scholarly journals Water quality measurements in Buzzards Bay by the Buzzards Bay Coalition Baywatchers Program from 1992 to 2018

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Rachel W. Jakuba ◽  
Tony Williams ◽  
Christopher Neill ◽  
Joseph E. Costa ◽  
Richard McHorney ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Carbon ◽  
Public Awareness ◽  
Secchi Depth ◽  
Monitoring Program ◽  
Dissolved Nitrogen ◽  
Management Actions ◽  
Total Dissolved Nitrogen ◽  
Nitrogen Inputs ◽  
Maximum Daily Loads

AbstractThe Buzzards Bay Coalition’s Baywatchers Monitoring Program (Baywatchers) collected summertime water quality information at more than 150 stations around Buzzards Bay, Massachusetts from 1992 to 2018. Baywatchers documents nutrient-related water quality and the effects of nitrogen pollution. The large majority of stations are located in sub-estuaries of the main Bay, although stations in central Buzzards Bay and Vineyard Sound were added beginning in 2007. Measurements include temperature, salinity, Secchi depth and concentrations of dissolved oxygen, ammonium, nitrate + nitrite, total dissolved nitrogen, particulate organic nitrogen, particulate organic carbon, ortho-phosphate, chlorophyll a, pheophytin a, and in lower salinity waters, total phosphorus and dissolved organic carbon. The Baywatchers dataset provides a long-term record of the water quality of Buzzards Bay and its sub-estuaries. The data have been used to identify impaired waters, evaluate discharge permits, support the development of nitrogen total maximum daily loads, develop strategies for reducing nitrogen inputs, and increase public awareness and generate support for management actions to control nutrient pollution and improve water quality.

Dynamics of dissolved organic carbon and total dissolved nitrogen in Maryland's coastal bays

2015 ◽  
Vol 164 ◽  
pp. 451-462 ◽  
Author(s):  
Shuiwang Duan ◽  
Nianhong Chen ◽  
Sujay S. Kaushal ◽  
Paulinus Chigbu ◽  
Ali Ishaque ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Coastal Bays ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen

scholarly journals Simultaneous Determination of Dissolved Organic Carbon and Total Dissolved Nitrogen on a Coupled High-Temperature Combustion Total Organic Carbon-Nitrogen Chemiluminescence Detection (HTC TOC-NCD) System

2005 ◽  
Vol 2005 (4) ◽  
pp. 240-246 ◽  
Author(s):  
Xi Pan ◽  
Richard Sanders ◽  
Alan D. Tappin ◽  
Paul J. Worsfold ◽  
Eric P. Achterberg
Keyword(s):  
High Temperature ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Data Acquisition ◽  
Simultaneous Determination ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Temperature Combustion ◽  
High Temperature Combustion

The marine biogeochemistries of carbon and nitrogen have come under increased scrutiny because of their close involvement in climate change and coastal eutrophication. Recent studies have shown that the high-temperature combustion (HTC) technique is suitable for routine analyses of dissolved organic matter due to its good oxidation efficiency, high sensitivity, and precision. In our laboratory, a coupled HTC TOC-NCD system with a sample changer was used for the automated and simultaneous determination of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) in seawater samples. TOC control software was used for TOC instrument control, DOC data acquisition, and data analysis. TDN data acquisition and manipulation was undertaken under LabVIEW. The combined system allowed simultaneous determination of DOC and TDN in the same sample using a single injection and provided low detection limits and excellent linear ranges for both DOC and TDN. The risk of contamination has been remarkably reduced due to the minimal sample manipulation and automated analyses. The optimised system provided a reliable tool for the routine determination of DOC and TDN in marine waters.

scholarly journals Correction to: Influence of Biochar from Slow Pyrolysis on Dissolved Organic Carbon and Total Dissolved Nitrogen Levels of Urban Storm-Water Runoff

2018 ◽  
Vol 229 (8) ◽  
Author(s):  
Enrico Mancinelli ◽  
Edita Baltrėnaitė ◽  
Pranas Baltrėnas ◽  
Raimondas Grubliauskas ◽  
Eglė Marčiulaitienė ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Storm Water ◽  
Water Runoff ◽  
Slow Pyrolysis ◽  
Nitrogen Levels ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Storm Water Runoff ◽  
Urban Storm

scholarly journals The importance of riparian zones on stream carbon and nitrogen export in a temperate, agricultural dominated landscape

2012 ◽  
Vol 9 (6) ◽  
pp. 7465-7497 ◽  
Author(s):  
T. Wohlfart ◽  
J.-F. Exbrayat ◽  
K. Schelde ◽  
B. Christen ◽  
T. Dalgaard ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Agricultural Land ◽  
Stream Water ◽  
Soil Types ◽  
Organic Soils ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen

