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<!DOCTYPE html> <html lang="en"> <head><script type='text/javascript' src='//cdnjs.cloudflare.com/ajax/libs/yui/3.6.0/yui/yui-min.js'></script><script type='text/javascript' src='//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js'></script><script type='text/javascript' src='https://assets.adobedtm.com/4a848ae9611a/d0e96722185b/launch-d525bb0064d8.min.js'></script><script type='text/javascript' src=/assets/nr_browser_production.js></script>  <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title> "Sources and Fluxes of Reactive N in a Southern New England River" by Veronica Rollinson </title>  <meta itemprop="name" content="Sources and Fluxes of Reactive N in a Southern New England River"> <meta property="og:title" content="Sources and Fluxes of Reactive N in a Southern New England River"> <meta name="twitter:title" content="Sources and Fluxes of Reactive N in a Southern New England River"> <meta property="article:author" content="Veronica Rollinson"> <meta name="author" content="Veronica Rollinson"> <meta name="robots" content="noodp, noydir"> <meta name="description" content="Little Narraganset Bay has seen an increase in filamentous algae, colloquially known as cladophora, over the past twenty years. The Pawcatuck River is the dominant input of freshwater to Little Narraganset bay, delineating the Connecticut and Rhode Island border. There are three point sources of nitrogen on the river system: two waste water treatment facilities (WWTF) in the estuary and one fabric processing plant within the upper-watershed in Kenyon, RI. Non-point sources include a myriad of farms specializing in turf and animal husbandry, as well as septic systems for the majority of the watershed that are not serviced by the WWTFs. Prior research has produced yearly flux estimates of nitrogen (N) yet point to different anthropogenic sources including sewage for estuarine WWTF and fertilizer from upriver as predominant nutrient sources of N algal growth. Samplings, conducted weekly for an annual cycle, at the Westerly and Stillman Bridges at the mouth of the Pawcatuck River – upstream of seawater intrusion, and seasonal down-river transects from Wakefield, RI to Westerly, RI were collected in order to track seasonal changes and determine sources of N along the river. Nutrients of N (nitrate, nitrite, and ammonium), phosphate, and nitrate isotopes were measured at each sampling point. Nitrate isotopes provided additional power for analysis to help differentiate various input sources into the river as well as to determine cycling of N on the river. Results indicate that there were significant seasonal variations in nutrient input of nitrate and ammonia linked to seasonal discharge rates where high discharge occurs in the winter and low flow occurs in the summer. With seasonal discharge rates, the WWTFs contribute negligible amounts of N to the river in winter and up to 15% of the loading in the summer. Results also signify that the overall annual flux of the Pawcatuck river into Little Narraganset Bay are consistent with prior estimates, where DIN, DON, and TN export is equal to 18 x 106, 15 x 106, and 32 x 106 moles of N per year respectively indicating there have been no major changes N flux in the upper river."> <meta itemprop="description" content="Little Narraganset Bay has seen an increase in filamentous algae, colloquially known as cladophora, over the past twenty years. The Pawcatuck River is the dominant input of freshwater to Little Narraganset bay, delineating the Connecticut and Rhode Island border. There are three point sources of nitrogen on the river system: two waste water treatment facilities (WWTF) in the estuary and one fabric processing plant within the upper-watershed in Kenyon, RI. Non-point sources include a myriad of farms specializing in turf and animal husbandry, as well as septic systems for the majority of the watershed that are not serviced by the WWTFs. Prior research has produced yearly flux estimates of nitrogen (N) yet point to different anthropogenic sources including sewage for estuarine WWTF and fertilizer from upriver as predominant nutrient sources of N algal growth. Samplings, conducted weekly for an annual cycle, at the Westerly and Stillman Bridges at the mouth of the Pawcatuck River – upstream of seawater intrusion, and seasonal down-river transects from Wakefield, RI to Westerly, RI were collected in order to track seasonal changes and determine sources of N along the river. Nutrients of N (nitrate, nitrite, and ammonium), phosphate, and nitrate isotopes were measured at each sampling point. Nitrate isotopes provided additional power for analysis to help differentiate various input sources into the river as well as to determine cycling of N on the river. Results indicate that there were significant seasonal variations in nutrient input of nitrate and ammonia linked to seasonal discharge rates where high discharge occurs in the winter and low flow occurs in the summer. With seasonal discharge rates, the WWTFs contribute negligible amounts of N to the river in winter and up to 15% of the loading in the summer. Results also signify that the overall annual flux of the Pawcatuck river into Little Narraganset Bay are consistent with prior estimates, where DIN, DON, and TN export is equal to 18 x 106, 15 x 106, and 32 x 106 moles of N per year respectively indicating there have been no major changes N flux in the upper river."