180,667 Works

Mineralogy, geochemistry and benthic foraminifera of the Gorrondatxe beach section, supplement to: Payros, Aitor; Ortiz, Silvia; Alegret, Laia; Orue-Etxebarria, Xabier; Apellaniz, Estibaliz; Molina, Eustoquio (2012): An early Lutetian carbon-cycle perturbation: Insights from the Gorrondatxe section (western Pyrenees, Bay of Biscay). Paleoceanography, 27(2), PA2213

Aitor Payros, Silvia Ortiz, Laia Alegret, Xabier Orue-Etxebarria, Estibaliz Apellaniz & Eustoquio Molina
A distinctive low-carbonate interval interrupts the continuous limestone-marl alternation of the deep-marine Gorrondatxe section at the early Lutetian (middle Eocene) C21r/C21n Chron transition. The interval is characterized by increased abundance of turbidites and kaolinite, a 3 per mil decline in the bulk d13C record, a >1 per mil decline in benthic foraminiferal d13C followed by a gradual recovery, a distinct deterioration in foraminiferal preservation, high proportions of warm-water planktic foraminifera and opportunistic benthic foraminifera, and...

Age determination and climate change events in ODP Hole 164-1017E, supplement to: Hendy, Ingrid L; Pedersen, Thomas F; Kennett, James P; Tada, Ryuji (2004): Intermittent existence of a southern Californian upwelling cell during submillennial climate change of the last 60 kyr. Paleoceanography, 19(3), PA3007

Ingrid L Hendy, Thomas F Pedersen, James P Kennett & Ryuji Tada
Application of a high-resolution multiproxy approach to a sedimentary section drilled at Ocean Drilling Program Site 1017, located under a highly active upwelling cell off Point Conception, California, provides clear evidence for surface ocean productivity shifts on submillennial timescales during the last 60 kyr. The proxies include bulk-sediment major and minor elements, organic carbon and carbonate concentrations, d15N, and planktonic foraminiferal species assemblage and carbon isotope determinations. The collective results demonstrate that marine productivity in...

Skeletal density of Porites, supplement to: Gagan, Michael K; Dunbar, Gavin B; Suzuki, Atsushi (2012): The effect of skeletal mass accumulation in Porites on coral Sr/Ca and d18O paleothermometry. Paleoceanography, 27(1), PA1203

Michael K Gagan, Gavin B Dunbar & Atsushi Suzuki
Paleotemperature estimates based on coral Sr/Ca have not been widely accepted because the reconstructed glacial-Holocene shift in tropical sea-surface temperature (~4-6°C) is larger than that indicated by foraminiferal Mg/Ca (~2-4°C). We show that corals over-estimate changes in sea-surface temperature (SST) because their records are attenuated during skeletogenesis within the living tissue layer. To quantify this process, we microprofiled skeletal mass accumulation within the tissue layer of Porites from Australasian coral reefs and laboratory culturing experiments....

Lithogenic sediment deposition of 7 sediment cores from the Pacific Southern Ocean, supplement to: Lamy, Frank; Gersonde, Rainer; Winckler, Gisela; Esper, Oliver; Jaeschke, Andrea; Kuhn, Gerhard; Ullermann, Johannes; Martínez‐García, Alfredo; Lambert, Fabrice; Kilian, Rolf (2014): Increased dust deposition in the Pacific Southern Ocean during glacial periods. Science, 343(6169), 403-407

Frank Lamy, Rainer Gersonde, Gisela Winckler, Oliver Esper, Andrea Jaeschke, Gerhard Kuhn, Johannes Ullermann, Alfredo Martínez‐García, Fabrice Lambert & Rolf Kilian
Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar South Pacific, indicating three times higher dust deposition during glacial periods than during interglacials for the past million years. Although the most likely dust source for the South Pacific is Australia and New...

