453 Works

Carbon pools and fluxes measured during a field campaign conducted in 2010 on the Tibetan Plateau at Kema, supplement to: Ingrisch, Johannes; Biermann, Tobias; Seeber, Elke; Leipold, Thomas; Li, Maoshan; Ma, Yaoming; Xu, Xingliang; Miehe, Georg; Guggenberger, Georg; Foken, Thomas; Kuzyakov, Yakov (2015): Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and 13CO2 pulse labeling. Science of the Total Environment, 505, 1213-1224

Johannes Ingrisch, Tobias Biermann, Elke Seeber, Thomas Leipold, Maoshan Li, Yaoming Ma, Xingliang Xu, Georg Miehe, Georg Guggenberger, Thomas Foken & Yakov Kuzyakov
The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements...

Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic, supplement to: Riedinger, Natascha; Formolo, Michael J; Lyons, Timothy W; Henkel, Susann; Beck, Antje; Kasten, Sabine (2014): An inorganic geochemical argument for coupled anaerobic oxidation of methane and iron reduction in marine sediments. Geobiology, 12(2), 172-181

Natascha Riedinger, Michael J Formolo, Timothy W Lyons, Susann Henkel, Antje Beck & Sabine Kasten
Here, we present results from sediments collected in the Argentine Basin, a non-steady state depositional marine system characterized by abundant oxidized iron within methane-rich layers due to sediment reworking followed by rapid deposition. Our comprehensive inorganic data set shows that iron reduction in these sulfate and sulfide-depleted sediments is best explained by a microbially mediated process-implicating anaerobic oxidation of methane coupled to iron reduction (Fe-AOM) as the most likely major mechanism. Although important in many...

Distribution of marine litter at bathyal and abyssal depths in the Mediterranean Sea, supplement to: Ramirez-Llodra, Eva; De Mol, Ben; Company, M; Coll, Marta; Sardà, Francesc (2013): Effects of natural and anthropogenic processes in the distribution of marine litter in the deep Mediterranean Sea. Progress in Oceanography, 118, 273-287

Eva Ramirez-Llodra, Ben De Mol, M Company, Marta Coll & Francesc Sardà
The distribution, type and quantity of marine litter accumulated on the bathyal and abyssal Mediterranean seafloor has been studied in the framework of the Spanish national projects PROMETEO and DOS MARES and the ESF-EuroDEEP project BIOFUN. Litter was collected with an otter trawl and Agassiz trawl while sampling for megafauna on the Blanes canyon and adjacent slope (Catalan margin, north-western Mediterranean) between 900 and 2700 m depth, and on the western, central and eastern Mediterranean...

Measurements of trace metal abundances and isotopes in carbonate sediments, Exuma, Bahamas, supplement to: Romaniello, Stephen J; Herrmann, Achim D; Anbar, Ariel D (2013): Uranium concentrations and 238U/235U isotope ratios in modern carbonates from the Bahamas: Assessing a novel paleoredox proxy. Chemical Geology, 362, 305-316

Stephen J Romaniello, Achim D Herrmann & Ariel D Anbar
In order to validate the use of 238U/235U as a paleoredox proxy in carbonates, we examined the incorporation and early diagenetic evolution of U isotopes in shallow Bahamian carbonate sediments. Our sample set consists of a variety of primary precipitates that represent a range of carbonate producing organisms and components that were important in the past (scleractinian corals, calcareous green and red algae, ooids, and mollusks). In addition, four short push cores were taken in...

Comparison of Ba/Ca and δ¹⁸OWATER as freshwater proxies: a multi-species core-top study on planktonic foraminifera from the vicinity of the Orinoco River mouth, supplement to: Bahr, André; Schönfeld, Joachim; Hoffmann, Julia; Voigt, Silke; Aurahs, Ralf; Kucera, Michal; Flögel, Sascha; Jentzen, Anna; Gerdes, Axel (2013): Comparison of Ba/Ca and d18Owater as freshwater proxies: A multi-species core-top study on planktonic foraminifera from the vicinity of the Orinoco River mouth. Earth and Planetary Science Letters, 383, 45-57

André Bahr, Joachim Schönfeld, Julia Hoffmann, Silke Voigt, Ralf Aurahs, Michal Kucera, Sascha Flögel, Anna Jentzen & Axel Gerdes
Past river run-off is an important measure for the continental hydrological cycle and the as-sessment of freshwater input into the ocean. However, paleosalinity reconstructions applying different proxies in parallel often show offsets between the respective methods. Here, we compare the established foraminiferal Ba/Ca and d18OWATER salinity proxies for their capability to record the highly seasonal Orinoco freshwater plume in the eastern Caribbean. For this purpose we obtained a data set comprising Ba/Ca and d18OWATER determined...

