESENTATION)
    Nitrogen is a limiting nutrient in many ecosystems, but is also a chief pollutant from human activity. Quantifying human impacts on the nitrogen cycle and investigating natural ecosystem nitrogen cycling both require an understanding of the magnitude of nitrogen inputs from biolo...
    Nitrogen input inventory in the Nooksack-Abbotsford-Sumas Transboundary Region: Key component of an international nitrogen management study. (PRESENTATION)
    Background/Question/Methods: Nitrogen (N) is an essential biological element, so optimizing N use for food production while minimizing the release of N and co-pollutants to the environment is an important challenge. The Nooksack-lower Fraser Valley, spanning a portion of the w...
    Development of an epiphyte indicator of nutrient enrichment. A critical evaluation of observational and experimental studies (JOURNAL)
    An extensive review of the literature on epiphytes on submerged aquatic vegetation (SAV), primarily seagrasses but including some brackish and freshwater rooted macrophytes, was conducted in order to evaluate the evidence for response of epiphyte metrics to increased nutrients. ...
    Nitrogen input inventory in the Nooksack-Abbotsford-Sumas Transboundary Region: Key component of an international nitrogen management study (PRESENTATION)
    Nitrogen (N) is an essential biological element, so optimizing N use for food production while minimizing the release of N and co-pollutants to the environment is an important challenge. The Nooksack-Abbotsford-Sumas Transboundary (NAS) Region, spanning a portion of the western...
    Trends in nitrogen isotope ratios of juvenile winter flounder reflect changing nitrogen inputs to Rhode Island, USA estuarine systems (JOURNAL)
    Nitrogen isotope ratios (d 15N) in juvenile winter flounder, Pseudopleuronectes americanus, were used to examine changes in nitrogen inputs to several Rhode Island, USA estuarine systems. Fish were collected over two three-year periods with a ten-year interval between sampling pe...
    Using Stable Isotopes to Assess Connectivity: the Importance of Oceanic and Watershed Nitrogen Sources for Estuarine Primary Producers (PRESENTATION)
    Estuaries located at the interface of terrestrial and oceanic ecosystems receive nutrients from both ecosystems. Stable isotopes of primary producers and consumers are often used as an indicator of nutrient sources. We assembled natural abundance nitrogen stable isotope (δ15N) d...
    Modeling and Recent Shift in the Composition of Atmospheric Reactive Nitrogen (PRESENTATION)
    Nitrogen is an essential building block of all proteins and thus an essential nutrient for all life. Reactive nitrogen, which is naturally produced via enzymatic reactions, forest fires and lightning, is continually recycled and cascades through air, water, and soil media. Human ...
    Chronic nitrogen deposition influences the chemical dynamics of leaf litter and fine roots during decomposition (JOURNAL)
    Atmospheric nitrogen deposition induces a forest carbon sink across broad parts of the Northern Hemisphere; this carbon sink may partly result from slower litter decomposition. Although microbial responses to experimental nitrogen deposition have been well-studied, evidence linki...
    The nitrogen footprint tool network: a multi-institution program to reduce nitrogen pollution (JOURNAL)
    Anthropogenic sources of reactive nitrogen have local and global impacts on air and water quality and detrimental effects on human and ecosystem health. This paper uses the nitrogen footprint tool (NFT) to determine the amount of nitrogen (N) released as a result of institutional...
    Comparing Institution Nitrogen Footprints: Metrics for Assessing and Tracking Environmental Impact (JOURNAL)
    When multiple institutions with strong sustainability initiatives use a new environmental impact assessment tool, there is an impulse to compare. The first seven institutions to calculate their nitrogen footprints using the nitrogen footprint tool have worked collaboratively to i...
    Growth, morphometrics and nutrient content of farmed eastern oysters, Crassostrea virginica (Gmelin), in New Hampshire, USA (JOURNAL)
    When harvested, oysters represent a removal from the ecosystem of nutrients such as nitrogen (N)and carbon (C). A number of factors potentially affect nutrient content, but a quantitative understanding across the geographical range of the eastern oysters is lacking. This study wa...
    A Case Study on Nitrogen Uptake and Denitrification in a Restored Urban Stream in Baltimore, Maryland (PRESENTATION)
    Restoring urban infrastructure and managing the nitrogen cycle represent emerging challenges for urban water quality. We investigated whether stormwater control measures (SCMs), a form of green infrastructure, integrated into restored and degraded urban stream networks can influe...
    Research to Inform Nutrient Thresholds and Prioritization of Watersheds for Nutrient Management (PRESENTATION)
    The information in this presentation focuses on SSWR's 4.02 project, which will advance the science needed to inform decisions to prioritize watersheds and nutrient sources for nutrient management and define appropriate nutrient levels for the nation&rsquo;s waters, two importan...
    Watershed modeling and monitoring for assessing nutrient trading viability and increasing the adoption of nutrient management practices (PRESENTATION)
    Presentation for the American Water Works Association Water Sustainability Conference. The presentation highlights latest results from water quality trading research conducted by ORD using the East Fork Watershed in Southwestern Ohio as a case study. The watershed has a nutrient ...
    Long-Term Simulated Atmospheric Nitrogen Deposition Alters Leaf and Fine Root Decomposition (JOURNAL)
    Atmospheric nitrogen deposition has been suggested to increase forest carbon sequestration across much of the Northern Hemisphere; slower organic matter decomposition could contribute to this increase. At four sugar maple (Acer saccharum)-dominated northern hardwood forests, we p...
    Attributes of Successful Actions to Restore Lakes and Estuaries Degraded by Nutrient Pollution- (JOURNAL)
    As more success is achieved in restoring lakes and estuaries from the impacts of nutrient pollution, there is increased opportunity to evaluate the scientific, social, and policy factors associated with achieving restoration goals. We examined case studies where deliberate action...
    Canadian-US Demonstration Project Towards an International Nitrogen Assessment System (PRESENTATION)
    Bellingham Bay will provide the test case for an international nitrogen (N) management system for North America. Spanning a portion of the western interface of the U.S. and Canada, the region supports intensive agriculture, freshwater and estuarine fisheries, diverse wildlife, ci...
    Ecosystem services impacts associated with environmental reactive nitrogen release in the United States (PRESENTATION)
    Nitrogen release to the environment from human activities can have important and costly impacts on human health, recreation, transportation, fisheries, and ecosystem health. Recent efforts to quantify these damage costs have identified annual damages associated with reactive nit...
    Watershed delineation and nitrogen source analysis for Bayou Chico, an urban watershed in northwest Florida (PRESENTATION)
    Nutrient pollution in stormwater runoff from urbanized areas contributes to water quality degradation in streams and receiving waterbodies. Agriculture, population growth, and industrial activities are significant sources of nitrogen inputs for surface waters. Increased nitrogen ...
    Ambient Ammonium Contribution to total Nitrogen Deposition (PRESENTATION)
    There has been a wealth of evidence over the last decade illustrating the rising importance of reduced inorganic nitrogen (NHx = ammonia gas, NH3, plus particulate ammonium, p-NH4) in the overall atmospheric mass balance and deposition of nitrogen as emissions of oxidized nitrog...
    Attributes of Successful Actions to Restore Lakes and Estuaries Degraded by Nutrient Pollution (PRESENTATION)
    As more success is achieved restoring lakes and estuaries from nutrient pollution, there is increased opportunity to evaluate the scientific, social, and policy factors associated with achieving restoration goals. We examined case studies where deliberate actions to reduce nutri...