468 Works

Measurements of aerosol and CCN properties in the Mackenzie River delta (Arctic) during RACEPAC, supplement to: Herenz, Paul; Wex, Heike; Henning, Silvia; Bjerring Kristensen, Thomas; Rubach, Florian; Roth, Anja; Borrmann, Stephan; Bozem, Heiko; Schulz, Hannes; Stratmann, Frank (2018): Measurements of aerosol and CCN properties in the Mackenzie River delta (Canadian Arctic) during spring-summer transition in May 2014. Atmospheric Chemistry and Physics, 18(7), 4477-4496

Paul Herenz, Heike Wex, Silvia Henning, Thomas Bjerring Kristensen, Florian Rubach, Anja Roth, Stephan Borrmann, Heiko Bozem, Hannes Schulz & Frank Stratmann
Within the framework of the RACEPAC (Radiation-Aerosol-Cloud Experiment in the Arctic Circle) project, the Arctic aerosol, arriving at a ground-based station in Tuktoyaktuk (Mackenzie River delta area, Canada), was characterized during a period of 3 weeks in May 2014. Basic meteorological parameters and particle number size distributions (PNSDs) were observed and two distinct types of air masses were found. One type were typical Arctic haze air masses, termed accumulation-type air masses, characterized by a monomodal...

Water column characteristics obtained by yoyo-CTD and mooring sensors and benthic organism abundance of a biologically rich seamount of the Mid-Atlantic Ridge, supplement to: van Haren, Hans; Hanz, Ulrike; de Stigter, Henko; Mienis, Furu; Duineveld, Gerard C A (2017): Internal wave turbulence at a biologically rich Mid-Atlantic seamount. PLoS ONE, 12(12), e0189720

Hans van Haren, Ulrike Hanz, Henko de Stigter, Furu Mienis & Gerard C A Duineveld
The turbulence regime near the crest of a biologically rich seamount of the Mid-Atlantic Ridge southwest of the Azores was registered in high spatial and temporal resolution. Internal tides and their higher harmonics dominate the internal wave motions, producing considerable shear-induced turbulent mixing in layers of 10±50 m thickness. This interior mixing of about 100 times open-ocean interior values is observed both at a high-resolution temperature sensor mooring-site at the crest, 770 m water depth...

Physical, biological, biogeochemical, and bathymetric datasets from a research cruise to the Schultz Massif Seamount (Norwegian/Greenland Sea) in June 2016 using RV G.O. Sars (Cruise 2016109A), supplement to: Roberts, Emyr Martyn; Mienis, Furu; Rapp, Hans Tore; Hanz, Ulrike; Meyer, Heidi Kristina; Davies, Andrew John (2018): Oceanographic setting and short-timescale environmental variability at an Arctic seamount sponge ground. Deep Sea Research Part I: Oceanographic Research Papers, 138, 98-113

Emyr Martyn Roberts, Furu Mienis, Hans Tore Rapp, Ulrike Hanz, Heidi Kristina Meyer & Andrew John Davies
This collection contains observational datasets collected during a 2016 research cruise to the Schultz Massif Seamount (Norwegian/Greenland Sea) using RV G.O. Sars (Norwegian Institute of Marine Research and University of Bergen). These consist of conductivity, temperature, and depth (CTD) package profiles, Niskin bottle water sample data (suspended particulate matter (SPM) and nutrients), and benthic lander timeseries data for various oceanographic parameters. Datasets relating to analysis of a remotely operated vehicle (ROV Aegir 6000, University of...

