Sponge species from New Zealand may transform and degrade dissolved organic matter

Journal of Experimental Marine Biology and Ecology, Год журнала: 2025, Номер 585, С. 152092 - 152092

Опубликована: Фев. 28, 2025

Язык: Английский

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Development of Dissolved Organic Matter Reference Material

Springer oceanography, Год журнала: 2025, Номер unknown, С. 277 - 287

Опубликована: Янв. 1, 2025

Язык: Английский

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Photooxidation removes biologically recalcitrant dissolved organic carbon released by the macroalga Sargassum natans

Limnology and Oceanography Letters, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Abstract Macroalgae are important primary producers in the coastal ocean, and they release a large fraction of their net production as dissolved organic carbon (DOC). It is assumed that much this DOC recalcitrant results sequestration amounts carbon. We lack sufficient knowledge about bioavailability material role other sinks such photooxidation. conducted dark remineralization photooxidation experiments on derived from an abundant brown macroalga quantified amended was remineralized by both processes. The ranged 14% to 99% significantly negatively correlated with its phenolic content. Upon exposure light, biologically compounds were quickly oxidized CO 2 , indicating sink for macroalgal DOC. These especially macroalgae cultivation being considered sequester atmospheric .

Язык: Английский

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Multi‐Elemental Tracers in the Amerasian Basin Reveal Interlinked Biogeochemical and Physical Processes in the Arctic Ocean Upper Halocline

Global Biogeochemical Cycles, Год журнала: 2025, Номер 39(4)

Опубликована: Апрель 1, 2025

Abstract The physical and biogeochemical properties of the western Arctic Ocean are rapidly changing, resulting in cascading shifts to local ecosystems. nutrient‐rich Pacific water inflow through Bering Strait is modified on Chukchi East Siberian shelves by brine rejection during sea ice formation, a strong halocline (called Upper Halocline Layer (UHL)) that separates cold relatively fresh surface layer from warmer more saline (and nutrient‐poor) Atlantic‐derived below. Biogeochemical signals entrained into UHL result Waters sediment river influence shelf. In this synthesis, we bring together data 2015 U.S. GEOTRACES program implement multi‐tracer (dissolved particulate trace elements, radioactive stable isotopes, macronutrients, dissolved gas/atmospheric tracers) approach assess relative shelf sediments, rivers, seawater contribution Amerasian halocline. For each element, characterized their behavior as mixing dominated (e.g., dCu, dGa), shelf‐influenced dFe, dZn), or combination both dBa, dNi). Leveraging framework, assessed sources sinks contributing elemental distributions: sediments dZn, dCd, dHg), riverine sources, organic carbon), scavenging particles originating dMn, dV, etc.). Additionally, synthesized results isotopic atmospheric tracers yielded tracer age estimates for ranging between 1 2 decades spatial gradient consistent with cyclonic circulation.

Язык: Английский

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Variation in chemical composition of dissolved organic matter during the winter to spring transition in the northern Barents Sea

Marine Chemistry, Год журнала: 2025, Номер unknown, С. 104517 - 104517

Опубликована: Апрель 1, 2025

Язык: Английский

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Centennial‐Scale Storage of DOC Within Arctic Ocean Deep Waters Controlled by Subzero Temperatures

Global Biogeochemical Cycles, Год журнала: 2025, Номер 39(4)

Опубликована: Апрель 1, 2025

Abstract Refractory dissolved organic carbon (RDOC) represents the second largest reservoir for ocean storage, bulk of which is held in deep ocean, out contact with atmosphere on decadal to millennial timescales. Thus, understanding mechanisms governing its production, delivery, and storage within crucial fully elucidating oceanic cycle impacts global climate dynamics. Here we report observations marine DOC across Arctic, finding that Eurasian Basin waters (>1,700 m) harbor maxima water concentrations. Given basin's relatively long residence time (>150 years) absence known RDOC delivery pathways into interior, attempt describe how elevated Arctic Ocean maintained. Using box model simulations, find a significant role brine rejection from continental shelf surface delivering abyss, simultaneously ventilates waters. Comparison kinetic loss rates consumption estimated as function subsurface temperatures demonstrates an temperature sensitivity relative other basins, possibly linked terrigenous and/or “fresh” content, subzero currently suppressing remineralization, helping explain maxima. The stores ∼5.3 Pg C over multi‐centennial scale times waters, may be reduced by ∼1%–4% next century warming.

Язык: Английский

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Unravelling the Effects of Climate Extremes and Land Use on Greenhouse Gas Emissions in the Yangtze River Riparian: Soil Columns Experiments

Ecohydrology, Год журнала: 2025, Номер 18(3)

Опубликована: Апрель 1, 2025

ABSTRACT River riparian basins play a crucial role in mitigating greenhouse gas (GHG) emissions through carbon sequestration and nitrogen sinks. However, increased ecological stresses led to the release of CO 2 , CH 4 N O. This study aimed investigate how extreme temperatures, water levels, moisture content, land use changes soil composition influence GHG corridor recommend mitigation techniques. It was carried out at Yangtze Riparian zone, China, using column testing. used The results showed that temperatures caused highest CO₂ (29–45%), CH₄ (24–43%) N₂O (27–33%). due accelerated organic carbon/nitrogen decomposition. Conversely, control wet–dry cycles absorbed (1–3%), (3–10%) O (1–21%) by improving aeration, oxygen availability, structure, stable table low temperature change. Grasses areas also improved Highest levels had lowest concentrations level. Adaptive wet‐dry cycles, grass cover better management can restore areas, maintain moisture, balance mitigate climate change quality. Dissolved matter fluorescence (DOMFluor) components are essential for dynamics, aquatic biome safety, nutrient cycling zones. recommends implementing restoration practices, managing afforestation, regulating monitoring tables address Future policies should focus on promoting resilient ecosystems.

Язык: Английский

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Occurrence and distribution of per- and polyfluoroalkyl substances (PFAS) in tidal salt marsh creeks

Marine Pollution Bulletin, Год журнала: 2025, Номер 216, С. 117932 - 117932

Опубликована: Апрель 14, 2025

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous global contaminants where the ocean plays a critical role in PFAS cycling. Large estuarine systems conduits for anthropogenic contaminants, but little is known regarding small tidal creek systems. Surface waters from seven creeks were analyzed 16 target including legacy replacement PFAS. Mean total ranged 139.4 to 12,293.8 ng/L terrestrial influenced upland sampling sites 33.9-176.3 mouth sites. Nine negatively correlated with salinity positively DOC (p < 0.05), indicating that source of predominantly terrestrial. also had strong positive relationship percent impervious surface (R2 = 0.99), importance human land use influencing occurrence. Results this study will inform future investigations their dynamics at land-sea interface.

Язык: Английский

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Recommendations and good practices for dissolved organic carbon (DOC) analyses at low concentrations

MethodsX, Год журнала: 2024, Номер 12, С. 102663 - 102663

Опубликована: Март 19, 2024

Язык: Английский

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Inorganic and organic nutrients in tropical–subtropical Western Pacific coral reef waters

Coral Reefs, Год журнала: 2024, Номер 43(4), С. 1053 - 1069

Опубликована: Июль 8, 2024

Язык: Английский

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