Hydrographic, nutrient, and molecular dissolved organic matter data including thermogenic compounds from the Indian Ocean during R/V SONNE cruise SO305/2 (2024) (E‐POLIO‐T; M2Argo‐T)
type: Dataset
creator: Tassiana S G Serafim
creator: Martin Kolbe
creator: Ralf D Prien
creator: Tabea N L Mairon
  type: Person
  family name: Mairon
  given name: Tabea N L
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Jenny Jeschek
  type: Person
  family name: Jeschek
  given name: Jenny
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Madleen Dierken
  type: Person
  family name: Dierken
  given name: Madleen
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Janika Reineccius
  type: Person
  family name: Reineccius
  given name: Janika
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Ute Fensky
  type: Person
  family name: Fensky
  given name: Ute
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Christin Fechtel
  type: Person
  family name: Fechtel
  given name: Christin
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Mareike Floth-Peterson
  type: Person
  family name: Floth-Peterson
  given name: Mareike
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Kendra Witt
  type: Person
  family name: Witt
  given name: Kendra
  affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde
creator: Olaf Dellwig
creator: Anne Köhler
creator: Helena Osterholz
creator: Joanna J Waniek
publisher: PANGAEA
  type: Organization
  disambiguating description: Data Publisher for Earth & Environmental Science
included in data catalog: PANGAEA
  type: DataCatalog
  disambiguating description: Data Publisher for Earth & Environmental Science
date published: 2026-01-27
additional type: dataset
description: Hydrographic, biogeochemical, and dissolved organic matter (DOM) molecular data were collected during the R/V SONNE expedition SO305/2 (16 July - 6 August 2024) along a transect from 5° N to 20° S in the Indian Ocean. Continuous surface measurements and CTD profiles provided calibrated temperature, salinity, and oxygen data across major water masses from the surface to deep layers. A total of 176 filtered seawater samples from surface transects and vertical profiles were analysed for inorganic nutrients (nitrate, nitrite, phosphate, silicate) using continuous flow analysis, and for dissolved organic carbon (DOC), total dissolved nitrogen (TDN) via high-temperature catalytic oxidation and dissolved organic nitrogen (DON). Polycyclic aromatic hydrocarbons (PAHs) and dissolved black carbon (DBC) were determined using solid-phase extraction and used as proxies for thermogenic organic matter. Ultrahigh-resolution molecular characterization of solid-phase extracted DOM was conducted using FT-ICR-MS (7 T, negative ESI), with molecular indices (e.g., AIMOD, IDEG, ITERR, IBIO and IPHOTO) calculated to assess compositional and source variability. The combined dataset provides a comprehensive view of hydrographic structure, nutrient dynamics, and the composition and dynamics of DOM pool and thermogenic DOM across contrasting Indian Ocean water masses.
abstract: Hydrographic, biogeochemical, and dissolved organic matter (DOM) molecular data were collected during the R/V SONNE expedition SO305/2 (16 July - 6 August 2024) along a transect from 5° N to 20° S in the Indian Ocean. Continuous surface measurements and CTD profiles provided calibrated temperature, salinity, and oxygen data across major water masses from the surface to deep layers. A total of 176 filtered seawater samples from surface transects and vertical profiles were analysed for inorganic nutrients (nitrate, nitrite, phosphate, silicate) using continuous flow analysis, and for dissolved organic carbon (DOC), total dissolved nitrogen (TDN) via high-temperature catalytic oxidation and dissolved organic nitrogen (DON). Polycyclic aromatic hydrocarbons (PAHs) and dissolved black carbon (DBC) were determined using solid-phase extraction and used as proxies for thermogenic organic matter. Ultrahigh-resolution molecular characterization of solid-phase extracted DOM was conducted using FT-ICR-MS (7 T, negative ESI), with molecular indices (e.g., AIMOD, IDEG, ITERR, IBIO and IPHOTO) calculated to assess compositional and source variability. The combined dataset provides a comprehensive view of hydrographic structure, nutrient dynamics, and the composition and dynamics of DOM pool and thermogenic DOM across contrasting Indian Ocean water masses.
citation: cr so305 2
citation: Disentangling Biological Transformations and Photodegradation Processes from Marine Dissolved Organic Matter Composition in the Global Ocean
citation: The molecular level determination of black carbon in marine dissolved organic matter
citation: A simple and efficient method for the solid-phase extraction of dissolved organic matter (SPE-DOM) from seawater
citation: A molecular perspective on the ageing of marine dissolved organic matter
citation: From mass to structure: an aromaticity index for high-resolution mass data of natural organic matter
citation: Molecular transformation and degradation of refractory dissolved organic matter in the Atlantic and Southern Ocean
citation: Spatial distribution, sources and ecological risk assessment of polycyclic aromatic hydrocarbons in surface seawater from Yangpu Bay, China
citation: A novel molecular approach for tracing terrigenous dissolved organic matter into the deep ocean
citation: Imprint of incomplete combustion processes on the water column of the anthropogenic-pressured Baltic Sea
citation: Photo-lability of deep ocean dissolved black carbon
spatial coverage: Place
  geo: GeoShape
    box: -18.828 60.371 4.175 91.653
temporal coverage: 2024-07-20T16:35:00/2024-08-02T13:43:00
funding: SO305/2 - E-POLIO: Neue Schadstoffe und Mikroplastik im Oberflächenwasser des Indischen Ozeans; Vorhaben: Mikroplastik, Schadstoffe & Koordination
