Ivia Closset
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View article: Silicification in the ocean: from molecular pathways to silicifiers' ecology and biogeochemical cycles
Silicification in the ocean: from molecular pathways to silicifiers' ecology and biogeochemical cycles Open
The oceanic silicon (Si) cycle has undergone a profound transformation from an abiotic system in the Precambrian to a biologically regulated cycle driven by siliceous organisms such as diatoms, Rhizaria, and sponges. These organisms active…
View article: Silicification in the Ocean: from molecular pathways to silicifiers' ecology and biogeochemical cycles
Silicification in the Ocean: from molecular pathways to silicifiers' ecology and biogeochemical cycles Open
The oceanic silicon cycle has undergone a profound transformation from an abiotic system in the Precambrian to a biologically regulated cycle driven by siliceous organisms such as diatoms, Rhizaria, and sponges. These organisms actively up…
View article: Automated analysis of natural variations in isotopes of silicon by the thermal decomposition of BaSiF <sub>6</sub>
Automated analysis of natural variations in isotopes of silicon by the thermal decomposition of BaSiF <sub>6</sub> Open
The Nu Sil inlet system and Nu Perspective IRMS measure δ 30 Si with better than 0.05 ‰ accuracy through the thermal decomposition of barium fluosilicate. Sample preparation accommodates diverse materials with negligible sample matrix effe…
View article: Diatoms Like It Light! How Diatom Eating Habits Help Us Understand the Past Ocean
Diatoms Like It Light! How Diatom Eating Habits Help Us Understand the Past Ocean Open
Have you ever wondered if today’s oceans were different millions of years ago? Well, a group of small algae called diatoms can help us to find this out. Diatoms build a strong glass skeleton, like a shell, which can last for thousands and …
View article: The Antarctic Silicon Trap
The Antarctic Silicon Trap Open
The Southern Ocean, the ocean encircling Antarctica, has been described by explorers as cold, empty, and dangerous. Despite this, it is a paradise for tiny algae called diatoms that are crucial players in the regulation of our climate. Why…
View article: New Constraints on Assemblage‐Driven Variation in the Relationship Amongst Diatom‐Bound, Biomass, and Nitrate Nitrogen Isotope Values
New Constraints on Assemblage‐Driven Variation in the Relationship Amongst Diatom‐Bound, Biomass, and Nitrate Nitrogen Isotope Values Open
Tracking variations in the surface ocean supply and demand of nitrate, a key marine nutrient, can help constrain the contribution of biological production in driving past climate shifts. The nitrogen isotopic composition (as δ 15 N) of org…
View article: A silicon isotopic perspective on the contribution of diagenesis to the sedimentary silicon budget in the Southern Ocean
A silicon isotopic perspective on the contribution of diagenesis to the sedimentary silicon budget in the Southern Ocean Open
View article: New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean Open
The silicon isotope composition of silicic acid, δ 30 Si(OH) 4 , in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, δ 30 Si(OH) 4 was examine…
View article: Diatom response to alterations in upwelling and nutrient dynamics associated with climate forcing in the California Current System
Diatom response to alterations in upwelling and nutrient dynamics associated with climate forcing in the California Current System Open
The California Current System displays a strong seasonal cycle in water properties, circulation, and biological production. Interactions of the alongshore current with coastal and topographic features lead to high spatial variability force…
View article: Opal diagenesis within Southern Ocean sediments tracked by stable silicon isotopes
Opal diagenesis within Southern Ocean sediments tracked by stable silicon isotopes Open
View article: A Test of the Diatom‐Bound Paleoproxy: Tracing the Isotopic Composition of Nutrient‐Nitrogen Into Southern Ocean Particles and Sediments
A Test of the Diatom‐Bound Paleoproxy: Tracing the Isotopic Composition of Nutrient‐Nitrogen Into Southern Ocean Particles and Sediments Open
Sedimentary nitrogen isotope (as δ 15 N) records from the Southern Ocean provide critical constraints on surface nutrient consumption in the past and the role of Southern Ocean biophysical changes in setting atmospheric p CO 2 . We present…
View article: Controls on Dissolved Silicon Isotopes Along the U.S. GEOTRACES Eastern Pacific Zonal Transect (GP16)
Controls on Dissolved Silicon Isotopes Along the U.S. GEOTRACES Eastern Pacific Zonal Transect (GP16) Open
The distribution of dissolved silicon isotopes (δ 30 Si) was examined along the U.S. GEOTRACES East Pacific Zonal Transect (GP16) extending from Peru to Tahiti (10°S and 15°S latitude). Surface waters in the subtropical gyre displayed high…
View article: California Wildfire Burns Boundaries Between Science and Art
California Wildfire Burns Boundaries Between Science and Art Open
Results from our 2017 cruise to the Santa Barbara Channel illustrate the value that student leadership training can bring to ocean science.The Across the Channel: Investigating Diel Dynamics (ACIDD) mission, conducted from December 16 to 2…
View article: New Insights Into Processes Controlling the δ<sup>30</sup>Si of Sinking Diatoms: A Seasonally Resolved Box Model Approach
New Insights Into Processes Controlling the δ<sup>30</sup>Si of Sinking Diatoms: A Seasonally Resolved Box Model Approach Open
In the Southern Ocean, the silicon (Si) biogeochemical cycle is dominated by processes such as the supply of Si into the surface waters, Si uptake into diatom frustules, and their subsequent dissolution and export. Due to the incomplete as…
View article: The GEOTRACES Intermediate Data Product 2017
The GEOTRACES Intermediate Data Product 2017 Open
The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2016. The IDP2017 includes d…
View article: The GEOTRACES Intermediate Data Product 2017
The GEOTRACES Intermediate Data Product 2017 Open
View article: GEOTRACES inter-calibration of the stable silicon isotope composition of dissolved silicic acid in seawater
GEOTRACES inter-calibration of the stable silicon isotope composition of dissolved silicic acid in seawater Open
The first inter-calibration study of the stable silicon isotope composition of dissolved silicic acid in seawater,δ30Si(OH)4, is presented as a contribution to the international GEOTRACES program.