Environmental characteristics and E. huxleyi coccoliths mass and morphology in the Mediterranean Sea during MedSeA and Meteor M84/3 cruises (May 2013, April 2011), supplement to: D'Amario, Barbara; Ziveri, Patrizia; Grelaud, Michaël; Oviedo, Angela Maria (2018): Emiliania huxleyi coccolith calcite mass modulation by morphological changes and ecology in the Mediterranean Sea. PLoS ONE, 13(7), e0201161

Barbara D'Amario, Patrizia Ziveri, Michaël Grelaud & Angela Maria Oviedo
To understand the response of marine calcifying organisms under high CO2 scenarios, it is critical to study their calcification patterns in the natural environment. This paper focuses on a major calcifying phytoplankton group, the coccolithophores, through the interpretation of water samples collected along a W-E Mediterranean transect during two research cruises, in April 2011 (Meteor cruise M84/3) and May 2013 (MedSeA cruise 2013). The Mediterranean Sea is a marginal sea characterized by large biogeochemical gradients....

Latest Cretaceous to early Eocene nannofossil of ODP Site 198-1209, supplement to: Alvarez, Sarah; Gibbs, Samantha J; Bown, Paul R; Kim, Hojung; Sheward, Rosie M; Ridgwell, Andy (2019): Diversity decoupled from ecosystem function and resilience during mass extinction recovery. Nature, 574(7777), 242-245

Sarah Alvarez, Samantha J Gibbs, Paul R Bown, Hojung Kim, Rosie M Sheward & Andy Ridgwell
The Chicxulub bolide impact 66 million years ago drove the near-instantaneous collapse of ocean ecosystems. The devastating loss of diversity at the base of ocean food webs probably triggered cascading extinctions across all trophic levels and caused severe disruption of the biogeochemical functions of the ocean, and especially disrupted the cycling of carbon between the surface and deep sea. The absence of sufficiently detailed biotic data that span the post-extinction interval has limited our understanding...

Sedimentology of profile PS1824 at Gunnerus Ridge, Antarctica, supplement to: Maus, Bastian (1993): Plio-Pleistozäne Sedimentation im Randbereich des Ritscher-Canyons, westlich des Gunnerus-Rückens (Ostantarktis). Diploma Thesis, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven & Universität Freiburg, 123 pp

Bastian Maus
Das untersuchte Sedimentmaterial stammt aus dem westlich des Gunnerus-Rückens liegenden Tiefseebereich des Riiser-Larsenmeeres aus ca. 4480 m Wassertiefe. An den unverfestigten Sedimentkernproben eines etwa 13,40 m langen Schwerelotes (PS1824-1) und eines ca. 50 cm langen Großkastengreifers (PS1824-2) wurden umfangreiche sedimentphysikalische und sedimentologische Untersuchungsmethoden angewandt. Neben zerstörungsfreien, sedimentphysikalischen Messungen zur Ermittlung von Suszeptibilität, elektrischen Widerstand, P-Wellengeschwindigkeit und Feuchtraumdichte, wurden unter anderem die Korngrößenverteilung, der Karbonat- und Corg-Gehalt sowie die Komponentenverteilung der Sandfraktion bestimmt. Die zeitliche Einstufung...

Master tracks in different resolutions during POLAR 6 campaign EGRIP_NOR_2018

Tobias Binder & Olaf Eisen
This dataset was created via processing of raw position data acquired by the GPS sensor for scientific equipment on Polar 6/Polar 5 to receive a validated master track which is used as reference of further expedition data.

n-Alkanes and compound-specific isotopes in the Orange River system, supplement to: Burdanowitz, Nicole; Dupont, Lydie M; Zabel, Matthias; Schefuß, Enno (2018): Holocene hydrologic and vegetation developments in the Orange River catchment (South Africa) and their controls. The Holocene, 28(8), 1288-1300

Nicole Burdanowitz, Lydie M Dupont, Matthias Zabel & Enno Schefuß
The summer rainfall zone (SRZ) in the South African interior experienced pronounced hydrological and vegetation changes during the Holocene inferred to be driven mainly by shifts in atmospheric and oceanic circulations systems. The exact mechanisms controlling these changes are still debated. To gain better insights into the Holocene environmental changes in the South African SRZ and their driving factors, we analysed compound-specific carbon and hydrogen isotopes of plant wax n-alkanes (δ13Cwax and δDwax) from a...

