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Annotated Southern Ocean diatom LM micrographs from POLARSTERN cruise PS79, 10 p - masked
No full textAnnotated Southern Ocean diatom LM micrographs from POLARSTERN cruise PS79, 100 p - unmasked
No full textReference concentrations of biochemical oxygen demand (BOD), faecal coliform bacteria (FC), and total dissolved solids (TDS) from published literature sources used for model validation
No full textThe attached table contains source information and measured concentrations of faecal coliform bacteria (FC), biochemical oxygen demand (BOD), and total dissolved solids (TDS). These measurements come from published literature and constitute supplementary information for the manuscript mentioned in the reference (in this context, the data was used for model validation and testing). This dataset was used for the project "The world's water quality: A pre-study for a worldwide assessment" for which funding was provided by the United Nations Environmental Programme (UNEP) and UN-Water
Benthic oxygen isotopic records of the spliced record of IODP Site 361-U1476 at the Davie Ridge, Mozambique Channel
No full textRecords of sortable silt (SS) percentages and means from the spliced record of IODP Site U1476 at the Davie Ridge, Mozambique Channel. The age model of this spliced record is based on benthic oxygen isotopes and biostratigraphy
Methane oxidation rate and constant k in the South China Sea
No full textThe South China Sea (SCS) frequently encounters mesoscale eddies due to the influence of the Kuroshio intrusion and monsoonal patterns. However, the impact of these eddies on methane (CH4) biogeochemical cycling in the SCS remains poorly understood. Dissolved methane and dimethylsulfoniopropionate (DMSP) samples were collected from the eddy pair (cyclonic-anticyclonic eddy pair) at stations ME1−ME7, located near the western side of Hainan Island, on September 27, 2020. Additionally, methane concentration and oxidation rates were assessed within anticyclonic eddy stations between September 13 and 23, 2022. The distribution of SLA were obtained from the Copernicus Marine Environment Monitoring Service at 0.25° resolution. Seawater samples collected by 12 L Niskin bottles equipped with SBE 911 plus a conductivity-temperature-depth (CTD) probe. The CH4 sample was collected in 120 mL brown bottles and then 50 μL saturated HgCl2 was added to inhibit biological activity. Samples were sealed with aluminum caps containing Teflon septa and temporarily stored in the dark at 4°C.Dissolved methane was measured using a cryogenic purge-and-trap setup connected to an gas chromatograph (GC-8890, Agilent, USA) with a flame ionization detector (FID) according to the detailed methods given in (Zhang et al., 2004, doi:10.1029/2004JC002268). The 3H radiotracer approach was used to measure the aerobic MOx rate (Bussmann et al. (2015, doi:10.5194/bg-14-4985-2017); Mao et al. (2022, doi:10.1038/s41467-022-35082-y); Liu et al. (2024, doi:10.1029/2023JC020280). Seawater samples (triplicate samples and one killed control) were filled into 20 ml Hungute tubes with butyl rubber stoppers without headspace. 50 μl ³H-CH⁴ gas was injected using airtight needles into each sample by displacing the same volume of seawater. Controls were killed with a final concentration of 3.7% formaldehyde prior to tracer additions. All samples were incubated in the dark at in situ sampled temperature for 48 hours. The concentration of CH⁴ added to the samples was less than ~2 nM. Once the incubation was finished, ~100 μl subsample was collected in 2 ml glass vials filled with scintillation liquid, which was used to measure total radioactivity (DPM-³H-H²O and DPM-³H-CH⁴) using a scintillation counter (Tri-Carb 3110TR, USA). The remaining sample was transferred to a 50 ml falcon tube containing 2 ml 37% formaldehyde and purged with N² for 45 min to remove the unused ³H-CH⁴. Then 2 ml samples added 5 ml scintillation liquid was quantified for the measurement of DPM-³H²O
Soild phase chemistry from site NB8 in the Ore Estuary (Bothnian Sea)
No full textPorewater depth profiles of ammonium, nitrate, sulfate, sulfide, dissolved iron, dissolved manganese, methane and oxygen; Solid phase depth profiles of total organic carbon, sequential iron and manganese extraction results of site NB8 in the Ore Estuary in the Bothnian Sea. (data published in doi:10.1021/acs.est.3c02023). Sedimentary Fe and Mn speciation was determined on ca. 50 mg from the anoxic fraction using a 5-step sequential extraction procedure