640 Works

Particle fluxes obtained from sediment trap experiments in the northern Indian Ocean, supplement to: Rixen, Tim; Gaye, Birgit; Emeis, Kay-Christian (2019): The monsoon, carbon fluxes, and the organic carbon pump in the northern Indian Ocean. Progress in Oceanography, 175, 24-39

Tim Rixen, Birgit Gaye, Kay-Christian Emeis, Venkitasubramani Ramaswamy & Venugopalan Ittekkot
The sediment trap experiment started in 1986 and was expanded into the Bay of Bengal only one year later in 1987. The fieldwork ended at around 1998. In 2007 and 2008, we tried to reinitiate a sediment trap program in the Arabian Sea, although this could not be followed up due to piracy, which became an issue in the region at that time. The sediment trap sites in the northern and central Bay of Bengal...

Poly- and perfluoroalkyl substances measured in air and seawater of the North Sea in 2009, supplement to: Xie, Zhiyong; Zhao, Zhen; Möller, Axel; Wolschke, Hendrik; Ahrens, Lutz; Sturm, Renate; Ebinghaus, Ralf (2013): Neutral poly- and perfluoroalkyl substances in air and seawater of the North Sea. Environmental Science and Pollution Research, 20(11), 7988-8000

Zhiyong Xie, Zhen Zhao, Axel Möller, Hendrik Wolschke, Lutz Ahrens, Renate Sturm & Ralf Ebinghaus
Concentrations of neutral poly- and perfluoroalkyl substances (PFASs), such as fluorotelomer alcohols (FTOHs), perfluoroalkane sulfonamides (FASAs), perfluoroalkane sufonamidoethanols (FASEs), and fluorotelomer acrylates (FTACs), have been simultaneously determined in surface seawater and the atmosphere of the North Sea. Seawater and air samples were taken aboard the German research vessel Heincke on the cruise 303 from 15 to 24 May 2009. The concentrations of FTOHs, FASAs, FASEs, and FTACs in the dissolved phase were 2.6-74, <0.1-19, <0.1-63,...

Variability in carbon availability and eelgrass (Zostera marina) biometrics along an estuarine gradient in Willapa Bay, WA, USA, supplement to: Ruesink, Jennifer L; Yang, Sylvia; Trimble, Alan C (2015): Variability in carbon availability and eelgrass (Zostera marina) biometrics along an estuarine gradient in Willapa Bay, WA, USA. Estuaries and Coasts, 38(6), 1908-1917

Jennifer L Ruesink, Sylvia Yang & Alan C Trimble
Because photosynthesis requires CO2, carbon limitation in aquatic environments could restrict primary production and provide signals in tissue chemistry. We took advantage of spatial variability of aqueous [CO2] in estuaries to examine within-estuary variation in biometrics of intertidal eelgrass (Zostera marina) during peak summer production. As expected from the sensitivity of carbonate equilibria to pH, aqueous [CO2] increased along an ocean-to-river gradient in Willapa Bay, WA, USA. The scale of pH variability also changed, reflecting...

A MATLAB algorithm for the quantification of NGR spectra, supplement to: De Vleeschouwer, David; Dunlea, Ann G; Auer, Gerald; Anderson, Chloe H; Brumsack, Hans-Jürgen; de Loach, Aaron; Gurnis, Michael; Huh, Youngsook; Ishiwa, Takeshige; Jang, Kwangchul; Kominz, Michelle A; März, Christian; Schnetger, Bernhard; Murray, Richard W; Pälike, Heiko; Expedition 356 shipboard scientists (2017): Quantifying K, U, and Th contents of marine sediments using shipboard natural gamma radiation spectra measured on DV JOIDES Resolution. Geochemistry, Geophysics, Geosystems, 18(3), 1053-1064

David De Vleeschouwer, Ann G Dunlea, Gerald Auer, Chloe H Anderson, Hans-Jürgen Brumsack, Aaron de Loach, Michael Gurnis, Youngsook Huh, Takeshige Ishiwa, Kwangchul Jang, Michelle A Kominz, Christian März, Bernhard Schnetger, Richard W Murray, Heiko Pälike &
During International Ocean Discovery Program (IODP) expeditions, shipboardgenerated data provide the first insights into the cored sequences. The natural gamma radiation (NGR) of the recovered material, for example, is routinely measured on the ocean drilling research vessel DV JOIDES Resolution. At present, only total NGR counts are readily available as shipboard data, although full NGR spectra (counts as a function of gamma-ray energy level) are produced and archived. These spectra contain unexploited information, as one...

