A First Global Oceanic Compilation of Observational Dissolved Aluminum Data With Regional Statistical Data Treatment

Barraqueta, Jan Lukas Menzel; Samanta, Saumik; Achterberg, Eric P.; Croot, Peter; Cloete, Ryan; Jongh, Tara De; Gelado-Caballero, María Dolores; Klar, J. K.; Middag, Rob; Loock, Jean; Remenyi, Tomas A.; Wenzel, Bernhard; Roychoudhury, Alakendra N.

doi:10.3389/fmars.2020.00468

Cited by 20 publications

(8 citation statements)

References 88 publications

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“…The concentrations of dissolved Al in the upper ocean are strongly related to dust deposition (Measures and Vink 2000; Kienast et al 2016; Menzel Barraqueta et al 2020). Increases in dust deposition during the Last Glacial Maximum compared to the late Holocene (i.e., the modern time) occurred over the world oceans including all the modern high‐nutrient low‐chlorophyll regions (i.e., the Southern Ocean, the subarctic Pacific, and the Eastern Equatorial Pacific) (Kienast et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Increases in dust deposition during the Last Glacial Maximum compared to the late Holocene (i.e., the modern time) occurred over the world oceans including all the modern high‐nutrient low‐chlorophyll regions (i.e., the Southern Ocean, the subarctic Pacific, and the Eastern Equatorial Pacific) (Kienast et al 2016). A two‐ to three‐fold increase in the dust deposition rates over those in modern time may result in increases of Al in the range from 20 to 200 nM in the upper layer for the Atlantic Ocean, the Mediterranean Sea, and some sites of the Pacific Ocean and the Indian Ocean (Kienast et al 2016; Menzel Barraqueta et al 2020). In other words, Al may have significantly increased carbon export to ocean depths in the Last Glacial Maximum.…”

Section: Discussionmentioning

confidence: 99%

“…the Atlantic Ocean, the Mediterranean Sea, and some sites of the Pacific Ocean and the Indian Ocean (Kienast et al 2016;Menzel Barraqueta et al 2020). In other words, Al may have significantly increased carbon export to ocean depths in the Last Glacial Maximum.…”

Section: Implication For Carbon Export To Ocean Depths and The Iron-aluminum Hypothesismentioning

confidence: 99%

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Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Zhou

Liu

et al. 2021

Limnology & Oceanography

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Recent studies indicate that aluminum (Al) could play an important role in the ocean carbon cycle by increasing phytoplankton carbon fixation and reducing organic carbon decomposition. However, how Al may influence the decomposition of organic carbon has not yet been explicitly examined. Here we report the effects of Al on carbon fixation by marine diatoms and their subsequent decomposition. By using radiocarbon as a tracer, the carbon fixation and decomposition of three model marine diatoms were examined in Aquil* media at different concentrations (0, 40, 200, and 2000 nM) of dissolved Al. Addition of Al enhanced net carbon fixation by the diatoms in the declining growth phase (by 9%-29% for Thalassiosira pseudonana, 15%-20% for T. oceanica, 15%-23% for T. weissflogii). Under axenic conditions the decomposition rates (d À1 ) of the diatomproduced particulate organic carbon (POC) significantly decreased (by 21%-57% for T. pseudonana, 0%-41% for T. oceanica, 29%-58% for T. weissflogii) in the Al-enriched treatments. In the presence of bacteria, the decomposition rates of T. weissflogii-produced POC were still 37%-38% lower in Al-enriched treatments compared to the control. Significant increases in cell size, cellular carbon content (pmol C/cell) and cellular carbon density (pmol C/μm 3 ) of T. weissflogii were also observed in the Al-enriched treatments compared to the control. The Al-related increase in net carbon fixation and cell size, and the decrease in POC decomposition rate may facilitate carbon export to ocean depths. The study provides new evidence for the iron-aluminum hypothesis, which suggests that Al could increase phytoplankton uptake of atmospheric CO 2 and influence climate change.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Zhou