  type: MonetaryGrant
  funder: Bundesministerium für Bildung und Forschung, Bonn
size: QuantitativeValue
  value: 7515.0
  unit text: data points
variable measured: Event label
variable measured: LATITUDE
variable measured: LONGITUDE
variable measured: DEPTH, water
  type: PropertyValue
  unit text: m
  subject of: DefinedTermSet
    has defined term: depth
    has defined term: water
    has defined term: Length
variable measured: DATE/TIME
  type: PropertyValue
  measurement technique: CTD, Sea-Bird, SBE 19
  subject of: DefinedTermSet
    has defined term: Time
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 19 SEACAT CTD
variable measured: Temperature, water
  type: PropertyValue
  unit text: °C
  measurement technique: CTD, Sea-Bird, SBE 911; equipped with temperature sensor, Sea-Bird, SBE3
  description: Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: Temperature
    has defined term: water
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 3S temperature sensor
    has defined term: Sea-Bird SBE 911 CTD
variable measured: Salinity
  type: PropertyValue
  measurement technique: CTD, Sea-Bird, SBE 911; equipped with conductivity sensor, Sea-Bird, SBE4
  description: Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: salinity
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 911 CTD
    has defined term: Sea-Bird SBE 4C conductivity sensor
variable measured: Oxygen, dissolved
  type: PropertyValue
  unit text: ml/l
  measurement technique: CTD, Sea-Bird, SBE 911; equipped with dissolved oxygen sensor, Sea-Bird, SBE43
  description: Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: oxygen
    has defined term: dissolved
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 43 Dissolved Oxygen Sensor
    has defined term: Sea-Bird SBE 911 CTD
variable measured: Oxygen
  type: PropertyValue
  unit text: µmol/kg
  measurement technique: CTD, Sea-Bird, SBE 911; equipped with dissolved oxygen sensor, Sea-Bird, SBE43
  description: Dissolved oxygen, Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: oxygen
    has defined term: Molar Concentration
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 43 Dissolved Oxygen Sensor
    has defined term: Sea-Bird SBE 911 CTD
variable measured: Density, sigma-theta (0)
  type: PropertyValue
  unit text: kg/m**3
  measurement technique: CTD, Sea-Bird, SBE 19
  subject of: DefinedTermSet
    has defined term: Density
    has defined term: CTD & XBT
    has defined term: Sea-Bird SBE 19 SEACAT CTD
variable measured: Chlorophyll a
  type: PropertyValue
  unit text: mg/m**3
  measurement technique: Spectrophotometric assay; from GF/F filters
  subject of: DefinedTermSet
    has defined term: chlorophyll a
    has defined term: Density
variable measured: Carbon, organic, dissolved
  type: PropertyValue
  unit text: µmol/l
  measurement technique: Total organic carbon analyzer, Shimadzu, TOC-L
  description: after acidification and filtration with pre-combusted GF/F filters [0.7 µm]; Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: carbon
    has defined term: organic
    has defined term: dissolved
    has defined term: Molar Concentration
    has defined term: Shimadzu TOC-L Total Organic Carbon Analyser series
variable measured: Carbon, organic, dissolved, solid phase extractable
  type: PropertyValue
  unit text: µmol/l
  measurement technique: Concentration using Bond Elut PPL solid‑phase extraction; followed by quantification from the dried methanol extract
  description: Dittmar et al., 2008
  subject of: DefinedTermSet
    has defined term: carbon
    has defined term: organic
    has defined term: dissolved
    has defined term: Molar Concentration
variable measured: Nitrogen, total dissolved
  type: PropertyValue
  unit text: µmol/l
  measurement technique: Total organic carbon analyzer, Shimadzu, TOC-L
  description: after acidification and filtration with pre-combusted GF/F filters [0.7 µm]
  subject of: DefinedTermSet
    has defined term: nitrogen
    has defined term: Molar Concentration
    has defined term: Shimadzu TOC-L Total Organic Carbon Analyser series
variable measured: Nitrogen, organic, dissolved
  type: PropertyValue
  unit text: µmol/l
  measurement technique: Calculated
  description: Calculated as the difference between TDN and NO23
  subject of: DefinedTermSet
    has defined term: nitrogen
    has defined term: organic
    has defined term: dissolved
    has defined term: Molar Concentration
variable measured: Nitrate and Nitrite
  type: PropertyValue
  unit text: µmol/l
  measurement technique: Measured photometrically with a Continuous Flow Analyzer (CFA)
  description: Combined nitrite and nitrate (NO23), Waniek et al., 2024
  subject of: DefinedTermSet
    has defined term: nitrate
    has defined term: nitrite
    has defined term: Molar Concentration
variable measured: Phosphate
variable measured: Silicate
variable measured: Suspended particulate matter
variable measured: Carbon, organic, particulate
variable measured: Naphthalene
variable measured: Acenaphthylene
variable measured: Acenaphthene
variable measured: Fluorene
variable measured: Phenanthrene
variable measured: Anthracene
variable measured: Fluoranthene
variable measured: Pyrene
variable measured: Benzo(a)anthracene
variable measured: Chrysene
variable measured: Benzo(b)fluoranthene
variable measured: Benzo(k)fluoranthene
variable measured: Benzo(a)pyrene
variable measured: Indeno(1,2,3-cd)pyrene
variable measured: Dibenzo(a,h)anthracene
variable measured: Benzo(g,h,i)perylene
variable measured: Polycyclic aromatic hydrocarbons
variable measured: Black carbon, dissolved
keywords: Dissolved Black Carbon; Dissolved Organic Matter; DOM; Indian Ocean; Polycyclic aromatic hydrocarbons
license: https://creativecommons.org/licenses/by/4.0/
conditions of access: access rights needed
is accessible for free: false
language: en

