API src

Found 210 results.

Distribution and concentration of nutrients, carbon compounds and methane in water samples in the southern German Bight (North Sea) in September 2024 during the MOSES Sternfahrt 12

The 12th Sternfahrt of the ElbeXtreme and MOSES projects took place in 2024 from September 02 to 13, within the area of the German Bight (North Sea). Its objective was to get a more systematic grid of sampling data by spatially integrated onboard sensors. Therefore, the MOSES-laboratory container was installed again. Water samples were taken from the surface with a rosette or via Niskin bottles. The first part of the cruise was conducted by the research vessel (RV) Ludwig Prandtl, starting on the 2nd of September on Heligoland. From there, the crew navigated towards Cuxhaven covering some stations from previous MOSES cruises. For the next days, the ship followed a rectangular track, shifting northward each day, heading towards Heligoland again. Due to strong winds, the sampling stations were reduced to three on the last day. On Heligoland the RV Mya II took over the laboratory container and other sampling equipment for the second part of the cruise. Persistent strong winds delayed the start of the cruise until September 11. Since most of the planned stations were already covered from the RV Ludwig Prandtl, the crew decided to expand the sampling area using a more systematic zig-zag line. With the return of Mya II in the afternoon of the 13th September 2024, the campaign was successfully finished.

Hydrographic parameters, dissolved CH4, atmospheric CH4 and CO2 along the river Elbe, August 2020

In August 2020 the research vessel Albis investigated the river Elbe from Schmielka towards Geesthacht. Basic hydrographic parameters were measured continuously, with a portable ferryBox. Dissolved methane was continuously determined with a degassing unit and a Greenhouse Gas Analyzer from LosGatosResearch. Atmospheric CH4 and CO2 was determined with a Licor system.

Collection of data sets for the MOSAiC Airborne observations in the Central Arctic (MOSAiC-ACA) campaign, carried out in late summer 2020 northwest of Svalbard

This data set unites the individual data of the MOSAiC Airborne observations in the Central Arctic (MOSAiC-ACA) campaign, carried out in late summer 2020 northwest of Svalbard (Norway). The objective of MOSAiC-ACA was to study turbulent fluxes of energy and momentum in the Arctic boundary layer and low- and mid-level mixed-phase clouds and their role in Arctic amplification in the exit area of the research vessel Polarstern during the MOSAiC expedition. The research aircraft Polar 5 was equipped with active and passive remote sensing instruments, measurements for turbulent and radiative energy fluxes, insitu probes for cloud and aerosol particles, and dropsondes. In total, 10 research flights with 44 flight hours over the open ocean and the marginal sea ice zone have been performed between 30 August and 13 September 2020.

Atmospheric measurements gathered during Polarstern cruise PS147

The ship campaign PS147 (Atlantic Transit) with the German research vessel Polarstern took place from 12 March to 14 April 2025. The transit proceeded from Stanley, Falkland Islands, to Bremerhaven, Germany, with a stopover in Mindelo, Cape Verde, dividing the campaign into two sections, PS147/1 and PS147/2. During the voyage, several climate zones were crossed, including the Intertropical Convergence Zone (ITCZ). Here, we present a series of standardised data sets of the atmospheric observations gathered during the PS147 campaign.

Microbial community composition and bacterioplankton at time series station Helgoland Roads, North Sea

A process of global importance in carbon cycling is the remineralization of algae biomass by heterotrophic bacteria, most notably during massive marine algae blooms. Such blooms can trigger secondary blooms of planktonic bacteria that consist of swift successions of distinct bacterial clades, most prominently members of the Flavobacteriia, Gammaproteobacteria and the alphaproteobacterial Roseobacter clade. This study explores such successions during spring phytoplankton blooms in the southern North Sea (German Bight) for four consecutive years. The surface water samples were taken at Helgoland Island about 40 km offshore in the southeastern North Sea in the German Bight at the station 'Kabeltonne' (54° 11.3' N, 7° 54.0' E) between the main island and the minor island, Düne (German for 'dune') using small research vessels (http://www.awi.de/en/expedition/ships/more-ships.html). Water depths at this site fluctuate from 6 to 10 m over the tidal cycle. Samples were processed as described previously (Teeling et al., 2012; doi:10.7554/eLife.11888.001) in the laboratory of the Biological Station Helgoland within less than two hours after sampling. Assessment of absolute cell numbers and bacterioplankton community composition was carried out as described previously (Thiele et al., 2011; doi:10.1016/B978-0-444-53199-5.00056-7). To obtain total cell numbers, DNA of formaldehyde fixed cells filtered on 0.2 mm pore sized filters was stained with 4',6-diamidino-2-phenylindole (DAPI). Fluorescently labeled cells were subsequently counted on filter sections using an epifluores-cence microscope. Likewise, bacterioplankton community composition was assessed by catalyzedreporter deposition fluorescence in situ hybridization (CARD-FISH) of formaldehyde fixed cells on 0.2 mm pore sized filters.