Results of nodule detection along AUV tracks during SONNE cruises SO239 and SO242/1

Timm Schoening
Images were acquired by the DeepSurvey Camera on board GEOMAR's AUV Abyss. Nodules were delineated by the CoMoNoD algorithm [see related to references]. Result files are computed per AUV dive. Nodule detections below 5cm^2 are neglected as are detections above 707cm^2. Abundance statistics are computed per m^2 and gridded per m^2 as well. For overlapping images, max-pooling has been applied to select the values reported in the result files. Pixel values in the rendered maps...

Remote sensing quantifies widespread abundance of permafrost region disturbances across the Arctic and Subarctic, Datasets, supplement to: Nitze, Ingmar; Grosse, Guido; Jones, Benjamin M; Romanovsky, Vladimir E; Boike, Julia (2018): Remote sensing quantifies widespread abundance of permafrost region disturbances across the Arctic and Subarctic. Nature Communications, 9(1)

Ingmar Nitze, Guido Grosse, Benjamin M Jones, Vladimir E Romanovsky & Julia Boike
Here we quantify the abundance and distribution of three primary permafrost region disturbances (PRD; lakes and their dynamics, wildfires, retrogressive thaw slumps) using trend analysis of 30-m resolution Landsat imagery from 1999-2014 and auxiliary datasets. The dataset spans four continental-scale transects in North America (Alaska, Eastern Canada) and Eurasia (Western Siberia, Eastern Siberia), covering 2.3M km² or ~10% of the permafrost region. This data publication contains geospatial vector files (polygons) of the perimeters of PRD.The...

Sedimentological, biogeochemical and geochronological data of yedoma and thermokarst deposits in West-Alaska, supplement to: Jongejans, Loeka Laura; Strauss, Jens; Lenz, Josefine; Peterse, Francien; Mangelsdorf, Kai; Fuchs, Matthias; Grosse, Guido (2018): Organic matter characteristics in yedoma and thermokarst deposits on Baldwin Peninsula, west Alaska. Biogeosciences, 15(20), 6033-6048

Loeka Laura Jongejans, Jens Strauss, Josefine Lenz, Francien Peterse, Kai Mangelsdorf, Matthias Fuchs & Guido Grosse
These datasets describe samples taken from yedoma and thermokarst deposits in Baldwin Peninsula (BAL), West-Alaska. Five locations were sampled: a yedoma exposure (B2), three drained thermokarst lake basin (DTLB) exposures (B2, B3 and B4) and a thermokarst lake (UPL1-L1). The collection and analysis of the samples are described in Jongejans et al. (in review). The first four datasets include sampling dates, type of environment (active layer, permafrost or thermokarst lake), site coordinates and the depth...

Morphometric study of porosity and morphology of fossil Globigerinoides, during the Late Oligocene and Early Pliocene. Implications for the construction of a climatic and environmental paleoproxy, supplement to: Constandache, Monica (2017): Morphometric study of porosity and morphology of fossil Globigerinoides, during the Late Oligocene and Early Pliocene. Implications for the construction of a climatic and environmental paleoproxy. Dissertation, University of Fribourg, Switzerland, 163 pp

Monica Constandache
Globigerinoides is a group of planktonic foraminifera who appeared in the world's oceans around the Late Oligocene and are still largely present in the equatorial, tropical and subtropical regions of the modern Ocean. Several proposals of phylogeny have been presented since their discovery by d'Orbigny (1839), without reaching a consensus. Recent molecular studies have revealed an unexpectedly great and sometimes cryptic complexity, which further complicates the relationships between species of this genus. As a complementary...

Late Miocene alkenone unsaturation data, age models, and regional stacks of alkenones, supplement to: Herbert, Timothy D; Lawrence, Kira T; Tzanova, Alexandrina; Peterson, Laura C; Caballero-Gill, Rocio P; Kelly, Christopher S (2016): Late Miocene global cooling and the rise of modern ecosystems. Nature Geoscience, 9(11), 843-847

Timothy D Herbert, Kira T Lawrence, Alexandrina Tzanova, Laura C Peterson, Rocio P Caballero-Gill & Christopher S Kelly
During the late Miocene epoch, about seven million years ago, large areas of the continents experienced drying, enhanced seasonality, and a restructuring of terrestrial plant and animal communities. These changes are seen throughout the subtropics, but have typically been attributed to regional tectonic forcing. Here we present a set of globally distributed sea surface temperature records spanning the past 12 million years based on the alkenone unsaturation method. We find that a sustained late Miocene...

