456 Works

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...

Experiment: summer mortality phenomena in pacific oysters, supplement to: Wendling, Carolin Charlotte; Wegner, K Mathias (2013): Relative contribution of reproductive investment, thermal stress and Vibrio infection to summer mortality phenomena in Pacific oysters. Aquaculture, 412-413, 88-96

Carolin Charlotte Wendling & K Mathias Wegner
Mass mortalities of Pacific oysters Crassostrea gigas occur regularly when temperatures are high. Elevated temperatures facilitate the proliferation and spread of pathogens and simultaneously impose physiological stress on the host. Additionally, periods of high temperatures coincide with the oyster spawning season. Spawning is energetically costly and can further compromise oyster immunity. Most studies monitoring the underlying factors of oyster summer mortality in the field, point to the involvement of abiotic and biotic factors including low...

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...

Position measurements at GPS station HGRA (Hochgrat)

Florian Seitz, Herbert Arenz & Franz Leismüller
Measurements at GPS station HGRA in the Bavarian Alps are part of the Geodetic Alpine Integrated Network (GAIN) of the ALPS-GPSQUAKENET project.

Coccolith fluxes in the Santa Barbara Basin, supplement to: Grelaud, Michaël; Beaufort, Luc; Cuven, Stéphanie; Buchet, Noëlle (2009): Glacial to interglacial primary production and El Niño-Southern Oscillation dynamics inferred from coccolithophores of the Santa Barbara Basin. Paleoceanography, 24(1), PA1203

Michaël Grelaud, Luc Beaufort, Stéphanie Cuven & Noëlle Buchet
We investigate the long-term stability of El Niño-Southern Oscillation and Pacific Decadal Oscillation based on the examination of coccolithophore assemblages in a largely laminated 35 ka sedimentary record, retrieved in the Santa Barbara Basin (core MD02-2503). At a centennial scale coccolith assemblages indicate low primary production in the basin from 35 to 11.5 ka B.P., whereas the Holocene is characterized by high-productivity conditions. This pattern demonstrates the influence of the glacial-interglacial cycles on productivity and,...

Evaluation of long chain 1,14-alkyl diols in marine sediments as indicators for upwelling and temperature, supplement to: Rampen, Sebastiaan W; Willmott, Verónica; Kim, Jung-Hyun; Rodrigo-Gámiz, Marta; Uliana, Eleonora; Mollenhauer, Gesine; Schefuß, Enno; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Evaluation of long chain 1,14-alkyl diols in marine sediments as indicators for upwelling and temperature. Organic Geochemistry, 76, 39-47

Sebastiaan W Rampen, Verónica Willmott, Jung-Hyun Kim, Marta Rodrigo-Gámiz, Eleonora Uliana, Gesine Mollenhauer, Enno Schefuß, Jaap S Sinninghe Damsté & Stefan Schouten
Long chain alkyl diols form a group of lipids occurring widely in marine environments. Recent studies have suggested several palaeoclimatological applications for proxies based on their distributions, but also revealed uncertainties about their applicability. Here we evaluate the use of long chain 1,14-alkyl diol indices for reconstruction of temperature and upwelling conditions by comparing index values, obtained from a comprehensive set of marine surface sediments, with environmental factors like sea surface temperature (SST), salinity and...

Characteristics of sediments from Amvrakikos Gulf, Greece, supplement to: Naeher, Sebastian; Geraga, Maria; Papatheodorou, George; Ferentinos, George; Kaberi, Helen; Schubert, Carsten J (2012): Environmental variations in a semi-enclosed embayment (Amvrakikos Gulf, Greece) - reconstructions based on benthic foraminifera abundance and lipid biomarker pattern. Biogeosciences, 9(12), 5081-5094

Sebastian Naeher, Maria Geraga, George Papatheodorou, George Ferentinos, Helen Kaberi & Carsten J Schubert
The evolution of environmental changes during the last decades and the impact on the living biomass in the western part of Amvrakikos Gulf was investigated using abundances and species distributions of benthic foraminifera and lipid biomarker concentrations. These proxies indicated that the gulf has markedly changed due to eutrophication. Eutrophication has led to a higher productivity, a higher bacterial biomass, shifts towards opportunistic and tolerant benthic foraminifera species (e.g. Bulimina elongata, Nonionella turgida, Textularia agglutinans,...

