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PANGAEA tech-keyword 'featured' (6 data sets)

Mostrando recursos 1 - 20 de 134

  1. Core-top radiolarian abundances and environmental data from the western Pacific, East China Sea and South China Sea

    Hernández-Almeida, Iván; Cortese, Giuseppe; Yu, Pai-Sen; Chen, Min-Te; Kucera, Michal
    Radiolarians are a very diverse microzooplanktonic group, often distributed in regionally restricted assemblages and responding to specific environmental factors. These properties of radiolarian assemblages make the group more conducive for the development and application of basin-wide ecological models. Here we use a new surface sediment data set from the western Pacific to demonstrate that ecological patterns derived from basin-wide open-ocean data sets cannot be transferred on semirestricted marginal seas. The data set consists of 160 surface sediment samples from three tropical-subtropical regions (East China Sea, South China Sea, and western Pacific), combining 54 new assemblage counts with taxonomically harmonized data...

  2. 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...

  3. Branched GDGTs in the Tagus River drainage basin and its outflow into the Atlantic Ocean

    Warden, Lisa; Kim, Jung-Hyun; Zell, Claudia; Vis, Geert-Jan; de Stigter, Henko; Bonnin, Jerome; Sinninghe Damsté, Jaap S
    The distributions of branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are transported from the soils where they are predominantly produced to marine sediments via rivers, have been applied in reconstructing mean annual air temperature (MAT) and pH of soils. However, paleoclimate reconstructions using sedimentary brGDGTs have proven difficult in arid regions, including the Iberian Peninsula. Recently, six novel 6-methyl brGDGTs have been described using new analytical methods (in addition to the nine 5-methyl brGDGTs previously used for climate reconstructions), and so new pH and MAT calibrations have been developed that were shown to improve the accuracy of reconstructions in a...

  4. Stable carbon isotope record of Lake Challa

    Sinninghe Damsté, Jaap S; Verschuren, Dirk; Ossebaar, Jort; Blokker, Jord; van Houten, Rianne; van der Meer, Marcel T J; Plessen, Birgit; Schouten, Stefan
    The debate of climate versus CO2 in controlling the long-term dynamics of tropical African vegetation has focused on events at the upper tree-line, since the relevant paleodata tend to be from mid-elevation sites (~2000-3000 m). Less well known is the relative importance of CO2 in regulating the dynamics of tropical lowland (<1500 m) vegetation, particularly that of the dry open woodlands, bush- and grasslands covering much of eastern equatorial Africa. Here we examine the stable carbon isotopic composition of n-alkanes in the sediment record of Lake Challa, a lowland crater lake near Mt. Kilimanjaro, covering the last 25,000 years. The...

  5. Marine Litter quantities on six Beaches of northern Svalbard in 2016 determined by citizen scientists

    Bergmann, Melanie; Gutow, Lars
    Beaches on remote Arctic islands may be sinks for marine litter and reflect pollution levels of the surrounding waters particularly well. We provide the first quantitative data from surveys carried out by citizen scientists on six beaches of northern Svalbard. Litter quantities recorded by cruise tourists varied from 9-524 g m-2 and were similar to those from densely populated areas. Plastics accounted for >80% of the overall litter, most of which originated from fisheries. Our study highlights the potential of citizen scientists to provide scientifically valuable data on the pollution of sensitive remote ecosystems. The results stress once more that...

  6. Wave models for Eleuthera, Northern Bahamas

    Rovere, Alessio; Casella, Elisa; Harris, Daniel L; Lorscheid, Thomas; Nandasena, Napayalage A K; Dyer, Blake; Sandstrom, Michael R; Stocchi, Paolo; D'Andrea, William J; Raymo, Maureen E
    As global climate warms and sea level rises, coastal areas will be subject to more frequent extreme flooding and hurricanes. Geologic evidence for extreme coastal storms during past warm periods has the potential to provide fundamental insights into their future intensity. Recent studies argue that during the Last Interglacial (MIS 5e, ~128-116 ka) tropical and extratropical North Atlantic cyclones may have been more intense than at present, and may have produced waves larger than those observed historically. Such strong swells are inferred to have created a number of geologic features that can be observed today along the coastlines of Bermuda...