Liu

et al. 2021

Limnology & Oceanography

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“…However, this ratio can change depending on the Al concentration of the surrounding water (up to 70 mM M −1 ; Köhler et al, 2017;Machill et al, 2013). Unfortunately, the Al concentrations in seawater were not measured during the cruise and there are hardly any published data from the Peruvian margin (Barraqueta et al, 2020). A study by Ho et al (2019) along the GEOTRACES transect (GP16) from Peru to Tahiti found overall low Al concentration between 1 and 2 nmol kg −1 further away the Peruvian coast (for comparison Atlantic surface water Al is close to 20 nmol kg −1 ; Barraqueta et al, 2020).…”

Section: Al/si Ratios In Particulate Silicamentioning

confidence: 99%

“…Unfortunately, the Al concentrations in seawater were not measured during the cruise and there are hardly any published data from the Peruvian margin (Barraqueta et al, 2020). A study by Ho et al (2019) along the GEOTRACES transect (GP16) from Peru to Tahiti found overall low Al concentration between 1 and 2 nmol kg −1 further away the Peruvian coast (for comparison Atlantic surface water Al is close to 20 nmol kg −1 ; Barraqueta et al, 2020). However, the Ho et al (2019) open ocean data are most likely not representative for Al concentrations on the shelf.…”

Section: Al/si Ratios In Particulate Silicamentioning

confidence: 99%

Controls on the Silicon Isotope Composition of Diatoms in the Peruvian Upwelling

et al. 2021

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The upwelling area off Peru is characterized by exceptionally high rates of primary productivity, mainly dominated by diatoms, which require dissolved silicic acid (dSi) to construct their frustules. The silicon isotope compositions of dissolved silicic acid (δ30SidSi) and biogenic silica (δ30SibSi) in the ocean carry information about dSi utilization, dissolution, and water mass mixing. Diatoms are preserved in the underlying sediments and can serve as archives for past nutrient conditions. However, the factors influencing the Si isotope fractionation between diatoms and seawater are not fully understood. More δ30SibSi data in today’s ocean are required to validate and improve the understanding of paleo records. Here, we present the first δ30SibSi data (together with δ30SidSi) from the water column in the Peruvian Upwelling region. Samples were taken under strong upwelling conditions and the bSi collected from seawater consisted of more than 98% diatoms. The δ30SidSi signatures in the surface waters were higher (+1.7‰ to +3.0‰) than δ30SibSi (+1.0‰ to +2‰) with offsets between diatoms and seawater (Δ30Si) ranging from −0.4‰ to −1.0‰. In contrast, δ30SidSi and δ30SibSi signatures were similar in the subsurface waters of the oxygen minimum zone (OMZ) as a consequence of a decrease in δ30SidSi. A strong relationship between δ30SibSi and [dSi] in surface water samples supports that dSi utilization of the available pool (70 and 98%) is the main driver controlling δ30SibSi. A comparison of δ30SibSi samples from the water column and from underlying core-top sediments (δ30SibSi_sed.) in the central upwelling region off Peru (10°S and 15°S) showed good agreement (δ30SibSi_sed. = +0.9‰ to +1.7‰), although we observed small differences in δ30SibSi depending on the diatom size fraction and diatom assemblage. A detailed analysis of the diatom assemblages highlights apparent variability in fractionation among taxa that has to be taken into account when using δ30SibSi data as a paleo proxy for the reconstruction of dSi utilization in the region.

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Occurrence of structural aluminum (Al) in marine diatom biological silica: Visible evidence from microscopic analysis

Tian

Liu

Yuan

et al. 2021

Preprint

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A First Global Oceanic Compilation of Observational Dissolved Aluminum Data With Regional Statistical Data Treatment

Cited by 20 publications

References 88 publications

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis

Controls on the Silicon Isotope Composition of Diatoms in the Peruvian Upwelling

Occurrence of structural aluminum (Al) in marine diatom biological silica: Visible evidence from microscopic analysis

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