Biogeochemical measurements of cold seep sediments inhabit by vesicomyid clams in the Japan Deep Sea Trench, supplement to: Felden, Janine; Ruff, S Emil; Ertefai, Tobias F; Inagaki, Fumio; Hinrichs, Kai-Uwe; Wenzhöfer, Frank (2014): Anaerobic methanotrophic community of a 5346 m-deep vesicomyid clam colony in the Japan Trench. Geobiology

Janine Felden, S Emil Ruff, Tobias F Ertefai, Fumio Inagaki, Kai-Uwe Hinrichs & Frank Wenzhöfer
Vesicomyidae clams harbor sulfide-oxidizing endosymbionts and are typical members of cold seep communities associated with tectonic faults where active venting of fluids and gases takes place. We investigated the central biogeochemical processes that supported a vesicomyid clam colony as part of a locally restricted seep community in the Japan Trench at 5346 m water depth, one of the deepest seep settings studied to date. An integrated approach of biogeochemical and molecular ecological techniques was used...

Organic carbon and total nitrogen stocks in soils of the Lena River Delta, supplement to: Zubrzycki, Sebastian; Kutzbach, Lars; Grosse, Guido; Desyatkin, Alexey; Pfeiffer, Eva-Maria (2013): Organic carbon and total nitrogen stocks in soils of the Lena River Delta. Biogeosciences, 10(6), 3507-3524

Sebastian Zubrzycki, Lars Kutzbach, Guido Grosse, Alexey Desyatkin & Eva-Maria Pfeiffer
The Lena River Delta, which is the largest delta in the Arctic, extends over an area of 32 000 km**2 and likely holds more than half of the entire soil organic carbon (SOC) mass stored in the seven major deltas in the northern permafrost regions. The geomorphic units of the Lena River Delta which were formed by true deltaic sedimentation processes are a Holocene river terrace and the active floodplains. Their mean SOC stocks for...

Pb isotope and geochemical record of Arctic sediments, supplement to: Maccali, Jenny; Hillaire-Marcel, Claude; Carignan, Jean; Reisberg, Laurie (2012): Pb isotopes and geochemical monitoring of Arctic sedimentary supplies and water mass export through Fram Strait since the Last Glacial Maximum. Paleoceanography, 27(1), PA1201

Jenny Maccali, Claude Hillaire-Marcel, Jean Carignan & Laurie Reisberg
Elemental and Pb isotope measurements were performed on leachates and residues from surface sediments and two <50 cm cores (MC04 and MC16) collected along a NE-SW transect through Fram Strait. Geochemical and isotopic properties of residues from surface sediments define three distinct spatial domains within the Strait: 1) the easternmost edge of the Strait; 2) the eastern part of the Strait off the Svalbard margins; and 3) the western part of the Strait, influenced by...

Siliceous microfossil assemblage and accumulation rate variations across the Middle Eocene Climatic Optimum at ODP Site 171-1051, supplement to: Witkowski, Jakub; Bohaty, Steven M; Edgar, Kirsty M; Harwood, David M (2014): Rapid fluctuations in mid-latitude siliceous plankton production during the Middle Eocene Climatic Optimum (ODP Site 1051, western North Atlantic). Marine Micropaleontology, 106, 110-129

Jakub Witkowski, Steven M Bohaty, Kirsty M Edgar & David M Harwood
The Middle Eocene Climatic Optimum (MECO; ~ 40 million years ago [Ma]) is one of the most prominent transient global warming events in the Paleogene. Although the event is well documented in geochemical and isotopic proxy records at many locations, the marine biotic response to the MECO remains poorly constrained. We present new high-resolution, quantitative records of siliceous microplankton assemblages from the MECO interval of Ocean Drilling Program (ODP) Site 1051 in the subtropical western...

