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PANGAEA - Publishing Network for Geoscientific & Environmental Data (843.301 recursos)

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

Mostrando recursos 1 - 20 de 26.516

  1. C5 glycolipids of heterocystous cyanobacteria track symbiont abundance in the diatom Hemiaulus hauckii across the tropical North Atlantic

    Bale, Nicole Jane; Villareal, Tracy A; Hopmans, Ellen C; Brussaard, Corina P D; Besseling, Marc; Dorhout, Denise J C; Sinninghe Damsté, Jaap S; Schouten, Stefan
    TS2Diatom-diazotroph associations (DDAs) include marine heterocystous cyanobacteria found as exosymbionts and endosymbionts in multiple diatom species. Heterocysts are the site of N2 fixation and have thickened cell walls containing unique heterocyst glycolipids which maintain a low oxygen environment within the heterocyst. The endosymbiotic cyanobacterium Richelia intracellularis found in species of the diatom genus Hemiaulus and Rhizosolenia makes heterocyst glycolipids (HGs) which are composed of C30 and C32 diols and triols with pentose (C5) moieties that are distinct from limnetic cyanobacterial HGs with predominantly hexose (C6) moieties. Here we applied a method for analysis of intact polar lipids to the study...

  2. Dissolved inorganic carbon, total alkalinity, d18O-H2O, d13C-DIC, temperature, and salinity collected from discrete bottle samples from CCGS Amundsen in the Beaufort Sea during August and September 2014

    Thomas, Helmuth; Mol, Jacoba
    The Mackenzie Shelf in the southeastern Beaufort Sea is a region that has experienced large changes in the past several decades as warming, sea-ice loss, and increased river discharge have altered carbon cycling. Upwelling and downwelling events are common on the shelf, caused by strong, fluctuating along-shore winds, resulting in cross-shelf Ekman transport, and an alternating estuarine and anti-estuarine circulation. Downwelling carries inorganic carbon and other remineralization products off the shelf and into the deep basin for possible long-term storage in the world oceans. Upwelling carries dissolved inorganic carbon (DIC) and nutrient-rich waters from the Pacific-origin upper halocline layer (UHL)...

  3. Organic-walled dinoflagellate cyst data of sediment core GeoB8323-2

    Zhao, Xueqin; Dupont, Lydie M; Schefuß, Enno; Granger, Robyn; Wefer, Gerold
    in preparation

  4. Organic UV stabilizers and UV filters in the sediment of Chinese Bohai and Yellow Seas in 2016

    Apel, Christina; Tang, Jianhui; Ebinghaus, Ralf
    Organic UV stabilizers and UV filters are applied to industrial materials and cosmetics worldwide. In plastics they prevent photo-induced degradation, while in cosmetics they protect human skin against harmful effects of UV radiation. This study reports on the occurrence and distribution of organic UV stabilizers and UV filters in the surface sediment of the Chinese Bohai and Yellow Seas for the first time. In total, 16 out of 21 analyzed substances were positively detected. Concentrations ranged from sub-ng/g dw to low ng/g dw. The highest concentration of 25 ng/g dw was found for octocrylene (OC) in the Laizhou Bay. In...

  5. Heavy mineral analysis and detrital U-Pb ages of the intracontinental Paleo-Yangzte basin, eastern margin of Tibetan Plateau

    Deng, Bin; Chew, David; Jiang, Lei; Mark, Chris; Cogn, Nathan; Wang, Zijian; Liu, Shugen
    The Paleo-Yangtze basin connected the Sichuan, Xichang and Chuxiong basins during the Late Mesozoic to Early Cenozoic. The Paleo-Yangtze basin subsequently fragmented later in the Cenozoic which makes it challenging to decipher its provenance shifts and the exhumation of the surrounding hinterlands. 47 Heavy mineral analyses combined with detrital (16 apatite, 8 rutile and 8 zircon) U-Pb dating were employed to elucidate the stratigraphic signatures and exhumation patterns along the eastern margin of the Tibetan Plateau during the Upper Cretaceous to Paleogene. Two key horizons have been identified across these basins based on their detrital mineralogy: a garnet-rich horizon within...

