Seasonal cycle of N:P:TA stoichiometry as a modulator of CO<sub>2</sub> buffering in eastern boundary upwelling systems

Gregor, Luke; Monteiro, Pedro M. S.

doi:10.1002/2013gl058036

Cited by 4 publications

(2 citation statements)

References 34 publications

(56 reference statements)

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“…Some examples of calculations according to the obtained equations are collected in Table 3. [35,38] It is worth mentioning that the derived equation for the methanogenic digestion of general microalgal biomass formula correlates with the equation available in literature [39]:…”

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confidence: 57%

Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

2020

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The estimation of biomethane or biohydrogen yield is used to evaluate energy recovery during the process of the anaerobic treatment of waste and wastewater. Mathematically calculated theoretical values can also be used in biomethane or biohydrogen potential tests as reference points to calculate which fraction of substrate is decomposed, when the substrate degradation stopped and when the sample’s self-digestion begins. This study suggests expanded forms of equations for anaerobic processes leading to either biomethane or biohydrogen. The traditional equations describing the conversion of a substrate with known carbon, hydrogen, oxygen and nitrogen composition were expanded to account for the composition of sulfur (for biohydrogen yields) and phosphorus (both biohydrogen and biomethane yields). As an optional part, one metal cation was also incorporated into the chemical formula of the evaluated wastewater composition in case the compound of biodegradable interest exists as a salt. The equations derived here can be useful for researchers estimating energy recovery based on the elemental analysis of samples, such as algal biomass harvested during harmful algal blooms (HABs). Examples of biomethane and biohydrogen yield estimations from sulfur- and phosphorus-containing compounds are also provided.

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Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

2020

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“…In contrast, the Namibian shelf's mud belt is a region of continuous N loss and P efflux to the pelagic environment of the Benguela upwelling system, leading to characteristically low N : P ratios. Gregor and Monteiro (2013), who reported pelagic N : P values of 7.2-12.3, identified denitrification and sulfate reduction as anoxic benthic processes leading to this relative nitrogen deficiency, a finding supported by Flohr et al (2014).…”

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confidence: 77%

The significance of nitrogen regeneration for new production within a filament of the Mauritanian upwelling system

2016

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Abstract. The Lagrangian progression of a biological community was followed in a filament of the Mauritanian upwelling system, north-west Africa, during offshore advection. The inert dual tracers sulfur hexafluoride and helium-3 labelled a freshly upwelled patch of water that was mapped for 8 days. Changes in biological, physical, and chemical characteristics were measured, including phytoplankton productivity, nitrogen assimilation, and regeneration. Freshly upwelled water contained high nutrient concentrations but was depleted in N compared to Redfield stoichiometry. The highest rate of primary productivity was measured on the continental shelf, associated with high rates of nitrogen assimilation and a phytoplankton community dominated by diatoms and flagellates. Indicators of phytoplankton abundance and activity decreased as the labelled water mass transited the continental shelf slope into deeper water, possibly linked to the mixed layer depth exceeding the light penetration depth. By the end of the study, the primary productivity rate decreased and was associated with lower rates of nitrogen assimilation and lower nutrient concentrations. Nitrogen regeneration and assimilation took place simultaneously. Results highlighted the importance of regenerated NH + 4 in sustaining phytoplankton productivity and indicate that the upwelled NO − 3 pool contained an increasing fraction of regenerated NO − 3 as it advected offshore. By calculating this fraction and incorporating it into an f ratio formulation, we estimated that of the 12.38 Tg C of annual regional production, 4.73 Tg C was exportable.

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Connecting pigment composition and dissolved trace elements to phytoplankton population in the southern Benguela Upwelling zone (St. Helena Bay)

Das

Routh

Roychoudhury

et al. 2017

Journal of Marine Systems

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Seasonal cycle of N:P:TA stoichiometry as a modulator of CO₂ buffering in eastern boundary upwelling systems

Cited by 4 publications

References 34 publications

Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

The significance of nitrogen regeneration for new production within a filament of the Mauritanian upwelling system

Connecting pigment composition and dissolved trace elements to phytoplankton population in the southern Benguela Upwelling zone (St. Helena Bay)

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Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems

Cited by 4 publications

References 34 publications

Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

Sulfur, Phosphorus and Metals in the Stoichiometric Estimation of Biomethane and Biohydrogen Yields

The significance of nitrogen regeneration for new production within a filament of the Mauritanian upwelling system

Connecting pigment composition and dissolved trace elements to phytoplankton population in the southern Benguela Upwelling zone (St. Helena Bay)

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Seasonal cycle of N:P:TA stoichiometry as a modulator of CO₂ buffering in eastern boundary upwelling systems