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Salinity, temperature, pH, and fluorescent dissolved organic matter (fDOM) measurements in surface waters within DynaCom experimental islands and saltmarsh enclosed plots at different elevation levels, Spiekeroog, Germany, 2018-08 to 2022-01
No full textData were collected between August 2018 and January 2022 as part of the research unit DynaCom (Spatial community ecology in highly dynamic landscapes: From island biogeography to metaecosystems) of the Universities of Oldenburg, Göttingen, and Münster, the iDiv Leipzig and the Nationalpark Niedersächsisches Wattenmeer. Measurements were conducted almost bi-/monthly on experimental islands and salt marsh enclosed plots located in the back barrier tidal flat and salt marsh of the island of Spiekeroog (Germany). Field-based in situ measurements of salinity, temperature, and pH were conducted using portable hand-held instruments in groundwater (filter tubes within experimental plots) and in surface waters from a tidal channel (ITC) adjacent to the experimental islands and a tidal pond (STP) in the pioneer zone of the salt marsh. Measurements were performed and samples were taken during the day between 3 hours before and 3 hours after low tide. From August 2018 to September 2019 a HQ40D digital two-channel multi meter equipped with a pre-calibrated Intellical CDC401 field 4-pole graphite conductivity cell (Hach Lange GmbH, Germany) was used to measure temperature (°C) and salinity (psu). The same device was used for pH measurements with an Intellical PHC101 field low maintenance gel filled pH electrode (Hach Lange GmbH, Germany). The pH electrode was calibrated before each fieldwork using single-use pH buffer solutions (pH 4.01, 7.00, 10.01, Hach Lange GmbH, Germany). Since October 2019, salinity and temperature were measured using a Multi 3510 IDS SET 4 handheld device equipped with a TetraCon® 925/LV 4-Pol-IDS conductivity electrode with graphite cells (WTW, Xylem Analytics Germany GmbH, Germany). Fluorescent dissolved organic matter (FDOM, ppb QSE) was measured using an AquaFluor Modell 80000-010 for UV-420 (Turner Designs Inc., USA), pre-calibrated in the laboratory. For this, water samples were taken from the field to a nearby mobile central field unit and were filtered within 1-2 hours after sampling using 25 mm Nuclepore syringe filters (0.2 µm pore size) directly into sample-pre-rinsed measurement cuvettes. Data quality control (QC) was performed using MATLAB (R2024b). Outlier detection was conducted both visually and statistically using z-score analysis (|z| > 3) per sampling campaign and plot. Each data point was assigned a Quality Control Flag (QC)
Growth, respiration rates and energetic reserves from a long-term (12-months) multiple driver aquarium experiment with the cold-water coral Desmophyllum pertusum
No full textWe conducted a long-term (12 months) multiple driver aquarium experiment under future environmental conditions at St Abbs Marine Station (UK) with the cold-water coral Lophelia pertusa (syn. Desmophyllum pertusum) sampled from Tisler Reef (Skagerrak). The experiment consisted of four different treatments to investigate the combined effect of ocean acidification, warming, deoxygenation and food limitation on their physiology: 1) control (9 °C, pH 8.1, 100 % oxygen, 100 % food availability), 2) multiple stressor with high feeding (HF; 12 °C, pH 7.7, 90 % oxygen, 100 % food availability), 3) multiple stressor with low feeding (LF; 12 °C, pH 7.7, 90 % oxygen, 50 % food availability) and 4) reduced oxygen (9 °C, pH 8.1, 90 % oxygen, 100 % food availability). Every treatment consisted of three replicate tanks with four live corals (12 in total). Water parameters (temperature, salinity, pH and oxygen concentration) were measured five times per week in every coral tank. The physiological parameters (survival, growth and respiration rate) were determined after 1.5, 3, 4.5, 6, 7.5, 9, 10.5 and 12 months of the experiment. Growth rates were measured using the buoyant weighing technique (Jokiel et al. 1978) with a high precision electronic balance (Pioneer Plus PA224C, OHAUS; precision: 0.1 mg) every 1.5 months. The skeletal dry mass of each coral was calculated from its wet mass and by taking into account the densities of seawater (1.023 ± 0.008 g cm-3) and L. pertusa skeletons (2.747 g cm-3; Naumann et al., 2014). Respiration rates were measured in closed-cell incubations vials in a water bath at the start of the experiment and every 1.5 months. In addition, the energetic reserves (protein, carbohydrate and lipid concentration) of six coral samples per treatment were analysed after 3, 6, 9 and 12 months. The protein, carbohydrate and lipid concentrations were then converted to kilojoules (kJ; protein: 23.9 kJ g-1, carbohydrate: 17.5 kJ g-1, lipid: 39.5 kJ g-1; Gnaiger & Bitterlich, 1984)
Porewater geochemistry of sediment core AL561_20-1