Geochemistry of solid and dissolved phases of IODP EXP340 holes, supplement to: Murray, Natalie A; Muratli, Jesse M; Hartwell, Anne M; Manners, Hayley; Megowan, Meghan; Goñi, Nicolas; Palmer, Martin R; McManus, James (2016): Data report: dissolved minor element compositions, sediment major and minor element concentrations, and reactive iron and manganese data from the Lesser Antilles volcanic arc region, IODP Expedition 340 Sites U1394, U1395, U1396, U1399, and U1400. In: Le Friant, A; Ishizuka, O; Stroncik, N.A and the Expedition 340 Scientists (eds.) Proceedings of the IODP, Integrated Ocean Drilling Program (Integrated Ocean Drilling Program Management International, Inc.), 340

Natalie A Murray, Jesse M Muratli, Anne M Hartwell, Hayley Manners, Meghan Megowan, Nicolas Goñi, Martin R Palmer & James McManus
We measured dithionite-extractable iron and manganese along with a variety of bulk sedimentary solid and dissolved phases to constrain diagenetic reactions occurring within the sediment package of Grenada Basin, which is within the Lesser Antilles volcanic arc region. Core material was obtained during Integrated Ocean Drilling Program Expedition 340. For this report we focus primarily on five sites; three sites are located in the northern portion of the study area off the island of Montserrat...

Upper air soundings during POLARSTERN cruise PS109 (ARK-XXXI/4)

Holger Schmithüsen
Upper air soundings onboard Polarstern are normally performed once a day to measure vertical profiles of air pressure, temperature, relative humidity and the wind vector. Helium filled balloons (TOTEX 600 g) were used to carry Vaisala RS92-SGP radiosondes. Whenever possible, the launches were carried out shortly before 11 UTC, in order to reach 100 hPa at 12 UTC. Condensed measurements (TEMP Format FM-35, BUFR) were transferred without delay into the Global Telecommunication System GTS, were...

SST reconstruction and TOC concentration of Baltic Sea sediment cores, supplement to: Warden, Lisa; Moros, Matthias; Neumann, Thomas; Shennan, Ian; Timpson, Adrian; Manning, Katie; Sollai, Martina; Wacker, Lukas; Perner, Kerstin; Häusler, Katharina; Leipe, Thomas; Zillén, Lovisa; Kotilainen, Aarno T; Jansen, Eystein; Schneider, Ralph R; Oeberst, R; Arz, Helge Wolfgang; Sinninghe Damsté, Jaap S (2017): Climate induced human demographic and cultural change in northern Europe during the mid-Holocene. Scientific Reports, 7(1)

Lisa Warden, Matthias Moros, Thomas Neumann, Ian Shennan, Adrian Timpson, Katie Manning, Martina Sollai, Lukas Wacker, Kerstin Perner, Katharina Häusler, Thomas Leipe, Lovisa Zillén, Aarno T Kotilainen, Eystein Jansen, Ralph R Schneider, R Oeberst, Helge Wolfgang Arz & Jaap S Sinninghe Damsté
The transition from hunter-gatherer-fisher groups to agrarian societies is arguably the most significant change in human prehistory. In the European plain there is evidence for fully developed agrarian societies by 7,500 cal. yr BP, yet a well-established agrarian society does not appear in the north until 6,000 cal. yr BP for unknown reasons. Here we show a sudden increase in summer temperature at 6,000 cal. yr BP in northern Europe using a well-dated, high resolution...