Hydraulic conductivity and experiments of sediment beds, supplement to: Bartzke, Gerhard; Bryan, Karin R; Pilditch, Conrad A; Huhn, Katrin (2013): On the stabilizing influence of silt on sand beds. Journal of Sedimentary Research, 83(8), 691-703

Gerhard Bartzke, Karin R Bryan, Conrad A Pilditch & Katrin Huhn
In marine environments, sediments from different sources are stirred and dispersed, generating beds that are composed of mixed and layered sediments of differing grain sizes. Traditional engineering formulations used to predict erosion thresholds are however, generally for unimodal sediment distributions, and so may be inadequate for commonly occurring coastal sediments. We tested the transport behavior of deposited and mixed sediment beds consisting of a simplified two-grain fraction (silt (D50 = 55 µm) and sand (D50...

Orbitally tuned time scale and astronomical forcing in the middle Eocene to early Oligocene determined on ODP and IODP sediment cores, supplement to: Westerhold, Thomas; Röhl, Ursula; Pälike, Heiko; Wilkens, Roy H; Wilson, Paul A; Acton, Gary D (2014): Orbitally tuned timescale and astronomical forcing in the middle Eocene to early Oligocene. Climate of the Past, 10, 955-973

Thomas Westerhold, Ursula Röhl, Heiko Pälike, Roy H Wilkens, Paul A Wilson & Gary D Acton
Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated. In this study, we construct a robust astronomically calibrated age model for the middle Eocene to early Oligocene interval (31-43 Ma) in order to permit more detailed study of the exceptional climatic events that occurred during this time, including the Middle Eocene Climate Optimum and the Eocene/Oligocene...

Respiration rates and abundances of dominant copepods of the northern Benguela Current System, supplement to: Schukat, Anna; Teuber, Lena; Hagen, Wilhelm; Wasmund, Norbert; Auel, Holger (2013): Energetics and carbon budgets of dominant calanoid copepods in the northern Benguela upwelling system. Journal of Experimental Marine Biology and Ecology, 442, 1-9

Anna Schukat, Lena Teuber, Wilhelm Hagen, Norbert Wasmund & Holger Auel
Respiration rates of 16 calanoid copepod species from the northern Benguela upwelling system were measured on board RRS Discovery in September/October 2010 to determine their energy requirements and assess their significance in the carbon cycle. Individual respiration rates were standardised to a mean copepod body mass and a temperature regime typical of the northern Benguela Current. These adjusted respiration rates revealed two different activity levels (active and resting) in copepodids C5 of Calanoides carinatus and...

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXIII/10

Andreas Macke, Yann Zoll, Andreas Wassmann & Bernhard Pospichal
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXIII/10 from 2007-04-19 to 2007-05-04.

A global historical radiosondes and tracked balloons archive on standard pressure levels back to the 1920s, supplement to: Ramella Pralungo, Lorenzo; Haimberger, Leopold; Stickler, Alexander (2014): A global radiosonde and tracked balloon archive on 16 pressure levels (GRASP) back to 1905 - Part 1: Merging and interpolation to 00:00 and 12:00 GMT. Earth System Science Data, 6(1), 185-200

Lorenzo Ramella Pralungo, Leopold Haimberger, Alexander Stickler & Stefan Brönnimann
The Comprehensive Historical Upper-Air Network (CHUAN version 1.7), which was substantially extended in 2013, and the Integrated Global Radiosonde Archive (IGRA) are the most important collections of upper-air measurements taken before 1958. CHUAN (tracked) balloon data start in 1900, with higher numbers from the late 1920s onward, whereas IGRA data start in 1937. However, a substantial fraction of those measurements have not been taken at synoptic times (preferably 00:00 or 12:00 GMT) and on altitude...

