ALBERT

Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise SO276 MerMet 17-6 that took place between 2020-06-22 and 2020-07-26. The data was collected using the ship's own Kongsberg EM 122. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data (zip file) and the cruise report for details. The bathymetric data acquisition was carried out within the IceAge project which aims to investigate the North Atlantic ecosystem. Working areas have been selected to offer a variability of environments (e.g., variability of water depth, and geological setting (shelf, mid-ocean ridge, deep basin)). The bathymetric data were used to plan ROV dives and sampling stations as well as background for habitat mapping studies.

Description: Cell division of the coccolithophore Emiliania huxleyi and other phytoplankton typically becomes entrained to diel light/dark cycles under laboratory conditions, with division occurring primarily during dark phases and production occurring during light phases. Under these conditions, the increase in a culture's cell and biomass concentrations deviates from an exponential function on time scales 〈 24 h. We here present a dataset of short-term changes in cell and biomass concentrations of fast dividing, dilute-batch cultures of E. huxleyi grown under a 16:8 h light/dark cycle. This dataset was used to derive linear models describing the diel course in the concentrations of cells, particulate organic carbon (POC) and particulate inorganic carbon (PIC) and for the calculation of daily means of cellular quotas and production rates in Kottmeier et al. (2020). We also present the given seawater carbonate chemistry as well as cellular quotas of particulate organic nitrogen (PON) and chlorophyll a (Chl. a), and the ratios of PIC:POC, POC:PON, POC:cell volume and Chl. a:POC in the course of the 24 h sampling period.

Description: Abstract

Description: This collection contains 10500 computationally generated, randomised 2D microstructures, their geometrical and electrical properties, and the Matlab software package used to calculate these properties. The two-phase microstructures (mineral matrix, pore space) represent three different pore space types (microfracture networks, intergranular pore space, oomoldic pore space) and are organised into 35 ensembles - with common modelling parameters - of 100 individual microstructure realisations each. For all realisations, several geometrical properties (percolation, total porosity, connected porosity, isolated porosity, surface area, fractal dimension) and physical properties (formation factor from electrical resistivity, electrical tortuosity) are given. The collection also includes a Matlab-based finite element simulation package derived from the FEMALY library, which can be used to compute the properties of any given 2D raster microstructure.

Description: Temperature gradients and in-situ thermal conductivity, measured with the Bremen heat flow probe. There are 21 channels, spaced 0.26 cm.

Description: Field-scale biostimulation and desorption tracer experiments conducted in a uranium (U) contaminated, shallow alluvial aquifer have provided insight into the coupling of microbiology, biogeochemistry, and hydrogeology that control U mobility in the subsurface. Initial experiments successfully tested the concept that Fe-reducing bacteria such as Geobacter sp. could enzymatically reduce soluble U(VI) to insoluble U(IV) during in situ electron donor amendment (Anderson et al., 2003; Williams et al., 2011). In parallel, in situ desorption tracer tests using bicarbonate amendment demonstrated rate-limited U(VI) desorption (Fox et al., 2012). These results and prior laboratory studies underscored the importance of enzymatic U(VI)-reduction and suggested the ability to combine desorption and bioreduction of U(VI). Here we report the results of a new field experiment in which bicarbonate-promoted uranium desorption and acetate amendment were combined and compared to an acetate amendment-only experiment in the same experimental plot. Results confirm that bicarbonate amendment to alluvial aquifer sediments desorbs U(VI) and increases the abundance of Ca-uranyl-carbonato complexes. At the same time, the rate of acetate-promoted enzymatic U(VI) reduction was greater in the presence of added bicarbonate in spite of the increased dominance of Ca-uranyl-carbonato aqueous complexes. A model-simulated peak rate of U(VI) reduction was ~3.8 times higher during acetate-bicarbonate treatment than under acetate-only conditions. Lack of consistent differences in microbial community structure between acetate-bicarbonate and acetate-only treatments suggest that a significantly higher rate of U(VI) reduction in the bicarbonate-impacted sediment may be due to a higher intrinsic rate of microbial reduction induced by elevated concentrations of the bicarbonate oxyanion. The findings indicate that bicarbonate amendment may be useful in improving the engineered bioremediation of uranium in aquifers.

Description: Batyhmetry data based on the KONGSBERG Multibeam system EM120 was recorded during the RV SONNE cruise SO219A (Yokohama-Yokohama). The cruise took place between 08.03.2012 and 06.04.2012 in the Northwestern Pacific (Japan Trench) and was divided into two legs. The main research goal of the cruise was the investigation of the sedimentary fingerprint of the region caused by the 2011 Tohoku-Oki earthquake. Therefore the Remotely Operated Vehicle (ROV) QUEST (MARUM) was used to investigate fault zones and normal fault systems, which might co-seismically moved during the earthquake. Additionally slumps, seeps, and other structures , which might be related to the fault systems and therefore to the earth quake, were further explored using the ship-mounded hydroacoustic equipment (Multibeam and Parasound). CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the RV SONNE cruise SO219A the KONGSBERG EM120 multibeam echosounder with a nominal sounding frequency of 12 kHz was utilized. Up to 191 individual beams are formed for each ping. The seafloor is detected using amplitude and phase information for each beam sounding. The beams could covered a swath width of 150° across track, however due to deficient data quality the maximum swath width during the cruise was only up to 120°/130°. For further information consult https://www.km.kongsberg.com/. Responsible person during this cruise / PI: Christian dos Santos Ferreira (cferreira@marum.de) Chief Scientist: Prof. Dr. Gerold Wefer (gwefer@marum.de) CR: https://elib.suub.uni-bremen.de/edocs/00103574-1.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120100.htm, https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120101.htm A special thanks goes to the following watchkepper during SO219A: Sato, Takeshi, Kanamatsu, Toshiya ; Macron, Yann; Römer, Miriam; Podszun, Lina