Biological Atlas of the Arctic Seas 2000: Physical oceanography, hydrochemistry, meteorology, and plankton of the Barents and Kara Seas, supplement to: Matishov, Gennady G; Makarevich, Pavel R; Timofeev, Sergey F; Kuznetsov, Leonid L; Druzhkov, Nikolay V; Larionov, Viktor V; Golubev, Valery A; Zuyev, Aleksey N; Denisov, V I; Adrov, Nikolai M; Iliyn, G; Kuznetsov, A; Denisenko, Stanislav G; Savinov, Vladimir M; Shavikyn, A; Smolyar, I; Levitus, Sydney; O'Brien, Todd; Baranova, O (2000): Biological Atlas of the Arctic Seas 2000: Plankton of the Barents and Kara Seas (in english). International Ocean Atlas Series, Murmansk Marine Biological Institute, Russia; Ocean Climate Laboratory, NODC/NOAA, USA, 2, 348 pp

Gennady G Matishov, Pavel R Makarevich, Sergey F Timofeev, Leonid L Kuznetsov, Nikolay V Druzhkov, Viktor V Larionov, Valery A Golubev, Aleksey N Zuyev, V I Denisov, Nikolai M Adrov, G Iliyn, A Kuznetsov, Stanislav G Denisenko, Vladimir M Savinov, A Shavikyn, I Smolyar, Sydney Levitus, Todd O'Brien & O Baranova
Presented are physical and biological data for the region extending from the Barents Sea to the Kara Sea during 158 scientific cruises for the period 1913-1999. Maps with the temporal distribution of physical and biological variables of the Barents and Kara Seas are presented, with proposed quality control criteria for phytoplankton and zooplankton data. Changes in the plankton community structure between the 1930s, 1950s, and 1990s are discussed. Multiple tables of Arctic Seas phytoplankton and...

Measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C, supplement to: Iversen, Morten Hvitfeldt; Ploug, Helle (2013): Temperature effects on carbon-specific respiration rate and sinking velocity of diatom aggregates - potential implications for deep ocean export processes. Biogeosciences, 10(6), 4073-4085

Morten Hvitfeldt Iversen & Helle Ploug
Most deep ocean carbon flux profiles show low and almost constant fluxes of particulate organic carbon (POC) in the deep ocean. However, the reason for the non-changing POC fluxes at depths is unknown. This study presents direct measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C during a three-week experiment. The average carbon-specific respiration rate during the experiment was 0.12 ± 0.03 at 15...

Sea surface temperatures during Marine Isotope Stage (MIS) 11, supplement to: Milker, Yvonne; Rachmayani, Rima; Weinkauf, Manuel F G; Prange, Matthias; Raitzsch, Markus; Schulz, Michael; Kucera, Michal (2013): Global and regional sea surface temperature trends during Marine Isotope Stage 11. Climate of the Past, 9(5), 2231-2252

Yvonne Milker, Rima Rachmayani, Manuel F G Weinkauf, Matthias Prange, Markus Raitzsch, Michael Schulz & Michal Kucera
The Marine Isotope Stage (MIS) 11 (424-374 ka) was characterized by a protracted deglaciation and an unusually long climatic optimum. It remains unclear to what degree the climate development during this interglacial reflects the unusually weak orbital forcing or greenhouse gas trends. Previously, arguments about the duration and timing of the MIS11 climatic optimum and about the pace of the deglacial warming were based on a small number of key records, which appear to show...

Macrobenthic abundance, biomass, productivity and production in the deep Arctic ocean, supplement to: Degen, Renate; Vedenin, Andrey; Gusky, Manuela; Boetius, Antje; Brey, Thomas (2015): Patterns and trends of macrobenthic abundance, biomass and production in the deep Arctic Ocean. Polar Research, 34(1), 24008

Renate Degen, Andrey Vedenin, Manuela Gusky, Antje Boetius & Thomas Brey
The few existing studies on macrobenthic communities of the deep Arctic Ocean report low standing stocks, and confirm a gradient with declining biomass from the slopes down to the basins as commonly reported for deep-sea benthos. In this study we have further investigated the relationship of faunal abundance (N), biomass (B) as well as community production (P) with water depth, geographical latitude and sea ice concentration. The underlying dataset combines legacy data from the past...