Organic geochemical investigation of sediments in the Japan Sea: Tracking paleoceanographic and paleoclimatic changes since the mid-Miocene

Frederike Wittkopp
The mid- to late Miocene marks one of the last warm periods of the Neogene, before the descent in to the ice house climate of the late Pliocene and Pleistocene. The mid- to late Miocene climate was long overlooked, but receives increasingly more interest. This study used organic geochemical biomarker distributions and their isotopic signatures in sediment samples from the Japan Sea, recovered during IODP Expedition 346 and ODP Leg 127/128. It was the aim...

Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites, supplement to: Huck, Claire E; van de Flierdt, Tina; Bohaty, Steven M; Hammond, Samantha J (2017): Antarctic climate, Southern Ocean circulation patterns, and deep water formation during the Eocene. Paleoceanography

Claire E Huck, Tina van de Flierdt, Steven M Bohaty & Samantha J Hammond
We assess early-to-middle Eocene seawater neodymium (Nd) isotope records from seven Southern Ocean deep-sea drill sites to evaluate the role of Southern Ocean circulation in long-term Cenozoic climate change. Our study sites are strategically located on either side of the Tasman Gateway and are positioned at a range of shallow (<500 m) to intermediate/deep (~1000-2500 m) paleowater depths. Unradiogenic seawater Nd isotopic compositions, reconstructed from fish teeth at intermediate/deep Indian Ocean pelagic sites (Ocean Drilling...

Tropical SSTs over the past 3.5 million years, supplement to: Herbert, Timothy D; Peterson, Laura C; Lawrence, Kira T; Liu, Zhonghui (2010): Tropical Ocean Temperatures Over the Past 3.5 Million Years. Science, 328(5985), 1530-1534

Timothy D Herbert, Laura C Peterson, Kira T Lawrence & Zhonghui Liu
Determining the timing and amplitude of tropical sea surface temperature (SST) change is an important part of solving the puzzle of the Plio-Pleistocene ice ages. Alkenone-based tropical SST records from the major ocean basins show coherent glacial-interglacial temperature changes of 1° to 3°C that align with (but slightly lead) global changes in ice volume and deep ocean temperature over the past 3.5 million years. Tropical temperatures became tightly coupled with benthic d18O and orbital forcing...

Coccolithophore assemblage and palaeoproductivity proxies at sediment core PS75/059-2, supplement to: Saavedra-Pellitero, Mariem; Baumann, Karl-Heinz; Ullermann, Johannes; Lamy, Frank (2017): Marine Isotope Stage 11 in the Pacific sector of the Southern Ocean; a coccolithophore perspective. Quaternary Science Reviews, 158, 1-14

Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Johannes Ullermann & Frank Lamy
This work aims to provide new insights into environmental conditions during late Pleistocene Marine Isotope Stage 11 (MIS 11) in the Southern Ocean. We generated a multi-proxy coccolithophore dataset based on sediment core PS75/059-2. This core was retrieved at the western flank of the southern East Pacific Rise crest at ~3600 m water depth. Coccolithophore assemblage counts indicated that the coccolith fraction (CF; <20 µm) during MIS 11 was dominated by Gephyrocapsa caribbeanica and subsequently...

Modeling the biogeography of pelagic diatoms of the Southern Ocean, links to model results and images, supplement to: Pinkernell, Stefan (2017): Modeling the biogeography of pelagic diatoms of the Southern Ocean. PhD Thesis, University of Rostock, Germany

Stefan Pinkernell
Species distribution models (SDM) are a widely used and well established method for biogeographical research on terrestrial organisms. Though already used for decades, experience with marine species is scarce especially for protists. More and more observation data, sometimes even aggregated over centuries, become available also for the marine world, which together with high quality environmental data form a promising base for marine SDMs. In contrast to these SDMs, typical biogeographical studies of diatoms only considered...