Description: Bathymetry data based on multibeam echosounder EM120 was conducted during R/V SONNE cruise SO222 between 09.06.2012 and 30.06.2012 (Leg A) and 04.07.2012 and 18.07.2012 (Leg B) in the Nankai Trough off Japan. The main objective of the cruise was MeBo drilling and long-term monitoring of active mud volcanoes in the northern Kumano Basin, which carry gas hydrates and are overlying an area of high strain. Hydroacoustic work on board aimed at a high spatial coverage of the Kumano Basin and its mud volcanoes. Furthermore, bathymetric mapping revealed additional features in the study area, of which 5 previously unknown mud volcanoes were identified. Additionally, coring with gravity corers and the MeBO drill rig as well as the deployment of CORK observation instruments and an ROV helped to study the activity and products of mud volcanoes in the Kumano Basin. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the SO222 cruise, the hull-mounted KONGSBERG EM120 multibeam ecosounder (MBES) was utilized for bathymetric mapping as it is able to perform in water depths up to 11,000 m. Two transducer arrays transmit acoustic signals of 11.25 to 12.6 kHz in successive emission-reception cycles. 191 overlapping beams in a 2° (TX) by 2° (RX) footprint form each acoustic ping, resulting in a beam width of maximum 150° across track and 2° along track. For further information on the system, consult https://www.km.kongsberg.com/. The depth of the water column is estimated through the two-way-travel time, beam angle and ray bending due to refraction in the water column by sound speed variations. Combining lateral and center beams secures measurement accuracy practically independent of the beam-pointing angle. During the cruise SO222, the MBES and PARASOUND sub-bottom profiler were continuously acquiring data of about 1500 km track lengths. Two sound velocity profiles (SVP) were calculated based on SEABIRD CTD measurements and applied to the MBES, whereas no SVP was available for the southern Kumano Basin due to strong currents. Responsible person during this cruise / PI: Paul Wintersteller (pwintersteller@marum.de) Chief Scientist: Achim Kopf (a.kopf@marum.de) CR: http://elib.suub.uni-bremen.de/edocs/00103543-1.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120280.htm

Description: Batyhmetry data based on the KONGSBERG Multibeam system EM120 was recorded during the RV SONNE cruise SO219A (Yokohama-Yokohama). The cruise took place between 08.03.2012 and 06.04.2012 in the Northwestern Pacific (Japan Trench) and was divided into two legs. The main research goal of the cruise was the investigation of the sedimentary fingerprint of the region caused by the 2011 Tohoku-Oki earthquake. Therefore the Remotely Operated Vehicle (ROV) QUEST (MARUM) was used to investigate fault zones and normal fault systems, which might co-seismically moved during the earthquake. Additionally slumps, seeps, and other structures , which might be related to the fault systems and therefore to the earth quake, were further explored using the ship-mounded hydroacoustic equipment (Multibeam and Parasound). CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the RV SONNE cruise SO219A the KONGSBERG EM120 multibeam echosounder with a nominal sounding frequency of 12 kHz was utilized. Up to 191 individual beams are formed for each ping while the seafloor is detected using amplitude and phase information for each beam sounding. The beams could have covered a swath width of 150° across track, however due to deficient data quality the maximum swath width during the cruise was only up to 120°/130°. For further information consult https://www.km.kongsberg.com/. Responsible person during this cruise / PI: Christian dos Santos Ferreira (cferreira@marum.de) Description of data processing: The open source software MB-System suite (Caress, D.W., and D.N. Chayes, MB-System Version 5.5, open source software distributed from the MBARI and L-DEO web sites, 2000-2012.) was utilized for this purpose. Roll corrections have been applied to the SO219A bathymetry data using a rollbias of -0.11. Using Mbeditviz, artefacts were cleaned manually. NetCDF (GMT) grids of the edited data as well as statistics were created with mbgrid. The published bathymetric grid of the cruise SO219A has a resolution of 100 m. No total propagated uncertainty (TPU) has been calculated to gather vertical or horizontal accuracy. A higher resolution is, at least partly, achievable. The grid extended with _num represents a raster dataset with the statistical number of beams/depths taken into account to create the depth of the cell. The extended _sd -grid contains the standard deviation for each cell. All grids produced are retrievable through the PANGAEA database (www.pangaea.de). Postprocessing and products were conducted by the Seafloor-Imaging & Mapping group of MARUM/FB5, responsible person: Paul Wintersteller (seafloor-imaging@marum.de). Projection: Geographic Coordinate System / WGS84 Chief Scientist: Prof. Dr. Gerold Wefer (gwefer@marum.de) CR: https://elib.suub.uni-bremen.de/edocs/00103574-1.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120100.htm, https://www2.bsh.de/aktdat/dod/fahrtergebnis/2012/20120101.htm Raw data: beim Upload der grids: Link zu den Rohdaten (wenn schon vorhanden) A special thanks goes to the following watchkepper during SO219A: Sato, Takeshi, Kanamatsu, Toshiya