In situ response of bay productivity to nutrient loading from a small tributary: The Delaware Bay-Murderkill Estuary tidally-coupled biogeochemical reactor

Voynova, Yoana G.; Lebaron, Karine; Barnes, Rebecca T.; Ullman, William J.

doi:10.1016/j.ecss.2015.03.027

Cited by 18 publications

(16 citation statements)

References 51 publications

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“…Frequency analysis (Voynova et al, 2015) helped to identify a number of modes associated with tidal, daily and lowerfrequency harmonics at this station. The frequency spectra for the FerryBox data were compared to sea level frequency spectra from the GLOSS/CLIVAR database, so that biological signals could be identified.…”

Section: Cuxhaven Ferrybox Stationmentioning

confidence: 99%

“…The frequency spectra for the FerryBox data were compared to sea level frequency spectra from the GLOSS/CLIVAR database, so that biological signals could be identified. In addition to the frequency analysis, isolating the signals associated only with high tide or low tide according to method described in Voynova et al (2015) allowed us to better understand the biogeochemical changes at different locations in the Elbe estuary and to better visualize the changes in DO related to each water mass end member.…”

Section: Cuxhaven Ferrybox Stationmentioning

confidence: 99%

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Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

et al. 2017

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Abstract. Within the context of the predicted and observed increase in droughts and floods with climate change, large summer floods are likely to become more frequent. These extreme events can alter typical biogeochemical patterns in coastal systems. The extreme Elbe River flood in June 2013 not only caused major damages in several European countries but also generated large-scale biogeochemical changes in the Elbe estuary and the adjacent German Bight. The high-frequency monitoring network within the Coastal Observing System for Northern and Arctic Seas (COSYNA) captured the flood influence on the German Bight. Data from a FerryBox station in the Elbe estuary (Cuxhaven) and from a FerryBox platform aboard the M/V Funny Girl ferry (traveling between Büsum and Helgoland) documented the salinity changes in the German Bight, which persisted for about 2 months after the peak discharge. The Elbe flood generated a large influx of nutrients and dissolved and particulate organic carbon on the coast. These conditions subsequently led to the onset of a phytoplankton bloom, observed by dissolved oxygen supersaturation, and higher than usual pH in surface coastal waters. The prolonged stratification also led to widespread bottom water dissolved oxygen depletion, unusual for the southeastern German Bight in the summer.

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Section: Cuxhaven Ferrybox Stationmentioning

confidence: 99%

Section: Cuxhaven Ferrybox Stationmentioning

confidence: 99%

Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

et al. 2017

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“…Sandy sediments, salt marshes, and intertidal flats are so‐called biogeochemical reactors, where organic matter from the adjacent coastal areas and the overlying water column is deposited and subsequently remineralized. The remineralized nutrients are released from pore waters back to the overlying water column and the adjacent coastal areas, providing a tight coupling between the benthic and pelagic communities via tidal circulation (Postma ; Anschutz et al ; Beck and Brumsack ; Voynova et al ). This coupling could provide remineralized nutrients and TA to surface waters, therefore continually sustaining primary production when other nutrient sources become scarce (Santos et al ).…”

mentioning

confidence: 99%

Intertidal regions changing coastal alkalinity: The Wadden Sea‐North Sea tidally coupled bioreactor

Voynova

Petersen

Gehrung

et al. 2018

Limnology & Oceanography

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In this study, we successfully implemented a total alkalinity (TA) analyzer in a flow-through setup, in combination with a FerryBox. The high-frequency (10 min) measurements along our ship's route revealed that in coastal systems, where carbon fluxes are dynamic, TA can differ significantly (by up to 100 μmol kg −1 ) between the nearshore and adjacent coastal regions. Even though this study could not account for the net yearly TA production in the coastal region, it demonstrated that there was a seasonal increase in TA of 100-150 μmol kg −1 in coastal waters of the North Sea, equivalent to TA production of 11.7-26.8 mmol m −2 d −1 during the spring and summer months. This seasonal change could not be accounted for by riverine contributions, but instead was probably related to seasonal organic matter production and processing in coastal and nearshore regions. Bottom sediments and the tidally coupled biogeochemical reactor between coastal (North Sea) and nearshore (Wadden Sea) regions are mediating this TA change, and the~4 months lag between the seasonal increase in alkalinity and the peak organic matter production could be explained by the supply of (labile) organic matter and its temperature-dependent remineralization via both aerobic and anaerobic pathways.