Tassiana S G Serafim
type: Person
family name: Serafim
given name: Tassiana S G
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Leibniz Institute for Baltic Sea Research, Warnemünde
type: Organization
alternate name: IOW

Martin Kolbe
type: Person
family name: Kolbe
given name: Martin
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Ralf D Prien
type: Person
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given name: Ralf D
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Olaf Dellwig
type: Person
family name: Dellwig
given name: Olaf
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Anne Köhler
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given name: Anne
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Helena Osterholz
type: Person
family name: Osterholz
given name: Helena
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

Joanna J Waniek
type: Person
family name: Waniek
given name: Joanna J
affiliation: Leibniz Institute for Baltic Sea Research, Warnemünde

cr so305 2
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creator: Tassiana S G Serafim
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creator: Kendra Witt
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creator: Olaf Dellwig
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creator: Martin Kolbe
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name: Emerging Pollutants and Microplastic Abundance in Surface Waters of Indian Ocean, High-resolution seafloor Mapping and Magnetic field characterization of the Argo transform fault at the Central Indian Ridge, Cruise No. SO305/2, 16.07.2024-05.08.2024, Singapore (Singapore) - Port Louis (Mauritius)
date published: 2024
pagination: 33 pp
is part of: SONNE-Berichte, Begutachtungspanel Forschungsschiffe
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Disentangling Biological Transformations and Photodegradation Processes from Marine Dissolved Organic Matter Composition in the Global Ocean
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The molecular level determination of black carbon in marine dissolved organic matter
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A simple and efficient method for the solid-phase extraction of dissolved organic matter (SPE-DOM) from seawater
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A molecular perspective on the ageing of marine dissolved organic matter
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From mass to structure: an aromaticity index for high-resolution mass data of natural organic matter
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Molecular transformation and degradation of refractory dissolved organic matter in the Atlantic and Southern Ocean
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Spatial distribution, sources and ecological risk assessment of polycyclic aromatic hydrocarbons in surface seawater from Yangpu Bay, China
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A novel molecular approach for tracing terrigenous dissolved organic matter into the deep ocean
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Imprint of incomplete combustion processes on the water column of the anthropogenic-pressured Baltic Sea
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Photo-lability of deep ocean dissolved black carbon
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Bundesministerium für Bildung und Forschung, Bonn
type: Organization
alternate name: BMBF