Vegetation composition of herbaceous and tree layer of seven dominating vegetation types in the Aguima Catchment, Benin

Bettina Orthmann
Species data of herb and tree layer are necessary in order characterise the seven dominant vegetation types and to analyse for differences between the vegetation types. Species composition of the herb layer is also relevant as base for grazing quality. Tree species composition is especially important for silvicultural interest. Species composition of the herb and tree layer was recorded and cover of each species estimated. Datasets created by IMPETUS subproject A3. IMPETUS data set ID:...

Anisotropy-magnetic susceptibility from the Krems Wachtberg archaeological Site (Austria) and high temperature susceptibility, supplement to: Zeeden, Christian; Hambach, Ulrich; Händel, Marc (2015): Loess magnetic fabric of the Krems-Wachtberg archaeological site. Quaternary International, 372, 188-194

Christian Zeeden, Ulrich Hambach & Marc Händel
The loess sediment embedding the main Gravettian layer at the Krems-Wachtberg archaeological site facilitates exceptional preservation. To gain insight in the sedimentation process before and after the Paleolithic settlement, the magnetic fabric (preferential orientation of magnetic particles) of loess of the Krems-Wachtberg site is investigated. Magnetic fabric properties clearly show an eolian origin of the loess, but may indicate some relocation in the meter above the cultural layer. The magnetic fabric properties can be divided...

Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems, supplement to: Tremblay, Nelly; Abele, Doris (2016): Response of three krill species to hypoxia and warming: an experimental approach to oxygen minimum zones expansion in coastal ecosystems. Marine Ecology, 37(1), 179-199

Nelly Tremblay & Doris Abele
To understand the adaptation of euphausiid (krill) species to oxygen minimum zones (OMZ), respiratory response and stress experiments combining hypoxia/reoxygenation exposure with warming were conducted. Experimental krill species were obtained from the Antarctic (South Georgia area), the Humboldt Current system (HCS, Chilean coast), and the Northern California Current system (NCCS, Oregon). Euphausia mucronata from the HCS shows oxyconforming or oxygen partial pressure (pO2)-dependent respiration below 80% air saturation (18 kPa). Normoxic subsurface oxygenation in winter...

Geochemistry of karst headwaters, supplement to: van Geldern, Robert; Schulte, Peter; Mader, Michael; Baier, Alfons; Barth, Johannes A C (2015): Spatial and temporal variations of pCO2, dissolved inorganic carbon, and stable isotopes along a temperate karstic watercourse. Hydrological Processes, 29(15), 3423-3440

Robert van Geldern, Peter Schulte, Michael Mader, Alfons Baier & Johannes A C Barth
This study investigated CO2 degassing and related carbon isotope fractionation effects in the Wiesent River that drains a catchment in the karst terrain of the Fraconian Alb, Southern Germany. The river was investigated by physico-chemical and stable isotope analyses of water and dissolved inorganic carbon during all seasons in 2010 along 65 km long downstream transects between source and mouth. This data set contains the results of field and solute parameters (temperature, conductivity, pH, total...

A four-year record of UK'37- and TEX86-derived sea surface temperature estimates from sinking particles in the filamentous upwelling region off Cape Blanc, Mauritania, supplement to: Mollenhauer, Gesine; Basse, Andreas; Kim, Jung-Hyun; Sinninghe Damsté, Jaap S; Fischer, Gerhard (2015): A four-year record of UK′37- and TEX86-derived sea surface temperature estimates from sinking particles in the filamentous upwelling region off Cape Blanc, Mauritania. Deep Sea Research Part I: Oceanographic Research Papers, 97, 67-79

Gesine Mollenhauer, Andreas Basse, Jung-Hyun Kim, Jaap S Sinninghe Damsté & Gerhard Fischer
Lipid biomarker records from sinking particles collected by sediment traps are excellent tools to study the seasonality of biomarker production as well as processes of particle formation and settling, ultimately leading to the preservation of the biomarkers in sediments. Here we present records of the biomarker indices UK'37 based on alkenones and TEX86 based on isoprenoid glycerol dialkyl glycerol tetraethers (GDGTs), both used for the reconstruction of sea surface temperatures (SST). These records were obtained...

