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PANGAEA - Publishing Network for Geoscientific & Environmental Data (831.663 recursos)

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Datasets with PANGAEA technical keyword @JGOFSGermany

Mostrando recursos 1 - 20 de 3.052

  1. Physical oceanography during POSEIDON cruise POS219A/2

    Müller, Thomas J; Spitzy, Alejandro

  2. Physical oceanography during POSEIDON cruise POS219A/1

    Müller, Thomas J; Spitzy, Alejandro

  3. Physical oceanography during POSEIDON cruise POS212/4

    Müller, Thomas J; Knoll, Michaela

  4. Hydrochemistry measured on water bottle samples during SONNE cruise SO120

    Waniek, Joanna J; Kriest, Iris; Lendt, Ralf; Rick, Johannes J; Sellmer, Claudia; Ullrich, Sören; von Bröckel, Klaus

  5. Physical oceanography during POSEIDON cruise POS209/1

    Waniek, Joanna J

  6. Hydrochemistry measured on water bottle samples during METEOR cruise M36/6

    Waniek, Joanna J; Mienert, Jürgen

  7. Physical oceanography during METEOR cruise M27/2

    Waniek, Joanna J

  8. Physical oceanography during METEOR cruise M37/2

    Müller, Thomas J; Wefer, Gerold

  9. Physical oceanography during POSEIDON cruise POS231/3

    Waniek, Joanna J

  10. Physical oceanography during POSEIDON cruise POS231/2

    Waniek, Joanna J

  11. Pteropoda abundances in multinet samples

    Schiebel, Ralf
    The vertical flux and sedimentation rate of planktic foraminiferal tests are quantified and a global planktic foraminiferal CaCO3 budget is presented. Test and calcite flux rates are calculated according to the distribution of species obtained from multinet and sediment trap samples. Modern planktic foraminiferal population dynamics are discussed as a prerequisite for the quantification of the calcite budget, highlighting the importance of ecological, autecological (e.g., reproduction), and biogeochemical conditions that determine the presence or absence of species. To complete the open-marine, particulate CaCO3 inventory, the contribution of coccolithophores, pteropods, and calcareous dinophytes is discussed. Based on the studied regions, the...

  12. Radionuclides measured on water bottle samples

    Geibert, Walter; Rutgers van der Loeff, Michiel M; Hanfland, Claudia; Dauelsberg, Hans-Jürgen
    Actinium is one of the rarest naturally occurring elements on earth. We measured its longest-lived isotope 227Ac (half-life 21.77 yr) for the first time in the water column of the Southeast Pacific, the Central Arctic, the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG). Besides the profile in the Southeast Pacific, which confirms earlier findings about the role of diapycnal mixing for 227Ac distribution, we found three other different types of vertical profiles. These profiles point to a prominent role of advection for 227Ac distribution, especially in the Southern Ocean. Depending on the type of profile found, 227Ac is...

  13. Biogenic flux and primary production of sediment traps in the Atlantic and the Southern Ocean

    Fischer, Gerhard; Ratmeyer, Volker; Wefer, Gerold
    Fluxes of organic carbon normalised to a depth of 1000 m from 18 sites in the Atlantic and the Southern Ocean are presented, comprising nine biogeochemical provinces as defined by Longhurst et al. (1995. Journal of Plankton Research 17, 1245-1271). For comparison with primary production, we used a recent compilation of primary production values derived from CZCS data (Antoine et al., 1996. Global Biogeochemical Cycles 10, 57-69). In most cases, the seasonal patterns stood reasonably well in accordance with the carbon fluxes. Particularly, organic carbon flux records from two coastal sites off northwest and southwest Africa displayed a more distinct...

  14. Fluxes and foraminifera fluxes of sediment traps in the Peru-Chile Current

    Hebbeln, Dierk; Marchant, Margarita; Wefer, Gerold
    Time-series sediment traps were deployed 180 km off the Chilean coast at 30°S in the Peru-Chile Current during the El Niño period 1991/1992 (6 months) and during the 'normal' period 1993/1994 (12 months). Under normal conditions in 1993/1994 the particle fluxes display a pronounced seasonal cycle marked by a settling phytoplankton bloom in September, intermediate fluxes until January, and low fluxes between January and July. This seasonal pattern is also reflected in stable isotope data, measured on the planktic foraminifera species Neogloboquadrina pachyderma (dex.) and Globigerina bulloides, which indicate persistent upwelling conditions between August and February followed by a stratified...