Elements and Sr-Nd-Pb isotopic evidences of the residual fractions from ODP Hole 195-1202B, supplement to: Dou, Yanguang; Yang, Shouye; Shi, Xuefa; Clift, Peter D; Liu, Shengfa; Liu, Jihua; Li, Chao; Bi, Lei; Zhao, Yun (2016): Provenance weathering and erosion records in southern Okinawa Trough sediments since 28ka: Geochemical and Sr–Nd–Pb isotopic evidences. Chemical Geology, 425, 93-109

Yanguang Dou, Shouye Yang, Xuefa Shi, Peter D Clift, Shengfa Liu, Jihua Liu, Chao Li, Lei Bi & Yun Zhao
Geochemical and Sr-Nd-Pb isotopic compositions of the detrital sediments from ODP Hole 1202B and Taiwan rivers were measured in this study, aiming to reveal changes in sediment provenance in the southern Okinawa Trough (SOT) since 28 ka, and to examine the weathering and sediment transport processes in response to monsoon climate variability. Large variations in Sr-Nd-Pb isotopic ratios at 11?9 ka suggest changes in detrital sediment provenance in the SOT from a dominance of the...

I/Ca and carbon and oxygen isotopes of N. pachyderma and C. cf. wuellerstorf at sediment cores PS2547-3 and JR179-TC493, supplement to: Lu, Zunli; Hoogakker, Babette A A; Hillenbrand, Claus-Dieter; Zhou, Xiaoli; Thomas, Ellen; Gutchess, Kristina M; Lu, Wanyi; Jones, Luke; Rickaby, Rosalind E M (2016): Oxygen depletion recorded in upper waters of the glacial Southern Ocean. Nature Communications, 7, 11146

Zunli Lu, Babette A A Hoogakker, Claus-Dieter Hillenbrand, Xiaoli Zhou, Ellen Thomas, Kristina M Gutchess, Wanyi Lu, Luke Jones & Rosalind E M Rickaby
Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ~2.5 µmol/mol indicate the presence of O2-depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration...

Shear strength messurements and radiocarbon ages of sediment cores from the western Barents Sea shelf, supplement to: Lantzsch, Hendrik; Hanebuth, Till J J; Horry, Jan; Grave, Marina; Rebesco, Michele; Schwenk, Tilmann (2017): Deglacial to Holocene history of ice-sheet retreat and bottom current strength on the western Barents Sea shelf. Quaternary Science Reviews, 173, 40-57

Hendrik Lantzsch, Till J J Hanebuth, Jan Horry, Marina Grave, Michele Rebesco & Tilmann Schwenk
High-resolution sediment echosounder data combined with radiocarbon-dated sediment cores allowed us to reconstruct the Late Quaternary stratigraphic architecture of the Kveithola Trough and surrounding Spitsbergenbanken. The deposits display the successive deglacial retreat of the Svalbard-Barents Sea Ice Sheet. Basal subglacial till indicates that the grounded ice sheet covered both bank and trough during the Late Weichselian. A glaciomarine blanket inside the trough coinciding with laminated plumites on the bank formed during the initial ice-melting phase...

Mineralogical analysis of drill core Omok-1 at Omokoroa, Bay of Plenty, supplement to: Kluger, Max Oke; Moon, Vicki G; Kreiter, Stefan; Lowe, David J; Churchman, G J; Hepp, Daniel A; Seibel, David; Jorat, Ehsan M; Mörz, Tobias (2017): A new attraction-detachment model for explaining flow sliding in clay-rich tephras. Geology, 45(2), 131-134

Max Oke Kluger, Vicki G Moon, Stefan Kreiter, David J Lowe, G J Churchman, Daniel A Hepp, David Seibel, Ehsan M Jorat & Tobias Mörz
Altered pyroclastic (tephra) deposits are highly susceptible to landsliding, leading to fatalities and property damage every year. Halloysite, a low-activity clay mineral, is commonly associated with landslide-prone layers within altered tephra successions, especially in deposits with high sensitivity, which describes the post-failure strength loss. However, the precise role of halloysite in the development of sensitivity, and thus in sudden and unpredictable landsliding, is unknown. Here we show that an abundance of mushroom cap?shaped (MCS) spheroidal...