Distribution of biological, anthropogenic, and volcanic constituents in the San Francisco Bay Coastal System, supplement to: McGann, Mary L; Erikson, Li H; Wan, Elmira; Powell, Charles; Maddocks, Rosalie F (2013): Distribution of biologic, anthropogenic, and volcanic constituents as a proxy for sediment transport in the San Francisco Bay Coastal System. Marine Geology, 345, 113-142

Mary L McGann, Li H Erikson, Elmira Wan, Charles Powell & Rosalie F Maddocks
Although conventional sediment parameters (mean grain size, sorting, and skewness) and provenance have typically been used to infer sediment transport pathways, most freshwater, brackish, and marine environments are also characterized by abundant sediment constituents of biological, and possibly anthropogenic and volcanic, origin that can provide additional insight into local sedimentary processes. The biota will be spatially distributed according to its response to environmental parameters such as water temperature, salinity, dissolved oxygen, organic carbon content, grain...

Sr-Nd isotopic analyses of sand-sized sediment from the San Francisco Bay coastal system, supplement to: Rosenbauer, Robert J; Foxgrover, Amy C; Hein, James R; Swarzenski, Peter W (2013): A Sr–Nd isotopic study of sand-sized sediment provenance and transport for the San Francisco Bay coastal system. Marine Geology, 345, 143-153

Robert J Rosenbauer, Amy C Foxgrover, James R Hein & Peter W Swarzenski
A diverse suite of geochemical tracers, including 87Sr/86Sr and 143Nd/144Nd isotope ratios, the rare earth elements (REEs), and select trace elements were used to determine sand-sized sediment provenance and transport pathways within the San Francisco Bay coastal system. This study complements a large interdisciplinary effort (Barnard et al., 2012) that seeks to better understand recent geomorphic change in a highly urbanized and dynamic estuarine-coastal setting. Sand-sized sediment provenance in this geologically complex system is important...

Diatoms and biomarkers in sediments from the Antarctic Peninsula, supplement to: Barbara, Loïc; Crosta, Xavier; Schmidt, Sabine; Massé, Guillaume (2013): Diatoms and biomarkers evidence for major changes in sea ice conditions prior the instrumental period in Antarctic Peninsula. Quaternary Science Reviews, 79, 99-110

Loïc Barbara, Xavier Crosta, Sabine Schmidt & Guillaume Massé
The Antarctic Peninsula (AP) has been identified as one of the most rapidly warming region on Earth. Satellite monitoring currently allows for a detailed understanding of the relationship between sea ice extent and duration and atmospheric and oceanic circulations in this region. However, our knowledge on ocean-ice-atmosphere interactions is still relatively poor for the period extending beyond the last 30 years. Here, we describe environmental conditions in Northwestern and Northeastern Antarctic Peninsula areas over the...

Methane fluxes and carbonate deposits at eastern Mediterranean cold seeps, supplement to: Römer, Miriam; Sahling, Heiko; Pape, Thomas; dos Santos Ferreira, Christian; Wenzhöfer, Frank; Boetius, Antje; Bohrmann, Gerhard (2013): Methane fluxes and carbonate deposits at a cold seep area of the Central Nile Deep Sea Fan, Eastern Mediterranean Sea. Marine Geology, 27-42

Miriam Römer, Heiko Sahling, Thomas Pape, Christian dos Santos Ferreira, Frank Wenzhöfer, Antje Boetius & Gerhard Bohrmann
High acoustic seafloor-backscatter signals characterize hundreds of patches of methane-derived authigenic carbonates and chemosynthetic communities associated with hydrocarbon seepage on the Nile Deep Sea Fan (NDSF) in the Eastern Mediterranean Sea. During a high-resolution ship-based multibeam survey covering a ~ 225 km**2 large seafloor area in the Central Province of the NDSF we identified 163 high-backscatter patches at water depths between 1500 and 1800 m, and investigated the source, composition, turnover, flux and fate of...

Hydrogen isotope data of aquatic and terrestrial lipid biomarkers from Lake Meerfelder Maar during the Younger Dryas, supplement to: Rach, Oliver; Brauer, Achim; Wilkes, Heinz; Sachse, Dirk (2014): Delayed hydrological response to Greenland cooling at the onset of the Younger Dryas in Western Europe. Nature Geoscience, 7, 109-112

Oliver Rach, Achim Brauer, Heinz Wilkes & Dirk Sachse
Here we use compound-specific hydrogen isotope data of aquatic and terrestrial lipid biomarkers from precisely dated annually laminated sediments from Lake Meerfelder Maar (MFM) in Western Germany to reconstruct decadal resolved hydroclimatic changes during the Younger Dryas. We show that cooling at MFM begun synchronous to the onset of cooling in Greenland at 12.850 years BP. Major environmental changes at MFM however took place 170 years later as a result of substantially drier conditions.