Abstract. The surrounding landscape of a stream has crucial impacts on the aquatic environment. This study pictures the hydro-biogeochemical situation of the Tyrebaekken creek catchment in central Jutland, Denmark. The intensively managed agricultural landscape is dominated by rotational croplands. One northern and one southern stream run through the catchment before converging to form a second order brook. The small catchments mainly consist of sandy soil types besides organic soils along the riparian zone of the streams. The aim of the study was to characterise the relative influence of soil type and land use on stream water quality. Nine snapshot sampling campaigns were undertaken during the growing season of 2009. On each sampling day, 20 points along the stream were sampled as well as eight drain outlets and two groundwater wells. Total dissolved nitrogen, nitrate, ammonium nitrogen and dissolved organic carbon (DOC) concentrations were measured and dissolved organic nitrogen (DON) was calculated for each grabbed sample. Electro-conductivity, pH and flow velocity were measured during sampling. Statistical analyses showed significant differences between the northern, southern and converged stream parts, especially for nitrate concentrations with average values of 9.6 mg N l−1, 1.4 mg N l−1 and 3.0 mg N l−1, respectively. Furthermore, throughout the sampling period DON concentrations increased from 0.1 mg N l−1 to 2.8 mg N l−1 and from 0.1 mg N l−1 to 0.8 mg N l−1in the northern and southern streams, respectively. This corresponded to a contribution of up to 81% to total dissolved nitrogen. Multiple-linear regression analyses performed between chemical data and landscape charateristics showed a significant negative influence of organic soils on instream N concentrations and corresponding losses in spite of their overall minor share of the agricultural land (12.9%). On the other hand, organic soil frequency was positively correlated to the corresponding dissolved organic carbon concentrations. Croplands also had a significant influence but with weaker correlations. For our case study we conclude that soil types and corresponding biogeochemical properties have a major influence on stream water chemistry. Meanwhile, the contribution of dissolved organic nitrogen to the total nitrogen budget was substantial in this agricultural dominated landscape.

scholarly journals Alternation of heterotrophic bacterial and archaeal production along nitrogen and salinity gradients in coastal wetlands

2020 ◽  
Author(s):  
Gema L. Batanero ◽  
Andy J. Green ◽  
Juan A. Amat ◽  
Marion Vittecoq ◽  
Curtis A. Suttle ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Bacterial Production ◽  
Coastal Wetlands ◽  
Negative Relationship ◽  
Western Mediterranean ◽  
Mediterranean Coast ◽  
Dissolved Nitrogen ◽  
Prokaryotic Abundance ◽  
Nitrogen Inputs ◽  
Virus Abundance

Abstract. Coastal wetlands are valuable ecosystems with high biological productivity and diversity, which provide ecosystem services such as a reduction in the inputs of nitrogen into coastal waters, and storage of organic carbon, thus, acting as net carbon sinks. The rise of sea level as a consequence of climatic warming will salinize many coastal wetlands, but there is considerable uncertainty about how salinization will affect microbial communities and biogeochemical processes. We analyzed prokaryotic abundance and heterotrophic bacterial and archaeal production in 112 ponds within nine coastal wetlands from the western Mediterranean coast. We determined the main drivers of prokaryotic abundance and production in these wetlands using generalized linear models (GLMs). The best GLM, including all the coastal wetlands, indicated that the concentration of total dissolved nitrogen (TDN) positively affected the abundance of heterotrophic prokaryotes and heterotrophic archaeal production. In contrast, heterotrophic bacterial production was negatively related to TDN. This negative relationship appeared to be mediated by salinity and virus abundance. Heterotrophic bacterial production declined as salinity, and virus abundance, increased. We observed a switch from heterotrophic bacterial production towards heterotrophic archaeal production as salinity and virus abundance increased. Our results imply that microbial activity will change from bacterial-dominated processes to archaeal-dominated processes along with increases of nitrogen inputs and salinity. However, more studies are required to link the mineralization rates of dissolved nitrogen and organic carbon with specific archaeal taxa, to enable more accurate predictions on future scenarios of wetlands salinization and anthropogenic nitrogen inputs.

scholarly journals Small-scale distribution of microbes and biogeochemistry in the Great Barrier Reef

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10049
Author(s):  
Cátia Carreira ◽  
Júlia Porto Silva Carvalho ◽  
Samantha Talbot ◽  
Isabel Pereira ◽  
Christian Lønborg
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Great Barrier Reef ◽  
Temporal Distribution ◽  
Small Scale ◽  
Barrier Reef ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Dissolved Inorganic Nutrients ◽  
Small Scales

Microbial communities distribute heterogeneously at small-scales (mm-cm) due to physical, chemical and biological processes. To understand microbial processes and functions it is necessary to appreciate microbes and matter at small scales, however, few studies have determined microbial, viral, and biogeochemical distribution over space and time at these scales. In this study, the small-scale spatial and temporal distribution of microbes (bacteria and chlorophyll a), viruses, dissolved inorganic nutrients and dissolved organic carbon were determined at five locations (spatial) along the Great Barrier Reef (Australia), and over 4 consecutive days (temporal) at a coastal location. Our results show that: (1) the parameters show high small-scale heterogeneity; (2) none of the parameters measured explained the bacterial abundance distributions at these scales spatially or temporally; (3) chemical (ammonium, nitrate/nitrite, phosphate, dissolved organic carbon, and total dissolved nitrogen) and biological (chl a, and bacterial and viral abundances) measurements did not reveal significant relationships at the small scale; and (4) statistically significant differences were found between sites/days for all parameter measured but without a clear pattern.

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