The marine phosphorus cycle

Froelich, Philip N.; Bender, Michael L.; Luedtke, Nile A.; Heath, G. Ross; DeVries, Tim

doi:10.2475/ajs.282.4.474

Cited by 488 publications

(210 citation statements)

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“…In the area of salinity <25, SRP concentrations remained relatively stable (Figure 4(e)). This demonstrates a typical estuarine buffering effect on SRP, which has been reported in the JRE [27,31] and is usually attributed to absorption-desorption processes on suspending/sinking particles [37,38]. In the high salinity region, however, SRP was quickly diluted by relatively oligotrophic near-shore seawaters (Figure 4(e)).…”

Section: Relationship Between Nutrients and Salinity In Jrementioning

confidence: 80%

Distribution, fluxes and decadal changes of nutrients in the Jiulong River Estuary, Southwest Taiwan Strait

et al. 2012

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The Jiulong River Estuary (JRE) is a typical subtropical macro-tide estuary on the southwest coast of the Taiwan Strait (TWS), which has been greatly impacted by human activities over the past 30 years. To understand nutrient dynamics and fluxes under such a heavy background of anthropogenic perturbation, eight cruises were conducted from April 2008 to April 2011, covering both wet (May to September) and dry (October to April next year) seasons. Nutrient concentrations were very high for the freshwater end-member in the upper reach of the JRE (nitrate (NO 3 In dry seasons, concentrations of these nutrients were higher than in wet seasons. Nitrate was the dominant chemical species of dissolved inorganic nitrogen (DIN), with percentages of 67%-96% in wet seasons and 55%-72% in dry seasons. Distributions of NO 3 -N and DSi against salinity were nearly constant during all cruises, and showed generally conservative mixing behaviors in the estuary (1

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Section: Relationship Between Nutrients and Salinity In Jrementioning

confidence: 80%

Distribution, fluxes and decadal changes of nutrients in the Jiulong River Estuary, Southwest Taiwan Strait

et al. 2012

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“…Phosphorous in marine sediments is mainly derived from the decomposition of organic matter, a process that is controlled by biologic activity and the availability of oxygen within the sediment. The released phosphorous can directly precipitate as authigenic P-bearing minerals or be integrated into Fe oxyhydroxides (Froelich et al, 1982;Berner et al, 1993). Therefore, the phosphorus cycle can be closely related to the stability of Fe oxyhydroxides, which is directly redox controlled (Krom and Berner, 1980).…”

Section: Origin Of the Authigenic Componentsmentioning

confidence: 99%

Characterization of metalliferous sediment from a low-temperature hydrothermal environment on the Eastern Flank of the East Pacific Rise

et al. 2008

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Metalliferous deposits are described from the eastern flank of the East Pacific Rise (EPR) offshore Costa Rica, close to a basaltic seamount called "Dorado high".Based on heat-flow data and porewater profiles, the site is an area of active low temperature hydrothermal discharge. We focus on the mineralogical and chemical analyses from a 124 cm long gravity core (GC50), located on the north-western slope of the 100 m high Dorado high. In this core, the sediments consist of detrital clay minerals as well as authigenic minerals such as zeolites, apatites, and Fe/Mn-rich oxyhydroxides. In contrast, the reference sediments from adjacent areas without hydrothermal activity are olive gray hemipelagic muds composed of volcanic glass particles, clay minerals, siliceous microfossils, and some detrital quartz and feldspar.Bulk sediment chemistry and chemical enrichment factors calculated with respect to the reference sediment indicate that the most important chemical changes occurred at the base of the core from 100 to 124 cm bsf, with strong enrichments in MnO, CaO, P 2 O 5 , and Fe 2 O 3 . These enrichments are correlated with the occurrence of authigenic Fe-oxyhydroxide (goethite) and Mn oxide (todorokite and vernadite, at 100 cm bsf), and hydrothermal apatite (110-124 cm bsf). In the upper section of the core from 12 to 70 cm, the sediment is composed of abundant smectite and authigenic phillipsite, and only minor chemical changes can be observed with respect to the reference sediments.The ubiquitous presence of phillipsite suggests that the entire sedimentary column of core GC50 was first affected by diagenesis. However, below 70 cm bsf, these phillipsites are partially dissolved and Fe oxides occur from 110 to 124 cm, followed 2 upward by Mn oxides at 100 cm. This transition from Fe to Mn rich sediments can be interpreted in terms of an upward increasing redox potential. PAAS-normalized REE patterns of GC50 sediments present clearly negative Ce and positive Y anomalies inherited from seawater at the base of core GC50. These anomalies decrease upward, which we interpret together with the transition from Fe to Mn-rich sediments by an upward migrating low temperature hydrothermal fluid. Thus, after a first stage of diagenesis, the discharge of a low temperature hydrothermal fluid occurred through the sedimentary column, leading to the precipitation of hydrothermal compounds that are lacking towards the surface.

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“…The "Warburg effect" [Fridovich, 1977] describes the direct limitation of C3 plant growth by oxygen. In C3 photosynthesis, oxygen and carbon dioxide compete for the enzyme Rubisco which acts either as oxygenase or carboxylase [Edwards and Walker, 1983].…”

Section: Warburg Effect On Photosynthesismentioning

confidence: 99%

“…The oxidizing atmosphere is the product of past photosynthesis and a constraint on the growth of many organisms, being required by aerobes but toxic to cell function [Fridovich, 1977] Oxygen mixing ratio (%)…”

Section: Introductionmentioning

confidence: 99%