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• W3208351333 abstract "Timeseries for the load of total nitrogen (TN) to Narragansett Bay, from 18wastewater treatment facility (WWTF) and land-based runoff sources bay-wide,have been estimated at daily resolution for 2001-2017. The motivation for dailyresolution is to enable including nitrogen load as a candidate influence (withothers such as river flow, temperature, tidal conditions, etc; e.g., Codiga etal 2009) in statistical analyses investigating drivers of hypoxic events at theshort timescales of days to weeks on which events are known to vary. Timeseries were estimated back to 2001 because such analyses rely on NarragansettBay Fixed Site Monitoring Network time series oxygen observations, which beganthat year. The WWTF and riverine sources treated are generally the same asthose in the annual-budget analyses in the State of Narragansett Bay and ItsWatershed (NBEP 2017). The 18 sources include 11 WWTFs (nine in Rhode Islandand two in Massachusetts) discharging directly to the bay; 6 rivers where theyenter the bay, which include load from WWTFs located upstream on them; andrunoff direct to the bay from ungauged riparian areas. The observations wereobtained from the Rhode Island Department of Environmental Management, theNarragansett Bay Commission, the Fall River treatment facility, and the USGeological Survey. Load was computed as the product of concentration and flow.For concentration, linear interpolation was necessary as the nominal frequencyof observations ranged from weekly or biweekly, for most of the largest sources,to monthly. However, temporal variations in load are dominated by flowvariability, which spans multiple orders of magnitude while concentrationvariations are less pronounced, and daily flow measurements were available formany of the largest sources. During periods when TN was not directly measured,it was computed as the sum of other measured concentrations (e.g., totalKjeldahl nitrogen plus nitrate plus nitrite), or using a correlation between TNand other constituents during periods when both were measured, or as thelongterm mean seasonal cycle of TN computed from sampled years. As a check onthe reasonableness of the results, the annual-mean loads from the new timeseries, computed by averaging the daily values, were compared to results ofearlier budgets reported in NBEP (2017) for three periods: 2000-2004 (Nixon etal 2008), 2007-2010 (Krumholz 2012), and 2013-2015 (NBEP 2017). The differencesare notable, as expected given the divergent methods, but the agreement isacceptable for the intended use of the new daily time series; for ascertaininglongterm changes in loading, the NBEP results are more appropriate. It isrecognized that the estimated daily TN loads are approximate, particularly forthe several earliest years when fewer concentration measurements were made. Anumber of suggestions for how to improve the methods are given. The new timeseries were used to investigate hypoxia in a companion report (Codiga 2020) andare expected to be of use for various other studies. NOTE: The data for the companion report are available fordownload in spreadsheet (.xlsx) and Matlab (.mat) file formats, with documentedsupporting code, at https://figshare.com/s/7d51f2540df6638a4552.The views expressed in this report are those of the authors and do not necessarily represent the views or policies of the U.S. Environmental Protection Agency or the New England Interstate Water Pollution Control Commission. Any mention of trade names, products, or services does not imply an endorsement by the U.S. Government, the U.S. Environmental Protection Agency, or the New England Interstate Water Pollution Control Commission. The EPA and NEIWPCC do not endorse any commercial products, services, or enterprises." @default.
• W3208351333 created "2021-11-08" @default.
• W3208351333 creator A5003633831 @default.
• W3208351333 date "2020-07-07" @default.
• W3208351333 modified "2023-09-23" @default.
• W3208351333 title "Daily-Resolution 2001-2017 Time Series of Total Nitrogen Load to Narragansett Bay from Bay-Wide Treatment Facility and Watershed Sources" @default.
• W3208351333 doi "https://doi.org/10.6084/m9.figshare.12573851.v1" @default.
• W3208351333 hasPublicationYear "2020" @default.
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