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PANGAEA - Publishing Network for Geoscientific & Environmental Data (837.712 recursos)

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

Mostrando recursos 1 - 20 de 24.783

  1. The southwest Indian Ocean Bathymetric Compilation (swIOBC)

    Dorschel, Boris; Jensen, Laura; Arndt, Jan Erik; Brummer, Geert-Jan A; de Haas, Henk; Fielies, Anthony; Franke, Dieter; Jokat, Wilfried; Krocker, Ralf; Pätzold, Jürgen; Schneider, Ralph R; Spieß, Volkhard; Stollhofen, Harald; Uenzelmann-Neben, Gabriele; Watkeys, Mike; Wiles, Errol A
    We present a comprehensive regional bathymetric data compilation for the southwest Indian Ocean (swIOBC) covering the area from 4°S to 40°S and 20°E to 45°E with a spatial resolution of 250 m. For this, we used multibeam and singlebeam data as well as data from global bathymetric data compilations. We generated the swIOBC using an iterative approach of manual data cleaning and gridding, accounting for different data qualities and seamless integration of all different kinds of data. In comparison to existing bathymetric charts of this region the new swIOBC benefits from nearly four times as many data-constrained grid cells and...

  2. Annotated record of the detailed examination of Mn deposits uncovered at the Mohole Experiment Site I, Pacific Ocean

    Murata, K J; Erd, R C

  3. Annotated record of the detailed examination of an Mn deposit uncovered at US Coast Guard Station NOVEMBER in the Pacific Ocean

    Husby, David M
    An extremely large manganese encrusted rock (allegedly called, manganese nodule) inadvertently retrieved by the USGC PONTCHARTRAIN (WHEC-70) during a deep Nansen cast on Ocean Station NOVEMBER in 3749 meters of water in September 1967. This specimen, weighing approximately 240 Kg., was entangled in the oceanographic cable which was accidentally laid on the bottom. Scientists from the Scripps Institution of Oceanography subsequently identified the rock as probably the largest manganese nodule ever found. At that time, the term "manganese nodule" was still used to describe any deepsea recovery of a manganese surfaced object as in the case of the famous "Horizon"...

  4. Paleo Islands and Archipelago Configuration (PIAC) database

    Norder, Sietze Johannes; Baumgartner, J B; Borges, P A V; Hengl, Tomislav; Kissling, W D; Van Loon, E E; Rijsdijk, K F
    Here, we present the Paleo Islands and Archipelago Configuration (PIAC) database, containing sea level driven paleogeography changes over the late Quaternary of 178 islands in 27 archipelagos. The R functions developed to calculate archipelago configuration and paleo-area are provided to allow calculations for other islands, time steps, and higher spatiotemporal resolutions.

  5. Paleo Islands and Archipelago Configuration (PIAC) database

    Norder, Sietze Johannes; Baumgartner, J B; Borges, P A V; Hengl, Tomislav; Kissling, W D; Van Loon, E E; Rijsdijk, K F
    Here, we present the Paleo Islands and Archipelago Configuration (PIAC) database, containing sea level driven paleogeography changes over the late Quaternary of 178 islands in 27 archipelagos. The R functions developed to calculate archipelago configuration and paleo-area are provided to allow calculations for other islands, time steps, and higher spatiotemporal resolutions.

  6. Seawater carbonate chemistry and Calcium carbonate (CaCO3) sediment dissolution

    Lantz, C A; Carpenter, Robert C; Edmunds, Peter J
    Ocean acidification (OA), attributed to the sequestration of atmospheric carbon dioxide (CO2) into the surface ocean, and coastal eutrophication, attributed in part to land-use change and terrestrial runoff of fertilizers, have received recent attention in an experimental framework examining the effects of each on coral reef net ecosystem calcification (Gnet). However, OA and eutrophication in conjunction have yet to receive attention from the perspective of coral reef sediment dissolution. To address this omission, CO2 and nitrate (NO3-) addition experiments were performed in Mo'orea, French Polynesia. Incubation chambers were used to measure sediment Gnet during the day and night under three...

  7. Eddy-permitting and eddy-resolving simulations of the Fram Strait ocean dynamics with the Finite-Element Sea-Ice Ocean Model (FESOM), links to NetCDF files

    Wekerle, Claudia; Wang, Qiang; von Appen, Wilken-Jon; Danilov, Sergey; Schourup-Kristensen, Vibe; Jung, Thomas
    Eddy driven recirculation of Atlantic Water (AW) in the Fram Strait modifies the amount of heat that reaches the Arctic Ocean, but is difficult to constrain in ocean models due to very small Rossby radius there. In this study we explore the effect of resolved eddies on the AW circulation in a locally eddy-resolving simulation of the global Finite-Element-Sea ice-Ocean-Model (FESOM) integrated for the years 2000-2009, by focusing on the seasonal cycle. An eddy-permitting simulation serves as a control run. Our results suggest that resolving local eddy dynamics is critical to realistically simulate ocean dynamics in the Fram Strait. Strong...