> <meta name="twitter:description" content="Little Narraganset Bay has seen an increase in filamentous algae, colloquially known as cladophora, over the past twenty years. The Pawcatuck River is the dominant input of freshwater to Little Narraganset bay, delineating the Connecticut and Rhode Island border. There are three point sources of nitrogen on the river system: two waste water treatment facilities (WWTF) in the estuary and one fabric processing plant within the upper-watershed in Kenyon, RI. Non-point sources include a myriad of farms specializing in turf and animal husbandry, as well as septic systems for the majority of the watershed that are not serviced by the WWTFs. Prior research has produced yearly flux estimates of nitrogen (N) yet point to different anthropogenic sources including sewage for estuarine WWTF and fertilizer from upriver as predominant nutrient sources of N algal growth. Samplings, conducted weekly for an annual cycle, at the Westerly and Stillman Bridges at the mouth of the Pawcatuck River – upstream of seawater intrusion, and seasonal down-river transects from Wakefield, RI to Westerly, RI were collected in order to track seasonal changes and determine sources of N along the river. Nutrients of N (nitrate, nitrite, and ammonium), phosphate, and nitrate isotopes were measured at each sampling point. Nitrate isotopes provided additional power for analysis to help differentiate various input sources into the river as well as to determine cycling of N on the river. Results indicate that there were significant seasonal variations in nutrient input of nitrate and ammonia linked to seasonal discharge rates where high discharge occurs in the winter and low flow occurs in the summer. With seasonal discharge rates, the WWTFs contribute negligible amounts of N to the river in winter and up to 15% of the loading in the summer. Results also signify that the overall annual flux of the Pawcatuck river into Little Narraganset Bay are consistent with prior estimates, where DIN, DON, and TN export is equal to 18 x 106, 15 x 106, and 32 x 106 moles of N per year respectively indicating there have been no major changes N flux in the upper river."> <meta property="og:description" content="Little Narraganset Bay has seen an increase in filamentous algae, colloquially known as cladophora, over the past twenty years. The Pawcatuck River is the dominant input of freshwater to Little Narraganset bay, delineating the Connecticut and Rhode Island border. There are three point sources of nitrogen on the river system: two waste water treatment facilities (WWTF) in the estuary and one fabric processing plant within the upper-watershed in Kenyon, RI. Non-point sources include a myriad of farms specializing in turf and animal husbandry, as well as septic systems for the majority of the watershed that are not serviced by the WWTFs. Prior research has produced yearly flux estimates of nitrogen (N) yet point to different anthropogenic sources including sewage for estuarine WWTF and fertilizer from upriver as predominant nutrient sources of N algal growth. Samplings, conducted weekly for an annual cycle, at the Westerly and Stillman Bridges at the mouth of the Pawcatuck River – upstream of seawater intrusion, and seasonal down-river transects from Wakefield, RI to Westerly, RI were collected in order to track seasonal changes and determine sources of N along the river. Nutrients of N (nitrate, nitrite, and ammonium), phosphate, and nitrate isotopes were measured at each sampling point. Nitrate isotopes provided additional power for analysis to help differentiate various input sources into the river as well as to determine cycling of N on the river. Results indicate that there were significant seasonal variations in nutrient input of nitrate and ammonia linked to seasonal discharge rates where high discharge occurs in the winter and low flow occurs in the summer. With seasonal discharge rates, the WWTFs contribute negligible amounts of N to the river in winter and up to 15% of the loading in the summer. Results also signify that the overall annual flux of the Pawcatuck river into Little Narraganset Bay are consistent with prior estimates, where DIN, DON, and TN export is equal to 18 x 106, 15 x 106, and 32 x 106 moles of N per year respectively indicating there have been no major changes N flux in the upper river."