458 Works

Benthic bacterial communities in coastal sandy sediments (Isfjorden, Svalbard)

Katrin Knittel, Sebastian Miksch, Gunter Wegener & Mirja Meiners
Coastal sands are biocatalytic filters for dissolved and particulate organic matter of marine and terrestrial origin. In this study, we accessed the variability of benthic bacterial communities over two annual cycles in Isfjorden (Svalbard, 78°N) sediments, where primary production does not occur during winter. Sandy sediment samples were obtained with a Van Veen grab. Benthic community structure in surface sediments (0-2 cm depth) was studied on the level of cell counts (DAPI staining, CARD-FISH) and...

Grazing experiments with Oxyrrhis marina and coccolithophores

Mathias Haunost, Ulf Riebesell, Francesco D'Amore, Ole Kelting & Lennart Thomas Bach
In laboratory culture experiments, calcified and decalcified coccolithophore cells were offered as prey to a phagotrophic predator, both in separate pure cultures with calcified or decalcified cells only, and in mixed cultures that contained both cell types. Overall, three experiments were conducted, each with a different coccolithophore species. The prey and predator concentrations were monitored over the course of each experiment by flow cytometry and microscopic counting.

Homogeneous global solar radiation data set for 16 ground-based stations located in Poland for the period 1991-2015

Kinga Kulesza & Jedrzej S Bojanowski
Ground-based measurements of global solar radiation are often subject to various errors which are very difficult to detect. This is why quality control procedures and homogenisation of data are essential and should be performed prior to further analyses. We present homogeneous global solar radiation data set, without any gaps, for 16 ground-based stations located in Poland for the period 1991-2015. The data set was prepared with a modification of bias-based quality control (BQC) method (developed...

SFB754 Zooplankton respiration and ammonium excretion

Rainer Kiko, Helena Hauss & Hela Mehrtens
Zooplankton metabolic rates (oxygen respiration and ammonium excretion) at different temperatures, oxygen, and carbon dioxide partial pressures (Kiko et al., 2015; 2016) were measured during three cruises. Zooplankton was collected by different nets and the entire catch immediately transferred to 10 l beakers containing pre-cooled seawater. Diel vertical migrators were sampled at the surface at night. Individuals for respiration rate measurements were isolated immediately and maintained in filtered seawater for 1 to 13 hours at...

Physical oceanography during G. O. Sars cruise GS2018108 to an Arctic deep-sea sponge ground in 2018

Ulrike Hanz
Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along CTD transects and a lander was deployed within the sponge ground that recorded near-bottom physical properties as...

Mg/Ca and oxygen isotope data from the Indo-Pacific

Sindia M Sosdian & Caroline H Lear
Across the middle Miocene, Earth's climate underwent a major cooling and expansion of the Antarctic ice sheet. However, the associated response and development of the tropical climate system is not fully understood, in part because this is influenced by both global climate and also low latitude tectonic gateways and paleoceanography. Here we use combined δ18O and Mg/Ca of planktic foraminifera to reconstruct the thermal history and changes in hydrology from the Indo-Pacific region from 16.5...

SFB754 Thermosalinograph (TSG) measurements

Gerd Krahmann & Hela Mehrtens
For 32 SFB 754 cruises near surface temperatures and salinities were collected using the ships' thermosalinograph systems.The four ships on which the major cruises were conducted were equipped with different systems with either one or two 195 thermosalinographs in parallel or in alternating operating mode (see Table C9). All TSG data were cross-calibrated againstthe calibrated CTD data at the depth of the seawater intake for the TSG systems.

Sediment elemental chemistry, magnetic susceptibility, isothermal remanent magnetization, and age model from NGHP-01 Sites 10 and 16 (offshore Krishna-Godavari Basin, Bay of Bengal)

Stephen C Phillips & Joel Johnson
We present datasets associated with an approach to disentangle detrital and diagenetic influences on magnetic susceptibility in marine sediments in the Bay of Bengal. The goal of the approach is to identify zones in which titanomagnetite has been subject to dissolution and resulting in pyrite precipitation at paleo depths of the sulfate-methane transition zone (SMTZ) or paleo-seep activity. These data are from two sites with cores recovered during the Indian National Gas Hydrate Program Expedition...

SFB754 Nitrogen and carbon fixation and N-cycle gene abundance

Carolin R Löscher & Hela Mehrtens
Dinitrogen (N2) and carbon (C) fixation rates were measured on 9 cruises (see Table C17) using shipboard incubation experiments, complemented with nutrient and oxygen manipulations. During cruises M77/3, M77/4 and M80/2, N2 fixation was measured using the bubble addition method following Montoya et al (1996). During M80/2 a novel method based on360 15N2 gas pre-dissolution, which was developed by Mohr et al. (2010), was tested in parallel to the classic method. An underestimation of N2...