Initial vegetation, and spore density, diversity and evenness of different arbuscular mycorrhizal fungi morphotaxa 29,36 and 39 months after experimental vegetation removal, central Argentina, supplement to: Urcelay, Carlos; Díaz, Sandra; Gurvich, Diego E; Chapin, F Stuart; Cuevas, Elvira; Domínguez, Laura S (2009): Mycorrhizal community resilience in response to experimental plant functional type removals in a woody ecosystem. Journal of Ecology, 97(6), 1291-1301

Carlos Urcelay, Sandra Díaz, Diego E Gurvich, F Stuart Chapin, Elvira Cuevas & Laura S Domínguez
1. Dominant plant functional types (PFTs) are expected to be primary determinants of communities of other above- and below-ground organisms. Here, we report the effects of the experimental removal of different PFTs on arbuscular mycorrhizal fungi (AMF) communities in a shrubland ecosystem in central Argentina.2. On the basis of the biomass-ratio hypothesis and plant resource use strategy theory, we expected the effect of removal of PFTs on AMF colonization and spores to be proportional to...

Active methane seepage in the Southern Ocean, off the sub-Antarctic island of South Georgia, supplement to: Römer, Miriam; Torres, Marta E; Kasten, Sabine; Kuhn, Gerhard; Graham, Alastair G C; Mau, Susan; Little, Crispin T S; Linse, Katrin; Pape, Thomas; Geprägs, Patrizia; Fischer, David; Wintersteller, Paul; Marcon, Yann; Rethemeyer, Janet; Bohrmann, Gerhard; Shipboard scientific party ANT-XXIX/4 (2014): First evidence of widespread active methane seepage in the Southern Ocean, off the sub-Antarctic island of South Georgia. Earth and Planetary Science Letters, 403, 166-177

Miriam Römer, Marta E Torres, Sabine Kasten, Gerhard Kuhn, Alastair G C Graham, Susan Mau, Crispin T S Little, Katrin Linse, Thomas Pape, Patrizia Geprägs, David Fischer, Paul Wintersteller, Yann Marcon, Janet Rethemeyer, Gerhard Bohrmann &
An extensive submarine cold-seep area was discovered on the northern shelf of South Georgia during R/V Polarstern cruise ANT-XXIX/4 in spring 2013. Hydroacoustic surveys documented the presence of 133 gas bubble emissions, which were restricted to glacially-formed fjords and troughs. Video-based sea floor observations confirmed the sea floor origin of the gas emissions and spatially related microbial mats. Effective methane transport from these emissions into the hydrosphere was proven by relative enrichments of dissolved methane...

C-axis fabric analysis of ice samples collected from the NEEM ice core, supplement to: Eichler, Jan (2013): C-axis analysis of the NEEM ice core - An approach based on Digital Image Processing. Diploma Thesis, Fachbereich Physik, Freie Universität Berlin, 73 pp

Jan Eichler, Ilka Weikusat & Sepp Kipfstuhl
The focus of this Diploma thesis is the development of a new approach for the analysis of crystal orientations in polar ice, based on digital image processing. The c-axes orientations are measured on thin ice sections using automated polarized light microscopy. The measured data are stored in form of high-resolution digital images which have been evaluated only manually so far. The automatic detection of grains and grain boundaries and the extraction of their orientation and...

Fatty acid composition of tissue samples from Arctic walruses (Odobenus rosmarus rosmarus) and their prey, supplement to: Skoglund, Eli G; Lydersen, Christian; Grahl-Nielsen, Otto; Haug, Tore; Kovacs, Kit Maureen (2010): Fatty acid composition of the blubber and dermis of adult male Atlantic walruses (Odobenus rosmarus rosmarus) in Svalbard, and their potential prey. Marine Biology Research, 6(3), 239-250

Eli G Skoglund, Christian Lydersen, Otto Grahl-Nielsen, Tore Haug & Kit Maureen Kovacs
Blubber biopsies were collected from 18 adult male walruses from Svalbard, Norway. The biopsies were taken vertically through the skin and the entire blubber layer down to, but not including, the muscle layer. Fatty acid (FA) compositions of inner blubber, outer blubber and dermis of the walruses and of potential prey organisms were determined. The three layers differed significantly from one another in FA composition. Generally, the inner blubber contained more long-chained monounsaturated, saturated and...

