Journal ArticleDOI
The World Ocean Silica Cycle
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TLDR
The resulting budget recognizes significantly higher input and output fluxes and notes that the recycling of silicon occurs mostly at the sediment-water interface and not during the sinking of silica particles through deep waters.Abstract:
Over the past few decades, we have realized that the silica cycle is strongly intertwined with other major biogeochemical cycles, like those of carbon and nitrogen, and as such is intimately related to marine primary production, the efficiency of carbon export to the deep sea, and the inventory of carbon dioxide in the atmosphere. For nearly 20 years, the marine silica budget compiled by Treguer et al. (1995), with its exploration of reservoirs, processes, sources, and sinks in the silica cycle, has provided context and information fundamental to study of the silica cycle. Today, the budget needs revisiting to incorporate advances that have notably changed estimates of river and groundwater inputs to the ocean of dissolved silicon and easily dissolvable amorphous silica, inputs from the dissolution of terrestrial lithogenic silica in ocean margin sediments, reverse weathering removal fluxes, and outputs of biogenic silica (especially on ocean margins and in the form of nondiatomaceous biogenic silica). Th...read more
Citations
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Journal ArticleDOI
Rethinking the marine carbon cycle: Factoring in the multifarious lifestyles of microbes
Alexandra Z. Worden,Alexandra Z. Worden,Alexandra Z. Worden,Michael J. Follows,Stephen J. Giovannoni,Susanne Wilken,Amy E. Zimmerman,Patrick J. Keeling,Patrick J. Keeling +8 more
TL;DR: The challenges of understanding the role protists play in geochemical cycling in the oceans are reviewed, and researchers must bring the conceptual framework of systems biology into bigger “ecosystems biology” models that broadly capture the geochemical activities of interacting plankton networks.
Journal Article
Contribution of Southern Ocean surface-water stratification to low atmospheric CO 2 concentrations during the last glacial period
TL;DR: The nitrogen-isotope record preserved in Southern Ocean sediments, along with several geochemical tracers for the settling fluxes of biogenic matter, reveals patterns of past nutrient supply to phytoplankton and surface-water stratification in this oceanic region as mentioned in this paper.
Journal ArticleDOI
PISCES-v2: an ocean biogeochemical model for carbon and ecosystem studies
TL;DR: PISCES-v2 as mentioned in this paper is a biogeochemical model which simulates the lower trophic levels of marine ecosystems and the bio-ochemical cycles of carbon and of the main nutrients (P, N, Fe, and Si) and is intended to be used for both regional and global configurations at high or low spatial resolutions as well as for short-term (seasonal, interannual) and long-term analyses.
Journal ArticleDOI
Insights into global diatom distribution and diversity in the world’s ocean
Shruti Malviya,Eleonora Scalco,Stéphane Audic,Flora Vincent,Alaguraj Veluchamy,Julie Poulain,Patrick Wincker,Patrick Wincker,Patrick Wincker,Daniele Iudicone,Colomban de Vargas,Lucie Bittner,Adriana Zingone,Chris Bowler +13 more
TL;DR: The dominance of diatoms as a major photosynthetic group and identify the most widespread and diverse genera are confirmed and a new estimate of marine planktonic diatom diversity and a global view of their distribution in the world’s ocean is provided.
Journal ArticleDOI
Influence of diatom diversity on the ocean biological carbon pump
Paul Tréguer,Chris Bowler,Brivaëla Moriceau,Stephanie Dutkiewicz,Marion Gehlen,Olivier Aumont,Lucie Bittner,Richard C. Dugdale,Zoe V. Finkel,Daniele Iudicone,Oliver Jahn,Lionel Guidi,M. Lasbleiz,Karine Leblanc,Marina Lévy,Philippe Pondaven +15 more
TL;DR: In this paper, the authors show that the extent to which diatoms contribute to the export of carbon varies by diatom type, with carbon transfer modulated by the Si/C ratio of diatom cells, the thickness of the shells and their life strategies; for instance, the tendency to form aggregates or resting spores.
References
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Journal ArticleDOI
Sedimentary organic matter preservation: an assessment and speculative synthesis
John I. Hedges,Richard G. Keil +1 more
TL;DR: For example, in a recent paper as discussed by the authors, the authors investigated the mechanisms governing sedimentary organic matter preservation in marine sediments and found that organic preservation in the marine environment is < 0.5% efficient, and that the factors which directly determine preservation vary with depositional regime, but have in common a critical interaction between organic and inorganic materials over locally variable time scales.
Journal ArticleDOI
The relative influences of nitrogen and phosphorus on oceanic primary production
TL;DR: In this article, the competition between nitrogenfixing and other phytoplankton is inserted into a two-box global model of the oceanic nitrogen and phosphorus cycles, with surface waters more deficient in nitrate than phosphate in the steady state.
Journal ArticleDOI
An estimate of global primary production in the ocean from satellite radiometer data
TL;DR: In this paper, an estimate of global net primary production in the ocean has been computed from the monthly mean near-surface chlorophyll fields for 1979-1986 obtained by the Nimbus 7 CZCS radiometer.
Journal ArticleDOI
The silica balance in the world ocean: a reestimate.
Paul Tréguer,David M. Nelson,Aleido J. van Bennekom,David J. DeMaster,Aude Leynaert,Bernard Quéguiner +5 more
TL;DR: The net inputs of silicic acid (dissolved silica) to the world ocean have been revised to 6.1 � 2.0 teramoles of silicon per year (1 teramole = 1012 moles).
Journal ArticleDOI
Production and dissolution of biogenic silica in the ocean: Revised global estimates, comparison with regional data and relationship to biogenic sedimentation
TL;DR: In this article, the global rate of biogenic silica production in the ocean was estimated to be between 200 and 280 × 1012 mol Si yr−1, which is 30-50% lower than several previous estimates, due to new data indicating lower values for both the relative contribution of diatoms to primary productivity and their Si/C ratios.