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXVI/1

Andreas Macke, Yann Zoll & Bernhard Pospichal
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXVI/1 from 2009-10-19 to 2009-11-24.

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXV/5

Andreas Macke, Yann Zoll & Bernhard Pospichal
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXV/5 from 2009-04-11 to 2009-05-21.

Continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXVI/4

Andreas Macke, Yann Zoll & Bernhard Pospichal
This data collection contains continuous liquid water path (LWP) and integrated water vapour (IWV) measurements during POLARSTERN cruise ANT-XXVI/4 from 2010-04-07 to 2010-05-15.

Spectral colour data (400-700nm) from Monte dei Corvi, near Ancona, Italy, supplement to: Zeeden, Christian; Hilgen, Frederik J; Hüsing, Silja; Lourens, Lucas Joost (2014): The Miocene astronomical time scale 9-12 Ma: New constraints on tidal dissipation and their implications for paleoclimatic investigations. Paleoceanography, 29(4), 296-307

Christian Zeeden, Frederik J Hilgen, Lucas Joost Lourens & Silja Hüsing
Orbital tuning and understanding climate response to astronomical forcing in the Miocene require detailed knowledge of the effect of tidal dissipation (Td) and dynamical ellipticity (dE) on astronomical solutions used to compute insolation and orbital target curves for paleoclimatic studies. These Earth parameters affect precession and obliquity; the determination of their effect is of fundamental importance, as phase relations between astronomical forcing and climate response can only be accurately calculated when the relative phasing between...

Field measurements on Atka Bay landfast sea ice in 2012, supplement to: Hoppmann, Mario; Nicolaus, Marcel; Paul, Stephan; Hunkeler, Priska A; Heinemann, Günther; Willmes, Sascha; Timmermann, Ralph; Boebel, Olaf; Schmidt, Thomas; Kühnel, Meike; König-Langlo, Gert; Gerdes, Rüdiger (2014): Ice platelets below Weddell Sea landfast sea ice. Annals of Glaciology, 56(69)

Mario Hoppmann, Marcel Nicolaus, Stephan Paul, Priska A Hunkeler, Günther Heinemann, Sascha Willmes, Ralph Timmermann, Olaf Boebel, Thomas Schmidt, Meike Kühnel, Gert König-Langlo & Rüdiger Gerdes
Basal melt of ice shelves may lead to an accumulation of disc-shaped ice platelets underneath nearby sea ice, to form a sub-ice platelet layer. Here we present the seasonal cycle of sea ice attached to the Ekström Ice Shelf, Antarctica, and the underlying platelet layer in 2012. Ice platelets emerged from the cavity and interacted with the fast-ice cover of Atka Bay as early as June. Episodic accumulations throughout winter and spring led to an...

A high-resolution record from IODP Site 323-U1440, supplement to: Schlung, Shilo A; Ravelo, Ana Christina; Aiello, Ivano W; Andreasen, Dyke; Cook, Mea S; Drake, Michelle K; Dyez, Kelsey A; Guilderson, Thomas P; LaRiviere, Jonathan P; Stroynowski, Zuzanna N; Takahashi, Kozo (2013): Millennial-scale climate change and intermediate water circulation in the Bering Sea from 90 ka: A high-resolution record from IODP Site U1340. Paleoceanography, 28(1), 54-67

Shilo A Schlung, Ana Christina Ravelo, Ivano W Aiello, Dyke Andreasen, Mea S Cook, Michelle K Drake, Kelsey A Dyez, Thomas P Guilderson, Jonathan P LaRiviere, Zuzanna N Stroynowski & Kozo Takahashi
Millennial-scale climate events in the North Pacific are thought to be related to changes in the circulation of North Pacific Intermediate Water, which may have formed in the Bering Sea in the past. To advance our understanding of the mechanisms that underlie millennial-scale events, Bering Sea sediment cores from the Integrated Ocean Drilling Program site U1340 were used to construct high-resolution, multiproxy climate records of the last 90,000 years. Sediment density records show millennial-scale events...