Active layer thickness and ground temperatures during 1991-2008 at permafrost sites in northern North America, supplement to: Smith, S L; Romanovsky, Vladimir E; Lewkowicz, Antoni G; Burn, C R; Allard, Maël; Clow, Gary D; Yoshikawa, Kenji; Throop, J (2010): Thermal state of permafrost in North America: a contribution to the international polar year. Permafrost and Periglacial Processes, 21(2), 117-135

S L Smith, Vladimir E Romanovsky, Antoni G Lewkowicz, C R Burn, Maël Allard, Gary D Clow, Kenji Yoshikawa & J Throop
A snapshot of the thermal state of permafrost in northern North America during the International Polar Year (IPY) was developed using ground temperature data collected from 350 boreholes. More than half these were established during IPY to enhance the network in sparsely monitored regions. The measurement sites span a diverse range of ecoclimatic and geological conditions across the continent and are at various elevations within the Cordillera. The ground temperatures within the discontinuous permafrost zone...

Site characteristics and ice speed at four sites on Kangiata Nunata Sermia glacier, southwest Greenland, supplement to: Sole, Andrew J; Mair, D W F; Nienow, P W; Bartholomew, I D; King, MA; Burke, M J; Joughin, Ian (2011): Seasonal speedup of a Greenland marine-terminating outlet glacier forced by surface melt–induced changes in subglacial hydrology. Journal of Geophysical Research, 116(F3), F03014

Andrew J Sole, D W F Mair, P W Nienow, I D Bartholomew, MA King, M J Burke & Ian Joughin
We present subdaily ice flow measurements at four GPS sites between 36 and 72 km from the margin of a marine-terminating Greenland outlet glacier spanning the 2009 melt season. Our data show that >35 km from the margin, seasonal and shorter-time scale ice flow variations are controlled by surface melt-induced changes in subglacial hydrology. Following the onset of melting at each site, ice motion increased above background for up to 2 months with resultant up-glacier...

Hydrocarbon analyses of submarine mud volcanoes (MV) in the Kumano forearc basin, supplement to: Pape, Thomas; Geprägs, Patrizia; Hammerschmidt, Sebastian; Wintersteller, Paul; Wei, Jiangong; Fleischmann, Timo; Bohrmann, Gerhard; Kopf, Achim J (2014): Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone. Geochemistry, Geophysics, Geosystems, 15(6), 2180-2194

Thomas Pape, Patrizia Geprägs, Sebastian Hammerschmidt, Paul Wintersteller, Jiangong Wei, Timo Fleischmann, Gerhard Bohrmann & Achim J Kopf
Twelve submarine mud volcanoes (MV) in the Kumano forearc basin within the Nankai Trough subduction zone were investigated for hydrocarbon origins and fluid dynamics. Gas hydrates diagnostic for methane concentrations exceeding solubilities were recovered from MVs 2, 4, 5, and 10. Molecular ratios (C1/C2<250) and stable carbon isotopic compositions (d13C-CH4 >-40 per mil V-PDB) indicate that hydrate-bound hydrocarbons (HCs) at MVs 2, 4, and 10 are derived from thermal cracking of organic matter. Considering thermal...

High-resolution in situ seawater temperature in coral reefs of Tayrona National Natural Park, Colombian Caribbean, 2010-2013

Elisa Bayraktarov, Juan Felipe Lazarus, Corvin Eidens, Valeria Pizarro & Christian Wild
The Tayrona National Natural Park (TNNP) is located at the northeastern Colombian coast between 11°17' - 11°22' N and 73°53' - 74°12' W. Despite of its relatively small coastline of only ca. 40 km, TNNP belongs to the most biodiverse areas of the tropical and subtropical Atlantic. Along its rocky coastline with capes, inlets and bays, the TNNP is home to a variety of seagrass beds, mangroves and coral communities. The TNNP region experiences strong...