Heat flow data of RV SONNE cruise SO247

Norbert E Kaul
We used the 6 m long Bremen heat flow probe also called Giant Heat Flow Probe (GHF). The heat probe is constructed in the classical “violin bow” design (Hyndman et al., 1979; Hartmann and Villinger, 2002, Villinger et al., 2010), with 21 thermistors distributed over an active length of 5.2 m in 0.26 m intervals mounted inside an oil filled hydraulic tube (O.D. 14 mm) which is attached to the strength member (O.D. 130 mm)....

GNSS Data collected at Priestley Glacier November 2018

Reinhard Drews, Christian T Wild, Oliver Marsh, Wolfgang Rack, Todd A Ehlers, Niklas Neckel & Veit Helm
This is GNSS data of four stations covering the grounding zone of Priestley Glacier Antarctica.Tidal modulation of ice streams and their adjacent ice shelves is a real-world experiment to understand ice-dynamic processes. We observe the dynamics of Priestley Glacier, Antarctica, using Terrestrial Radar Interferometry (TRI) and GNSS. Ocean tides are predominantly diurnal but horizontal GNSS displacements oscillate also semi-diurnally. The oscillations are strongest in the ice shelf and tidal signatures decay near-linearly in the TRI...

Middle to late Eocene carbonate accumulation rates in the Pacific, Atlantic, Indian, and Southern Oceans

Chiara Borrelli, Miriam E Katz & J Robbie Toggweiler
Sedimentary records from the equatorial Pacific show that the deepening of the carbonate compensation depth (depth below which the calcium carbonate flux to the seafloor is balanced by dissolution) at the Eocene/Oligocene boundary (~33.9 Ma) was preceded by several episodes of high and low carbonate accumulation rates. However, data from other basins are scarce. Here, we report middle-late Eocene carbonate accumulation rates from sites located in the Pacific, Atlantic, Indian, and Southern Oceans. Our results...

Dissolved methane concentrations and oxidation rates in the Lena Delta area, 2016-2018

Ingeborg Bussmann, Irina V Fedorova, Bennet Juhls, Pier Paul Overduin & Matthias Winkel
Concentrations of dissolved methane were determined in the Lena River, a permafrost lake and in Tiksi Bay, from 2016-2018, in summer and under ice. In addition in winter 2017, also the concentration in the ice cores was determined (Magen et al. 2014). For the winter 2017 samples, also the methane oxidation rate was determined with a radiotracer method (Bussmann et al. 2015).

Sedimentology on various cores from the South Atlantic

Gerhard Bohrmann & Gerhard Kuhn

Lowered Acoustic Doppler Current Profiler (LADCP) backscatter attached to the rosette sampler during the Malaspina Circumnavigation Expedition

Eugenio Fraile-Nuez & Santiago Hernández-León
As a proxy for zooplankton and micronekton biomass in the water column, acoustic backscatter intensity (dB), acquired using a Lowered Acoustic Doppler Current Profiler (LADCP) down to ca. 4000 m depth along the Malaspina Expedition (CSD2008-00077). Datasets are from 7 different legs around the World (1-7): 1 Spain-Brazil, 2 Brazil-South Africa, 3 South Africa-West Australia, 4 West Australia-East Australia, 5 East Australia-Hawaii, 6 Hawaii-Panamá, 7 Panamá-Spain.

Remote sensing event campaign with various optical and thermal sensors for soil moisture and evapotranspiration derivation in Central Germany investigating possible effects of different spatial scales

Corinna Rebmann, Angela Lausch, Gundula Schulz, Sabine Chabrillat, Robert Milewski, Martin Schrön, Ulrike Werban, Marco Pohle, Andreas Schmidt, Felix Pohl, Floris Hermanns, Sophie Steigerwald, Helko Kotas, Sebastian Gimper, Patrick Schmidt, Andreas Schoßland, Steffen Lehmann & Claudia Schütze
The heat waves and droughts of 2018 / 2019 and in 2020 have had a devastating impact on the functioning of ecosystems and have led to an increasing vulnerability beyond the duration of heat waves (e.g. degradation and increased erosion, reduced carbon uptake by vegetation, modulated energy balance). Such impacts also include loss of agricultural production. A better understanding of the progression and the consequences of heatwaves and droughts is essential for the development and...

SFB754 Dissolved organic matter, cell abundance, extracellular enzyme rates, and bacterial production

Anja Engel, Alexandra Loginova, Marie Maßmig & Hela Mehrtens
Dissolved Organic Matter, Cell Abundance and Extracellular Enzyme Rates and Bacterial Production from several cruises and experiments from 2008-2018

Extension of the stable oxygen isotope and density profile of the ngt27C94.2 (B21) firn core

Johannes Freitag, Sepp Kipfstuhl, Stefanie Weißbach, Nanna Bjørnholt Karlsson, Thomas Münch & Maria Hörhold
The firn core array of the North Greenland Traverse (NGT) provides unique climatic information for North Greenland until the mid 1990ies. In order to extend this climate record into more recent time, some of the drill sites were revisited and extension cores were drilled. The record is a composite of snow liners (from the surface to 1.38 m depth) and a consecutive firn core from 1.38 m depth to 30.64 m depth with a diameter...

