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The Influence of River Variability on the Circulation, Chemistry, and Microbiology of the
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In this paper, a simple advection-diffusion model was proposed to show that the apparent non-conservative behavior of nitrate in the Delaware Estuary can result from varying endmember concentration and varying river discharge.Abstract:
Gravitational circulation of the Delaware Estuary is dominated by a single river, the Delaware River. The seasonal variation in river discharge is large. Consequently, the water column varies between vertically homogenous conditions found during most of the year and strongly stratified conditions found during the high flow of the spring freshet. Both the variation in river discharge and the extent of stratification affect chemical distributions and biological processes in the estuary. With a simple advection-diffusion model, we show that the apparent nonconservative behavior of nitrate in the Delaware Estuary can result from varying endmember concentration and varying river discharge. In addition, we illustrate the relationship between water column stratifi- cation, phytoplankton production, and concurrent bacterial activity. Finally, as an indirect chemical response to phytoplankton growth during high river discharge, we show strongly nonconservative patterns for ammonium, phosphate, and silicate in the estuary.read more
Citations
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Journal ArticleDOI
Stable carbon and nitrogen isotope biogeochemistry in the Delaware estuary
TL;DR: In this paper, seasonal variability in stable carbon (S’XZ) and nitrogen (b15N) isotope ratios was observed in suspended particulate matter of the Delaware estuary.
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Sources and distribution of organic matter in a river-dominated estuary (Winyah Bay, SC, USA)
TL;DR: The sources and distribution of organic matter (OM) in surface waters and sediments from Winyah Bay (South Carolina, USA) were investigated using a variety of analytical techniques, including elemental, stable isotope and organic biomarker analyses as mentioned in this paper.
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On the nature of transverse variability in a coastal plain estuary
TL;DR: In this article, the authors examined the mechanisms which might explain the observed transverse structure in drowned river valley estuaries with triangular cross sections and found that both the gravitational effect and wind forcing are capable of generating substantial transverse structures.
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Seasonal and inter-annual variability in bacterial production and biomass in a temperate estuary
MP Hoch,DL Kirchman +1 more
TL;DR: In this paper, the authors studied the dynamics of heterotrophic bactena and phytoplankton in the Delaware Estuary and found that bactenal abundance and chlorophyll concentration were only weakly correlated.
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Bacterial uptake of dissolved free and combined amino acids in estuarine waters
TL;DR: The Delaware estuary was sampled at lo-14 stations along the main salinity axis from February to August 1985 as discussed by the authors, where dissolved free and combined amino acid concentrations were generally higher than dissolved free amino acids.
References
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Book
The mathematics of diffusion
TL;DR: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
UseofNuclepore Filters forCounting Bacteria by Fluorescence Microscopy
TL;DR: Polycarbonate Nuclepore filters are better than cellulose filters for the direct counting of bacteria because they have uniform pore size and a flat surface that retains all of the bacteria on top of the filter.
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Use of nuclepore filters for counting bacteria by fluorescence microscopy.
TL;DR: Polycarbonate Nuclepore filters are better than cellulose filters for the direct counting of bacteria because they have uniform pore size and a flat surface that retains all of the bacteria on top of the filter.
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The chemistry of the Delaware estuary. General considerations1
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The effect of the spring-neap tidal cycle on the vertical salinity structure of the James, York and Rappahannock Rivers, Virginia, U.S.A.☆
TL;DR: In this paper, salinity data from the lower York and Rappahannock Rivers (Virginia, U.S.A.) for 1974 revealed that both of these estuaries oscillated between conditions of considerable vertical salinity stratification and homogeneity on a cycle that was closely correlated with the spring-neap tidal cycle.