Stickleback F2 generation transgenerational plasticity experiment: egg and body size data, supplement to: Shama, Lisa N S; Wegner, K Mathias (2014): Grandparental effects in marine sticklebacks: transgenerational plasticity across multiple generations. Journal of Evolutionary Biology, 27(11), 2297-2307

Lisa N S Shama & K Mathias Wegner
Nongenetic inheritance mechanisms such as transgenerational plasticity (TGP) can buffer populations against rapid environmental change such as ocean warming. Yet, little is known about how long these effects persist and whether they are cumulative over generations. Here, we tested for adaptive TGP in response to simulated ocean warming across parental and grandparental generations of marine sticklebacks. Grandparents were acclimated for two months during reproductive conditioning, whereas parents experienced developmental acclimation, allowing us to compare the...

Magnetic properties of maar lake sediments from Otago, New Zealand, supplement to: Fox, Bethany R Storrs; Wartho, Jo-Anne; Wilson, Gary S; Lee, Daphne E; Nelson, Faye E; Kaulfuss, Uwe (2015): Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand. Geochemistry, Geophysics, Geosystems, 16(1), 59-76

Bethany R Storrs Fox, Jo-Anne Wartho, Gary S Wilson, Daphne E Lee, Faye E Nelson & Uwe Kaulfuss
Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits at the base of the cored sedimentary sequence yielded two new 40Ar/39Ar dates of 24.51±0.24 Ma and 23.38±0.24 Ma (2sigma). The younger date agrees within error with a previously published 40Ar/39Ar date of 23.17±0.19 Ma from a basaltic dyke adjacent to the maar crater....

Slope stability analyses based on sediment cores of the Ligurian Margin, Southern France, supplement to: Ai, Fei; Förster, Annika; Stegmann, Sylvia; Kopf, Achim J (2014): Geotechnical Characteristics and Slope Stability Analysis on the Deeper Slope of the Ligurian Margin, Southern France. In: Kyoji Sassa, Paolo Canuti, Yueping Yin (eds.), Landslide Science for a Safer Geoenvironment, Volume 3: Targeted Landslides. Springer International Publishing AG, Switzerland, 549-555

Fei Ai, Annika Förster, Sylvia Stegmann & Achim J Kopf
Submarine slope failures of various types and sizes are common along the tectonic and seismically active Ligurian margin, northwestern Mediterranean Sea, primarily because of seismicity up to ~M6, rapid sediment deposition in the Var fluvial system, and steepness of the continental slope (average 11°). We present geophysical, sedimentological and geotechnical results of two distinct slides in water depth >1,500 m: one located on the flank of the Upper Var Valley called Western Slide (WS), another...

Planktonic foraminifer assemblages and stable oxygen and carbon isotope record of sediment core MD07-3076Q, supplement to: Gottschalk, Julia; Skinner, Luke C; Waelbroeck, Claire (2015): Contribution of seasonal sub-Antarctic surface water variability to millennial-scale changes in atmospheric CO2 over the last deglaciation and Marine Isotope Stage 3. Earth and Planetary Science Letters, 411, 87-99

Julia Gottschalk, Luke C Skinner & Claire Waelbroeck
We report high-resolution planktonic foraminifer census counts and stable oxygen and carbon isotope measurements of the planktonic foraminifera G. bulloides and N. pachyderma s. from sediment core MD07-3076Q for the last deglaciation, the last glacial maximum and Marine Isotope Stage 3. These data provide insights into the marine cycling of carbon and frontal dynamics in the sub-Antarctic Atlantic during the last 68 ka.

Morphological, chemical and physical characteristics of cryosolic soils from Arctic Canada, supplement to: Tarnocai, Charles; Bockheim, James G (2011): Cryosolic soils of Canada: Genesis, distribution, and classification. Canadian Journal of Soil Science, 91(5), 749-762

Charles Tarnocai & James G Bockheim
Cryosols are permafrost-affected soils whose genesis is dominated by cryogenic processes, resulting in unique macromorphologies, micromorphologies, thermal characteristics, and physical and chemical properties. In addition, these soils are carbon sinks, storing high amounts of organic carbon collected for thousands of years. In the Canadian soil classification, the Cryosolic Order includes mineral and organic soils that have both cryogenic properties and permafrost within 1 or 2 m of the soil surface. This soil order is divided...

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