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PANGAEA - Publishing Network for Geoscientific & Environmental Data (831.629 recursos)

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

Mostrando recursos 1 - 20 de 12.241

  1. Seawater carboante chemistry and algal abundance, growth and flourometry data of a late summer suface sea ice community

    McMinn, Andrew; Müller, Marius N; Martin, Andrew; Ugalde, Sarah C; Lee, Shihong; Castrisios, Katerina; Ryan, Ken G
    Annual fast ice at Scott Base (Antarctica) in late summer contained a high biomass surface community of mixed phytoflagellates, dominated by the dinoflagellate, Polarella glacialis. At this time of the year, ice temperatures rise close to melting point and salinities drop to less than 20. At the same time, pH levels can rise above 9 and nutrients can become limiting. In January 2014, the sea ice microbial community from the top 30 cm of the ice was exposed to a gradient of pH and CO2 (5 treatments) that ranged from 8.87 to 7.12 and 5-215 µmol CO2 kg?1, respectively, and...

  2. Biomass growth and physiological parameters of the macroalga Fucus vesiculosus forma mytili, along with seawater parameters and inorganic nutrient concentrations of the tidal benthic mesocosms on the island of Sylt in spring 2014

    Mensch, Birte; Neulinger, S C; Graiff, Angelika; Pansch, Andreas; Künzel, Sven; Fischer, Martin A; Schmitz, Ruth A
    Ocean acidification and warming effects on the macroalgal species Fucus vesiculosus forma mytili were simulated in the tidal benthic mesocosm facility at the AWI Wadden Sea Station on the island of Sylt, Germany (55°01'19.2''N, 8°26'17.7''E). The SY1 experiment in spring 2014 (11 weeks from early April to late June) was based on a "Temp X pCO2" full-factorial setup (ambient or delta 5°C temperature X ambient or 1000 ppm pCO2) resulting in 4 treatment levels à 3 replicates. The seawater parameters (temperature, pH, salinity, total alkalinity, pCO2) and seawater inorganic nutrient concentrations (silicate, nitrite, phosphate, ammonium, total nitrogen oxide, nitrate) were...

  3. Seawater carboante chemistry and corrosion and results of the mechanical tests of cidaroid (Eucidaris tribuloides) and a euechinoid (Tripneustes ventricosus) in laboratory experiment

    Dery, Aurélie; Collard, Marie; Dubois, Philippe
    Echinoderms are considered as particularly sensitive to ocean acidification (OA) as their skeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbonate. Recent studies have investigated effects of OA on the skeleton of "classical" sea urchins (euechinoids) but the impact of etching on skeleton mechanical properties is almost unknown. Furthermore, the integrity of the skeleton of cidaroids has never been assessed although their extracellular fluid is undersaturated with respect to their skeleton and the skeleton of their primary spines is in direct contact with seawater. In this study, we compared the dissolution of test plates...

  4. Seawater carboante chemistry and growth rate, primary production of Cystoseira tamariscifolia (Phaeophyceae) in laboratory experiment

    Celis-Plá, Paula S M; Martínez, Brezo; Korbee, Nathalie; Hall-Spencer, Jason M; Figueroa, Félix L
    Ocean acidification increases the amount of dissolved inorganic carbon (DIC) available in seawater which can benefit photosynthesis in those algae that are currently carbon limited, leading to shifts in the structure and function of seaweed communities. Recent studies have shown that ocean acidification-driven shifts in seaweed community dominance will depend on interactions with other factors such as light and nutrients. The study of interactive effects of ocean acidification and warming can help elucidate the likely effects of climate change on marine primary producers. In this study, we investigated the ecophysiological responses of Cystoseira tamariscifolia (Hudson) Papenfuss. This large brown macroalga...

  5. Synchronizing early Eocene deep-sea and continental records from the Bighorn Basin Coring Project

    Westerhold, Thomas
    A consistent stratigraphic framework is required to understand the effect of major climate perturbations of the geological past on both marine and terrestrial ecosystems. Transient global warming events in the early Eocene, 56-54 Ma ago, show the impact of large scale input of carbon into the ocean-atmosphere system. Here we provide the first time-scale synchronization of continental and marine deposits spanning the Paleocene-Eocene Thermal Maximum (PETM) and the interval just prior to the Eocene Thermal Maximum 2 (ETM-2). Cyclic variations in geochemical data come from continental drill cores of the Bighorn Basin Drilling Project (BBCP, Wyoming, USA) and from marine...

  6. Geochemistry of sediment core PRGL1-4

    Pasquier, Virgil; Sansjofre, Pierre; Rabineau, Marina; Revillon, Sidonie; Houghton, Jennifer; Fike, David A
    The sulfur biogeochemical cycle plays a key role in regulating Earth's surface redox through diverse abiotic and biological reactions that have distinctive stable isotopic fractionations. As such, variations in the sulfur isotopic composition (d34S) of sedimentary sulfate and sulfide phases over Earth history can be used to infer substantive changes to the Earth's surface environment, including the rise of atmospheric oxygen. Such inferences assume that individual d34S records reflect temporal changes in the global sulfur cycle; this assumption may be well grounded for sulfate-bearing minerals but is less well established for pyrite-based records. Here, we investigate alternative controls on the...