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“…e,f), confirming that the mesohaline estuary is net heterotrophic during the summer months, consistent with previous studies (Sharp ; Thuman ). Toward the mouth of the estuary in July, however, both parameters increased, probably due to mixing with the autotrophic Delaware Bay waters, characterized by high DO (> 100% saturation) and chlorophyll (> 20 μg L −1 ) levels (Voynova et al ). In November, dissolved oxygen remained at 80–100% saturation across the entire estuary and showed no evidence of the mid‐estuary sag that was present in July (Fig.…”

Section: Resultsmentioning

confidence: 99%

Distance‐based mixing models of δ¹⁸ and δ¹⁸ in a marsh‐lined estuary with multiple, distinct sources (Murderkill Estuary, Delaware, USA)

Fischer

York

Voynova

et al. 2016

Limnology & Oceanography

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The Murderkill Estuary (Delaware, USA) receives NO3− principally from its upland watershed and from a wastewater treatment facility. Due to disparate NO3− sources, one‐dimensional salinity‐based mixing models were inadequate for describing distributions of NO3−, δ15 NNO3−, and δ18 ONO3−. Distance‐based mixing models with multiple, spatially‐specified inputs were, therefore, applied to describe conservative mixing of these constituents and determine the extent to which biogeochemical reactions lead to non‐conservative behavior of NO3−. These models closely matched Si observations in both winter and summer, consistent with high wastewater silicate loads and light limitation, and serve to validate modeling parameters for both seasons. A close fit of distance‐based models to estuarine NO3− observations suggested a lack of uptake and fractionation in early winter. In the summer, modeled predictions of NO3−, δ15 NNO3−, and δ18 ONO3− diverged from estuarine observations, particularly in the oligohaline and polyhaline regions, consistent with in situ nitrogen cycling or additional sources and sinks. Effluent from an adjacent marsh in the lower estuary contained NO3− with low δ15 NNO3− and δ18ONO3, low DO and high NH4+ concentrations in late summer. This data and previous studies of adjacent Delaware Bay suggest that reactions in marshes and Bay waters likely drove the non‐conservative behavior of NO3− and its stable isotopes. Potential uncertainty in watershed discharge, however, limited explicit quantitation of NO3− loss in the estuary. Nonetheless, distance‐based models are useful tools for the study of NO3−, δ15 NNO3− and δ18 ONO3− distributions and cycling patterns in complex marsh‐lined estuaries with multiple NO3− inputs.

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In situ response of bay productivity to nutrient loading from a small tributary: The Delaware Bay-Murderkill Estuary tidally-coupled biogeochemical reactor

Cited by 18 publications

References 51 publications

Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

Intertidal regions changing coastal alkalinity: The Wadden Sea‐North Sea tidally coupled bioreactor

Distance‐based mixing models of δ¹⁸ and δ¹⁸ in a marsh‐lined estuary with multiple, distinct sources (Murderkill Estuary, Delaware, USA)

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In situ response of bay productivity to nutrient loading from a small tributary: The Delaware Bay-Murderkill Estuary tidally-coupled biogeochemical reactor

Cited by 18 publications

References 51 publications

Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

Extreme flood impact on estuarine and coastal biogeochemistry: the 2013 Elbe flood

Intertidal regions changing coastal alkalinity: The Wadden Sea‐North Sea tidally coupled bioreactor

Distance‐based mixing models of δ18 and δ18 in a marsh‐lined estuary with multiple, distinct sources (Murderkill Estuary, Delaware, USA)

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Distance‐based mixing models of δ¹⁸ and δ¹⁸ in a marsh‐lined estuary with multiple, distinct sources (Murderkill Estuary, Delaware, USA)