Atmospheric Environment, Journal Year: 2024, Volume and Issue: 321, P. 120360 - 120360
Published: Jan. 18, 2024
Language: Английский
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(10), P. 4637 - 4647
Published: March 1, 2024
Marine dissolved organic matter (DOM) is an important component of the global carbon cycle, yet its intricate composition and sea salt matrix pose major challenges for chemical analysis. We introduce a direct injection, reversed-phase liquid chromatography ultrahigh resolution mass spectrometry approach to analyze marine DOM without need solid-phase extraction. Effective separation achieved with large chromatographic column extended isocratic aqueous step. Postcolumn dilution sample flow buffer-free solvents implementing counter gradient reduced buildup in ion source resulted excellent repeatability. With this method, over 5,500 unique molecular formulas were detected from just 5.5 nmol 100 μL filtered Arctic Ocean seawater. observed highly linear detector response variable concentrations high robustness against matrix. Compared extracted DOM, our injection method demonstrated superior sensitivity heteroatom-containing DOM. The analysis seawater offers fast simple preparation avoids fractionation introduced by facilitates studies environments, where only minimal volume available e.g. sediment pore water, ice cores, or permafrost soil solution. small requirement also supports higher spatial (e.g., soils) temporal culture experiments). Chromatographic adds further information formulas, enhancing understanding biogeochemistry, chemodiversity, ecological processes.
Language: Английский
Citations
19
The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 909, P. 168673 - 168673
Published: Nov. 18, 2023
The dissolved organic carbon (DOC) leached from two types of microplastics (polyethylene and polypropylene) frequently found in coastal areas were evaluated situ. Subsequently, the bioavailability DOC was assessed for microbial inocula different communities (i.e., estuarine open-coastal waters, river-mouth waters seagrass beds). Leached largely biodegradable (as much as 85 %). However, beds exhibited lower utilization efficiency than probably because differences their communities. labile/recalcitrant ratio plastic similar under illuminated dark conditions, whereas polyethylene, rather polypropylene, preferentially used by We estimated that many 21,000 metric tons plastics may be released into ocean annually. Our results support need to consider potential impacts pollution on communities, including consideration trophic webs cycle.
Language: Английский
Citations
18
Earth system science data, Journal Year: 2024, Volume and Issue: 16(2), P. 1107 - 1119
Published: Feb. 27, 2024
Abstract. Measurements of dissolved organic carbon (DOC), nitrogen (DON), and phosphorus (DOP) concentrations are used to characterize the matter (DOM) pool important components biogeochemical cycling in coastal ocean. Here, we present first edition a global database (CoastDOM v1; available at https://doi.org/10.1594/PANGAEA.964012, Lønborg et al., 2023) compiling previously published unpublished measurements DOC, DON, DOP waters. These data complemented by hydrographic such as temperature salinity and, extent possible, other variables (e.g. chlorophyll a, inorganic nutrients) system total alkalinity). Overall, CoastDOM v1 includes observations from all continents. However, most were collected Northern Hemisphere, with clear gap DOM Southern Hemisphere. The included 1978 2022 consist 62 338 points for 20 356 13 533 DOP. number decreases progressively sequence DOC > DON DOP, reflecting both differences maturity analytical methods greater focus on aquatic science community. shows that average concentration waters (average ± standard deviation (SD): 182±314 µmol C L−1; median: 103 L−1) is 13-fold higher than (13.6±30.4 N 8.0 L−1), which itself 39-fold (0.34±1.11 P 0.18 L−1). This dataset will be useful identifying spatial temporal patterns help facilitate reuse studies aimed better characterizing local processes; closing nutrient budgets; estimating carbon, nitrogen, phosphorous pools; establishing baseline modelling future changes
Language: Английский
Citations
6
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown
Published: Feb. 9, 2024
Marine dissolved organic matter (DOM) contains a complex mixture of small molecules that eludes rapid biological degradation. Spatial and temporal variations in the abundance DOM reflect existence fractions are removed from ocean over different time scales, ranging seconds to millennia. However, it remains unknown whether intrinsic chemical properties these components relate their persistence. Here, we elucidate compare molecular compositions distinct with lability along water column North Atlantic Gyre. Our analysis utilized ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry at 21 T coupled liquid chromatography novel data pipeline developed CoreMS generates formula assignments metrics isomeric complexity. Clustering binned 14 857 into groups correspond depth distribution semilabile, semirefractory, refractory DOM. The more labile were concentrated near surface contained aliphatic, hydrophobic, reduced than fraction, which occurred uniformly throughout column. These findings suggest processes selectively remove hydrophobic compounds, such as aggregation particle sorption, contribute variable removal rates marine
Language: Английский
Citations
5
Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 137 - 246
Published: Jan. 1, 2024
Language: Английский
Citations
4
Environmental Research, Journal Year: 2024, Volume and Issue: 261, P. 119708 - 119708
Published: July 30, 2024
Language: Английский
Citations
4
FEMS Microbiology Reviews, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 17, 2024
Abstract Microbial functional ecology is expanding as we can now measure the traits of wild microbes that affect ecosystem functioning. Here, review techniques and advances could be bedrock for a unified framework to study microbial functions. These include our newfound access environmental genomes, collections traits, but also ability microbes’ distribution expression. We then explore technical, ecological, evolutionary processes explain patterns diversity redundancy. Next, suggest reconciling microbiology with biodiversity-ecosystem-functioning studies by experimentally testing significance redundancy efficiency, resistance, resilience processes. Such will aid in identifying state shifts tipping points microbiomes, enhancing understanding how where microbiomes guide Earth's biomes context changing planet.
Language: Английский
Citations
4
Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)
Published: Jan. 22, 2025
Global oxygen minimum zones (OMZs) often reach hypoxia but seldom anoxia. Recently it was reported that Michaelis Menten constants (Km) of oxidative enzymes are orders magnitude higher than respiratory Km values, and in the Hypoxic Barrier Hypothesis proposed that, ecosystems experiencing falling oxygen, oxygenase enzyme activities become oxygen-limited long before respiration. We conducted a mesocosm experiment with phytoplankton bloom as an organic carbon source controlled dissolved (DO) concentrations dark to determine whether slows oxidation decline. Total utilization (TOU) hypoxic treatment (ca. 7.1 µM O2) 21.7% lower oxic 245.1 over first 43 days experiment. In addition, following restoration fully conditions treatment, TOU accelerated, demonstrating processes sensitive DO found large volumes ocean. Microbial amplicon-based community composition diverged between treatments, indicating specialized microbiome included Thioglobaceae (SUP05 Gammaproteobacteria), OM190 (Planctomycetota), ABY1 (Patescibacteria), SAR86 subclade D2472, thrived while genus Candidatus Actinomarina SAR11 alphaproteobacteria were sharply inhibited. Our findings support hypothesis kinetics might slow progression ocean deoxygenation oxygen-poor regions be factor evolution microbial taxa adapted environments.
Language: Английский
Citations
0
Springer oceanography, Journal Year: 2025, Volume and Issue: unknown, P. 277 - 287
Published: Jan. 1, 2025
Language: Английский
Citations
0
Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(4)
Published: April 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.
Language: Английский
Citations
0