depth
type: DefinedTerm

water
type: DefinedTerm

Length
type: DefinedTerm
alternate name: L

Time
type: DefinedTerm
alternate name: T

Sea-Bird SBE 19 SEACAT CTD
type: DefinedTerm

Temperature
type: DefinedTerm
alternate name: Θ

Sea-Bird SBE 3S temperature sensor
type: DefinedTerm

Sea-Bird SBE 911 CTD
type: DefinedTerm

salinity
type: DefinedTerm

Sea-Bird SBE 4C conductivity sensor
type: DefinedTerm

oxygen
type: DefinedTerm
alternate name: O

dissolved
type: DefinedTerm

Sea-Bird SBE 43 Dissolved Oxygen Sensor
type: DefinedTerm

Density
type: DefinedTerm

chlorophyll a
type: DefinedTerm

carbon
type: DefinedTerm
alternate name: C

Shimadzu TOC-L Total Organic Carbon Analyser series
type: DefinedTerm

nitrogen
type: DefinedTerm
alternate name: N

nitrate
type: DefinedTerm

nitrite
type: DefinedTerm

phosphate
type: DefinedTerm

naphthalene
type: DefinedTerm

acenaphthylene
type: DefinedTerm

acenaphthene
type: DefinedTerm

fluorene
type: DefinedTerm

phenanthrene
type: DefinedTerm

anthracene
type: DefinedTerm

fluoranthene
type: DefinedTerm

Pyrene
type: DefinedTerm

benzo[a]anthracene
type: DefinedTerm

chrysene
type: DefinedTerm

benzo[b]fluoranthene
type: DefinedTerm

Benzo[k]fluoranthene
type: DefinedTerm

benzo[a]pyrene
type: DefinedTerm

Indeno[1,2,3-cd]pyrene
type: DefinedTerm

ratio
type: DefinedTerm

Dimensionless Ratio
type: DefinedTerm
alternate name: ψ

fourier transform infrared spectroscopy
type: DefinedTerm

island
type: DefinedTerm

stability
type: DefinedTerm

Phosphate
type: PropertyValue
unit text: µmol/l
measurement technique: Measured photometrically with a Continuous Flow Analyzer (CFA); following accredited protocols [D-PL-14544-01-00]
description: Waniek et al., 2024
subject of: DefinedTermSet
  has defined term: phosphate
  has defined term: Molar Concentration

Silicate
type: PropertyValue
unit text: µmol/l
measurement technique: Measured photometrically with a Continuous Flow Analyzer (CFA)
description: Waniek et al., 2024
subject of: DefinedTermSet
  has defined term: Molar Concentration

Suspended particulate matter
type: PropertyValue
unit text: mg/l
measurement technique: Gravimetric analysis (GF/F filtered)
description: representing particulate load in the water column
subject of: DefinedTermSet
  has defined term: suspended matter
  has defined term: Density

Carbon, organic, particulate
type: PropertyValue
unit text: µmol/l
measurement technique: Total organic carbon analyzer, Shimadzu, TOC-L
description: pre-combusted GF/F filters [0.7 µm]; Waniek et al., 2024
subject of: DefinedTermSet
  has defined term: carbon
  has defined term: organic
  has defined term: particulate
  has defined term: Molar Concentration
  has defined term: Shimadzu TOC-L Total Organic Carbon Analyser series

Naphthalene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: naphthalene
  has defined term: Density

Acenaphthylene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: acenaphthylene
  has defined term: Density

Acenaphthene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: acenaphthene
  has defined term: Density

Fluorene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: fluorene
  has defined term: Density

Phenanthrene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: phenanthrene
  has defined term: Density

Anthracene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: anthracene
  has defined term: Density

Fluoranthene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: fluoranthene
  has defined term: Density

Pyrene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: Pyrene
  has defined term: Density

Benzo(a)anthracene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: benzo[a]anthracene
  has defined term: Density

Chrysene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: chrysene
  has defined term: Density

Benzo(b)fluoranthene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: benzo[b]fluoranthene
  has defined term: Density

Benzo(k)fluoranthene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: Benzo[k]fluoranthene
  has defined term: Density

Benzo(a)pyrene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: benzo[a]pyrene
  has defined term: Density

Indeno(1,2,3-cd)pyrene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: Indeno[1,2,3-cd]pyrene
  has defined term: Density

Dibenzo(a,h)anthracene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: dibenzo[a,h]anthracene
  has defined term: Density