  7. Geochemistry of sapropel S1 deposits in sediment core AMC99-1

    Tesi, Tommaso; Asioli, Alessandra; Minisini, D; Maselli, Vittorio; Dalla Valle, Giacomo; Gamberi, Fabiano; Langone, Leonardo; Cattaneo, Antonio; Montagna, Paolo; Trincardi, Fabio
    The formation of Eastern Mediterranean sapropels has periodically occurred during intensification of northern hemisphere monsoon precipitation over North Africa. However, the large-scale response of the Eastern Mediterranean thermohaline circulation during these monsoon-fuelled freshening episodes is poorly constrained. Here, we investigate the formation of the youngest sapropel (S1) along an across-slope transect in the Adriatic Sea. Foraminifera-based oxygen index, redox-sensitive elements and biogeochemical parameters reveal - for the first time - that the Adriatic S1 was synchronous with the deposition of south-eastern Mediterranean S1 beds. Proxies of paleo thermohaline currents indicate that the bottom-hugging North Adriatic Dense Water (NAdDW) suddenly decreased...

  8. Dissolved inorganic carbon data from 2010 and 2013 at the Gulf of Tehuantepec

    Chapa-Balcorta, Cecilia; Hernández-Ayón, José Martín; Beier Emilio, Durazo Reginaldo; Alin, Simone; López-Pérez, Andrés
    Measurements of dissolved inorganic carbon of 27 stations at the Gulf of Tehuantepec, México. Samples were taken during cruises carried out by the Mexican Navy. Secretaría de Marina Armada de Mexico. Stations sampled in June, 2010 on board of RV Altair, 9 were sampled on April 2013 onbord of RV Altair and 9 on October-November 2013 onboard of RV Río Suchiate. Measurements were carried out using the coulometric method described in Johnson et al (1987).

  9. Seasonal variations of Fucus vesiculosus fertility under ocean acidification and warming in the western Baltic Sea

    Graiff, Angelika; Dankworth, Marie; Wahl, Martin; Karsten, Ulf; Bartsch, Inka
    Ocean warming and acidification may substantially affect the reproduction of keystone species such as Fucus vesiculosus (Phaeophyceae). In four consecutive benthic mesocosm experiments, we compared the reproductive biology and quantified the temporal development of Baltic Sea Fucus fertility under the single and combined impact of elevated seawater temperature and pCO2 (1100 ppm). In an additional experiment, we investigated the impact of temperature (0-25°C) on the maturation of North Sea F. vesiculosus receptacles. A marked seasonal reproductive cycle of F. vesiculosus became apparent in the course of 1 year. The first appearance of receptacles on vegetative apices and the further development...

  10. Spatio-temporal dynamics of cod nursery areas in the Baltic Sea

    Hinrichsen, Hans-Harald; von Dewitz, Burkhard; Lehmann, Andreas; Bergström, Ulf; Hüssy, Karin
    In this study the drift of eastern Baltic cod larvae and juveniles spawned within the historical eastern Baltic cod spawning grounds was investigated by detailed drift model simulations for the years 1971 to 2010, to examine the spatio-temporal dynamics of environmental suitability in the nursery areas of juvenile cod settlement. The results of the long-term model scenario runs, where juvenile cod were treated as simulated passively drifting particles, enabled us to find strong indications for long-term variations of settlement and potentially the reproduction success of the historically important eastern Baltic cod nursery grounds. Only low proportions of juveniles hatched in...

  11. How internal waves in the Tyrrhenian Sea affect meso-scale eddies and thermohaline staircases - insights from seismic oceanography

    Buffet, G; Krahmann, Gerd; Klaeschen, Dirk; Schroeder, Karin; Sallarès, C; Papenberg, Cord; Ranero, César; Zitellini, N

  12. Geochemistry and stable oxygen record of sediment core PS009PC

    Hennekam, Rick; Jilbert, Tom; Schnetger, Bernhard; de Lange, Gert Jan
    We present high-resolution records for oxygen isotopes of the planktic foraminifer Globigerinoides ruber (?18Oruber) and bulk sediment inorganic geochemistry for Holocene-age sediments from the southeast Mediterranean. Our ?18Oruber record appears to be dominated by Nile discharge rather than basin-scale salinity/temperature changes. Nile discharge was enhanced in the early to middle Holocene relative to today. The timing of the long-term maximum in Nile discharge during the early Holocene corresponds to the timing of maximum intensity of the Indian Ocean-influenced Southwest Indian summer monsoon (SIM). This coincidence suggests a major influence of an Indian Ocean moisture source on Nile discharge in the...

