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

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Citable datasets

Mostrando recursos 1 - 20 de 12.127

  1. Circadian clock involvement in zooplankton diel vertical migration, link to supplementary material

    Häfker, Sören
    Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet....

  2. Bulk sediment geochemistry (Ti/Al, TOC, TOC d13C) and G. ruber stable isotope records of sediment cores PS009PC and MS21PC

    Hennekam, Rick; Donders, Timme H; Zwiep, Karin; de Lange, Gert Jan
    We compare geochemical and pollen data of several well-dated, high-resolution cores to provide an integral Holocene overview of Nile outflow, sedimentation, and vegetation in and around the Nile delta. We show that the focus point of the Nile plume varied considerably, as indicated by planktonic foraminifer Globigerinoides ruber oxygen isotopes tracing Nile discharge differences in an east-west delta transect. At 13-11.5 cal kyr BP, Nile discharge was low and runoff was predominantly directed to the western part of the delta. Sediment arriving in the delta during that period was dominated by Ethiopian Highland (~Blue Nile) material, shown by high Ti/Al...

  3. West Antarctic Ice Sheet retreat driven by Holocene warm water incursions, supplementary data

    Hillenbrand, Claus-Dieter; Smith, James A; Hodell, David A; Greaves, Mervyn; Poole, Christopher R; Kender, Sev; Williams, Mark; Andersen, Thorbjørn Joest; Jernas, Patrycja E; Elderfield, Henry; Klages, Johann Philipp; Robertson, Scott B; Gohl, Karsten; Larter, Robert D; Kuhn, Gerhard
    Will be added after publishing

  4. Seagrass meadows of Pohnpei and And Atoll, Federated States of Micronesia, derived from field surveys conducted 26 October-03 November, 2005

    McKenzie, Len J; Rasheed, Michael J
    Approximately 4,403.6 ±324.3 hectares (ha) of predominately intertidal and shallow subtidal seagrass meadows were mapped in the waters surrounding Pohnpei Island and And Atoll between 26 October and 3 November 2005. This was the first comprehensive survey of seagrass resources surrounding Pohnpei Island and And Atoll. The survey involved examination of 508 field validation points and identified 260 individual meadows. 3 species of seagrass (Cymodocea rotundata, Enhalus acoroides and Thalassia hemprichii) were identified in the shallow waters surrounding Pohnpei Island, and 2 species at And Atoll (Enhalus acoroides was absent). 21.3 ±11.8 hectares (ha) of seagrass was mapped in 8...

  5. Major elemental concentrations from NGRIP ice core across the interstadial period GI-21.2

    Della Lunga, Damiano; Müller, Wolfgang; Rasmussen, Sune Olander; Svensson, Anders M; Vallelonga, Paul
    Several abrupt shifts from periods of extreme cold (Greenland stadials, GS) to relatively warmer conditions (Greenland interstadials, GI) called Dansgaard-Oeschger events are recorded in the Greenland ice cores. Using cryo-cell UV-laser-ablation inductively-coupled-plasma mass spectrometry (UV-LA-ICPMS), we analysed a 2.85 m NGRIP ice core section (~ 250 years; 2691.50-2688.65 m depth) across the transitions of GI-21.2, a short-lived interstadial prior to interstadial GI-21.1 (GI-21.2: 84.87-85.09 ka b2k). GI-21.2 is a ~100-year-long period with d18O values 3-4 per mil higher than the following ~200 years of stadial conditions (GS-21.2), which precede the major GI-21.1 warming. We report concentrations of "major" elements indicative...

  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. Geochemistry of sapropel S1 deposits in the Adriatic Sea

    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...

  9. 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).

  10. 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).

  11. 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...

  12. 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.

  13. Geochemistry of porewater and sediments of calcite in porous media

    Baumann, Joachim
    Ein grosse Teil! ca. 10 - 15%, der Sedimentgesteine der Erdkruste wird von Karbonaten im wesentlichen Kalkstein und Dolomit, aufgebaut (FAIRBRIDGE et al. 1967). Lösungs- und Fällungsreaktione von Kalziumkarbonat spielen schon bei deren Genese (Frühdiagenese) (WALTE & MORSE 1985) und verstärkt bei der Verwitterung eine zentrale Rolle. Die chemische Wechselwirkung zwischen Karbonatgesteinen und Wasser beeinflusst deren Porosität und Permeabilität und damit wesentliche hydrodynamische Eigenschaften (HANSHAW & BACK 1979) und bestimmt weitgehend den Chemismus der Sicker- und Grundwasser.