High-resolution measurements of essential climate variables in the North Sea from the autonomous surface vehicle HALOBATES during RV Heincke cruise HE644

The file contains data from the autonomous surface vehicle HALOBATES. It gathered Essential Climate Variables (ECVs) like sea surface temperature (SST) and salinity (SSS). Data were collected during RV Heincke cruise HE644 from 10 to 31 July 2024 in the German Bight, North Sea. HALOBATES measured conductivity, temperature and pH at seven depths. Vertical resolution was ~10 centimetres. Depths spanned the near-surface layer (NSL, at 30, 40, 50, 60, 85, and 100 cm) to the sea-surface microlayer (SML, ~ 80 µm). NSL water was collected with tubes on a bow-mounted ladder. SML water was collected using six partially submerged glass disks. Water from all sampled depths, including the SML, reached the CTD sensors via a pumped flow-through system. Additional temperature sensors were mounted beneath the catamaran corresponding to depths of the flow-through system inlets. Salinity was corrected with discrete water samples. Additionally, offsets between the CTDs were corrected. Two data loggers with meteorological stations recorded wind speed, air temperature, relative humidity, solar radiation, GPS positions, and others. Upward and downward facing pyranometers and pyrgeometers mounted on the research vessel measured net radiative fluxes for short- and longwave radiation. A disdrometer also mounted on the vessel measured precipitation. The research vessel kept an average distance of 500 metres from HALOBATES which was operated manually or via autopilot. Autopilot involved pre-defined waypoints whilst manual involved steering HALOBATES with a remote control or drifting with surface currents during station work. The dataset includes quality flags 0-4 with flags 1 and 2 are ready for use. See metadata for more information.

Shipboard Automated Meteorological and Oceanographic System (SAMOS) air-sea fluxes, version 3, 2005-2024

Along ship track bulk turbulent heat and momentum fluxes derived using one-minute interval data collected by the Shipboard Automated Meteorological and Oceanographic System (SAMOS) initiative. The fluxes are provided as three products derived using three widely accepted air-sea flux algorithms (Smith 1988, COARE 3.6, and a 2023 update of Bourassa 2006). Datasets are organized by ship and flux algorithm. The dataset uses SAMOS data from 47 research vessels with observations spanning 2005-2024. Data include heat and momentum fluxes, state variables adjusted to 10 meters, and multiple inputs and outputs from the flux algorithms. These data have wide use for satellite product and model evaluation; air-sea interaction, marine biology, chemistry and geoscience research activities; climate science, and marine geoinformatics. Data coverage is the global oceans, but is concentrated around North America. Fluxes are derived from along cruise track navigational, meteorological, and oceanographic observations from 47 research vessels. Fluxes are derived at one-minute intervals (the same as the source observations) and take advantage of extensive quality control flags on the source SAMOS data. Additional QC flags are applied to the derived fluxes, height adjusted state variables, and other outputs of the flux algorithms. All data are provided in CF and ACDD compliant netCDF files, with extensive metadata. The uncompressed data volume is ca. 180 GB per algorithm.

Chemical analysis of explosive compounds in common dab collected during RV Heincke expedition HE635 from munition dumping areas west of Sylt (NNW03L) and south-west of Heligoland (North Sea)