View article: Unveiling the Si cycle using isotopes in an iron-fertilized zone of theSouthern Ocean: from mixed-layer supply to export
Unveiling the Si cycle using isotopes in an iron-fertilized zone of theSouthern Ocean: from mixed-layer supply to export Open
A massive diatom bloom forms annually in the surface waters of the naturally iron-fertilized Kerguelen Plateau (Southern Ocean). In this study, silicon isotopic signatures (δ30Si) of silicic acid (DSi) and suspended biogenic silica (BSi) w…
View article: Unveiling the Si cycle using isotopes in an iron fertilized zone of the Southern Ocean: from mixed layer supply to export
Unveiling the Si cycle using isotopes in an iron fertilized zone of the Southern Ocean: from mixed layer supply to export Open
A massive diatom-bloom is observed annually in the surface waters of the naturally Fe-fertilized Kerguelen Plateau (Southern Ocean). In this study, silicon isotopic signatures (δ30Si) of silicic acid (DSi) and suspended biogenic silica (BS…
View article: Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean Open
Although the Southern Ocean is considered a high-nutrient, low-chlorophyll (HNLC) area, massive and recurrent blooms are observed over and downstream of the Kerguelen Plateau. This mosaic of blooms is triggered by a higher iron supply resu…
View article: Seasonal variations, origin, and fate of settling diatoms in the Southern Ocean tracked by silicon isotope records in deep sediment traps
Seasonal variations, origin, and fate of settling diatoms in the Southern Ocean tracked by silicon isotope records in deep sediment traps Open
The Southern Ocean plays a pivotal role in the control of atmospheric CO 2 levels, via both physical and biological sequestration processes. The biological carbon transfer to the ocean interior is tightly coupled to the availability of oth…
View article: The biogeochemical silicon cycle in the Southern Ocean tracked by isotopic approaches
The biogeochemical silicon cycle in the Southern Ocean tracked by isotopic approaches Open
Southern Ocean biogeochemistry plays a crucial role on global marine primary production by impacting the nutrient availability even in low latitude surface water. Variations in the silicon (Si) cycle are large and its coupling to other nut…
View article: Le cycle biogéochimique du silicium dans l’Océan Austral par les approches isotopiques
Le cycle biogéochimique du silicium dans l’Océan Austral par les approches isotopiques Open
Southern Ocean biogeochemistry plays a crucial role on global marine primary production by impacting the nutrient availability even in low latitude surface water. Variations in the silicon (Si) cycle are large and its coupling to other nut…
View article: Glacial ice and atmospheric forcing on the Mertz Glacier Polynya over the past 250 years
Glacial ice and atmospheric forcing on the Mertz Glacier Polynya over the past 250 years Open
The Mertz Glacier Polynya off George V Land, East Antarctica, is a source of Adélie Land Bottom Water, which contributes up to ~25% of the Antarctic Bottom Water. This major polynya is closely linked to the presence of the Mertz Glacier To…
View article: Early spring mesopelagic carbon remineralization and transfer efficiency in the naturally iron-fertilized Kerguelen area
Early spring mesopelagic carbon remineralization and transfer efficiency in the naturally iron-fertilized Kerguelen area Open
We report on the zonal variability of mesopelagic particulate organic carbon remineralization and deep carbon transfer potential during the Kerguelen Ocean and Plateau compared Study 2 expedition (KEOPS 2; October–November 2011) in an area…