Surface and subsurface single foraminifera analyses from the Western Pacific Warm Pool over the Plio-Pleistocene, supplement to: Ford, Heather L; Ravelo, Ana Christina (2019): Estimates of Pliocene Tropical Pacific Temperature Sensitivity to Radiative Greenhouse Gas Forcing. Paleoceanography and Paleoclimatology, 34(1), 2-15

Heather L Ford & Ana Christina Ravelo
The Western Equatorial Pacific (WEP) warm pool, with surface temperatures >28 °C and a relatively deep thermocline, is an important source of latent and sensible heat for the global climate system. Because the tropics are not sensitive to ice‐albedo feedbacks, the WEP's response to radiative forcing can be used to constrain a minimum estimate of Earth system sensitivity. Climate modeling of pCO2‐radiative warming projections shows little change in WEP variability; here we use temperature distributions...

Tidal notches on Bonaire and coral dating of BON-39-A, supplement to: Lorscheid, Thomas; Felis, Thomas; Stocchi, Paolo; Obert, J Christina; Scholz, Denis; Rovere, Alessio (2017): Tides in the Last Interglacial: insights from notch geometry and palaeo tidal models in Bonaire, Netherland Antilles. Scientific Reports, 7(1)

Thomas Lorscheid, Thomas Felis, Paolo Stocchi, J Christina Obert, Denis Scholz & Alessio Rovere
The study of past sea levels relies largely on the interpretation of sea-level indicators. Palaeo tidal notches are considered as one of the most precise sea-level indicators as their formation is closely tied to the local tidal range. We present geometric measurements of modern and palaeo (Marine Isotope Stage (MIS) 5e) tidal notches on Bonaire (southern Caribbean Sea) and results from two tidal simulations, using the present-day bathymetry and a palaeo-bathymetry. We use these two...

Particle microenvironments expand the niche of anaerobic metabolism in the ocean, supplement to: Bianchi, Daniele; Weber, Thomas; Kiko, Rainer; Deutsch, Curtis (2018): Global niche of marine anaerobic metabolisms expanded by particle microenvironments. Nature Geoscience, 11(4), 263-268

Daniele Bianchi, Thomas Weber, Rainer Kiko & Curtis Deutsch
In ocean waters, anaerobic microbial respiration should be confined to the anoxic waters found in coastal regions and tropical oxygen minimum zones, where it is energetically favourable. However, recent molecular and geochemical evidence has pointed to a much broader distribution of denitrifying and sulfate-reducing microbes. Anaerobic metabolisms are thought to thrive in microenvironments that develop inside sinking organic aggregates, but the global distribution and geochemical significance of these microenvironments is poorly understood. Here, we develop...

Microsatellite markers and ITS sequences to investigate Usnea antarctica and U. aurantiacoatra species pair

Elisa Lagostina
Lichens are symbiotic associations consisting of a fungal (mycobiont) and one or more photosynthetic (photobionts) partners and are the dominant component, and most important primary producers, of Antarctic terrestrial ecosystems. The most common lichens in the maritime Antarctic are Usnea antarctica and U. aurantiacoatra, a so-called "species pair" in which U. antarctica shows asexual reproduction and propagation via soredia and U. aurantiacoatra forms ascospores in apothecia. Previous molecular analyses were not able to unambiguously distinguish...