X-ray fluorescence scannings and AMS radicarbon dates of sediment core GeoB12605-3, supplement to: Liu, Xi-Ting; Rendle-Bühring, Rebecca; Kuhlmann, Holger; Li, Anchun (2017): Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania. Earth and Planetary Science Letters, 460, 123-134

Xi-Ting Liu, Rebecca Rendle-Bühring, Holger Kuhlmann & Anchun Li
During the Holocene, the most notably climatic change across the African continent is the African Humid Period (AHP), however the pace and primary forcing for this pluvial condition is still ambiguous, particularly in East Africa. We present a high-resolution marine sediment record off Tanzania to provide insights into the climatic conditions of inland East Africa during the Holocene. Major element ratios (i.e., log-ratios of Fe/Ca and Ti/Ca), derived from X-Ray Fluorescence scanning, have been employed...

Neodymium, lead and strontium isotope data of down core leachate and bulk digest of ODP Hole 151-911A, supplement to: Teschner, Claudia; Frank, Martin; Haley, Brian A; Knies, Jochen (2016): Plio-Pleistocene evolution of water mass exchange and erosional input at the Atlantic-Arctic gateway. Paleoceanography, 31(5), 582-599

Claudia Teschner, Martin Frank, Brian A Haley & Jochen Knies
Water mass exchange between the Arctic Ocean and the Norwegian-Greenland Seas has played an important role for the Atlantic thermohaline circulation and Northern Hemisphere climate. We reconstruct past water mass mixing and erosional inputs from the radiogenic isotope compositions of neodymium (Nd), lead (Pb), and strontium (Sr) at Ocean Drilling Program site 911 (leg 151) from 906 m water depth on Yermak Plateau in the Fram Strait over the past 5.2 Myr. The isotopic compositions...

Rare earth elements and Neodymium isotopic analysis from ODP Site 130-807, supplement to: Le Houedec, Sandrine; Meynadier, Laure M; Allègre, Claude J (2016): Seawater Nd isotope variation in the Western Pacific Ocean since 80Ma (ODP 807, Ontong Java Plateau). Marine Geology, 380, 138-147

Sandrine Le Houedec, Laure M Meynadier & Claude J Allègre
This study reports neodymium isotopic (e-Nd) variability at a time resolution of 0.5 to 3 Ma since the Late Cretaceous as recorded in a marine sedimentary core from the Western Pacific (ODP 807; 3°36'N, 156°3?E; Ontong Java Plateau). Our core is mainly fine-grained and composed of continuous sequences of nannofossil oozes. The e-Nd measured in the carbonate fraction was used as a proxy of e-Nd of seawater of the Western Pacific. On a long term,...

Hydroacoustic data showing the emergence of a methane-related pockmark field in the Helgoland Reef area in the German Bight, supplement to: Krämer, Knut; Holler, Peter; Herbst, Gabriel; Bratek, Alexander; Ahmerkamp, Soeren; Neumann, Andreas; Bartholomä, Alexander; van Beusekom, Justus; Holtappels, Moritz; Winter, Christian (2017): Abrupt emergence of a large pockmark field in the German Bight, southeastern North Sea. Scientific Reports, 7(1)

Knut Krämer, Gabriel Herbst & Christian Winter
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...

Methane profiles along the continental margin off Svalbard, supplement to: Mau, Susan; Römer, Miriam; Torres, Marta E; Bussmann, Ingeborg; Pape, Thomas; Damm, Ellen; Geprägs, Patrizia; Wintersteller, Paul; Hsu, Chieh-Wei; Loher, Markus; Bohrmann, Gerhard (2017): Widespread methane seepage along the continental margin off Svalbard - from Bjørnøya to Kongsfjorden. Scientific Reports, 7, 42997

Susan Mau, Miriam Römer, Marta E Torres, Ingeborg Bussmann, Thomas Pape, Ellen Damm, Patrizia Geprägs, Paul Wintersteller, Chieh-Wei Hsu, Markus Loher & Gerhard Bohrmann
Numerous articles have recently reported on gas seepage offshore Svalbard, because the gas emission from these Arctic sediments was thought to result from gas hydrate dissociation, possibly triggered by anthropogenic ocean warming. We report on findings of a much broader seepage area, extending from 74° to 79°, where more than a thousand gas discharge sites were imaged as acoustic flares. The gas discharge occurs in water depths at and shallower than the upper edge of...