No full textThe AL561 cruise was conducted in the framework of the project APOC ("Anthropogenic impacts on Particulate Organic Carbon cycling in the North Sea"). This collaborative project between GEOMAR, AWI, HEREON, UHH, and BUND is to understand how particulate organic carbon (POC) cycling contributes to carbon sequestration in the North Sea and how this ecosystem service is compromised and interlinked with global change and a range of human pressures include fisheries (pelagic fisheries, bottom trawling), resource extraction (sand mining), sediment management (dredging and disposal of dredged sediments) and eutrophication. The main aim of the sampling activity during AL561 cruise was to recover undisturbed sediment from high accumulation sites in the Skagerrak/Kattegat and to subsample sediment/porewater at high resolution in order to investigate sedimentation transport processes, origin of sediment/POC and mineralization processes over the last 100- 200 years. Moreover, the actual processes of sedimentation and POC degradation in the water column and benthic layer will be addressed by sampling with CTD and Lander devices. In total 9 hydroacoustic surveys (59 profiles), 4 Gravity Corer, 7 Multicorer, 3 BIGO Lander and 3 CTD stations were successfully conducted during the AL561 cruise
Master tracks in different resolutions of MARIA S. MERIAN cruise MSM139, Reykjavik - Reykjavik, 2025-07-24 - 2025-08-26
No full textRaw data acquired by position sensors on board RV MERIAN during expedition MSM139 were processed to receive a validated master track which can be used as reference of further expedition data. During MSM139 the motion reference unit Kongsberg SeaTex AS MRU-5 combined with Kongsberg SeaTex AS Seapath 320 and the GPS receivers Trimble SPS855 and SAAB R4 were used as navigation sensors. Data were downloaded from DAVIS SHIP data base (http://dship.bsh.de) with a resolution of 1 sec. Processing and evaluation of the data is outlined in the data processing report. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track
Sediment elemental composition (XRF) of sediment core GeoB19904-2, measured with 30 kV
No full textXRF Core Scanner data of sediment core GeoB19904-2 from Labrador Sea were collected every centimetre downcore over an active area of 15 mm² with a downcore slit size of 10 mm using generator settings of 30 kV directly at the split core surface of the archive half with XRF Core Scanner II (AVAATECH Serial No. 2) at MARUM, Bremen
Sediment elemental composition (XRF) of sediment core GeoB19916-6, 10 kV run
No full textXRF Core Scanner data of sediment core GeoB19916-6 from Baffin Bay were collected every two centimetres downcore over an active area of 15 mm² with a downcore slit size of 10 mm using generator settings of 10 kV directly at the split core surface of the archive half with XRF Core Scanner II (AVAATECH Serial No. 2) at MARUM, Bremen
Elemental concentration of Late Cretaceous chalk samples from the Hallembaye quarry, Belgium
No full textSediment elemental composition (XRF) of sediment core GeoB19973-2, 10 kV run
No full textXRF Core Scanner data of sediment core GeoB19973-2 from Baffin Bay were collected every two centimetres downcore over an active area of 15 mm² with a downcore slit size of 10 mm using generator settings of 10 kV directly at the split core surface of the archive half with XRF Core Scanner II (AVAATECH Serial No. 2) at MARUM, Bremen
Near-surface soil temperatures at site MB_Site7Buried from the southern aspect of Mount Baker, USA
No full textWe present temperature measurements from the Mount Baker Climate Laboratory (MBCL; https://esr-mbcl.github.io/MBCL/). The MBCL is a citizen science effort that has operated continuously since July 2018 on the southern aspect of Mount Baker, Washington, USA. Here we share data from July 2018 - July 2024. The measurements were made in strategic arrays at nine sites ranging from elevations of 1000 m to the summit (3287 m). Data were collected using autonomous temperature sensors (iButtons) deployed in waterproof graphite housings. Data were collected at 4.25 hourly intervals. At each possible site, temperature measurements of shallow soil and near-surface air temperature (shaded and unshaded) were made in arrays after Lundquist and Lott (2008) and Lundquist and Huggett (2008). Above the treeline, only soil temperatures were made. Data from eight of nine sites have been successfully retrieved over this time period.
The sensor distribution across the southern aspect of Mount Baker was designed to coincide with a common, relatively safe ascent route to facilitate citizen science field logistics. The sensor array design and site distribution are intended to allow investigation into monitoring of hydrological and atmospheric phenomena like snow extent, snow depth (at one site), snow year length, critical temperature thresholds, mountain lapse rates, and model or reanalysis intercomparisons. More uses are possible.