  7. Roosevelt Island Climate Evolution (RICE) ice core isotope record

    Bertler, Nancy A; Conway, Howard; Dahl-Jensen, Dorthe; Emanuelsson, Urban; Winstrup, Mai; Vallelonga, Paul T; Lee, James E; Brook, Edward J; Severinghaus, Jeffrey P; Fudge, Tyler J; Keller, Elizabeth D; Baisden, W Troy; Hindmarsh, Richard C A; Neff, Peter D; Blunier, Thomas; Edwards, Ross L; Mayewski, Paul A; Kipfstuhl, Sepp; Buizert, Christo; Canessa, Silvia; Dadic, Ruzica; Kjær, Helle A; Kurbatov, Andrei; Zhang, Dongqi; Waddington, Edwin D; Baccolo, Giovanni; Beers, Thomas; Brightley, Hannah J; Carter, Lionel; Clemens-Sewall, David; Ciobanu, Viorela G; Delmonte, Barbara; Eling, Lukas; Ellis, Aja A; Ganesh, Shruthi; Golledge, Nicholas R; Haines, Skylar A; Handley, Michael; Hawley, Robert L; Hogan, Chad M; Johnson, Katelyn M; Korotkikh, Elena; Lowry, Daniel P; Mandeno, Darcy; McKay, Robert M; Menking, James A; Naish, Timothy R; Noerling, Caroline; Ollive, Agathe; Orsi, Anais J; Proemse, Bernadette C; Pyne, Alexander R; Pyne, Rebecca L; Renwick, James; Scherer, Reed P; Semper, Stefanie; Simonsen, Marius; Sneed, Sharon B; Steig, Eric J; Tuohy, Andrea; Ulayottil Venugopal, Abhijith; Valero-Delgado, Fernando; Venkatesh, Janani; Wang, Feitang; Wang, Shimeng; Winski, Dominic A; Winton, Victoria H L; Whiteford, Arran; Xiao, Cunde; Yang, Jiao; Zhang, Xin
    High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of climate patterns relevant for future projections. Here, we present data from a new, annually-dated ice core record from the eastern Ross Sea. Comparison of the Roosevelt Island Climate Evolution (RICE) ice core records with climate reanalysis data for the 1979-2012 calibration period shows that RICE records reliably capture temperature and snow precipitation variability of the region. RICE is compared with data from West Antarctica (West Antarctic Ice Sheet Divide Ice Core) and the western (Talos Dome) and eastern (Siple Dome) Ross Sea. For most of the past...

  8. Neodymium isotopic composition of mixed planktonic foraminifera species and epsilon-Nd of scleractinian cold-water corals

    Dubois-Dauphin, Quentin; Montagna, Paolo; Siani, Giuseppe; Douville, Eric; Wienberg, Claudia; Hebbeln, Dierk; Liu, Zhifei; Kallel, Nejib; Dapoigny, Arnaud; Revel, Marie; Pons-Branchu, Edwige; Taviani, Marco; Colin, Christophe
    We present the neodymium isotopic composition (epsilon-Nd) of mixed planktonic foraminifera species from a sediment core collected at 622 m water depth in the Balearic Sea, as well as epsilon-Nd of scleractinian cold-water corals (CWC; Madrepora oculata, Lophelia pertusa) retrieved between 280 and 442 m water depth in the Alboran Sea and at 414 m depth in the southern Sardinian continental margin. The aim is to constrain hydrological variations at intermediate depths in the western Mediterranean Sea during the last 20 kyr. Planktonic (Globigerina bulloides) and benthic (Cibicidoides pachyderma) foraminifera from the Balearic Sea were also analyzed for stable oxygen...

  9. Plant macrofossil records from permafrost deposits of the Bykovsky Peninsula (NE Siberia)

    Kienast, Frank; Schirrmeister, Lutz; Siegert, Christine; Tarasov, Pavel E
    Plant macrofossils from the Mamontovy Khayata permafrost sequence on the Bykovsky Peninsula reflect climate and plant biodiversity in west Beringia during the last cold stage. 14C dates suggest sediment accumulation between about 60,000 and 7500 14C yr B.P. The plant remains prove that during the last cold-stage arctic species coexisted with aquatic, littoral, meadow and steppe taxa. The reconstructed vegetation composition is similar to modern vegetation mosaics in central and northeast Yakutian relict steppe areas. Thus, productive meadow and steppe communities played an important role in the Siberian Arctic vegetation during the late Pleistocene and could have served as food...

  10. (Table 1) SPM samples and sites along the Rhône Rive

    Kim, Jung-Hyun; Buscail, Rosalyne; Fanget, Anne-Sophie; Eyrolle-Boyer, Frédérique; Bassetti, Maria Angela; Dorhout, Denise J C; Baas, Marianne; Berné, Serge; Sinninghe Damsté, Jaap S
    We tested the applicability of the BIT (branched and isoprenoid tetraether) index as a proxy for palaeoflood events in the river-dominated continental margin of the Gulf of Lions (NW Mediterranean). We compared the concentrations of branched glycerol dialkyl glycerol tetraethers (br GDGTs) and crenarchaeol in suspended particulate matter (SPM) collected downstream in the Rhône River, as well as in surface sediments and a ca. 8m piston core from the Rhône prodelta. The core covered the last 400 yr, with four distinct intervals recording the river influence under natural and man-induced shifts in four main channels of the river mouth (Bras...