Vertical profiles of current velocity, suspended sediment concentration, and salinity during one tidal cycle at Jemgum, Ems estuary, Germany, supplement to: Becker, Marius; Maushake, Christian; Winter, Christian (2018): Observations of mud-induced periodic stratification in a hyperturbid estuary. Geophysical Research Letters, 45(11), 5461-5469

Marius Becker, Christian Maushake & Christian Winter
Stationary ship-based data were collected during a period of 19 h, beginning 2014-19-11 16:20:00 CET (UTC +1), in the tidal river part of the Ems estuary, Germany. The ship was moored next to the navigation channel at Jemgum (N53.271114° E07.397424°). Current velocity data was obtained by an ADCP (acoustic Doppler current profiler, RDI 600 kHz, ping rate 0.5 Hz, cell size 0.2 m, 8 pings per ensemble, mode 1), deployed on a floating platform next...

Magnesium and Strontium compositions of pore fluids and bulk carbonates from Ocean Drilling Project Site 189-1171, supplement to: Chanda, Piyali; Fantle, Matthew S (2017): Quantifying the effect of diagenetic recrystallization on the Mg isotopic composition of marine carbonates. Geochimica et Cosmochimica Acta, 204, 219-239

Piyali Chanda & Matthew S Fantle
The Mg and Sr isotopic compositions (d26Mg and87Sr/86Sr) of pore fluids and bulk carbonates from Ocean Drilling Project Site 1171 is located on the South Tasman Rise (48°29.996000S and 149°06.690100E) at a present-day waterdepth of 2148.2 m on a southwesterly dipping slope.

Biogeochemical investigation of Basiluzzo CO2 vents (Panarea, Italy) during ECO2 cruises from 2011-2013, supplement to: Molari, Massimiliano; Guilini, Katja; Lott, Christian; Weber, Miriam; de Beer, Dirk; Meyer, Stefanie; Ramette, Alban; Wegener, Gunter; Wenzhöfer, Frank; Martin, Daniel; Cibic, Tamara; De Vittor, Cinzia; Vanreusel, Ann; Boetius, Antje (2018): CO2 leakage alters biogeochemical and ecological functions of submarine sands. Science Advances, 4(2), eaao2040

Massimiliano Molari, Katja Guilini, Christian Lott, Miriam Weber, Dirk de Beer, Stefanie Meyer, Alban Ramette, Frank Wenzhöfer, Daniel Martin, Ann Vanreusel, Boris Unger, Matthias Schneider, Hanna Kuhfuss & Antje Boetius
Subseabed CO2 storage is considered a future climate change mitigation technology. We investigated the ecological consequences of CO2 leakage for a marine benthic ecosystem. For the first time with a multidisciplinary integrated study, we tested hypotheses derived from a meta-analysis of previous experimental and in situ high-CO2 impact studies. For this, we compared ecological functions of naturally CO2-vented seafloor off the Mediterranean island Panarea (Tyrrhenian Sea, Italy) to those of nonvented sands, with a focus...

High Resolution Underway Nitrous Oxide Measurements (atmosphere and ocean) during Maria S. Merian cruise MSM18/2 and MSM18/3, supplement to: Arévalo-Martínez, Damian L; Kock, Annette; Steinhoff, T; Brandt, Peter; Dengler, Marcus; Fischer, Tim; Körtzinger, Arne; Bange, Hermann Werner (2017): Nitrous oxide during the onset of the Atlantic cold tongue. Journal of Geophysical Research: Oceans, 122(1), 171-184

Damian L Arévalo-Martínez, Annette Kock, T Steinhoff, Peter Brandt, Marcus Dengler, Tim Fischer, Arne Körtzinger & Hermann Werner Bange
Based on a detailed investigation of the distribution and sea-to-air fluxes of N2O in the eastern equatorial Atlantic (EEA), we show that the onset and seasonal development of the ACT can be clearly observed in surface N2O concentrations, which increase progressively as the cooling in the equatorial region proceeds during spring-summer. We observed a strong influence of the surface currents of the EEA on the N2O distribution, which allowed identifying “high” and “low” concentration regimes...