  13. Dissolved inorganic carbon, temperature and salinity measurement in the Gulf of Tehuantepec

    Chapa-Balcorta, Cecilia; Hernández-Ayón, José Martín; Beier Emilio, Durazo Reginaldo; Alin, Simone; López-Pérez, Andrés
    Temperature (C°), practical salinity and pressure (dB) data recorded at the Gulf of Tehuantepec during three sampling cruises carried out by the Secretaría de Marina Armada de Mexico. Measurements of dissolved inorganic carbon or 27 stations at the Gulf of Tehuantepec, México.

  14. Model results, link to archive file

    Ziemer, Corinna; Wacker, Ulrike
    The evolution of a hydrometeor ensemble ("cloud" ) can be described using a balance equation for its size spectrum. In numerical weather prediction or climate models, however, this approach is too time consuming. It is therefore necessary to capture, if only approximately, the on-going microphysical processes in a cloud using a parame- terised form of modelling. The parameterisation of sedimentation alone is already a demanding task. If its standard form is used in a two-moment scheme, the mean mass of the hydrometeors will be too large for a cloud physics context. Existing approaches try to avoid excessively large mean masses...

  15. Model results, link to archive file

    Ziemer, Corinna; Jasor, Gary; Wacker, Ulrike; Beheng, Klaus D; Polifke, Wolfgang
    In numerical weather prediction models, parameterisations are used as an alternative to spectral modelling. One type of parameterisations are the so-called methods of moments. In the present study, two different methods of moments, a presumed-number-density-function method with finite upper integration limit and a quadrature method, are applied to a one-dimensional test case ('rainshaft') for drop sedimentation. The results are compared with those of a reference spectral model. An error norm is introduced, which is based on several characteristic properties of the drop ensemble relevant to the cloud microphysics context. This error norm makes it possible to carry out a quantitative...

  16. Model results, link to archive file

    Siewert, Christoph; Bordás, Róbert; Wacker, Ulrike; Beheng, Klaus D; Kunnen, Rudie P J; Meinke, Matthias; Schröder, Wolfgang; Thévenin, Dominique
    This study deals with the comparison of numerically and experimentally determined collision kernels of water drops in air turbulence. The numerical and experimental setups are matched as closely as possible. However, due to the individual numerical and experimental restrictions, it could not be avoided that the turbulent kinetic energy dissipation rate of the measurement and the simulations differ. Direct numerical simulations (DNS) are performed resulting in a very large database concerning geometric collision kernels with 1470 individual entries. Based on this database a fit function for the turbulent enhancement of the collision kernel is developed. In the experiments, the collision...

  17. Model results, link to archive file

    Riechelmann, Theres; Wacker, Ulrike; Beheng, Klaus D; Etling, Dieter; Raasch, Siegfried
    Raindrops in warm clouds grow faster than predicted by classical cloud models. One of the possible reasons for this discrepancy is the influence of cloud turbulence on the coagulation process. In Part I (Siewert et al., 2014, doi:10.1127/0941-2948/2014/0566) of this paper series, a turbulent collision kernel has been derived from wind tunnel experiments and direct numerical simulations (DNS). Here we use this new collision kernel to investigate the influence of turbulence on coagulation and rain formation using two models of different complexity: a one-dimensional model called RAINSHAFT (height as coordinate) with cloud microphysics treated by a spectral bin model (BIN)...

  18. Model results, link to archive file

    Ziemer, Corinna; Wacker, Ulrike
    This paper examines different distribution functions used in a three-moment parameterization scheme with regard to their influence on the implementation and the results of the parameterization scheme. In parameterizations with moment methods, the prognostic variables are interpreted as statistical moments of a drop size distribution, for which a functional form has to be assumed. In cloud microphysics, parameterizations are frequently based on gamma- and log-normal distributions, while for particle-laden flows in engineering, the beta-distribution is sometimes used. In this study, the three-moment schemes with beta-, gamma- and log-normal distributions are tested in a 1D framework for drop sedimentation, and their...

  19. Model results, link to archive file

    Wacker, Ulrike; Ries, Hinnerk; Schättler, Ulrich
    A weather episode, characterized by the passage of synoptic disturbances, is investigated for Dronning Maud Land, Antarctica. Due to the sparsity of observations, information about the spatial and temporal distribution of precipitation at high resolution can be gained only by modelling. The simulations presented here are performed with the high-resolution, non-hydrostatic weather forecast COSMO Model with a horizontal mesh size of 7 km. The comparison with observations at four stations shows that the simulation captures the general meteorological conditions well, while a warm bias and a weak daily cycle are found in near-surface temperatures. With regard to precipitation, the timing...

  20. Model results, link to archive file

    Wacker, Ulrike; Lüpkes, Christof
    Common parametrizationmodels for cloud microphysical processes use condensate mass density and/or particle number density as prognostic properties. However, other moments of the particle size distribution can likewise be chosen for prediction. This study deals with parametrization models with one and two, respectively, prognostic moments for the sedimentation of drop ensembles. The spectral resolving model defines the reference solution. The evolution of the vertical profiles of liquid water content, drop number density and rain rate strongly depend on the choice of the prognostic moments in the parametrizationmodels. Inmodels with a single prognostic moment, its vertical profile is copied by all other moments....

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