  11. Hydroclimate proxy data from the eastern tropical Indian Ocean

    Mohtadi, Mahyar; Prange, Matthias; Schefuß, Enno; Jennerjahn, Tim C
    Mg/Ca-based SST and thermocline temperatures with 1Sigma error at different sites, their difference (DeltaT), and the average DeltaT values for different periods with 95% confidence interval (CI). Also shown are hydrogen isotope (dD) values of n-C31 alkanes relative to the standard mean ocean water (per mil SMOW) with the 95% CI (LGM values are corrected for ice-volume), the C31 n-alkane concentrations in nanogram per gram sediment (ng g-1), the Carbon Preference Index (CPI27-33) as a measure of the degree of terrestrial organic matter degradation (higher CPI reflects less degraded plant waxes and vice versa), and their 1Sigma standard deviations (SD).

  12. Georeferenced photographs of benthic photoquadrats acquired along 160 transects distributed over 23 reefs in the Cairns to Cooktown region of the Great Barrier Reef, January and April/May, 2017

    Roelfsema, Christiaan M; Kovacs, Eva M; Phinn, Stuart R
    Underwater georeferenced photo-transect surveys were conducted at different locations: in the shallow waters of the Reef Flat (0.5-2.5m) by a snorkeller, or, along a 5m depth contour of the Reef Slope by a diver. For these surveys, the snorkellers or divers traversed a pre-determined transect 250-1000 m in length, while taking photos of the benthos at a set height using a standard digital camera and towing a surface float GPS which was logging its track every five seconds. The camera lens provided a 1.0 m x 1.0 m footprint, at 0.5 m height above the benthos. Horizontal distance between photoquadrats...

  13. Branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin

    Zell, Claudia; Kim, Jung-Hyun; Balsinha, M; Dorhout, Denise J C; Fernandes, C; Baas, Marianne; Sinninghe Damsté, Jaap S
    Branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are thought to be transported from soil to marine sediment by rivers, have been used to reconstruct the mean annual air temperature (MAAT) and soil pH of the drainage basin using the methylation index of branched tetraethers (MBT, recently refined as MBT') and cyclization index of branched tetraethers (CBT) from coastal marine sediment records. In this study we are tracing the brGDGTs from source to sink in the Tagus River basin, the longest river system on the Iberian Peninsula, by determining their concentration and distribution in soils, river suspended particulate matter (SPM), riverbank...

  14. The Paleocene-Eocene thermal maximum (PETM) stable isotopic values of planktonic and benthic foraminifera at Millville, NJ

    Makarova, Maria; Wright, James D; Miller, Kenneth G; Babila, Tali L; Rosenthal, Yair; Park, Jill I
    We present new d13C and d18O records of surface (Morozovella and Acarinina) and thermocline dwelling (Subbotina) planktonic foraminifera and benthic foraminifera (Gavelinella, Cibicidoides, and Anomalinoides) during the Paleocene-Eocene Thermal Maximum (PETM) from Millville, New Jersey, and compare them with three other sites located along a paleoshelf transect from the U.S. mid-Atlantic coastal plain. Our analyses show different isotopic responses during the PETM in surface versus thermocline and benthic species. Whereas all taxa record a 3.6-4.0 per mil d13C decrease associated with the carbon isotope excursion, thermocline dwellers and benthic foraminifera show larger d18O decreases compared to surface dwellers. We consider...

  15. Mercury concentration and isotopic compositions in lake waters and lake sediment from Canada and China

    Chen, Jiubin; Hintelmann, Holger; Zheng, Wang; Feng, Xinbin; Cai, Hongming; Wang, Zhuhong; Yuan, Shengliu; Wang, Zhongwei
    Lakes are important ecosystems where mercury (Hg) may undergo extensive methylation and bioaccumulation in the aquatic food web. It is thus crucial to understand the sources of Hg in lake systems. Mercury isotope composition is a powerful tracer of its sources in the environment. However, previous studies on Hg isotope compositions in lake systems mainly focus on the aquatic organism and sediments, whereas lake water that provides the nutrients for the bottom of aquatic food chain has received much less attention. Here we report Hg isotope compositions in surface water and sediments of 8 freshwater lakes in Ontario, Canada. We...