Dissolved rare earth elements and neodymium isotopes from water samples during METEOR cruise M90, supplement to: Grasse, Patricia; Bosse, Michael; Hathorne, Ed C; Böning, Philipp; Pahnke, Katharina; Frank, Martin (2017): Short-term variability of dissolved rare earth elements and neodymium isotopes in the entire water column of the Panama Basin. Earth and Planetary Science Letters, 475, 242-253

Patricia Grasse & Martin Frank
The distribution of dissolved rare earth elements (REEs) and neodymium isotopes (εNd) in the open ocean traces water mass mixing and provides information on lithogenic inputs to the source regions of the water masses. However, the processes influencing the REE budget at the ocean margins, in particular source and sink mechanisms, are not yet well quantified. In this study the first dissolved REE concentrations and Nd isotope compositions of seawater from the Panama Basin (RV...

A Late Quaternary climate record based on long chain diol proxies from ODP Site 202-1234, supplement to: de Bar, Marijke W; Stolwijk, Dave; McManus, Jerry F; Sinninghe Damsté, Jaap S; Schouten, Stefan (2018): A Late Quaternary climate record based on long-chain diol proxies from the Chilean margin. Climate of the Past, 14(11), 1783-1803

Marijke W de Bar, Dave Stolwijk, Jerry F McManus, Jaap S Sinninghe Damsté & Stefan Schouten
In this study we have applied different indices based on long chain diols, i.e., the Long chain Diol Index (LDI) as proxy for past SST, the Diol Index as indicator of past upwelling conditions and the Nutrient Diol Index (NDI) as proxy for nitrate and phosphate concentrations in seawater. The proxies were analyzed in marine sediments recovered at ODP Site 1234, located within the Peru-Chile upwelling system, with a 2 kyr resolution, covering the last...

Stable oxygen isotopes and Mg/Ca in planktic foraminifera and water column data from the Western Pacific Warm Pool, supplement to: Hollstein, Martina; Mohtadi, Mahyar; Rosenthal, Yair; Moffa-Sanchez, Paola; Oppo, Delia W; Martínez Méndez, Gema; Steinke, Stephan; Hebbeln, Dierk (2017): Stable Oxygen Isotopes and Mg/Ca in Planktic Foraminifera From Modern Surface Sediments of the Western Pacific Warm Pool: Implications for Thermocline Reconstructions. Paleoceanography, 32(11), 1174-1194

Martina Hollstein, Mahyar Mohtadi, Yair Rosenthal, Paola Moffa-Sanchez, Delia W Oppo, Gema Martínez Méndez, Stephan Steinke & Dierk Hebbeln
Mg/Ca and stable oxygen isotope compositions (d18O) of planktic foraminifera tests are commonly used as proxies to reconstruct past ocean conditions including variations in the vertical water column structure. Accurate proxy calibrations require thorough regional studies, since parameters such as calcification depth and temperature of planktic foraminifera depend on local environmental conditions. Here we present radiocarbon-dated, modern surface sediment samples and water column data (temperature, salinity, and seawater d18O) from the Western Pacific Warm Pool....

Astronomical tunings of the Oligocene-Miocene Transition from IODP Site 320-U1334, supplement to: Beddow, Helen M; Liebrand, Diederik; Wilson, Douglas S; Hilgen, Frederik J; Sluijs, Appy; Wade, Bridget S; Lourens, Lucas Joost (2018): Astronomical tunings of the Oligocene-Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle. Climate of the Past, 14(3), 255-270

Helen M Beddow, Diederik Liebrand, Douglas S Wilson, Frederik J Hilgen, Appy Sluijs, Bridget S Wade & Lucas Joost Lourens
Astronomical tuning of sediment sequences requires both unambiguous cycle-pattern recognition in climate proxy records and astronomical solutions, and independent information about the phase relationship between these two. Here we present two different astronomically tuned age models for the Oligocene-Miocene Transition (OMT) from Integrated Ocean Drilling Program Site U1334 (equatorial Pacific Ocean) to assess the effect tuning has on astronomically calibrated ages and the geologic time scale. These alternative age models (from ~22 to ~24 Ma)...

Registration Year

  • 2018
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  • Collection
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Affiliations

  • University of Iowa
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