Present nitrogen and carbon dynamics in the Scheldt estuary using a novel 1-D model

Hofmann, A.F.; Soetaert, Karline; Middelburg, Jack J.

doi:10.5194/bg-5-981-2008

Cited by 47 publications

(63 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…p N denotes the fraction of NH + 4 in the total DIN uptake of primary production. Hofmann et al (2008b) provided a detailed model assessment of the carbon and nitrogen cycling in the Scheldt estuary. Their model and results provide a solid basis and are used as a starting point.…”

Section: The Scheldt Estuarymentioning

confidence: 99%

“…Their model and results provide a solid basis and are used as a starting point. The one-dimensional reactive transport model here incorporates the same biogeochemical reaction set, and uses the same forcings and kinetic descriptions of process rates as in Hofmann et al (2008b). The biogeochemical reaction set accounts for oxic mineralisation, denitrification, nitrification, and primary production with stoichiometries as given in Table 1 (for details see Hofmann et al, 2008b).…”

Section: The Scheldt Estuarymentioning

confidence: 99%

“…The one-dimensional reactive transport model here incorporates the same biogeochemical reaction set, and uses the same forcings and kinetic descriptions of process rates as in Hofmann et al (2008b). The biogeochemical reaction set accounts for oxic mineralisation, denitrification, nitrification, and primary production with stoichiometries as given in Table 1 (for details see Hofmann et al, 2008b). Furthermore, the model includes two physical transport processes: the exchange of carbon dioxide and oxygen across the air-water interface and advectivedispersive transport of dissolved constituents.…”

Section: The Scheldt Estuarymentioning

confidence: 99%

“…The resulting mass balance equations for all state variables are given in Table 2. More detailed information on the model formulation can be found in Hofmann et al (2008b).…”

Section: The Scheldt Estuarymentioning

confidence: 99%

“…A number of modelling approaches have been presented that allow to predict the time evolution of pH in aquatic ecosystems (e.g. Boudreau and Canfield, 1988;Regnier et al, 1997;Vanderborght et al, 2002;Hofmann et al, 2008b). The second aspect, however, has received far less attention.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

et al. 2009

Self Cite

View full text Add to dashboard Cite

Abstract.A new pH modelling approach is presented that explicitly quantifies the influence of biogeochemical processes on proton cycling and pH in an aquatic ecosystem, and which accounts for time variable acid-base dissociation constants. As a case study, the method is applied to investigate proton cycling and long-term pH trends in the Scheldt estuary (SW Netherlands, N Belgium). This analysis identifies the dominant biogeochemical processes involved in proton cycling in this heterotrophic, turbid estuary. Furthermore, information on the factors controlling the longitudinal pH profile along the estuary as well as long-term pH changes are obtained. Proton production by nitrification is identified as the principal biological process governing the pH. Its acidifying effect is mainly counteracted by proton consumption due to CO 2 degassing. Overall, CO 2 degassing generates the largest proton turnover in the whole estuary on a yearly basis. The main driver of long-term changes in the mean estuarine pH over the period 2001 to 2004 is the decreasing freshwater flow, which influences the pH directly via a decreasing supply of dissolved inorganic carbon and alkalinity, and also indirectly, via decreasing ammonia loadings and lower nitrification rates.

show abstract

Section: The Scheldt Estuarymentioning

confidence: 99%

Section: The Scheldt Estuarymentioning

confidence: 99%

Section: The Scheldt Estuarymentioning

confidence: 99%

“…The resulting mass balance equations for all state variables are given in Table 2. More detailed information on the model formulation can be found in Hofmann et al (2008b).…”

Section: The Scheldt Estuarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

Distribution and sources of particulate organic matter in the Indian monsoonal estuaries during monsoon

et al. 2014

View full text Add to dashboard Cite

The distribution and sources of particulate organic carbon (POC) and nitrogen (PN) in 27 Indian estuaries were examined during the monsoon using the content and isotopic composition of carbon and nitrogen. Higher phytoplankton biomass was noticed in estuaries with deeper photic zone than other estuaries receiving higher suspended matter. The δ 13 C POC and δ 15 N PN data suggest that relatively higher δ 13 C POC (À27.9 to À22.6‰) and lower δ 15 N PN (0.7 to 5.8‰) were noticed in the estuaries located in the northern India, north of 16°N, and lower δ 13 C POC (À31.4 to À28.2‰) and higher δ 15 N PN (5 to 10.3‰) in the estuaries located in the southern India. This is associated with higher Chl a in the northern than southern estuaries suggesting that in situ production contributed significantly to the POC pool in the former, whereas terrestrial sources are important in the latter estuaries. The spatial distribution pattern of δ 15 N PN is consistent with fertilizer consumption in the Indian subcontinent, which is twice as much in the northern India as in the south whereas δ 13 C POC suggests that in situ production is a dominant source in the southern and terrestrial sources are important in the northern estuaries. Based on the Stable Isotope Analysis in R model, 40-90% (70-90%) of organic matter is contributed by C 3 plants (freshwater algae) in the estuaries located in the northern (southern) India.

show abstract

Ecosystem Metabolism

et al. 2012

View full text Add to dashboard Cite

Present nitrogen and carbon dynamics in the Scheldt estuary using a novel 1-D model

Cited by 47 publications

References 57 publications

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

Distribution and sources of particulate organic matter in the Indian monsoonal estuaries during monsoon

Ecosystem Metabolism

Contact Info

Product

Resources

About