  16. Oligocene stable isotope record and calcareous nannofossils of IODP Site 208-1264

    Liebrand, Diederik; Raffi, Isabella; Fraguas, Ángela; Laxenaire, Rémi; Bosmans, Joyce H C; Hilgen, Frederik J; Wilson, Paul A; Batenburg, Sietske J; Beddow, Helen M; Bohaty, Steven M; Bown, Paul R; Crocker, Anya J; Huck, Claire E; Lourens, Lucas Joost; Sabia, Luciana
    Pelagic sediments from the subtropical South Atlantic Ocean contain geographically extensive Oligocene ooze and chalk layers that consist almost entirely of the calcareous nannofossil Braarudosphaera. Poor recovery and the lack of precise dating of these horizons in previous studies has limited our understanding of the exact number of acmes, their timing and durations, and the causes of their recurrence. Here we present a high-resolution, astronomically tuned stratigraphy of Braarudosphaera oozes (29.5-27.9 Ma) from Ocean Drilling Program Site 1264 in the subtropical southeastern Atlantic Ocean. We identify seven acme events in the Braarudosphaera abundance record. The longest lasting acme event corresponds...

  17. Stable isotopes (d13C, d18O) on elevated epifauna from the Pliocene and Holocene

    García-Gallardo, Ángela; Grunert, Patrick; Voelker, Antje H L; Mendes, Isabel; Piller, Werner E
    The presence and high abundances of the benthic foraminiferal group "elevated epifauna" has been proposed as indicator of the existence of Mediterranean Outflow Water (MOW) in the Gulf of Cadiz. Here we intend to use this potential proxy to reconstruct MOW in the early Pliocene at the Integrated Ocean Drilling Program (IODP) Hole U1387C. Cibicides lobatulus, Planulina ariminensis and Cibicides refulgens were found at this site, but high abundances of C. lobatulus and C. refulgens coincide with increases of shelf taxa and grain size, related to episodes of downslope transport. This issue calls into question the applicability of these species...

  18. Collection of environmental data, soil water content, root water uptake, evapotranspiration, plant trait and root trait data of the Jena-Ecotron experiment

    Guderle, Marcus; Bachmann, Dörte; Milcu, Alexandru; Gockele, Annette; Bechmann, Marcel; Fischer, Christine; Roscher, Christiane; Landais, Damien; Ravel, Olivier; Devidal, Sébastien; Roy, Jacques; Gessler, Arthur; Buchmann, Nina; Weigelt, Alexandra; Hildebrandt, Anke
    This data set contains environmental variables (imposed cumulative precipitation, measurements of radiation, air relative humidity and air temperature), measurements of soil water content, root water uptake estimated from soil moisture contents and community evapotranspiration derived from root water uptake as well as from weight changes, plant trait data (specific leaf area, leaf dry matter content, leaf water potential measured at predawn and midday, stomatal conductance, leaf greenness, height of species, aboveground biomass, species abundances, community leaf area index, vegetation and soil surface cover) and root trait data (biomass, length, diameter, surface area, tips, forks and crossings) from the 12 macrocosms...

  19. Fluxes and 13C/12C ratios of reactive gas emissions from EMAC EVAL2 set-up, link to files in NetCDF format

    Gromov, Sergey; Brenninkemeijer, Carl A M; Jöckel, Patrick
    We provide the estimate of the fluxes and 13C/12C ratios of a suite of reactive carbonaceous compounds emitted into the atmosphere. The data are based on an evaluated set-up of the EMAC model (EVAL2, doi:10.5194/gmd-3-717-2010). Please refer to the cited publication for details. Emission sources are integrated into the anthropogenic (ANT), biogenic (BIO) and biomass burning (BB) categories. On-line calculated emissions (e.g. C5H8) and pseudo-emission (nudging) data are not included. The ANT and BIO emissions refer to the year 2000, the BB emissions span the 1997-2005 period. Data for each category is encapsulated in a separate NetCDF file (ver. 4).

  20. Deriving Canada-wide soils dataset for use in Soil and Water Assessment Tool (SWAT)

    Cordeiro, Marcos R C; Lelyk, Glenn; Kröbel, Roland; Legesse, Getahun; Faramarzi, Monireh; Masud, Mohammad Badrul; McAllister, Tim
    The objective of this work was to pre-process the Soil Landscapes of Canada (SLC) database to offer a country-level soils dataset in a format ready to be used in SWAT simulations. A two-level screening process was used to identify critical information required by SWAT and to remove records with information that could not be calculated or estimated. Out of the 14,063 unique soils in the SLC, 11,838 soils with complete information were included in the dataset presented here. Soils with missing records for the required SWAT variables were removed from the analysis. These soils were compiled into a soils list...

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