Leibniz Institute for Baltic Sea Research, Warnemünde
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)
Data Publisher for Earth & Environmental Science
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.
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)
SONNE-Berichte, Begutachtungspanel Forschungsschiffe
Disentangling Biological Transformations and Photodegradation Processes from Marine Dissolved Organic Matter Composition in the Global Ocean
The molecular level determination of black carbon in marine dissolved organic matter
A simple and efficient method for the solid-phase extraction of dissolved organic matter (SPE-DOM) from seawater
A molecular perspective on the ageing of marine dissolved organic matter
From mass to structure: an aromaticity index for high-resolution mass data of natural organic matter
Rapid Communications in Mass Spectrometry
Molecular transformation and degradation of refractory dissolved organic matter in the Atlantic and Southern Ocean
Spatial distribution, sources and ecological risk assessment of polycyclic aromatic hydrocarbons in surface seawater from Yangpu Bay, China
A novel molecular approach for tracing terrigenous dissolved organic matter into the deep ocean
Imprint of incomplete combustion processes on the water column of the anthropogenic-pressured Baltic Sea
Photo-lability of deep ocean dissolved black carbon
SO305/2 - E-POLIO: Neue Schadstoffe und Mikroplastik im Oberflächenwasser des Indischen Ozeans; Vorhaben: Mikroplastik, Schadstoffe & Koordination
Bundesministerium für Bildung und Forschung, Bonn
CTD, Sea-Bird, SBE 911; equipped with temperature sensor, Sea-Bird, SBE3
CTD, Sea-Bird, SBE 911; equipped with conductivity sensor, Sea-Bird, SBE4
CTD, Sea-Bird, SBE 911; equipped with dissolved oxygen sensor, Sea-Bird, SBE43
Spectrophotometric assay; from GF/F filters
Total organic carbon analyzer, Shimadzu, TOC-L
after acidification and filtration with pre-combusted GF/F filters [0.7 µm]; Waniek et al., 2024
Shimadzu TOC-L Total Organic Carbon Analyser series
Carbon, organic, dissolved, solid phase extractable
Concentration using Bond Elut PPL solid‑phase extraction; followed by quantification from the dried methanol extract
after acidification and filtration with pre-combusted GF/F filters [0.7 µm]
Calculated as the difference between TDN and NO23
Measured photometrically with a Continuous Flow Analyzer (CFA)
Combined nitrite and nitrate (NO23), Waniek et al., 2024
Measured photometrically with a Continuous Flow Analyzer (CFA); following accredited protocols [D-PL-14544-01-00]
representing particulate load in the water column
pre-combusted GF/F filters [0.7 µm]; Waniek et al., 2024
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
Calculated from mellitic and pentacarboxylic acids determined via Waters Acquity UPLC system with photodiode array detection (Dittmar et al., 2008; Stubbins et al., 2012)
Liquid chromatography and diode-array detection (Waters Acquity UPLC)
Carbon, organic, dissolved/black carbon, dissolved ratio
Calculated from Dissolved Black Carbon and Dissolved Organic Carbon
Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS) (Serafim et al., 2025)
Elemental ratio derived from FT-ICR-MS data (Serafim et al., 2025)
Degree of aromaticity from molecular formulae derived from FT-ICR-MS data (Koch & Dittmar, 2006)
Number of rings plus double bonds, derived from FT-ICR-MS data
Derived from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
Relative abundance of nitrogen containing compounds derived from FT-ICR-MS data (Serafim et al., 2025)
Relative abundance of sulfur containing compounds derived from FT-ICR-MS data (Serafim et al., 2025)
Molecular index reflecting the degree of oxidative alteration or microbial processing of DOM (Flerus et al., 2012)
Relative contribution of persistent molecular formulas resistant to degradation, derived from FT-ICR-MS data (Lechtenfeld et al., 2014)
Indicator of terrestrial Dissolved Organic Matter input, derived from FT-ICR-MS data (Medeiros et al., 2016)
Index of biological formation and transformation
Molecular index reflecting biotransformation and formation, derived from FT-ICR-MS data (Bercovici et al., 2023)
Molecular index reflecting photodegradation, derived from FT-ICR-MS data (Bercovici et al., 2023)
Dissolved Black Carbon; Dissolved Organic Matter; DOM; Indian Ocean; Polycyclic aromatic hydrocarbons