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PANGAEA - Publishing Network for Geoscientific & Environmental Data (840.077 recursos)

The information system PANGAEA is operated as an Open Access library aimed at archiving, publishing and distributing georeferenced data from earth system research. The system guarantees long-term availability of its content through a commitment of the operating institutions.

PANGAEA tech-keyword 'supplement' (10352 data sets)

Mostrando recursos 1 - 20 de 27.281

  1. Coral health assessment and in-situ water temperatures at various sites along Western Australia in 2015-2016

    Le Nohaïc, Morane; Ross, Claire L; Cornwall, Christopher E; Comeau, Steeve; Lowe, Ryan; McCulloch, Malcolm
    In 2015/16, a marine heatwave associated with a record El Niño led to the third global mass bleaching event documented to date. This event impacted coral reefs around the world, including in Western Australia (WA), although WA reefs had largely escaped bleaching during previous strong El Niño years. Coral health surveys were conducted during the austral summer of 2016 in four bioregions along the WA coast (~17 degrees of latitude), ranging from tropical to temperate locations. Here we report the first El Niño-related regional-scale mass bleaching event in WA. The heatwave primarily affected the macrotidal Kimberley region in northwest WA...

  2. Laboratory experiments for investigating permeability of gas hydrate bearing sands

    Kossel, Elke
    Experiments were performed with a 12 mm long and 1.2 mm diameter sapphire tube at pressures above 12 MPa and temperatures of 5°C. The tube was filled with sand (mean grain size 0.29 mm, maximum grain size 0.7 mm, minimum grain size 0.063 mm and modal grain size distribution). Distilled water, which was saturated with methane, was pumped through the sand at a constant flow rate of 0.75 ml/min. Gas hydrates eventually formed from the gas saturated solution.

  3. Biochemical characterization of vent fluids and the microbial community

    Meier, Dimitri V; Bach, Wolfgang; Girguis, Peter R; Gruber-Vodicka, Harald R; Reeves, Eoghan P; Richter, Michael; Vidoudez, Charles; Amann, Rudolf; Meyerdierks, Anke
    In this study, microbial communities in hydrothermal fluids from four different venting areas (White Flames, Cage Site, Woody and Babylon) within the Menez Gwen hydrothermal field (Mid-Atlantic Ridge) were analyzed. Samples were taken along mixing gradients, including diffuse fluid discharge points, their immediate surroundings, and the buoyant parts of hydrothermal plumes, selected based on visible venting, temperature readings and gas concentrations as indicated by in situ mass spectrometry (ISMS) spectra. High throughput 16S rRNA gene amplicon sequences obtained by Illumina paired-end sequencing using the primer combination Bakt_341F and Bakt_805R were analyzed. Total cell counts were determined and fluorescence in situ...

  4. Hydrogen isotope fractions of long-chain alkenones produced by Emiliania huxleyi during experiments

    Weiss, Gabriella M; Pfannerstill, Eva Y; Schouten, Stefan; Sinninghe Damsté, Jaap S; van der Meer, Marcel T J
    Over the last decade, hydrogen isotopes of long-chain alkenones have been shown to be a promising proxy for reconstructing paleo sea surface salinity due to a strong hydrogen isotope fractionation response to salinity across different environmental conditions. However, to date, the decoupling of the effects of alkalinity and salinity, parameters that co-vary in the surface ocean, on hydrogen isotope fractionation of alkenones has not been assessed. Furthermore, as the alkenone-producing haptophyte, Emiliania huxleyi, is known to grow in large blooms under high light intensities, the effect of salinity on hydrogen isotope fractionation under these high irradiances is important to constrain...

  5. Environmental parameters of deep-sea hydrothermal vents from the Manus Basin

    Meier, Dimitri V; Pjevac, Petra; Bach, Wolfgang; Hourdez, Stéphane; Girguis, Peter R; Vidoudez, Charles; Amann, Rudolf; Meyerdierks, Anke
    Thirtythree diffuse fluid and water column samples and 23 samples from surfaces of chimneys, rocks and fauna were subjected to a combined analyses of 16S RNA gene sequences, metagenomes and real-time in situ measured geochemical parameters to study distribution and niche-partitioning of sulfur-oxidizing bacteria (SOB) in deep-sea hydrothermal environments of the Manus Basin, a back-arc fast-spreading center located between New Britain and New Ireland in the Bismarck Sea. High throughput 16S rRNA gene amplicon sequences obtained by Illumina paired-end sequencing using the primer combination Bakt_341F and Bakt_805R for all samples were analyzed as well as full-length 16S rRNA genes using...