This dataset documents field investigations regarding the release of legacy World War I and II munition explosive compounds into marine biota, focusing on munition dumping areas west of the island of Sylt and south west of the island of Heligoland, North Sea. Flatfish Limanda limanda (common dab) was chosen as a sentinel species. Sampling was conducted during the HE635 cruise in March 2024 with the research vessel Heincke of the Alfred Wegener Institute (AWI). Fish were caught using bottom trawls deployed close to the borders of the dumping areas marked on the sea charts. Before dissection, captured fish were transferred to seawater tanks, and only live fish were taken for analysis. Each individual was measured, weighed, and after killing the fish livers were assessed macroscopically. In addition, biometric factors were measured to determine condition factors as indicators of general health. Tissue samples of gills, liver, and muscle, as well as blood, bile, and urine, were taken, immediately frozen in liquid nitrogen, and stored at -20°C before chemical analysis. Sample processing in the laboratory followed established protocols (Bünning et al. 2021). In brief, all samples were homogenized and then extracted using solid phase extraction (SPE). Bile, urine, and blood samples were treated with β-glucuronidase (Helix pomatia), followed by a liquid-liquid extraction step for blood and bile samples before SPE. All samples were analyzed by gas chromatography coupled with triple quadrupole mass spectrometry (GC-MS/MS) for the explosive compound 2,4,6-trinitrotoluene (TNT), its metabolites 2-amino-4,6-dinitrotoluene (2-ADNT) and 4-amino-2,6-dinitrotoluene (4-ADNT), and the explosive by-products 2,4-dinitrotoluene (2,4-DNT) and 1,3-dinitrobenzene (1,3-DNB). Additionally, liquid chromatography coupled with triple quadrupole mass spectrometry (LC-MS/MS) was used to quantify the nitramine explosives hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The dataset includes measured compound concentrations and associated sample metadata.

Chemical analysis of explosive compounds in common dab (Limanda limanda) collected during the RV Heincke expedition HE622 from World War I + II munition dumping areas west of Sylt (NNW03L) and north of Spiekeroog (NSW03L)

This dataset documents field investigations regarding the release of legacy World War I and II munition explosive compounds into marine biota, focusing on munition dumping areas west of the island of Sylt, north of the island of Spiekeroog, and south of the reference area Borkum Riffgrund, North Sea. Flatfish Limanda limanda (common dab) was chosen as a sentinel species. Sampling was conducted during the HE622 cruise in June 2023 with the research vessel Heincke of the Alfred Wegener Institute (AWI). Fish were caught using bottom trawls deployed close to the borders of the dumping areas marked on the sea charts. Before dissection, captured fish were transferred to seawater tanks, and only live fish were taken for analysis. Each individual was measured, weighed, and after killing of the fish livers were assessed macroscopically. In addition, biometric factors were measured to determine condition factors as indicators of general health. Tissue samples of gills, liver, and muscle, as well as blood, bile, and urine, were taken, immediately frozen in liquid nitrogen, and stored at -20°C before chemical analysis. Sample processing in the laboratory followed established protocols. In brief, all samples were homogenized and then extracted using solid phase extraction (SPE). Bile, urine, and blood samples were treated with β-glucuronidase (Helix pomatia), followed by a liquid-liquid extraction step for blood and bile samples before SPE. All samples were analyzed by gas chromatography coupled with triple quadrupole mass spectrometry (GC-MS/MS) for the explosive compound 2,4,6-trinitrotoluene (TNT), its metabolites 2-amino-4,6-dinitrotoluene (2-ADNT) and 4-amino-2,6-dinitrotoluene (4-ADNT), and the explosive by-products 2,4-dinitrotoluene (2,4-DNT) and 1,3-dinitrobenzene (1,3-DNB). Additionally, liquid chromatography coupled with triple quadrupole mass spectrometry (LC-MS/MS) was used to quantify the nitramine explosives hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The dataset includes measured compound concentrations and associated sample metadata.

Shipboard Automated Meteorological and Oceanographic System (SAMOS) air-sea fluxes, version 2, 2005-2015

Along ship track bulk turbulent heat and momentum fluxes derived using one-minute interval data collected by the Shipboard Automated Meteorological and Oceanographic System (SAMOS) initiative. The fluxes are provided as three products derived using three widely accepted air-sea flux algorithms (Smith 1988, COARE 3.5, and a 2013 update of Bourassa 2006). Datasets are organized by ship and flux algorithm. The dataset uses SAMOS data from 19 research vessels with observations spanning 2005-2015. Data include heat and momentum fluxes, state variables adjusted to 10 meters, and multiple inputs and outputs from the flux algorithms. These data have wide use for satellite product and model evaluation; air-sea interaction, marine biology, chemistry and geoscience research activities; climate science, and marine geoinformatics. The data are concentrated in the oceans around North America, but select data are available from most ocean basins. Fluxes are derived from along cruise track navigational, meteorological, and oceanographic observations from 19 research vessels. Fluxes are derived at one-minute intervals (the same as the source observations) and take advantage of extensive quality control flags on the source SAMOS data. Additional QC flags are applied to the derived fluxes, height adjusted state variables, and other outputs of the flux algorithms. All data are provided in CF and ACDD compliant netCDF files, with extensive metadata. The uncompressed data volume is ca. 5 GB.

1 2 3 4 5 … 19 20 21