  8. Impact of sedimentary degradation and deep water column production on GDGT abundance and distribution in surface sediments in the Arabian Sea

    Lengger, Sabine K; Hopmans, Ellen C; Sinninghe Damsté, Jaap S; Schouten, Stefan
    The TEX86 is a widely used paleotemperature proxy based on isoprenoid glycerol dibiphytanyl glycerol tetraethers (GDGTs) produced by Thaumarchaeota. Archaeal membranes are composed of GDGTs with polar head groups (IPL-GDGTs), most of which are expected to be degraded completely or transformed into more recalcitrant core lipid (CL)-GDGTs upon cell lysis. Here, we examined the differences in concentration and distribution of core lipid (CL)- and intact polar lipid (IPL)-GDGTs in surface sediments at different deposition depths, and different oxygen bottom water concentrations (<3-83 µmol L-1). Surface sediments were sampled from 900 to 3000 m depth on a seamount (Murray Ridge), whose...

  9. Annotated record and Pb, Th, U and Ra isotope concentrations for two cores of the Atlantic and Pacific Ocean

    Kadko, David
    A model that predicts the flux of 222Rn out of deep-sea sediment is presented. The radon is ultimately generated by 230Th which is stripped from the overlying water into the sediment. It is shown that the continental contribution of ionium is not significant, and that at low sedimentation rates, biological mixing and erosional processes strongly affect the surface concentration of the ionium. Two cores from areas of slow sediment accumulation, one from a manganese nodule region of the central Pacific and one from the Rio Grande Rise in the Atlantic were analyzed at closely spaced intervals for 230Th, 226Ra, and...

  10. Major elements geochemistry of manganese nodules and ferromanganese crusts from the Pacific Ocean

    Mellin, Torgny A; Lei, Guobin
    Experimental substitutions of transition and alkaline earth cations into synthetic 10angstrom(Na-)-manganate show that cation uptake and the stability of the cation-substituted mineral increase with stability of the hydroxide of the cation. Hydrothermal treatment of synthetic 10angström-manganates with different metal contents as well as marine diagenetic and hydrothermal 10angstrom-manganates shows that the stabilities of their structures are enhanced with increasing temperature. The stabilization is due to reinforcement of the "tunnel" walls supporting the [Mn4+O62-] octaheral layers. The diagenetic 10angström-manganates have initially unstable buserite-like structures with each interlayer wall composed of two [Mn2+O3+x2-(OH-)3-x] octahedra (0 less-than-or-equal-to x less-than-or-equal-to 3) with either a...

  11. Methane and nitrous oxide concentration profiles, CTD and nutrient data from the Central Baltic Sea between March and December 2015, following the major Baltic Inflow of 2014

    Myllykangas, Jukka-Pekka; Jilbert, Tom; Jakobs, Gunnar; Rehder, Gregor; Werner, Jan; Hietanen, Susanna
    In late 2014, a large, oxygen-rich salt water inflow entered the Baltic Sea and caused considerable changes in deep water oxygen concentrations. We studied the effects of the inflow on the concentration patterns of two greenhouse gases, methane and nitrous oxide, during the following year (2015) in the water column of the Gotland Basin. In the Eastern basin, methane which had previously accumulated in the deep waters was largely removed during the year. Here, volume-weighted mean concentration below 70 m decreased from 108 nM in March to 16.3 nM over a period of 141 days (0.65 nM d-1), predominantly due...

  12. Modelling past, present and future peatland carbon accumulation across the pan-Arctic

    Chaudhary, Nitin; Miller, Paul A; Smith, Benjamin
    Most northern peatlands developed during the Holocene, sequestering large amounts of carbon in terrestrial ecosystems. However, recent syntheses have highlighted the gaps in our understanding of peatland carbon accumulation. Assessments of the long-term carbon accumulation rate and possible warming driven changes in these accumulation rates can therefore benefit from process-based modelling studies. We employed an individual- and patch-based dynamic global ecosystem model with dynamic peatland and permafrost functionality and vegetation dynamics to quantify long-term carbon accumulation rates and to assess the effects of historical and projected climate change on peatland carbon balances across the pan-Arctic. Our results are broadly consistent...