Mediterranean Outflow Water variability during the Early Pleistocene, supplement to: Kaboth, Stefanie; Grunert, Patrick; Lourens, Lucas Joost (2017): Mediterranean Outflow Water variability during the Early Pleistocene. Climate of the Past, 13(8), 1023-1035

Stefanie Kaboth, Patrick Grunert & Lucas Joost Lourens
Gaining insights into the evolution of Mediterranean Outflow Water (MOW) during the Early Pleistocene climate transition has been so far hampered by the lack of available paleoclimatic archives. Here we present the first benthic foraminifera stable oxygen and carbon isotope records and grain-size data from IODP Expedition 339 Site U1389 presently located within the upper core of the MOW in the Gulf of Cadiz for the time interval between 2.6 and 1.8 Ma. A comparison...

Stable isotope (δ¹³C, d15N), and n-alkane patterns of bryophytes along hydrological gradients of low-centred polygon of the Siberian Arctic, supplement to: Zibulski, Romy; Wesener, Felix; Wilkes, Heinz; Plessen, Birgit; Pestryakova, Luidmila A; Herzschuh, Ulrike (2016): C/N ratio, stable isotope (d13C, d15N), and n-alkane patterns of bryophytes along hydrological gradients of low-centred polygon of the Siberian Arctic. Biogeosciences Discussions, 27 pp

Romy Zibulski, Felix Wesener, Heinz Wilkes, Birgit Plessen, Luidmila A Pestryakova & Ulrike Herzschuh
Mosses are a major component of the arctic vegetation, particularly of wetlands. We present C/N ratio, d13C and d15N data of 400 moss samples belonging to 10 species that were collected along hydrological gradients within polygonal mires located on the southern Taymyr Peninsula and the Lena River delta in northern Siberia. Additionally, n alkane patterns of six of these taxa were investigated. The aim of the study is to see whether the inter- and intra-specific...

Field and simulation data for larches growing in the Taimyr treeline ecotone, supplement to: Wieczorek, Mareike; Kruse, Stefan; Epp, Laura Saskia; Kolmogorov, Alexei; Nikolaev, Anatoly N; Heinrich, Ingo; Jeltsch, Florian; Pestryakova, Luidmila A; Zibulski, Romy; Herzschuh, Ulrike (2017): Dissimilar responses of larch stands in northern Siberia to increasing temperatures-a field and simulation based study. Ecology, 98(9), 2343-2355

Mareike Wieczorek, Stefan Kruse, Laura Saskia Epp, Alexei Kolmogorov, Anatoly N Nikolaev, Ingo Heinrich, Florian Jeltsch, Luidmila A Pestryakova, Romy Zibulski & Ulrike Herzschuh
Arctic and alpine treelines worldwide differ in their reactions to climate change. A northward advance of or densification within the treeline ecotone will likely influence climate-vegetation feedback mechanisms. In our study, which was conducted in the Taimyr Depression in the North Siberian Lowlands, w present a combined field- and model-based approach helping us to better understand the population processes involved in the responses of the whole treeline ecotone, spanning from closed forest to single-tree tundra,...

Experiment on effects of elevated pCO2 on bivalve dominated communities, supplement to: Schade, Hanna; Mevenkamp, Lisa; Guilini, Katja; Meyer, Stefanie; Gorb, Stanislav N; Abele, Doris; Vanreusel, Ann; Melzner, Frank (2016): Simulated leakage of high pCO2 water negatively impacts bivalve dominated infaunal communities from the Western Baltic Sea. Scientific Reports, 6, 31447

Hanna Schade, Lisa Mevenkamp, Katja Guilini, Stefanie Meyer, Stanislav N Gorb, Doris Abele, Ann Vanreusel & Frank Melzner
Sandy communities were exposed to six different seawater pCO2 regimes for a total of three months (17.12.2011–06.03.2012) in a climate - controlled room. Six header tanks were continuously supplied with filtered seawater from Kiel Fjord, each one connected to six experimental units (EU) ensuring continuous seawater supply. Each EU consisted of a round plastic container with a volume of 12.5 L containing ca. 9.5 L of sediment and an overlying water column of ca. 3...

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