  14. Seawater carboante chemistry and copper toxicity in the green tide alga Ulva prolifera in laboratory experiment

    Gao, Guang; Liu, Yameng; Li, Xinshu; Feng, Zhihua; Xu, Zhiguang; Wu, Hongyan; Xu, Juntian; Yang, Yan
    Cu is considered to be toxic to macroalgae at higher levels. Ocean acidification can also alter the physiological performances of macroalgae. However, little is known regarding the interactive effects of Cu and ocean acidification on macroalgae. In this study, a green tide macroalga, Ulva prolifera, was cultured at the conditions of three levels of Cu (control, 0.5 µM, and 2 µM) and pCO2 (ambient, 1000 µatm, and 1400 µatm) to investigate the responses of U. prolifera to interaction of Cu exposure and ocean acidification. The relative growth rate of thalli decreased with the rise of Cu for all pCO2 conditions...

  15. Annotated record of the detailed examination of Mn deposits from DSDP Leg 84 (Holes 565 and 568)

    von Huene, Roland; Aubouin, Jean
    The Middle America Trench was first drilled in 1979 during Leg 66 off Oaxaca, Mexico and Leg 67 off Guatemala as part of a broad effort to study the mechanics of plate subduction and continental accretion and erosion. Leg 84 was recommended by the JOIDES Advisory Panels specifically to further examine the tectonic and gas-hydrate problems which had been revealed in the previous survey.

  16. Annotated record of the detailed examination of Mn deposits from DSDP Leg 82 (Holes 556, 558, 559, 562, 563, 564)

    Bougault, Henri; Cande, Steven C
    One of the most important geologic discoveries of the 1960s was the remarkable uniformity of the basalts produced at mid-ocean ridges. These basalts have a markedly different tholeiitic composition compared to the alkalic basalts from ocean islands. But very little is known about temporal variations in the composition of basalts derived from one or several mantle sources associated with both normal and anomalously shallow sections of the mid-ocean ridges. The strategy for drilling on DSDP Leg 82 was to set up a broad grid encompassing all possible drilling sites west and southwest of the present Azores Triple Junction in order...

  17. Organic-walled dinoflagellate cyst analysis of sediment core GeoB8331-4 and from surface sediment samples off western South Africa

    Zhao, Xueqin; Dupont, Lydie M; Schefuß, Enno; Bouimetarhan, Ilham; Wefer, Gerold
    Atmospheric and oceanographic interactions between the Atlantic and Indian Oceans influence upwelling in the southern Benguela upwelling system. In order to obtain a better knowledge of paleoceanographic and paleoenvironmental changes in the southern Benguela region during the Holocene, 12 marine surface sediment samples and one gravity core GeoB8331-4 from the Namaqualand mudbelt off the west coast of South Africa have been studied for organic-walled dinoflagellate cysts in high temporal resolution. The results are compared with pollen and geochemical records from the same samples. Our study emphasizes significantly distinct histories in upwelling intensity as well as the influence of fluvial input...

  18. Geochemistry on Mn-nodules from Leg81

    Jehanno, Celestine; Lallier-Verges, Elisabeth; Bonnot-Courtois, Chantal; Desprairies, Alain; Bijon, J; Rivière, Marc
    ree types of concretions were recovered during Leg 81 from Holes 552A, 553A, and 554A, located on the west margin of the Rockall Plateau. In the sedimentary section, these concretions are located at the level of major unconformities, in condensed sequences representing a period from early Eocene to Miocene. This study is a detailed mineralogical and geochemical investigation that permits comparison among the three holes and between the fossil Leg 81 concretions and recent polymetallic nodules found on the ocean floor.

  19. Analysis of Mn-depositis from the Briançon area, France

    Bourbon, Maurice
    This text offers a general introduction to the geological history of the North-Tethys Platform from the Malm to the Lower Eocene periods. It is followed by three parts: a sedimentology development, a geochemical study and a part devoted to the reconstitution of the environment and the sedimentation rates, the subsidence, the depth and the morphology of the seabed and therefore the paleogeography of the Briançonnais domain. The last two chapters deal, one with the evolution of the Briançonnais domain in the context of events affecting Western Tethys and the Central Atlantic, and the other with two sedimentation models deduced from...

  20. Coccolithophore assemblage and palaeoproductivity proxies at sediment core PS75/059-2

    Saavedra-Pellitero, Mariem; Baumann, Karl-Heinz; Ullermann, Johannes; Lamy, Frank
    This work aims to provide new insights into environmental conditions during late Pleistocene Marine Isotope Stage 11 (MIS 11) in the Southern Ocean. We generated a multi-proxy coccolithophore dataset based on sediment core PS75/059-2. This core was retrieved at the western flank of the southern East Pacific Rise crest at ~3600 m water depth. Coccolithophore assemblage counts indicated that the coccolith fraction (CF; <20 µm) during MIS 11 was dominated by Gephyrocapsa caribbeanica and subsequently by small Gephyrocapsa. Coccolith accumulation rates, CF Sr/Ca data and temperature-corrected CF Sr/Ca records were consistent and showed a steep increase in coccolithophore productivity as...

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