Magnetic susceptibility, XRF and color reflectance data of DSDP Hole 72-516F, cores 113 and 114, supplement to: de Winter, Niels J; Zeeden, Christian; Hilgen, Frederik J (2014): Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous greenhouse world. Climate of the Past, 10(3), 1001-1015

Niels J de Winter, Christian Zeeden & Frederik J Hilgen
Deep marine successions of early Campanian age from DSDP site 516F drilled at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch variability in addition to precession and eccentricity related variations. Elemental abundance ratios point to a similar 5 climatic origin for these variations and exclude a quadripartite structure - as observed in the Mediterranean Neogene - of the precession related cycles as an explanation for the inferred semi-precession cyclicity in MS. However, the semi-precession...

Biogeochemical investigation of the benthic nitrogen cycle in the Arabian Sea off Pakistan, supplement to: Sokoll, Sarah; Holtappels, Moritz; Lam, Phyllis; Collins, Gavin; Schlüter, Michael; Lavik, Gaute; Kuypers, Marcel MM (2012): Benthic nitrogen loss in the Arabian Sea off Pakistan. Frontiers in Microbiology, 3

Sarah Sokoll, Moritz Holtappels, Phyllis Lam, Gavin Collins, Michael Schlüter, Gaute Lavik & Marcel MM Kuypers
A pronounced deficit of nitrogen (N) in the oxygen minimum zone (OMZ) of the Arabian Sea suggests the occurrence of heavy N-loss that is commonly attributed to pelagic processes. However, the OMZ water is in direct contact with sediments on three sides of the basin. Contribution from benthic N-loss to the total N-loss in the Arabian Sea remains largely unassessed. In October 2007, we sampled the water column and surface sediments along a transect cross-cutting...

Geochemistry and grain-size of sediment core PC29A, Quitralco Fjord, Chilean Patagonia, supplement to: Bertrand, Sebastien; Hughen, Konrad A; Sepúlveda, Julio; Pantoja, Silvio (2014): Late Holocene covariability of the southern westerlies and sea surface temperature in Northern Chilean Patagonia. Quaternary Science Reviews, 105, 195-208

Sebastien Bertrand, Konrad A Hughen, Julio Sepúlveda & Silvio Pantoja
The climate of Chilean Patagonia is strongly influenced by the southern westerlies, which control the amount and latitudinal distribution of precipitation in the southern Andes. In austral summer, the Southern Westerly Wind Belt (SWWB) is restricted to the high latitudes. It expands northward in winter, which results in a strong precipitation seasonality between 35 and 45°S. Here, we present a new precipitation seasonality proxy record from Quitralco fjord (46°S), where relatively small latitudinal shifts in...

Potential impact of DOM accumulation on fCO2 and carbonate ion computations in ocean acidification experiments, supplement to: Koeve, Wolfgang; Oschlies, Andreas (2012): Potential impact of DOM accumulation on fCO2 and carbonate ion computations in ocean acidification experiments. Biogeosciences, 9(10), 3787-3798

Wolfgang Koeve & Andreas Oschlies
Culture and mesocosm experiments are often carried out under high initial nutrient concentrations, yielding high biomass concentrations that in turn often lead to a substantial build-up of DOM. In such experiments, DOM can reach concentrations much higher than typically observed in the open ocean. To the extent that DOM includes organic acids and bases, it will contribute to the alkalinity of the seawater contained in the experimental device. Our analysis suggests that whenever substantial amounts...