  6. 1.5 Ekman model response to the extratropical thermal forcing

    Shin, Yechul; Kang, Sarah
    We examine how the Ekman transport modulates the tropical response to hemispherically differential thermal forcing. The 1.5 layer ocean model is implemented to a gray atmospheric model, with no radiative feedbacks, coupled to an aquaplanet slab ocean. The control climate with no surface flux adjustment is perturbed by southern hemisphere cooling and northern hemisphere warming at the surface. We examine the sensitivity to the forcing amplitude, forcing location, and Ekman flux strength in the control climate. The tropics-to-midlatitude component of Ekman transport, which is a negative feedback that counteracts the prescribed forcing, dominates over the equatorial component, which is a...

  7. Carbon:Chlorophyll ratios of Subarctic Pacific surface waters

    Burt, William J; Westberry, Toby K; Behrenfeld, Michael J; Zeng, Chen; Izett, Robert; Tortell, Philippe Daniel
    We present optically-derived estimates of phytoplankton carbon (Cphyto) and chlorophyll a concentration (Chl) across a wide range of productivity and hydrographic regimes in the Subarctic Pacific Ocean. Our high-frequency measurements capture changes in Cphyto and Chl across regional gradients in macro- and micronutrient limitation, and sub-mesoscale hydrographic frontal zones. Throughout the majority of our survey region, carbon to chlorophyll ratios (Cphyto:Chl) ranged between 50-100. Lower values (10-20) were constrained to the highly productive coastal upwelling system along Vancouver Island, whereas higher estimated values (>200) were found directly off the southern British Columbia continental shelf. Further offshore, Cphyto:Chl was less variable,...

  8. 1,220 Single Nucleotide Polymorphisms (SNPs) of the invasive lionfish across the Northwestern Atlantic and the Gulf of Mexico

    Pérez-Portela, Rocío; Bumford, Alexandra; Coffman, Brian; Wedelich, Shelby; Davenport, Megan; Fogg, Alex; Swenarton, Mary Kate; Coleman, Felicia; Johnston, Michelle A; Crawford, Douglas L; Oleksiak, Marjorie F
    1,220 Single Nucleotide Polymorphisms (SNPs) of the invasive lionfish across the Northwestern Atlantic and the Gulf of Mexico. The zip file below contains the dataset in different formats: 1. "Lionfish_1220_SNPs_162_taxa.gen". A text file in genepop format, including 162 taxa and 1220 SNPs. 2. "Lionfish_1220_SNPs_162_taxa.vcf". A text file in vcf format, including 162 taxa and 1220 SNPs. 3. "Lionfish_1220_162_taxa_coverage.hmc.txt". A text file including the coverage information of 1220 SNPs for 163 taxa.

  9. (Table S2) Numbers and carapace widths of C. maenas and H. sanguineus sampled around Helgoland.

    Jungblut, Simon; Beermann, Jan; Boos, Karin; Saborowski, Reinhard; Hagen, Wilhelm
    The Asian shore crab Hemigrapsus sanguineus (De Haan, 1853) has recently established populations in the North Sea and now occurs within the native ranges of the green crab Carcinus maenas (Linnaeus, 1758). To determine potential competitive effects and to assess the progress of the invasion, species-specific population characteristics (numerical abundances, biomasses, and size distributions) of the two species around the island of Helgoland (German Bight, southern North Sea) were compared for surveys conducted in 2009 and 2014. Sampling sites were chosen based on accessibility and differed in their topography and wave exposure, which allowed testing for the influence of these...

  10. Velocity data for two tidewater glacier surges in Svalbard, 2012-2015

    Benn, Douglas I; Luckman, Adrian; Sevestre, Heidi
    A time-series of velocity data spanning recent surges of two tidewater glaciers in Svalbard: Aavatsmarkbreen (Dec 2012-Oct 2015) and Wahlenbergbreen (Sept 2013-Oct 2015). The data were obtained by feature tracking using pairs of TerraSAR-X backscatter intensity images, typically at 11 day intervals. The GeoTiff files are spatially filtered maps of surface speed. Filenames reveal satellite beams (strips) as well as dates and times.