Benzo(g,h,i)perylene
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: Density

Polycyclic aromatic hydrocarbons
type: PropertyValue
unit text: ng/l
measurement technique: Solid‑phase extraction (SPE), Merck, ENVI‑18 (C18) SPE cartridges; followed by Gas Chromatography-Mass Spectrometry (GC-MS), Agilent, Intuvo 9000 coupled with 5977 MSD
description: Li et al., 2015
subject of: DefinedTermSet
  has defined term: Density

Black carbon, dissolved
type: PropertyValue
unit text: µmol/l
measurement technique: Calculated from dissolved black carbon
description: Calculated from mellitic and pentacarboxylic acids determined via Waters Acquity UPLC system with photodiode array detection (Dittmar et al., 2008; Stubbins et al., 2012)
subject of: DefinedTermSet
  has defined term: black carbon
  has defined term: dissolved
  has defined term: Molar Concentration

Mellitic/pentacarboxylic ratio
type: PropertyValue
measurement technique: Liquid chromatography and diode-array detection (Waters Acquity UPLC)
description: Dittmar, 2008
subject of: DefinedTermSet
  has defined term: ratio

Carbon, organic, dissolved/black carbon, dissolved ratio
type: PropertyValue
unit text: %
measurement technique: Calculated
description: Calculated from Dissolved Black Carbon and Dissolved Organic Carbon
subject of: DefinedTermSet
  has defined term: carbon
  has defined term: organic
  has defined term: dissolved
  has defined term: black carbon
  has defined term: ratio
  has defined term: Dimensionless Ratio

Mass-to-charge ratio
type: PropertyValue
measurement technique: Weighted average
description: Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS) (Serafim et al., 2025)
subject of: DefinedTermSet
  has defined term: ratio

Hydrogen/Carbon ratio
type: PropertyValue
measurement technique: Weighted average
description: Elemental ratio derived from FT-ICR-MS data (Serafim et al., 2025)
subject of: DefinedTermSet
  has defined term: hydrogen
  has defined term: carbon
  has defined term: ratio

Oxygen/Carbon ratio
type: PropertyValue
measurement technique: Weighted average
description: Elemental ratio derived from FT-ICR-MS data (Serafim et al., 2025)
subject of: DefinedTermSet
  has defined term: oxygen
  has defined term: carbon
  has defined term: ratio

Aromaticity index, modified
type: PropertyValue
measurement technique: Weighted average
description: Degree of aromaticity from molecular formulae derived from FT-ICR-MS data (Koch & Dittmar, 2006)

Double bond equivalent
type: PropertyValue
measurement technique: Weighted average
description: Number of rings plus double bonds, derived from FT-ICR-MS data

Nitrogen-bearing compounds
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Relative abundance of nitrogen containing compounds derived from FT-ICR-MS data (Serafim et al., 2025)
subject of: DefinedTermSet
  has defined term: fourier transform infrared spectroscopy

Sulfur-bearing compounds
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Relative abundance of sulfur containing compounds derived from FT-ICR-MS data (Serafim et al., 2025)
subject of: DefinedTermSet
  has defined term: fourier transform infrared spectroscopy

Degradation index
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Molecular index reflecting the degree of oxidative alteration or microbial processing of DOM (Flerus et al., 2012)
subject of: DefinedTermSet
  has defined term: fourier transform infrared spectroscopy

Island of stability
type: PropertyValue
unit text: %
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Relative contribution of persistent molecular formulas resistant to degradation, derived from FT-ICR-MS data (Lechtenfeld et al., 2014)
subject of: DefinedTermSet
  has defined term: island
  has defined term: stability
  has defined term: Dimensionless Ratio
  has defined term: fourier transform infrared spectroscopy

Index of terrigenous influence
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Indicator of terrestrial Dissolved Organic Matter input, derived from FT-ICR-MS data (Medeiros et al., 2016)
subject of: DefinedTermSet
  has defined term: index
  has defined term: fourier transform infrared spectroscopy

Index of biological formation and transformation
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Molecular index reflecting biotransformation and formation, derived from FT-ICR-MS data (Bercovici et al., 2023)
subject of: DefinedTermSet
  has defined term: index
  has defined term: fourier transform infrared spectroscopy

Index of photodegradation
type: PropertyValue
measurement technique: Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
description: Molecular index reflecting photodegradation, derived from FT-ICR-MS data (Bercovici et al., 2023)
subject of: DefinedTermSet
  has defined term: index
  has defined term: fourier transform infrared spectroscopy

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