Investigations on seven sediment cores from the New Ireland Basin, east of Papua New Guinea, supplement to: Horz, Kersten H; Worthington, Tim J; Winn, Kyaw; Stoffers, Peter (2004): Late Quaternary tephra in the New Ireland Basin, Papua New Guinea. Journal of Volcanology and Geothermal Research, 132(1), 73-95

Kersten H Horz, Tim J Worthington, Kyaw Winn & Peter Stoffers
Sediment cores were recovered from the New Ireland Basin, east of Papua New Guinea, in order to investigate the late Quaternary eruptive history of the Tabar-Lihir-Tanga-Feni (TLTF) volcanic chain. Foraminifera d18O profiles were matched to the low-latitude oxygen isotope record to date the cores, which extend back to the early part of d18O Stage 9 (333 ka). Sedimentation rates decrease from >10 cm/1000 yr in cores near New Ireland to ~2 cm/1000 yr further offshore....

Stable carbon isotope record of benthic foraminifera across the Paleocene-Eocene thermal maximum in the New Jersey Coastal Plain, supplement to: Stassen, Peter; Thomas, Ellen; Speijer, Robert P (2012): Integrated stratigraphy of the Paleocene-Eocene thermal maximum in the New Jersey Coastal Plain: Toward understanding the effects of global warming in a shelf environment. Paleoceanography, 27(4), PA4210

Peter Stassen, Ellen Thomas & Robert P Speijer
In the New Jersey Coastal Plain, a silty to clayey sedimentary unit (the Marlboro Formation) represents deposition during the Paleocene-Eocene thermal maximum (PETM). This interval is remarkably different from the glauconitic sands and silts of the underlying Paleocene Vincentown and overlying Eocene Manasquan Formation. We integrate new and published stable isotope, biostratigraphic, lithostratigraphic and ecostratigraphic records, constructing a detailed time frame for the PETM along a depth gradient at core sites Clayton, Wilson Lake, Ancora...

XRF-scanned elemental concentrations from sediment cores off Peru, supplement to: Mollier-Vogel, Elfi; Leduc, Guillaume; Böschen, Tebke; Martinez, Philippe; Schneider, Ralph R (2013): Rainfall response to orbital and millennial forcing in northern Peru over the last 18 ka. Quaternary Science Reviews, 76, 29-38

Elfi Mollier-Vogel, Guillaume Leduc, Tebke Böschen, Philippe Martinez & Ralph R Schneider
We present a high-resolution marine record of sediment input from the Guayas River, Ecuador, that reflects changes in precipitation along western equatorial South America during the last 18ka. We use log (Ti/Ca) derived from X-ray Fluorescence (XRF) to document terrigenous input from riverine runoff that integrates rainfall from the Guayas River catchment. We find that rainfall-induced riverine runoff has increased during the Holocene and decreased during the last deglaciation. Superimposed on those long-term trends, we...

Age determination and stable isotope record of sediment core MR06-04_PC23A, supplement to: Rella, Stephan F; Tada, Ryuji; Nagashima, Kana; Ikehara, Minoru; Itaki, Takuya; Ohkushi, Ken´ichi; Sakamoto, Tatsuhiko; Harada, Naomi; Uchida, Masao (2012): Abrupt changes of intermediate water properties on the northeastern slope of the Bering Sea during the last glacial and deglacial period. Paleoceanography, 27(3), PA3203

Stephan F Rella, Ryuji Tada, Kana Nagashima, Minoru Ikehara, Takuya Itaki, Ken´ichi Ohkushi, Tatsuhiko Sakamoto, Naomi Harada & Masao Uchida
Millennial-scale variability in the behavior of North Pacific Intermediate Water during the last glacial and deglacial period, and its association with Dansgaard-Oeschger (D-O) cycles and Heinrich events, are examined based on benthic foraminiferal oxygen and carbon isotopes (d18Obf and d13Cbf) and %CaCO3 using a sediment core recovered from the northeastern slope of the Bering Sea. A suite of positive d18Obf excursions at intermediate depths of the Bering Sea, which seem at least in part associated...

Registration Year

  • 2014
    453

Resource Types

  • Collection
    453