  13. West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL) high-resolution climate simulation data, links to subset of variables at daily and monthly temporal resolution in NetCDF format

    Heinzeller, Dominikus; Dieng, Diarra; Smiatek, Gerhard; Olusegun, Christiana F; Klein, Cornelia; Hamann, Ilse; Kunstmann, Harald
    With climate change being one of the most severe challenges to Africa in the 21st century, West Africa is facing an urgent need to develop effective adaptation and mitigation measures. WASCAL (West African Science Service Centre on Climate Change and Adapted Land Use, http://www.wascal.org) is a large-scale research-focused Climate Service Centre designed to help tackle this challenge and thereby enhance the resilience of human and environmental systems to climate change and increased variability. It does so by strengthening the research infrastructure and capacity in West Africa related to climate change and by pooling the expertise of ten West African countries...

  14. Observation of manganese deposits on Kaikata Seamount, Izu-Ogasawara (Bonin) Arc by the Shikai 2000 submersible

    Usui, Akira; Nishimura, Akira
    During Dive 408 of Shinkai 2000 on the flank of the Kaikata Seamount located on the volcanic front of the Izu-Ogasawara (Bonin) Arc, possibly recent hydrothermal manganese deposits were observed on sandy volcanic sediments at water depths of between 800 and 1200 m. The deposits cover almost the entire surface sediment across the manganese belt on the northwestern flank on the seamount on a scale of kilometers. The occurrence of the deposits, seafloor morphology and temperature of the sediments, together with previous shipboard results, lead to a possible model for the formation of the manganese deposits: A low-temperature hydrothermal solution...

  15. Observation of manganese deposits on Kaikata Seamount, Izu-Ogasawara (Bonin) Arc by the Shikai 2000 submersible

    Usui, Akira; Nishimura, Akira
    During Dive 408 of Shinkai 2000 on the flank of the Kaikata Seamount located on the volcanic front of the Izu-Ogasawara (Bonin) Arc, possibly recent hydrothermal manganese deposits were observed on sandy volcanic sediments at water depths of between 800 and 1200 m. The deposits cover almost the entire surface sediment across the manganese belt on the northwestern flank on the seamount on a scale of kilometers. The occurrence of the deposits, seafloor morphology and temperature of the sediments, together with previous shipboard results, lead to a possible model for the formation of the manganese deposits: A low-temperature hydrothermal solution...

  16. Annotated record of the detailed examination of Mn deposits observed during a Continuous Line Bucket test done off the Tuamotu Archipelago

    Masuda, Yoshio; Cruickshank, Michael J; Mero, John L
    Testing of a continuous bucket-line dredging system was carried out in the South Pacific August 23 through September 14, 1970 by Japan Resources Association aboard the vessel "Chiyoda Maru No. 2". Fifteen dredge stations were occupied, and the system was tested at depths of 1080, 3755, and 1220 meters. The system is designed to recover manganese nodules, and the tests helped to verify its feasibility. A brief discussion of the merits of the continuous bucket-line compared to other continuous systems is made.

  17. pCO2 underway data from the Benguela Upwelling System in southeastern South Atlantic Ocean

    Emeis, Kay-Christian; Dähnke, Kirstin; Eggert, Anja; Flohr, Anita; Lahajnar, Niko; Nagel, Niko; Nausch, Birgit; Neumann, Andreas; Rixen, Tim; Schmidt, Martin; Wasmund, Norbert
    Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was developed by "marine analytics and data" (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases...

  18. pCO2 underway data from the Benguela Upwelling System in southeastern South Atlantic Ocean

    Emeis, Kay-Christian; Dähnke, Kirstin; Eggert, Anja; Flohr, Anita; Lahajnar, Niko; Nagel, Niko; Nausch, Birgit; Neumann, Andreas; Rixen, Tim; Schmidt, Martin; Wasmund, Norbert
    Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was developed by "marine analytics and data" (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases...

  19. pCO2 underway data from the Benguela Upwelling System in southeastern South Atlantic Ocean

    Emeis, Kay-Christian; Dähnke, Kirstin; Eggert, Anja; Flohr, Anita; Lahajnar, Niko; Nagel, Niko; Nausch, Birgit; Neumann, Andreas; Rixen, Tim; Schmidt, Martin; Wasmund, Norbert
    Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was developed by "marine analytics and data" (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases...

  20. pCO2 underway data from the Benguela Upwelling System in southeastern South Atlantic Ocean

    Emeis, Kay-Christian; Dähnke, Kirstin; Eggert, Anja; Flohr, Anita; Lahajnar, Niko; Nagel, Niko; Nausch, Birgit; Neumann, Andreas; Rixen, Tim; Schmidt, Martin; Wasmund, Norbert
    Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was developed by "marine analytics and data" (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases...

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