Recursos de colección

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

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Citable datasets

Mostrando recursos 1 - 20 de 27.838

  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. Hydroacoustic data showing the emergence of a methane-related pockmark field in the Helgoland Reef area in the German Bight

    Krämer, Knut; Holler, Peter; Herbst, Gabriel; Bratek, Alexander; Ahmerkamp, Soeren; Neumann, Andreas; Bartholomä, Alexander; van Beusekom, Justus; Holtappels, Moritz; Winter, Christian
    A series of multibeam bathymetry surveys revealed the emergence of a large pockmark field in the southeastern North Sea. Covering an area of around 915 km^2, up to 1,200 pockmarks per square kilometer have been identified. The time of emergence can be confined to 3 months in autumn 2015, suggesting a very dynamic genesis. The gas source and the trigger for the simultaneous outbreak remain speculative. Subseafloor structures and high methane concentrations of up to 30 µmol/l in sediment pore water samples suggest a source of shallow biogenic methane from the decomposition of postglacial deposits in a paleo river valley....

  3. 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...

  4. Surficial sediment texture from the Iberian Atlantic Margin Sediments Database (IBAM-Sed)

    Costas, Susana; Ramires, Margarida; Pereira da Rocha, Eugenia Barroca; de Paiva Pinto Mendes, Maria; Matias, Ana; Margarida de Almeida Matias, Ana; Vousdoukas, Michalis; Duarte Nunes, Mara Lucia; Oliveira, Sonia; Ferreira, Carlos Loureiro; Carrasco, Ana Rita; Pacheco, André Miguel Duarte
    The SW Iberian Atlantic Margin Sediments Database (IBAM-Sed) integrates the results from textural analysis of surficial sediment samples collected within the frame of several projects developed at the Centre for Marine and Environmental Research (CIMA).

  5. 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.

  6. 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,...

  7. 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,...

  8. 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...

  9. Profiles of liquid water content and wet-snow fraction around capillary barriers in layered snow measured during infiltration experiments in a cold laboratory

    Avanzi, Francesco; Hirashima, Hiroyuki; Yamaguchi, Satoru
    These files include data of volumetric liquid water content and wet-snow fraction measured in layered snow during infiltration experiments in a cold laboratory. Twelve experiments were performed using snow with different grain size and under different water input rates. Profiles are reported in terms of depth from the top surface of each sample (first column). Additional information may be found in the mentioned paper.

  10. Age and stable isotopic record of high and lower latitude of the Pacific

    Rippert, Nadine; Max, Lars; Mackensen, Andreas; Cacho, Isabel; Povea, Patricia; Tiedemann, Ralf
    The Eastern Equatorial Pacific (EEP) is a key area to understand past oceanic processes that control atmospheric CO2 concentrations. Many studies argue for higher nutrient concentrations by enhanced nutrient transfer via Southern Ocean Intermediate Water (SOIW) to the low-latitude Pacific during glacials. Recent studies, however, argue against SOIW as the primary nutrient source, at least during early Marine Isotope Stage 2 (MIS 2), as proxy-data indicate that nutrients are better utilized in the Southern Ocean under glacial conditions. New results from the subarctic Pacific suggest that enhanced convection of nutrient-rich Glacial North Pacific Intermediate Water (GNPIW) contributes to changes in...

  11. Age-depth relationship, XRF/physical properties, and XRD anlaysis of sediment cores MSM09/2_467-3 (GeoTü SL 174) and MSM09/2_455-13 (GeoTü SL 170)

    Jackson, Rebecca; Carlson, Anders E; Hillaire-Marcel, Claude; Wacker, Lukas; Vogt, Christoph; Kucera, Michal
    The chronology of deglacial meltwater pulses from the Laurentide Ice Sheet is well documented. However, the deglacial history of the North American-Arctic (north-eastern Laurentide and Innuitian) and western Greenland ice sheets draining into the Labrador Sea via Baffin Bay is less well constrained. Here we present new high-resolution, radiocarbon-dated records from the central Baffin Bay spanning ~17 to 10 kyr BP and documenting the full deglacial history of Baffin Bay. Sedimentological and geochemical data confirm the presence of two periods of enhanced detrital carbonate delivery, termed Baffin Bay Detrital Carbonate Events (BBDCs). These events are dated to ~14.2-13.7 kyr BP...

  12. Benthic foraminifera census counts and compilation of the isotope, grain size, TOC, CaCO3 and XRF data records of sediment core SO236_052-4

    Bunzel, Dorothea; Schmiedl, Gerhard; Lindhorst, Sebastian; Mackensen, Andreas; Reolid, Jesus; Romahn, Sarah; Betzler, Christian G
    As a natural sediment trap, marine sediments of the sheltered central part of the Maldives Inner Sea represent an exceptional archive for paleoenvironmental and climate changes of the equatorial Indian Ocean. To evaluate the complex interplay between high-latitude and monsoonal climate variability, related dust fluxes, and regional oceanographic responses, we focused on Fe/Al, Ti/Al and Si/Ca ratios as proxies for terrigenous sediment delivery, and total organic carbon (TOC) and Br XRF counts as proxies for marine productivity. Benthic foraminiferal fauna distributions, grain size, and stable ?18O and ?13C data were used for evaluating changes in the benthic ecosystem, as well...

