Record Display for the EPA National Library Catalog


Main Title 2007 Great Bay Organic Nitrogen (PON and DON) and Light Extinction (PAR) Monitoring Program. A Final Report to the New Hampshire Estuaries Project.
Author J. Pennock
CORP Author New Hampshire Univ., Durham. Jackson Estuarine Lab.; New Hampshire Estuaries Project., Concord, NH.; Environmental Protection Agency, Washington, DC.
Year Published 2008
Stock Number PB2011-106523
Additional Subjects Nitrogen ; Estuaries ; Eutrophication ; New Hampshire ; Turbidity ; Nutrients ; Water quality ; US EPA ; Chlorophyll ; Dissolved organic nitrogen ; Photosynthetically active radiation ; New Hampshire estuaries program ; Lamprey river ; Squamscott river ; Chapman's landing ; Oyster river ; Great bay ; Coastal marine lab
Library Call Number Additional Info Location Last
NTIS  PB2011-106523 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
Nitrogen is most often considered to be the limiting nutrient for plant growth in marine waters. As a result, knowledge of nitrogen loading and ambient water-column concentrations are considered to be critical to understanding the response of aquatic ecosystems to nutrient over-enrichmenta process known as eutrophication when it results in the excess production of organic matter. Plant production in many estuarine systems may also be limited by light availability as a result of high levels of turbidity in the water resulting from sediments, dissolved organic matter, and phytoplankton in the water column. Light limitation resulting from human-induced increases in turbidity is known to be particularly deliterious to seagrass production/distribution in some ecosystems and also play an important role in determining how phytoplankton respond to nutrient enrichment. EPA is developing water qulaity criteria for estuaries that require knowledge of both total nitrogen and light availability (measured as photsynthetically active radiation, PAR). Through the National Estuarine Research Reserve (NERR) System-Wide Monitoring Program (SWMP), inorganic nutrient concentrations, chlorophyll-a concetration, and a number of hydrographic and water quality parameters are sampled on a monthly basis at 7 sites in the Great Bay system. This project takes advantage of these existing monitoring activities to collect and analyze for particulate organic nitrogen (PON), dissolved organic nitrogen (DON) and photosynthetically active radiation (PAR) at existing sample sites in the New Hampshire seacoast region. When combined with existing dissolved inorganic nitrogen measurements, PON and DON allow the entire Total Nitrogen (TN) pool to be quantified. PAR measurements provide an estimate of the light availability in the system.