  15. Particle flux measurements from moorings and surface sediment studies of sediment cores in the SE Pacific Ocean

    Romero, Oscar E; Hebbeln, Dierk; Wefer, Gerold
    Flux of siliceous plankton and taxonomic composition of diatom and silicoflagellate assemblages were determined from sediment trap samples collected in coastal upwelling-influenced waters off northern Chile (30°S, CH site) under "normal" or non-El Niño (1993-94) and El Niño conditions (1997-98). In addition, concentration of biogenic opal and siliceous plankton, and diatom and silicoflagellate assemblages preserved in surface sediments are provided for a wide area between 27° and 43°S off Chile. Regardless of the year, winter upwelling determines the maximum production pattern of siliceous microorganisms, with diatoms numerically dominating the biogenic opal flux. During the El Niño year the export is...

  16. Pigment distribution in surface sediments of the North Atlantic Ocean

    Pfannkuche, Olaf; Boetius, Antje; Lundgreen, Ulrich; Lochte, Karin; Thiel, Hjalmar
    In an extended deep-sea study the response of the benthic community to seasonally varying sedimentation rates of organic matter were investigated at a fixed abyssal site in the NE Atlantic (BIOTRANS station or JGOFS station L2 at 47°N-20°W, water depth >4500 m) on four legs of METEOR expedition 21 between March and August 1992. The vertical flux at 3500 m depth and temporal variations in the chloroplastic pigment concentration, a measure of phytodetritus deposition, and of total adenylates and total phospholipids, measures of benthic biomass, and of activity of hydrolytic enzymes were observed. The flux patterns in moored sediment traps...

  17. Flux data in the Southern Ocean

    Wefer, Gerold; Fischer, Gerhard
    Since 1983 time-series traps have been deployed in the Atlantic sector of the Southern Ocean to measure the flux of organic carbon, biogenic silica and carbonate. The organic carbon flux data are used to calculate primary production rates and organic carbon fluxes at 100 m water depth. From these calculations, annual primary production rates range from about 170 g C m**-2 in the coastal area (Bransfield Strait) to almost zero in the Permanent Sea-Ice Zone. High rates (of about 80 g C m**-2 year**-1 ) were calculated for the Polar Front Zone and rather low values (about 20 g C...

  18. Physical, chemical and biological oceanography during Polarstern cruise ANT-X/6

    Smetacek, Victor; de Baar, Hein J W; Bathmann, Ulrich; Lochte, Karin; Rutgers van der Loeff, Michiel M
    The R.V. Polarstern cruise ANT X/6, part of the international Southern Ocean JGOFS programme, investigated phytoplankton spring bloom development and its biogeochemical effects in different water masses of the Atlantic sector of the Southern Ocean: the Polar Frontal region (PFr), the southern Antarctic Circumpolar Current zone (sACC), its boundary with the Weddell Gyre (AWB) and the marginal ice zone (MIZ). The relative roles of physical stability, iron limitation and grazing pressure in enhancing or constraining phytoplankton biomass accumulation were examined. Three sections were carried out between the PFr and the ice edge along the 6°W meridian from early October to...

  19. Planktic foraminiferal populations and test flux in the eastern North Atlantic Ocean

    Schiebel, Ralf; Hemleben, Christoph
    Planktic foraminiferal assemblages vary in response to seasonal fluctuations of hydrographic properties, between water masses, and after periodical changes and episodic events (e.g. reproduction, storms). Distinct annual variability of the planktic foraminiferal flux is also known from sediment trap data. In this paper we discuss the short-term impacts on interannual flux rates based on data from opening-closing net hauls obtained between the ocean surface and 500 m water depth. Data were recorded during April, May, June, and August at around 47°N, 20°W (BIOTRANS) in 1988, 1989, 1990, 1992, 1993, and during May 1989 and 1992 at 57°N, 20-22°W. Species assemblages...

  20. Planktic foraminiferal populations and test flux in the eastern North Atlantic Ocean

    Schiebel, Ralf; Hemleben, Christoph
    Planktic foraminiferal assemblages vary in response to seasonal fluctuations of hydrographic properties, between water masses, and after periodical changes and episodic events (e.g. reproduction, storms). Distinct annual variability of the planktic foraminiferal flux is also known from sediment trap data. In this paper we discuss the short-term impacts on interannual flux rates based on data from opening-closing net hauls obtained between the ocean surface and 500 m water depth. Data were recorded during April, May, June, and August at around 47°N, 20°W (BIOTRANS) in 1988, 1989, 1990, 1992, 1993, and during May 1989 and 1992 at 57°N, 20-22°W. Species assemblages...

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