  13. Benthic foraminifera census counts and compilation of the isotope, grain size, TOC, CaCO3 and XRF data records of sediment core SO236_052-4

    Bunzel, Dorothea; Schmiedl, Gerhard; Lindhorst, Sebastian; Mackensen, Andreas; Reolid, Jesus; Romahn, Sarah; Betzler, Christian G
    As a natural sediment trap, marine sediments of the sheltered central part of the Maldives Inner Sea represent an exceptional archive for paleoenvironmental and climate changes of the equatorial Indian Ocean. To evaluate the complex interplay between high-latitude and monsoonal climate variability, related dust fluxes, and regional oceanographic responses, we focused on Fe/Al, Ti/Al and Si/Ca ratios as proxies for terrigenous sediment delivery, and total organic carbon (TOC) and Br XRF counts as proxies for marine productivity. Benthic foraminiferal fauna distributions, grain size, and stable ?18O and ?13C data were used for evaluating changes in the benthic ecosystem, as well...

  14. Marine bacterial richness increases towards higher latitudes in the eastern Indian Ocean

    Raes, Eric; Bodrossy, Levente; Van De Kamp, Jodie; Bissett, Andrew; Waite, Anya M
    Abstract: We investigated the bacterial community structure in surface waters along a 2500 km transect in the eastern Indian Ocean. Using high throughput sequencing of the 16S rRNA gene we measured a significant latitudinal increase in bacterial richness from 800 to 1400 OTUs (42% increase; r2=0.65; p<0.001) from the tropical Timor Sea to the colder temperate waters. Total dissolved inorganic nitrogen, chl a, phytoplankton community structure and primary productivity strongly correlated with bacterial richness (all p<0.01). Our data suggest that primary productivity drives greater bacterial richness. Because, N2-fixation accounts for up to 50% of new production in this region we...

  15. Aeolian transport and deposition of plant wax n-alkanes across the tropical North Atlantic Ocean

    Schreuder, Laura T; Stuut, Jan-Berend W; Korte, Laura F; Sinninghe Damsté, Jaap S; Schouten, Stefan
    Long chain n-alkanes are terrestrial higher plant biomarkers used to reconstruct continental paleoclimatic and paleohydrological conditions with marine sedimentary archives. Latitudinal variation in their concentration and distribution in marine sediments relatively close to the continent has been widely studied, but little is known on how far this continental signal extends into the ocean. Furthermore, no studies have examined the seasonal variation in the deposition of these biomarkers in marine sediments. Here we studied longitudinal variation in the composition of long chain n-alkanes and two other terrestrial higher plant biomarkers (long chain n-alkanols and long chain fatty acids) in atmospheric particles,...

  16. Branched GDGTs of sediment and soil samples from Svalbard

    Peterse, Francien; Kim, Jung-Hyun; Schouten, Stefan; Klitgaard-Kristensen, Dorthe; Koç, Nalân; Sinninghe Damsté, Jaap S
    Branched glycerol dialkyl glycerol tetraethers (GDGTs) are membrane lipids of unknown bacteria that are ubiquitous in soil and peat. Two indices based on the distribution of these lipids in soils, the Cyclization of Branched Tetraethers (CBT) and the Methylation of Branched Tetraethers (MBT) indices have been shown to correlate with soil pH, and mean annual air temperature (MAT) and soil pH, respectively, and can be used to reconstruct MAT in palaeoenvironments. To verify the extent to which branched GDGTs in marine sediments reflect the distribution pattern on land and whether these proxies are applicable for palaeoclimate reconstruction in high latitude...

  17. Branched GDGTs of sediment and soil samples from Svalbard

    Peterse, Francien; Kim, Jung-Hyun; Schouten, Stefan; Klitgaard-Kristensen, Dorthe; Koç, Nalân; Sinninghe Damsté, Jaap S
    Branched glycerol dialkyl glycerol tetraethers (GDGTs) are membrane lipids of unknown bacteria that are ubiquitous in soil and peat. Two indices based on the distribution of these lipids in soils, the Cyclization of Branched Tetraethers (CBT) and the Methylation of Branched Tetraethers (MBT) indices have been shown to correlate with soil pH, and mean annual air temperature (MAT) and soil pH, respectively, and can be used to reconstruct MAT in palaeoenvironments. To verify the extent to which branched GDGTs in marine sediments reflect the distribution pattern on land and whether these proxies are applicable for palaeoclimate reconstruction in high latitude...

  18. Tracks of GPS-Drifter from offshore wind farm Borkum Riffgrund 1

    Massmann, Silvia; Lorkowski, Ina; Carrasco, Ruben; Horstmann, Jochen; Janssen, Frank
    GPS track of albatros MD03i drifters with drag anchors in about 0.9m to 2.0m depth deployed during Havariekommando oil pollution combatting exercise in the offshore wind farm.

  19. Tracks of GPS-Drifter from offshore wind farm Borkum Riffgrund 1

    Massmann, Silvia; Lorkowski, Ina; Carrasco, Ruben; Horstmann, Jochen; Janssen, Frank
    GPS track of albatros MD03i drifters with drag anchors in about 0.9m to 2.0m depth deployed during Havariekommando oil pollution combatting exercise in the offshore wind farm.

  20. Geochemistry of Arctic marine sediments

    Kim, Jung-Hyun; Peterse, Francien; Willmott, Verónica; Klitgaard-Kristensen, Dorthe; Baas, Marianne; Schouten, Stefan; Sinninghe Damsté, Jaap S
    Soils, fine-grained ice-rafted detritus (IRD), coals, and marine surface sediments in the Arctic realm (Svalbard) were collected in 2007 and 2008 to characterize organic matter (OM) sources in Arctic marine sediments. Bulk geochemical (C:N ratio and stable carbon isotopic composition) parameters suggest a predominant marine contribution to sedimentary OM. The branched and isoprenoid tetraether index (a proxy of soil OM input) indicates that soil OM contribution to the marine sediments is minor. However, the presence of retene (used as an indicator for coal-derived OM), the low carbon preference index and the average chain length of n-alkanes, and the depleted bulk...

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