  11. Water stable isotope record of ice core WAIS divide

    Steig, Eric J; Ding, Quinghua; White, James W C; Küttel, Meinrad; Rupper, Summer B; Neumann, T A; Neff, Peter D; Gallant, Ailie J E; Mayewski, Paul A; Taylor, Kendrick C; Hoffmann, Georg; Dixon, Daniel A; Schoenemann, Spruce W; Markle, Bradley R; Fudge, Tyler J; Schneider, David P; Schauer, Andrew J; Teel, Rebecca P; Vaughn, Bruce H; Burgener, Landon; Williams, Jessica; Korotkikh, Elena; Gkinis, Vasileios
    Changes in atmospheric circulation over the past five decades have enhanced the wind-driven inflow of warm ocean water onto the Antarctic continental shelf, where it melts ice shelves from below. Atmospheric circulation changes have also caused rapid warming over the West Antarctic Ice Sheet, and contributed to declining sea-ice cover in the adjacent Amundsen-Bellingshausen seas. It is unknown whether these changes are part of a longer-term trend. Here, we use water-isotope (d18O) data from an array of ice-core records to place recent West Antarctic climate changes in the context of the past two millennia. We find that the d18O of...

  12. Water stable isotope record of ice cores NGRIP I and II

    Gkinis, Vasileios; Simonsen, Sebastian B; Buchardt, Susanne L; White, James W C; Vinther, Bo M
    A high resolution (0.05 m) water isotopic record (d18O) is available from the NorthGRIP ice core. In this study we look into the water isotope diffusion history as estimated by the spectral characteristics of the d18O time series covering the last 16,000 years. The diffusion of water vapor in the porous medium of the firn pack attenuates the initial isotopic signal, predominantly having an impact on the high frequency components of the power spectrum. Higher temperatures induce higher rates of smoothing and thus the signal can be used as a firn paleothermometer. We use a water isotope diffusion model coupled...

  13. Water stable isotope record of ice core NEEM (early Holocene) measured discretely

    Gkinis, Vasileios; Popp, Trevor; Blunier, Thomas; Bigler, Matthias; Schüpbach, Simon; Kettner, E; Johnsen, Sigfus J
    A new technique for on-line high resolution isotopic analysis of liquid water, tailored for ice core studies is presented. We built an interface between a Wavelength Scanned Cavity Ring Down Spectrometer (WS-CRDS) purchased from Picarro Inc. and a Continuous Flow Analysis (CFA) system. The system offers the possibility to perform simultaneuous water isotopic analysis of d18O and dD on a continuous stream of liquid water as generated from a continuously melted ice rod. Injection of sub µl amounts of liquid water is achieved by pumping sample through a fused silica capillary and instantaneously vaporizing it with 100% efficiency in a~home...

  14. Water stable isotope record of ice core NEEM (early Holocene) measured with Continuous Flow Analysis

    Gkinis, Vasileios; Popp, Trevor; Blunier, Thomas; Bigler, Matthias; Schüpbach, Simon; Kettner, E; Johnsen, Sigfus J
    A new technique for on-line high resolution isotopic analysis of liquid water, tailored for ice core studies is presented. We built an interface between a Wavelength Scanned Cavity Ring Down Spectrometer (WS-CRDS) purchased from Picarro Inc. and a Continuous Flow Analysis (CFA) system. The system offers the possibility to perform simultaneuous water isotopic analysis of d18O and dD on a continuous stream of liquid water as generated from a continuously melted ice rod. Injection of sub µl amounts of liquid water is achieved by pumping sample through a fused silica capillary and instantaneously vaporizing it with 100% efficiency in a~home...

  15. Water stable isotope record of ice core Dome Fuji

    Svensson, Anders M; Fujita, Shuji; Bigler, Matthias; Braun, M; Dallmayr, R; Gkinis, Vasileios; Goto-Azuma, Kumiko; Hirabayashi, Motohiro; Kawamura, K; Kipfstuhl, Sepp; Kjær, Helle A; Popp, Trevor; Simonsen, Marius; Steffensen, Jørgen Peder; Vallelonga, Paul T; Vinther, Bo M
    Whereas ice cores from high-accumulation sites in coastal Antarctica clearly demonstrate annual layering, it is debated whether a seasonal signal is also preserved in ice cores from lower-accumulation sites further inland and particularly on the East Antarctic Plateau. In this study, we examine 5 m of early Holocene ice from the Dome Fuji (DF) ice core at a high temporal resolution by continuous flow analysis. The ice was continuously analysed for concentrations of dust, sodium, ammonium, liquid conductivity, and water isotopic composition. Furthermore, a dielectric profiling was performed on the solid ice. In most of the analysed ice, the multi-parameter...