> <meta name="keywords" content="Nutrients, river, isotopes, nitrogen, d15N"> <meta name="bepress_citation_series_title" content="Master's Theses"> <meta name="bepress_citation_author" content="Rollinson, Veronica"> <meta name="bepress_citation_title" content="Sources and Fluxes of Reactive N in a Southern New England River"> <meta name="bepress_citation_date" content="2020">   <meta name="bepress_citation_pdf_url" content="https://digitalcommons.lib.uconn.edu/cgi/viewcontent.cgi?article=2631&context=gs_theses"> <meta name="bepress_citation_abstract_html_url" content="https://digitalcommons.lib.uconn.edu/gs_theses/1510"> <meta name="bepress_citation_online_date" 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id="series-title"><a href="https://digitalcommons.lib.uconn.edu/gs_theses" >Master's Theses</a></h2></div> <div style="clear: both"> </div> <div id="sub"> <div id="alpha"> <div id='title' class='element'> <h1><a href='https://digitalcommons.lib.uconn.edu/cgi/viewcontent.cgi?article=2631&context=gs_theses'>Sources and Fluxes of Reactive N in a Southern New England River</a></h1> </div> <div class='clear'></div> <div id='authors' class='element'> <h2 class='visually-hidden'>Authors</h2> <p class="author"><a href='https://digitalcommons.lib.uconn.edu/do/search/?q=bp_author_id%3A%225bd9e1a1-2b8c-4dcc-980d-f01436b20c75%22%20OR%20%28author%3A%22Veronica%20Rollinson%22%20AND%20-bp_author_id%3A%5B%2A%20TO%20%2A%5D%29&start=0&context=48134'><strong>Veronica Rollinson</strong></a><a rel="nofollow" href="https://network.bepress.com/api/follow/subscribe?user=OWNkYTA2OGM1MmY3NDA5Mw%3D%3D&institution=ZjFhZDRkY2M4N2IyODY2Yw%3D%3D&format=html" data-follow-set="user:OWNkYTA2OGM1MmY3NDA5Mw== institution:ZjFhZDRkY2M4N2IyODY2Yw==" title="Follow Veronica Rollinson" class="btn followable">Follow</a><br /> </p></div> <div class='clear'></div> <div id='publication_date' class='element'> <h2 class='field-heading'>Date of Completion</h2> <p>5-10-2020</p> </div> <div class='clear'></div> <div id='embargo_date' class='element'> <h2 class='field-heading'>Embargo Period</h2> <p>5-6-2020</p> </div> <div class='clear'></div> <div id='advisor' class='element'> <h2 class='field-heading'>Advisors</h2> <p>Julie Granger, Craig Tobias, Claudia Koerting, Jamie Vaudrey</p> </div> <div class='clear'></div> <div id='department' class='element'> <h2 class='field-heading'>Field of Study</h2> <p>Oceanography</p> </div> <div class='clear'></div> <div id='degree' class='element'> <h2 class='field-heading'>Degree</h2> <p>Master of Science</p> </div> <div class='clear'></div> <div id='document_type' class='element'> <h2 class='field-heading'>Open Access</h2> <p>Open Access</p> </div> <div class='clear'></div> <div id='abstract' class='element'> <h2 class='field-heading'>Abstract</h2> <p>Little Narraganset Bay has seen an increase in filamentous algae, colloquially known as cladophora, over the past twenty years. The Pawcatuck River is the dominant input of freshwater to Little Narraganset bay, delineating the Connecticut and Rhode Island border. There are three point sources of nitrogen on the river system: two waste water treatment facilities (WWTF) in the estuary and one fabric processing plant within the upper-watershed in Kenyon, RI. Non-point sources include a myriad of farms specializing in turf and animal husbandry, as well as septic systems for the majority of the watershed that are not serviced by the WWTFs. Prior research has produced yearly flux estimates of nitrogen (N) yet point to different anthropogenic sources including sewage for estuarine WWTF and fertilizer from upriver as predominant nutrient sources of N algal growth. Samplings, conducted weekly for an annual cycle, at the Westerly and Stillman Bridges at the mouth of the Pawcatuck River – upstream of seawater intrusion, and seasonal down-river transects from Wakefield, RI to Westerly, RI were collected in order to track seasonal changes and determine sources of N along the river. Nutrients of N (nitrate, nitrite, and ammonium), phosphate, and nitrate isotopes were measured at each sampling point. Nitrate isotopes provided additional power for analysis to help differentiate various input sources into the river as well as to determine cycling of N on the river. Results indicate that there were significant seasonal variations in nutrient input of nitrate and ammonia linked to seasonal discharge rates where high discharge occurs in the winter and low flow occurs in the summer. With seasonal discharge rates, the WWTFs contribute negligible amounts of N to the river in winter and up to 15% of the loading in the summer. Results also signify that the overall annual flux of the Pawcatuck river into Little Narraganset Bay are consistent with prior estimates, where DIN, DON, and TN export is equal to 18 x 10<sup>6</sup>, 15 x 10<sup>6</sup>, and 32 x 10<sup>6</sup> moles of N per year respectively indicating there have been no major changes N flux in the upper river.</p> </div> <div class='clear'></div> <div id='recommended_citation' class='element'> <h2 class='field-heading'>Recommended Citation</h2> <p> Rollinson, Veronica, "Sources and Fluxes of Reactive N in a Southern New England River" (2020). <em>Master's Theses</em>. 1510. <br> https://digitalcommons.lib.uconn.edu/gs_theses/1510 </p> </div> <div class='clear'></div> <div id='m_advisor' class='element'> <h2 class='field-heading'>Major Advisor</h2> <p>Dr. Julie Granger</p> </div> <div class='clear'></div> </div> </div> <div id='beta_7-3'>     <div class="aside download-button"> <a id="pdf" class="btn" 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