CaCO3, foraminifer fragmentation, benthic carbon isotopes, coarse lithic counts and radiogenic isotopes (Sr, Nd, Pb) of the Pliocene and earliest Pleistocene terrigenous component (3.3-2.4 Ma) of IODP Site 306-U1313, supplement to: Lang, David C; Bailey, Ian; Wilson, Paul A; Beer, Christopher J; Bolton, Clara T; Friedrich, Oliver; Newsam, Cherry; Spencer, Megan R; Gutjahr, Marcus; Foster, Gavin L; Cooper, Matthew J; Milton, J Andy (2014): The transition on North America from the warm humid Pliocene to the glaciated Quaternary traced by eolian dust deposition at a benchmark North Atlantic Ocean drill site. Quaternary Science Reviews, 93, 125-141

David C Lang, Ian Bailey, Paul A Wilson, Christopher J Beer, Clara T Bolton, Oliver Friedrich, Cherry Newsam, Megan R Spencer, Marcus Gutjahr, Gavin L Foster, Matthew J Cooper & J Andy Milton
We present Plio-Pleistocene records of sediment color, %CaCO3, foraminifer fragmentation, benthic carbon isotopes (d13C) and radiogenic isotopes (Sr, Nd, Pb) of the terrigenous component from IODP Site U1313, a reoccupation of benchmark subtropical North Atlantic Ocean DSDP Site 607. We show that (inter)glacial cycles in sediment color and %CaCO3 pre-date major northern hemisphere glaciation and are unambiguously and consistently correlated to benthic oxygen isotopes back to 3.3 million years ago (Ma) and intermittently so probably...

Total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXVII/1 with links to images

Andreas Macke & John Kalisch
This data collection contains total Sky Imager observations and continuous radiation measurements during POLARSTERN cruise ANT-XXVII/1.

High resolution isotope and Mg/Ca record of sediment core GeoB12615-4, supplement to: Romahn, Sarah; Mackensen, Andreas; Groeneveld, Jeroen; Pätzold, Jürgen (2014): Deglacial intermediate water reorganization: new evidence from the Indian Ocean. Climate of the Past, 10(1), 293-303

Sarah Romahn, Andreas Mackensen, Jeroen Groeneveld & Jürgen Pätzold
The importance of intermediate water masses in climate change and ocean circulation has been emphasized recently. In particular, Southern Ocean Intermediate Waters (SOIW), such as Antarctic Intermediate Water and Subantarctic Mode Water, are thought to have acted as active interhemispheric transmitter of climate anomalies. Here we reconstruct changes in SOIW signature and spatial and temporal evolution based on a 40 kyr time series of oxygen and carbon isotopes as well as planktic Mg/Ca based thermometry...

Hydrological and meteorological records from the Vernagtferner Basin - Vernagtbach station, for the years 2002 to 2012

Heidi Escher-Vetter, Ludwig N Braun & Matthias Siebers
In November 2001, two separate Campbell loggers ("Meteologger" and "Hydrologger", both type CR23X) were installed at the Vernagtbach site in the Oetztal Alps, Austria (Latitude: 46.85; Longitude: 10.82; Elevation: 2640 m). On these loggers, 10-minutes centred averages for the meteorological data and 5-minutes centred averages for the hydrological data are recorded. The meteorological parameters comprise air temperature, humidity of the air, air pressure, four radiation components, wind direction and speed, precipitation and snow height. For...

Nd bulk isotopes and 40Ar/39Ar ages of individual minerals from Aurora and Wilkes sub-glacial basin sediments, supplement to: Pierce, Elizabeth L; Williams, Trevor; van de Flierdt, Tina; Hemming, Sidney R; Goldstein, Steven L; Brachfeld, Stefanie A (2011): Characterizing the sediment provenance of East Antarctica's weak underbelly: The Aurora and Wilkes sub-glacial basins. Paleoceanography, 26(4), PA4217

Elizabeth L Pierce, Trevor Williams, Tina van de Flierdt, Sidney R Hemming, Steven L Goldstein & Stefanie A Brachfeld
The Wilkes and Aurora basins are large, low-lying sub-glacial basins that may cause areas of weakness in the overlying East Antarctic ice sheet. Previous work based on ice-rafted debris (IRD) provenance analyses found evidence for massive iceberg discharges from these areas during the late Miocene and Pliocene. Here we characterize the sediments shed from the inferred areas of weakness along this margin (94°E to 165°E) by measuring40Ar/39Ar ages of 292 individual detrital hornblende grains from...