  6. Environmental parameters of deep-sea hydrothermal vents from the Manus Basin

    Meier, Dimitri V; Pjevac, Petra; Bach, Wolfgang; Hourdez, Stéphane; Girguis, Peter R; Vidoudez, Charles; Amann, Rudolf; Meyerdierks, Anke
    Thirtythree diffuse fluid and water column samples and 23 samples from surfaces of chimneys, rocks and fauna were subjected to a combined analyses of 16S RNA gene sequences, metagenomes and real-time in situ measured geochemical parameters to study distribution and niche-partitioning of sulfur-oxidizing bacteria (SOB) in deep-sea hydrothermal environments of the Manus Basin, a back-arc fast-spreading center located between New Britain and New Ireland in the Bismarck Sea. High throughput 16S rRNA gene amplicon sequences obtained by Illumina paired-end sequencing using the primer combination Bakt_341F and Bakt_805R for all samples were analyzed as well as full-length 16S rRNA genes using...

  7. Cloud optical thickness, cloud particle effective radius, and effective snow grain size retrieved from airborne spectral reflectivity measurements during VERDI 2012 over the Beaufort Sea

    Ehrlich, André; Bierwirth, Eike; Istomina, Larysa; Wendisch, Manfred
    The data contain time series of cloud optical thickness, cloud particle effective radius, and effective snow grain size retrieved from airborne spectral reflectivity measurements during the Vertical Distribution of Ice in Arctic Clouds (VERDI) campaign 2012 over the Beaufort Sea. Along the flight track of the Polar 5 aircraft operated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), the cloud and snow properties were derived simultaneously by applying a trispectral retrieval algorithm using reflectivity ratios as described by Ehrlich et al. (2017). Corresponding spectral nadir reflectivities measured by the spectral modular airborne radiation measurement system...

  8. Cloud optical thickness, cloud particle effective radius, and effective snow grain size retrieved from airborne spectral reflectivity measurements during VERDI 2012 over the Beaufort Sea

    Ehrlich, André; Bierwirth, Eike; Istomina, Larysa; Wendisch, Manfred
    The data contain time series of cloud optical thickness, cloud particle effective radius, and effective snow grain size retrieved from airborne spectral reflectivity measurements during the Vertical Distribution of Ice in Arctic Clouds (VERDI) campaign 2012 over the Beaufort Sea. Along the flight track of the Polar 5 aircraft operated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), the cloud and snow properties were derived simultaneously by applying a trispectral retrieval algorithm using reflectivity ratios as described by Ehrlich et al. (2017). Corresponding spectral nadir reflectivities measured by the spectral modular airborne radiation measurement system...

  9. Ice rafted debris of ODP Holes 104-642B and 104-644A in the Vøring Plateau

    Jansen, Eystein; Sjøholm, J; Bleil, Ulrich; Erichsen, JA

  10. Neodymium isotope, stable isotope and radiocarbon data from ODP Site 154-929

    Howe, Jacob N W; Piotrowski, Alexander M
    Authigenic neodymium isotopes, benthic foraminiferal stable isotopes and radiocarbon dates from ODP 929 in the deep equatorial western Atlantic Ocean.

  11. Plant macrofossil records from permafrost deposits of the Bol'shoy Lyakhovsky Island (New Siberian Archipelago)

    Kienast, Frank; Schirrmeister, Lutz
    To evaluate the consequences of possible future climate changes and to identify the main climate drivers in high latitudes, the vegetation and climate in the East Siberian Arctic during the last interglacial are reconstructed and compared with Holocene conditions. Plant macrofossils from permafrost deposits on Bol'shoy Lyakhovsky Island, New Siberian Archipelago, in the Russian Arctic revealed the existence of a shrubland dominated by Duschekia fruticosa, Betula nana and Ledum palustre and interspersed with lakes and grasslands during the last interglacial. The reconstructed vegetation differs fundamentally from the high arctic tundra that exists in this region today, but resembles an open...

  12. Porewater geochemistry of two shallow-water hydrothermal vents off Dominica Island (Lesser Antilles)

    Pop Ristova, Petra; Pichler, Thomas; Friedrich, Michael; Bühring, Solveig I
    in preparation

  13. Porewater geochemistry of two shallow-water hydrothermal vents off Dominica Island (Lesser Antilles)

    Pop Ristova, Petra; Pichler, Thomas; Friedrich, Michael; Bühring, Solveig I
    in preparation

  14. Porewater geochemistry of two shallow-water hydrothermal vents off Dominica Island (Lesser Antilles)

    Pop Ristova, Petra; Pichler, Thomas; Friedrich, Michael; Bühring, Solveig I
    in preparation

  15. Parental investment during mouth brooding in cichlids: adult cellular immune paramenter (flow cytometry), adult & juvenile candidate gene expression (Fluidigm)

    Keller, Isabel Salome; Salzburger, Walter; Roth, Olivia
    Background: Parental care, while increasing parental fitness through offspring survival also bears cost to the care-giving parent. Consequentially, trade offs between parental care and other vitally important traits, such as the immune system seem evident. In co-occurring phases of parental care and immunological challenges negative consequences through a resource allocation trade off on both the parental and the offspring conditions can be predicted. While the immune system is reflecting parental stress conditions, parental immunological investments also boost offspring survival via the transfer of immunological substances (trans-generational immune priming). We investigated this relationship adult and juvenile mouth brooding East African cichlid Astotatilapia...

