Radium-based pore water fluxes of silica, alkalinity, manganese, DOC, and uranium: A decade of studies in the German Wadden Sea

Moore, Willard S.; Beck, Mélanie; Riedel, Thomas; Loeff, Michiel Rutgers v. d.; Dellwig, Olaf; Shaw, Timothy J.; Schnetger, Bernhard; Brumsack, Hans‐Jürgen

doi:10.1016/j.gca.2011.08.037

Cited by 106 publications

(79 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beck et al, 2008;Billerbeck et al, 2006;Grunwald et al, 2010;Marchant et al, 2014;Moore et al, 2011;Riedel et al, 2011;Røy et al, 2008;Santos et al, 2015). Pore water discharge rates calculated for nearby sandy Wadden Sea sediments vary depending on the method applied and the sediment depth considered Moore et al, 2011;Riedel et al, 2010), among which the method most comparable to the model approach applied in our study resulted in lower flux rates (0.97 m −3 per tide and meter of shoreline, which equals~2 m −3 per day and meter of shoreline; Riedel et al, 2010) compared to our study. Due to the high nutrient enrichment in the tidal flat pore waters compared to Spiekeroog beach sediments (Reckhardt et al, 2015), the nutrient efflux from these sediments can, however, be higher compared to the beach site.…”

Section: Pore Water Discharge Influences Phytobenthos and Nearshore Wcontrasting

confidence: 53%

“…The latter were shown to be of great importance for carbon, nutrient, and trace metal cycles in the large tidal flat area called Wadden Sea stretching from the Netherlands to Denmark, and the frequent water exchange between tidal flat areas and the North Sea transport carbon, nutrient, and trace metals to coastal waters of the North Sea (e.g. Beck et al, 2008;Billerbeck et al, 2006;Grunwald et al, 2010;Marchant et al, 2014;Moore et al, 2011;Riedel et al, 2011;Røy et al, 2008;Santos et al, 2015). Pore water discharge rates calculated for nearby sandy Wadden Sea sediments vary depending on the method applied and the sediment depth considered Moore et al, 2011;Riedel et al, 2010), among which the method most comparable to the model approach applied in our study resulted in lower flux rates (0.97 m −3 per tide and meter of shoreline, which equals~2 m −3 per day and meter of shoreline; Riedel et al, 2010) compared to our study.…”

Section: Pore Water Discharge Influences Phytobenthos and Nearshore Wmentioning

confidence: 99%

See 1 more Smart Citation

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

et al. 2017

View full text Add to dashboard Cite

This study addresses key processes in high-energy beach systems using an interdisciplinary approach. We assess spatial variations in subsurface pore water residence times, salinity, organic matter (OM) availability, and redox conditions and their effects on nutrient cycles as well as on microbial community patterns and microphytobenthos growth. At the study site on Spiekeroog Island, southern North Sea, beach hydrology is characterized by the classical zonation with an upper saline plume (USP), a saltwater wedge, and a freshwater discharge tube in between. Sediment and pore water samples were taken along a cross-shore transect from the dunes to the low-water line reaching sediment depths down to 5 m below sediment surface. Spatial variations in pore water residence time, salinity, and organic matter availability lead to steep redox and nutrient gradients. Vertical and horizontal differences in the microbial community indicate the influence of these gradients and salinity on the community structure. shoreline. We propose that this nutrient efflux triggers growth of microphytobenthos on sediment surfaces of the discharge zone. A first comparison of nutrient discharge rates of the beach site with a nearby sandy backbarrier tidal flat margin indicates that the beach system might be of less importance in supplying recycled nutrients to nearshore waters than the backbarrier tidal flat area.

show abstract

Section: Pore Water Discharge Influences Phytobenthos and Nearshore Wcontrasting

confidence: 53%

Section: Pore Water Discharge Influences Phytobenthos and Nearshore Wmentioning

confidence: 99%

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Nevertheless, estuarine waters are a source of CO 2 to the atmosphere, globally (Cai, 2011). (10) Coastal marshes both store and export "blue carbon" (Odum et al, 1979;Dittmar et al, 2001;Moore et al, 2011). Marshes and wetlands are suggested to have an equivalent flux of CO 2 to the atmosphere as rivers, globally (Wehrli, 2013).…”

