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Master tracks in different resolutions from POLAR 6 flight P6-253_Polarmonitor_2024_2408210502
No full textMaster tracks in different resolutions from POLAR 6 flight P6-253_Polarmonitor_2024_2408220601
No full textAge model control points for the Marine Isotope Stage (MIS) 18 to MIS 28 interval of IODP Site 339-U1387, Gulf of Cadiz
No full textRadiosonde measurements during POLARSTERN cruise PS130/2
No full textThe meteorological observatory Polarstern continuously performs radiosoundings during times of ship operation. Typically, there is one launch to full altitude at 12 UTC every day. Additionally, there often is a launch with a smaller balloon for forecasting purposes (helicopter operations) around 6 UTC. All data reports are distributed via global networks of the World Meteorological Organisation. All data published here is generally as recorded. Data affected by known technical issues are not contained in this record
Marine carbon burial enhanced by microbial carbonate formation at hydrocarbon seeps
No full textSome of the carbon removed from Earth's surface is stored within authigenic carbonate in marine sediments. Methane seeps are crucial sites of global marine carbon cycling sustaining microbial activity, enabling carbonate formation and the transfer of methane-derived carbon to the geosphere. Carbon sequestration rates depend on carbonate precipitation rate, which can be accelerated by mat-forming microorganisms that are ubiquitous at methane seeps and other Earth surface environments today. We investigate a 5-m-long drill core from an active methane seep at 1500 m water depth in the South China Sea with an exceptional abundance of pink and clear aragonite cement derived from the sulphate-driven anaerobic oxidation of methane, yet both cements precipitated under different conditions. Phase-specific 230Th/U-based ages, lipid biomarker compositions, and calcium isotope data suggest that pink aragonite is a product of in situ biofilm mineralization. First estimated precipitation rates of these individual cements in the seep carbonates range from 0.04 cm/ka for clear aragonite to 1.0 cm/ka for pink aragonite, suggesting an up to 25-fold increase in precipitation rates associated with biofilm mineralization. These results provide first kinetic constraints for future quantitative carbon cycle models, emphasizing the role of biofilms in accelerating carbon sequestration in marine authigenic carbonates
Planktonic foraminifera faunal data and sea-surface temperatures for the Marine Isotope Stage (MIS) 18 to MIS 28 interval of IODP Site 339-U1387, Gulf of Cadiz
No full textIn this study we focus on IODP Site U1387 on the southern Portuguese margin to reconstruct surface water circulation and related plankton foraminifera ecosystem changes during the interval of Marine Isotope Stage (MIS) 28 to MIS 18 (1006-750 ka). Our planktonic foraminifera assemblages and SST reconstructions (foraminifera assemblages and UK'37 alkenone index) demonstrate warm, stable SST conditions during much of the interval due to persistent influence of subtropical gyre waters as indicated by the tropical-subtropical and Azores Current related foraminifera species and the periods with dominant sinistral coiling direction of the species Globorotalia truncatulinoides. Maximum interglacial SSTs were up to 2ºC warmer than at present in both summer and winter, with the exception of interglacial MIS 23 with SSTs ~1.5°C colder than in the other interglacials. The relative warm conditions were periodically interrupted by millennial-scale extreme cold events when polar species Neogloboquadrina pachyderma became abundant (>30%) and the SSTs, reconstructed from the foraminifera assemblage data, dropped below 10°C in summer and 5 °C in winter
Menthol-DCMU bleaching experiments on two foraminifera species, Amphistegina lobifera and Sorites orbiculus
No full textThis dataset documents experiments conducted on two foraminifera species, Amphistegina lobifera and Sorites orbiculus. Samples of Sorites orbiculus were collected from Eilat, Israel, and Amphistegina lobifera from the Mediterranean Sea, Sicily. Experiments were conducted from October to December 2019 at University of Victoria, Wellington in New Zealand. The aim of these experiments was to establish a rapid bleaching methodology to produce aposymbiotic hosts without compromising survivorship. Three independent experiments were carried out. The Menthol Concentration Comparison (MCC) experiment tested menthol concentrations (0.05 - 0.25 mmol L⁻¹) to determine an effective non-lethal dose for both species. The Bleaching Ecophysiology Assessment (BEA) used a single concentration (0.19 mmol L⁻¹) to evaluate growth, motility, and mortality with larger sample sizes. The 33-day High Concentration Trial (HCT) assessed motility under higher menthol concentrations at incremental steps (0.35, 0.4, 0.45, 0.50, 0.55, and 0.6 mmol L⁻¹). Data were collected using epifluorescence microscopy, growth assessments, survivorship assessments using photographs and pseudopodial movement, and motility analysis. The results provide a robust methodology for rapidly rearing aposymbiotic foraminifera, ensuring methodological reproducibility and minimizing lethality
Sediment echosounder raw data (Atlas Parasound P70 echosounder entire dataset) of RV POLARSTERN during cruise PS130/2
No full textSediment echosounder (Teledyne Parasound P70 echosounder) data are generally retrieved to get information on the characteristics of the upper tens of meters of the sub-seafloor. Raw primary high frequency (PHF) and secondary low frequency (SLF) echo sounding data were retrieved during POLARSTERN cruise PS130/2 (POLMAR-TRAIN) and are archived here in ASD and PS3 format. Data were collected as part of the POLMAR-TRAIN floating university program. The entire dataset of cruise PS130/2 is archived here, with data collected between Las Palmas and Bremerhaven
Multibeam bathymetry raw data (Kongsberg EM 122 entire dataset) of RV SONNE during cruise SO305/2
No full textRaw multibeam bathymetry data were collected aboard RV SONNE during cruise SO305/2 (E‐POLIO‐T M2Argo‐T) using a 12kHz Kongsberg EM 122 multibeam echosounder. The expedition took place during 2024-07-16 - 2024-08-05 from Singapore (Singapore) to Port Louis (Mauritius) in the Indian Ocean. The aim of SO305/2 EPOLIO was to determine the basin wide distribution of micropollutants and first evaluation of basin wide pollution state of the surface waters and water masses in the Indian Ocean. The aim of SO305/2 M2Argo-T was to obtain high-resolution seafloor Mapping and Magnetic field characterisation of the Argo transform fault at the Central Indian Ridge.
Data were recorded in the EEZ of Mauritius and outside. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by Leibniz Institute for Baltic Sea Research, Warnemünde and GEOMAR Helmholtz Centre for Ocean Research, provision of the data is supported by the DAM Underway Project and published according to the FAIR principles
Sediment echosounder raw data (Atlas Parasound P70 echosounder entire dataset) of RV POLARSTERN during cruise PS138
No full textThe Sediment Echo Sounder surveys the upper layers of the seafloor via the reflection of acoustic signals. Depending upon the reflectivity of the sediments penetration depths of about 200 m can be reached. The Parasound P70 (Teledyne RESON, previously ATLAS) was in operation 24 hours per day in the main working areas during Polarstern expedition PS138, covering parts of the Nansen Basin, Amundsen Basin and the Gakkel Ridge. Raw primary high frequency (PHF) and secondary low frequency (SLF) echo sounding data were retrieved during POLARSTERN cruise PS138 (ArcWatch-1) and are archived here in ASD and PS3 format