  16. Perfluoroalkyl Substances (PFASs) in the North Sea, its tributaries and the Xiaoqing River in China

    Heydebreck, Franziska; Tang, Jianhui; Xie, Zhiyong; Ebinghaus, Ralf
    The production and use of long-chain perfluoroalkyl substances (PFASs) must comply with national and international regulations. Driven by increasingly stringent regulations, their production has been outsourced to less regulated countries in Asia. In addition, the fluoropolymer industry started to use fluorinated alternatives, such as 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoic acid (HFPO-DA). Between August 2013 and September 2014, we investigated the occurrence and distribution of HFPO-DA and legacy PFASs in surface waters of the following river/estuary systems: the Elbe and Rhine Rivers in Germany, the Rhine-Meuse delta in The Netherlands, and the Xiaoqing River in China. Distinct differences were revealed among the study areas; notably,...

  17. Perfluoroalkyl Substances (PFASs) in the North Sea, its tributaries and the Xiaoqing River in China

    Heydebreck, Franziska; Tang, Jianhui; Xie, Zhiyong; Ebinghaus, Ralf
    The production and use of long-chain perfluoroalkyl substances (PFASs) must comply with national and international regulations. Driven by increasingly stringent regulations, their production has been outsourced to less regulated countries in Asia. In addition, the fluoropolymer industry started to use fluorinated alternatives, such as 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoic acid (HFPO-DA). Between August 2013 and September 2014, we investigated the occurrence and distribution of HFPO-DA and legacy PFASs in surface waters of the following river/estuary systems: the Elbe and Rhine Rivers in Germany, the Rhine-Meuse delta in The Netherlands, and the Xiaoqing River in China. Distinct differences were revealed among the study areas; notably,...

  18. Differential photosynthetic responses of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes

    Wu, Yaping; Yue, Furong; Xu, Juntian; Beardall, John
    We studied the photophysiological response to ultraviolet radiation (UVR) of two diatoms, isolated from different environmental niches. Both species showed the highest sensitivity to UV radiation under relatively low temperature, while they were less inhibited under moderately increased temperature. Under the highest temperature applied in this study, the benthic diatom Nitzschia sp. showed minimal sensitivity to UV radiation, while inhibition of the planktonic species, Skeletonema sp., increased further compared with that at the growth temperature. These photochemical responses were linked to values for the repair and damage processes within the cell; higher damage rates and lower repair rates were observed...

  19. Meiofauna counts during POLARSTERN cruise ANT-XXIX/3 in January-March 2013: Weddell Sea, Bransfield Strait, Drake Passage

    Veit-Köhler, Gritta; Durst, Stephan; Schuckenbrock, Jan; Hellmann, Annika; Bruhn, Marco; Durán Suja, Laura; Hauquier, Freija
    In Weddell Sea, Bransfield Strait, and Drake Passage samples for meiofauna communities and sediment analyses were collected with a multicorer. Meiofauna communities included individuals from 19 higher taxa (sieve size 32 µm). The highest meiofauna abundances were found at slopes in the Weddell Sea. For Bransfield Strait and Drake Passage a sampling scheme of slopes and adjacent troughs was applied. This study was supported by the Alfred-Wegener-Institute, Helmholtz-Centre for Polar and Marine Research (Grant AWI_PS81_03).

  20. Bacterial and eukaryotic operational taxonomic units (OTU) in sea ice, water and deep-sea sediment samples of the Central Arctic collected during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012

    Rapp, Josephine Z; Fernández-Méndez, Mar; Bienhold, Christina; Boetius, Antje
    We aimed to explore the community composition and turnover of eukaryotic and bacterial microorganisms associated with ice-associated and sinking algal aggregates, as well as their similarity to potential source communities of sea ice, water and deep-sea sediments using Illumina tag sequencing. We sampled algae aggregates growing in melt ponds on sea ice, deposited algae aggregates at the seafloor in more than 4000 m water depth, sea ice, upper water column, sediment surface and the gut content of holothurians feeding on the deposits.

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