Mineralogy and geochemistry of Holocene sediments from the North Atlantic, supplement to: Fagel, Nathalie; Mattielli, Nadine (2011): Holocene evolution of deep circulation in the northern North Atlantic traced by Sm, Nd and Pb isotopes and bulk sediment mineralogy. Paleoceanography, 26(4), PA4220

Nathalie Fagel & Nadine Mattielli
Bulk mineralogy, Sm, Nd and Pb elemental and isotopic compositions of the clay-size fraction of Holocene sediments were analyzed in three deep North Atlantic cores to trace the particle provenance. The aims of the present paper are to identify the origin of the particles driven by deep currents and to reconstruct deep circulation changes over the Holocene in the North Atlantic. The three cores are retrieved in fracture zones; two of them are located in...

Isotopic record across the Aptian/Albian boundary of ODP Hole 171-1049C, supplement to: Huber, Brian T; MacLeod, Kenneth G; Gröcke, Darren R; Kucera, Michal (2011): Paleotemperature and paleosalinity inferences and chemostratigraphy across the Aptian/Albian boundary in the subtropical North Atlantic. Paleoceanography, 26(4), PA4221

Brian T Huber, Kenneth G MacLeod, Darren R Gröcke & Michal Kucera
Geochemical analyses of extraordinarily well preserved late Aptian-early Albian foraminifera from Blake Nose (Ocean Drilling Program Site 1049) reveal rapid shifts of d18O, d13C, and 87Sr/88Sr in the subtropical North Atlantic that may be linked to a major planktic foraminifer extinction event across the Aptian/Albian boundary. The abruptness of the observed geochemical shifts and their coincidence with a sharp lithologic contact is explained as an artifact of a previously undetected hiatus of 0.8-1.4 million years...

Stable carbon isotopic composition of biomarker lipids of DSDP Hole 31-302, supplement to: Schoon, Petra L; Sluijs, Appy; Sinninghe Damsté, Jaap S; Schouten, Stefan (2011): Stable carbon isotope patterns of marine biomarker lipids in the Arctic Ocean during Eocene Thermal Maximum 2. Paleoceanography, 26(3), PA3215

Petra L Schoon, Appy Sluijs, Jaap S Sinninghe Damsté & Stefan Schouten
The middle Paleocene through early Eocene long-term gradual warming was superimposed by several transient warming events, such as the Paleocene-Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM2). Both events show evidence for extreme global warming associated with a major injection of carbon into the ocean-atmosphere system, but the mechanisms of carbon injection and many aspects of the environmental response are still poorly understood. In this study, we analyzed the concentration and stable carbon...

Pollen and non-pollen palynomorph records of the Holocene part of the composite sediment core TMD from lake Tso Moriri (NW India) and of modern surface samples from the Tso Moriri region, supplement to: Leipe, Christian; Demske, Dieter; Tarasov, Pavel E; Wünnemann, Bernd; Riedel, Frank (2014): Potential of pollen and non-pollen palynomorph records from Tso Moriri Trans-Himalaya, NW India) for reconstructing Holocene limnology, and human-environmental interactions. Quaternary International, 348, 113-129

Christian Leipe, Dieter Demske, Pavel E Tarasov, Bernd Wünnemann & Frank Riedel
The high-altitude lake Tso Moriri (32°55'46'' N, 78°19'24'' E; 4522 m a.s.l.) is situated at the margin of the ISM and westerly influences in the Trans-Himalayan region of Ladakh. Human settlements are rare and domestic and wild animals are concentrating at the alpine meadows. A set of modern surface samples and fossil pollen from deep-water TMD core was evaluated with a focus on indicator types revealing human impact, grazing activities and lake system development during...

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