  16. Stable isotope records of Arctic and Antarctic ice cores

    Gkinis, Vasileios; Holme, Christian T; Vinther, Bo M
    Polar precipitation archived in ice caps contains information on past temperature conditions. Such information can be retrieved by measuring the water isotopic signals of ?18O and ?D in ice cores. These signals have been attenuated during densification due to molecular diffusion in the firn column, where the magnitude of the diffusion is isotopologoue specific and temperature dependent. By utilizing the differential diffusion signal, dual isotope measurements of d18O and dD enable multiple temperature reconstruction techniques. This study assesses how well six different methods can be used to reconstruct past surface temperatures from the diffusion-based temperature proxies. Two of the methods...

  17. The Role of Tectonic Stress in Triggering Large Silicic Caldera Eruptions

    Cabaniss, Haley E; Gregg, Patricia M; Grosfils, Eric B
    Data presented are the results of numerical experiments to address the affect of tectonic stress on the mechanics of triggering caldera-forming volcanic eruptions.

  18. Carbon, carbon isotope and dinoflagellate and pollen of the Latrobe-1 and Point Margaret, Victoria, Australia

    Frieling, Joost; Huurdeman, Emiel P; Rem, Charlotte C M; Donders, Timme H; Pross, Jörg; Bohaty, Steven M; Holdgate, Guy R; Gallagher, Stephen J; McGowran, Brian; Bijl, Peter K
    Detailed, stratigraphically well-constrained environmental reconstructions are available for Paleocene and Eocene strata at a range of sites in the southwest Pacific Ocean (New Zealand and East Tasman Plateau; ETP) and Integrated Ocean Discovery Program (IODP) Site U1356 in the south of the Australo-Antarctic Gulf (AAG). These reconstructions have revealed a large discrepancy between temperature proxy data and climate models in this region, suggesting a crucial error in model, proxy data or both. To resolve the origin of this discrepancy, detailed reconstructions are needed from both sides of the Tasmanian Gateway. Paleocene-Eocene sedimentary archives from the west of the Tasmanian Gateway...

  19. Surface elevation changes near Barrow (Alaska) measured using reflected GPS signals

    Liu, Lin; Larson, Kristine M
    We use reflected GPS signals to measure temporal changes of ground surface elevation due to dynamics of the active layer and near-surface permafrost. Applying the GPS interferometric reflectometry technique to the multipath signal-to-noise ratio data collected by a continuously-operating GPS receiver mounted deep in permafrost in Barrow, Alaska, we can retrieve the vertical distance between the antenna and reflecting surface. Using this unique kind of observables, we obtain daily changes of surface elevation during July and August from 2004 to 2015. Our results show distinct temporal variations at three timescales: regular thaw settlement within each summer, strong inter-annual variability that...

  20. Ballasting effects of Saharan dust on the aggregate dynamics in the upwelling region off Cape Blanc (Mauritania)

    van der Jagt, Helga; Friese, Carmen A; Stuut, Jan-Berend W; Fischer, Gerhard; Iversen, Morten Hvitfeldt
    Lithogenic material such as Saharan dust can be incorporated into organic aggregates and act as ballast, potentially enhancing the marine carbon export via increased sinking velocities of aggregates. We studied the ballasting effects of Saharan dust on the aggregate dynamics in the upwelling region off Cape Blanc (Mauritania). Aggregate formation from a natural plankton community exposed to Saharan dust deposition resulted in higher abundance of aggregates with higher sinking velocities compared to aggregate formation with low dust. This higher aggregate abundance and sinking velocities potentially increased the carbon export 10-fold when the aggregates were ballasted by Saharan dust. After aggregate...

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