Section: Hydrologic and Biogeochemical Linkagesmentioning

confidence: 99%

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

et al. 2017

View full text Add to dashboard Cite

The purpose of this review is to highlight progress in unraveling carbon cycling dynamics across the continuum of landscapes, inland waters, coastal oceans, and the atmosphere. Earth systems are intimately interconnected, yet most biogeochemical studies focus on specific components in isolation. The movement of water drives the carbon cycle, and, as such, inland waters provide a critical intersection between terrestrial and marine biospheres. Inland, estuarine, and coastal waters are well studied in regions near centers of human population in the Northern hemisphere. However, many of the world's large river systems and their marine receiving waters remain poorly characterized, particularly in the tropics, which contribute to a disproportionately large fraction of the transformation of terrestrial organic matter to carbon dioxide, and the Arctic, where positive feedback mechanisms are likely to amplify global climate change. There are large gaps in current coverage of environmental observations along the aquatic continuum. For example, tidally-influenced reaches of major rivers and near-shore coastal regions around river plumes are often left out of carbon budgets due to a combination of methodological constraints and poor data coverage. We suggest that closing these gaps could potentially alter global estimates of CO 2 outgassing from surface waters to the atmosphere by several-fold. Finally, in order to identify and constrain/embrace uncertainties in global carbon budget estimations it is important that we further adopt statistical and modeling approaches that have become well-established in the fields of oceanography and paleoclimatology, for example.

show abstract

“…When coining this hypothesis, Thomas et al (2009) estimated that alkalinity generation in Wadden Sea sediments could be responsible for 20-25 % of the total CO 2 uptake of the entire North Sea. However, Moore et al (2011) estimated much smaller A T fluxes between the Wadden Sea and the North Sea based on activity measurements of radium isotopes in surface water. While the strength of the A T flux between the Wadden Sea and the North Sea remains under debate, the Wadden Sea has been identified as a source of A T for the North Sea (Brasse et al, 1999;Thomas et al, 2009;Provoost et al, 2010;Moore et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…However, Moore et al (2011) estimated much smaller A T fluxes between the Wadden Sea and the North Sea based on activity measurements of radium isotopes in surface water. While the strength of the A T flux between the Wadden Sea and the North Sea remains under debate, the Wadden Sea has been identified as a source of A T for the North Sea (Brasse et al, 1999;Thomas et al, 2009;Provoost et al, 2010;Moore et al, 2011). However, it remains an open question whether this A T export from the Wadden Sea drives any CO 2 uptake in the North Sea (maybe the A T -induced CO 2 uptake has already taken place in the Wadden Sea), and also, how important the sediments of the North Sea proper are in driving CO 2 uptake in the North Sea.…”

Section: Introductionmentioning

confidence: 99%

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

et al. 2016

View full text Add to dashboard Cite

Abstract. It has been previously proposed that alkalinity release from sediments can play an important role in the carbonate dynamics on continental shelves, lowering the pCO 2 of seawater and hence increasing the CO 2 uptake from the atmosphere. To test this hypothesis, sedimentary alkalinity generation was quantified within cohesive and permeable sediments across the North Sea during two cruises in September 2011 (basin-wide) and June 2012 (Dutch coastal zone). Benthic fluxes of oxygen (O 2 ), alkalinity (A T ) and dissolved inorganic carbon (DIC) were determined using shipboard closed sediment incubations. Our results show that sediments can form an important source of alkalinity for the overlying water, particularly in the shallow southern North Sea, where high A T and DIC fluxes were recorded in nearshore sediments of the Belgian, Dutch and German coastal zone. In contrast, fluxes of A T and DIC are substantially lower in the deeper, seasonally stratified, northern part of the North Sea. Based on the data collected, we performed a model analysis to constrain the main pathways of alkalinity generation in the sediment, and to quantify how sedimentary alkalinity drives atmospheric CO 2 uptake in the southern North Sea. Overall, our results show that sedimentary alkalinity generation should be regarded as a key component in the CO 2 dynamics of shallow coastal systems.

show abstract

Radium-based pore water fluxes of silica, alkalinity, manganese, DOC, and uranium: A decade of studies in the German Wadden Sea

Cited by 106 publications

References 53 publications

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

Contact Info

Product

Resources

About

Radium-based pore water fluxes of silica, alkalinity, manganese, DOC, and uranium: A decade of studies in the German Wadden Sea

Cited by 106 publications

References 53 publications

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

Where Carbon Goes When Water Flows: Carbon Cycling across the Aquatic Continuum

The impact of sedimentary alkalinity release on the water column CO&lt;sub&gt;2&lt;/sub&gt; system in the North Sea

Contact Info

Product

Resources

About

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea