Dissolved Organic Matter

Álvarez‐Salgado, Xosé Antón; Nieto‐Cid, Mar; Rossel, Pamela E.

doi:10.1007/978-3-031-14486-8_2

Cited by 4 publications

(8 citation statements)

References 204 publications

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“…23 Higher concentrations of organic molecules are found in the sea surface microlayer, 24 and values of 70-80 mmol kg À1 and 100 mmol kg À1 have been recorded in subtropical gyres and ocean margins, respectively. 22 The presence of such dissolved substances in water can impact ice formation and adhesion by affecting the freezing temperature and the structural morphology of the resulting ice respectively. Previous studies focusing on salt's role in sea-ice formation have shown that depending upon the freezing rate, salt-rich solution (brine), may either be rejected or become trapped within the ice (homogeneously or as brine pockets).…”

Section: New Conceptsmentioning

confidence: 99%

“…21 Oceans have an average salinity level of 3.5% (or 35 000 ppm), consisting mainly of sodium and chloride ions, along with other ionic species such as magnesium, sulfate, calcium, potassium, and bicarbonate in smaller amounts. 22 Dissolved organics are also present in the ocean with an average concentration of 0.48 ppm, mainly in the form of fatty esters, free fatty acids, fatty alcohols, and surfactants (existing in the range from <0.033 to 0.52 μM). 23 Higher concentrations of organic molecules are found in the sea surface microlayer, 24 and values of 70–80 μmol kg −1 and 100 μmol kg −1 have been recorded in subtropical gyres and ocean margins, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…23 Higher concentrations of organic molecules are found in the sea surface microlayer, 24 and values of 70–80 μmol kg −1 and 100 μmol kg −1 have been recorded in subtropical gyres and ocean margins, respectively. 22…”

Section: Introductionmentioning

confidence: 99%

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Adhesion of impure ice on surfaces

Chatterjee,

Thanjukutty,

Carducci

et al. 2024

Mater. Horiz.

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Section: New Conceptsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adhesion of impure ice on surfaces

Chatterjee,

Thanjukutty,

Carducci

et al. 2024

Mater. Horiz.

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“…The bulk elemental, optical and isotopic characterization of DOM can be applied directly to natural seawater samples (Mopper et al, 2007;Hansell et al, 2009b;Stedmon and Nelson, 2015;A ́lvarez-Salgado et al, 2022). Conversely, other approaches, such as the molecular characterization of DOM by nuclear magnetic resonance spectroscopy, ultrahigh resolution mass spectrometry or pyrolysis-gas chromatography-mass spectrometry, require concentration and desalinization of the sample before analysis (Mopper et al, 2007;Raeke et al, 2016;Amaral et al, 2020;A ́lvarez-Salgado et al, 2022). Each DOM characterization analysis provides information on different analytical windows, which partially overlap.…”

Section: Introductionmentioning

confidence: 99%

“…Fluorescent DOM (FDOM) is the fraction of CDOM that is capable of emitting part of the absorbed light at longer wavelengths (Coble, 1996;Coble, 2007). FDOM intensity maxima are observed at excitation wavelengths < 400 nm, characteristic of protein-like substances and > 400 nm, characteristic of humic-like substances (Coble, 2007;Stedmon and Nelson, 2015;A ́lvarez-Salgado et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Solid phase extraction of ocean dissolved organic matter with PPL cartridges: efficiency and selectivity

et al. 2023

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Our current knowledge of the chemical composition of ocean dissolved organic matter (DOM) is limited, mainly because of its extreme molecular diversity, low concentration of individual compounds and the elevated ionic strength of ocean waters. As a result, many analytical methods require a previous extraction step. The efficiency and selectivity of the extraction method defines the representativeness of the extracted DOM fraction. Nowadays, the most widespread procedure for concentrating DOM is solid phase extraction (SPE) using styrene divinyl benzene polymer cartridges (PPL). Here, we investigate the effect of SPE-PPL on DOM elemental and optical properties to assess the efficiency and selectivity of this extraction method on water samples from the main intermediate and deep water masses of Arctic, Mediterranean and Antarctic origin present in the Cape Vert Frontal Zone (CVFZ, NW Africa). Furthermore, North and South Atlantic Central waters converge in this area and coastal DOM is injected by the giant upwelling filament of Cape Blanc. On one side, the colored fraction of DOM (CDOM) presented extraction efficiencies comparable to that of the bulk dissolved organic carbon (DOC), but decreased significantly with increasing wavelength, suggesting an affinity of PPL cartridges for low molecular weight organic compounds. While the protein-like fluorescent fraction of DOM (FDOM) was also extracted with the same efficiency than DOC, the extraction efficiency of the humic-like fraction was comparatively much higher. On the other side, dissolved organic nitrogen (DON) extraction efficiencies were about half that of DOC. These contrasting extraction efficiencies of the different DOM pools indicated that the extracts were enriched in N-poor, low molecular weight and recalcitrant DOM, therefore showing less variability than the corresponding bulk DOM. Furthermore, DOC, DON, CDOM and FDOM extracted were not homogeneous through the water column but displayed certain significant differences among water masses in both efficiency and selectivity.

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A global database of dissolved organic matter (DOM) concentration measurements in coastal waters (CoastDOM v1)

Lønborg,

Carreira,

Abril

et al. 2024

Earth Syst. Sci. Data

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Abstract. Measurements of dissolved organic carbon (DOC), nitrogen (DON), and phosphorus (DOP) concentrations are used to characterize the dissolved organic matter (DOM) pool and are important components of biogeochemical cycling in the coastal ocean. Here, we present the first edition of a global database (CoastDOM v1; available at https://doi.org/10.1594/PANGAEA.964012, Lønborg et al., 2023) compiling previously published and unpublished measurements of DOC, DON, and DOP in coastal waters. These data are complemented by hydrographic data such as temperature and salinity and, to the extent possible, other biogeochemical variables (e.g. chlorophyll a, inorganic nutrients) and the inorganic carbon system (e.g. dissolved inorganic carbon and total alkalinity). Overall, CoastDOM v1 includes observations of concentrations from all continents. However, most data were collected in the Northern Hemisphere, with a clear gap in DOM measurements from the Southern Hemisphere. The data included were collected from 1978 to 2022 and consist of 62 338 data points for DOC, 20 356 for DON, and 13 533 for DOP. The number of measurements decreases progressively in the sequence DOC > DON > DOP, reflecting both differences in the maturity of the analytical methods and the greater focus on carbon cycling by the aquatic science community. The global database shows that the average DOC concentration in coastal waters (average ± standard deviation (SD): 182±314 µmol C L−1; median: 103 µmol C L−1) is 13-fold higher than the average coastal DON concentration (13.6±30.4 µmol N L−1; median: 8.0 µmol N L−1), which is itself 39-fold higher than the average coastal DOP concentration (0.34±1.11 µmol P L−1; median: 0.18 µmol P L−1). This dataset will be useful for identifying global spatial and temporal patterns in DOM and will help facilitate the reuse of DOC, DON, and DOP data in studies aimed at better characterizing local biogeochemical processes; closing nutrient budgets; estimating carbon, nitrogen, and phosphorous pools; and establishing a baseline for modelling future changes in coastal waters.

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Dissolved Organic Matter

Cited by 4 publications

References 204 publications

Adhesion of impure ice on surfaces

Adhesion of impure ice on surfaces

Solid phase extraction of ocean dissolved organic matter with PPL cartridges: efficiency and selectivity

A global database of dissolved organic matter (DOM) concentration measurements in coastal waters (CoastDOM v1)

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