Paleomagnetic and mineral magnetic data of the loess paleosol record Balta Alba Kurgan, Romania

Stephanie Scheidt, Ulrich Hambach, Christian Laag & Florian Monnens
The site Balta Alba Kurgan (BAK) in Romania was studied in the frame of a multi-method dating approach, including optical stimulated luminescence, radiocarbon dating, magnetic stratigraphy and tephrochronology. Here, we present the results of the magnetic stratigraphy approach. Oriented samples obtained from the sub-sections BAK2 and BAK4 were combined to the BAK pmag composite profile by the use of variations of the magnetic susceptibility. In order to obtain age control, variations of the magnetic susceptibility...

Labidura riparia microsatellite raw data and historical occurrence records in Germany

Walter Durka, Mareike Gueth & Gerhard Wiegleb
Background Open cast lignite mines, sand pits and military training areas represent human-made, secondary habitats for specialized xerothermophilous and psammophilous species. Rare species, including the earwig Labidura riparia, are found in high population densities in such sites. However, it is unknown from which sources colonisation took place and how genetic variation compares to that of ancient populations on natural sites. Methods Using nine microsatellite markers, we analysed genetic variation and population structure of L. riparia...

Acoustic Doppler Current Profiler (ADCP) data of sites GeoB22716-1, GeoB22717-1 and GeoB22732-1 during RV SONNE cruise SO260/1 and rock descriptions

Graziella Bozzano, Michele Baqués, Tilmann Schwenk & Sabine Kasten
This data set include (1) the detailed petrographic description of the diagnostic rock types used to infer the source areas of the material recovered from the Mar del Plata Canyon area (Western South Atlantic at 38° S) at Sites GeoB13830, GeoB22712, GeoB22717 and L45; and (2) the Acoustic Doppler Current Profiler (ADCP) data obtained from Sites GeoB22716, GeoB22717 and GeoB22732.A variety of gravel- to cobble-sized rocks, recovered from the Mar del Plata Canyon area and...

Physical properties and XRF scanner data of sediment cores TG-01 and TG-03, Ona Basin, southwestern Scotia Sea (Antarctica)

Adrián López-Quirós, Francisco J Lobo, Meghan Duffy, Amy Leventer, Dimitris Evangelinos, Carlota Escutia & Fernando Bohoyo
During expedition SCAN 2013, two gravity cores were collected in the Ona High slope, central Ona Basin, NE prolongation of the Antarctic Peninsula. Core TG-01 is 400 cm long and was collected from 2160 m water depth at 60º22'23.9314''S, 53º02'15.2501''W; core TG-03 is 295 cm long and was obtained from 2789 m water depth at 60º11'23.4003''S, 53º10'49.0810''W. Non-destructive analyses (i.e., physical properties measurements and X-ray fluorescence scanning) were performed on the archive halves. Both, physical...

SFB754 UCTD and rapidcast data

Gerd Krahmann & Hela Mehrtens
During the second funding phase (2012-2015) a new CTD system became available that could be deployed from a moving 185 ship. First a Teledyne Oceanscience UCTD and later a Teledyne Oceanscience Rapidcast system were acquired and deployed successfully on several cruises (see Table C8). They allowed for the sampling of water masses at high horizontal resolution (ranging from less than 1 km for the Rapidcast system to 10 km for deep UCTD casts) with good...

SFB754 Stable and radiogenic isotope measurements

Patricia Grasse & Hela Mehrtens
Seawater samples for stable isotopes measurements of dissolved silicate (δ30Si), nitrate (δ15NO3-) and nitrite (δ15NO2-) were taken from the CTD/rosette on a number of SFB 754 cruises.Seawater samples for Rare Earth Element (REE) concentrations and neodymium (Nd) isotopes were taken during M77/3, M77/4 (Grasse et al., 2012) and during M90 in the Panama Basin (Grasse et al., 2017).

A multi-proxy record of IODP Site 341-U1417

Juliane Müller, Oscar E Romero, Ellen A Cowan, Erin L McClymont, Matthias Forwick, Hirofumi Asahi, Christian März, Christopher M Moy, Itsuki Suto, Alan C Mix & Joseph S Stoner
By means of a multiproxy data set combining biomarker (alkenones, n-alkanes), microfossil (diatoms) and sedimentological (ice rafted debris, XRF) data obtained from sediments from IODP Site U1417 in the Gulf of Alaska, we elucidate the paleoenvironmental setting in this area during the Mid Pleistocene Transition. The data point to a stimulation of the marine primary productivity through the input of nutrients (e.g. iron) via aeolian dust and icebergs. These fertilization pulses were likely triggered by...

Registration Year

  • 2021

Resource Types

  • Collection


  • Alfred Wegener Institute - Wadden Sea Station Sylt
  • University of Iowa
  • Naturhistorisches Museum Basel