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M76-2

This research campaign was carried out on vessel / platform: RV Meteor. Information on the campaign: http://seadata.bsh.de/Cgi-csr/retrieve_dod/viewReport.pl?csrref=20080112; Namibia. The campaign was carried out in the context of the following project(s): GENUS. The data of this campaign is partially published at https://doi.org/10.1594/PANGAEA.892369, https://doi.org/10.1594/PANGAEA.892246

ENWEPPA

This research campaign was carried out on vessel / platform: unknown. Information on the campaign: Heavy metals in the Weissen Elster catchment. The campaign was carried out in the context of the following project(s): ELBE-2000

Pore water and soil variables (pH, specific conductivity, nutrients, metals, sulfate and chloride concentrations, CNS) (Table 3)

Pore water parameters were measured in parallel to the gas measurements and soil coring for microbial analyses. Pore water/soil variables (pH, specific conductivity, nutrients, metals, sulfate and chloride concentrations, CNS) were either measured in-situ or taken to the laboratory as soil samples. Pore water/soil analysis was mostly conducted before rewetting and only repeated occasionally after rewetting where possible.

ENMULDE

This research campaign was carried out on vessel / platform: unknown. Information on the campaign: Mulde project. The campaign was carried out in the context of the following project(s): ELBE-2000

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.

Carbon system parameters in the Baltic Sea from 2003 to 2023 using IOW monitoring data

The saturation status of calcium carbonate forms was calculated as part of the CDRmare RETAKE project effort to assess potentials and impacts for using alkalinity enhancement to enhance the capture of atmospheric carbon dioxide (CO2). Therefore, this data set is a compilation of carbonate system parameters measured during the monitoring cruises of the Leibniz Institute for Baltic Sea Research Warnemünde (IOW) in the Baltic Sea from 2003 to 2023. Ancillary data was retrieved using the IOW's ODIN2 data tool accordingly. The following permanent link allows one to search and extract the data using our settings: https://odin2.io-warnemuende.de/957-0489-676. We paired the carbonate and ancillary (nutrient and hydrogen sulfide, H2S, data) data by selecting the respective cruise, station, timestamp, and depth. Next, we calculated the calcite and aragonite saturation state and other carbonate system parameters using the measured parameters always when two carbonate-system parameters were available. For these calculations, we used CO2SYS v.3.1.2 script for MATLAB (Sharp et al., 2023; van Heuven et al., 2011; Lewis and Wallace, 1998) with the following dissociation constants settings: K1 and K2 of Waters, Millero, & Woosley (2014), KSO4 of Dickson (1990), KF of Perez & Fraga (1987), and TB of Uppström (1979). Propagated uncertainty was calculated using the errors script for MATLAB CO2SYS of Orr et al. (2018) and applying the respective errors: total alkalinity (AT) = 4 µmol/kg, total inorganic dissolved carbon (CT) = 2 µmol/kg, pH = 0.005 (Total), phosphate (PO4) = 3.8%, silicate (SiO4) = 4.6%, and ammonium (NH4) = 9.2%. All carbonate system parameters are presented under 25°C and 0 atm conditions.

KOSMOS 2023 Helgoland mesocosm study on ocean alkalinity enhancement: phytoplankton and microzooplankton abundance and biomass data

This dataset contains species-resolved phytoplankton and microzooplankton abundance and biomass data from the KOSMOS 2023 Helgoland mesocosm experiment conducted in the coastal waters off Helgoland Island in the North Sea, Germany. The experiment investigated the effects of Ocean Alkalinity Enhancement (OAE) on plankton communities during the development of a natural spring bloom. Six mesocosms (~6 m³) were subjected to an immediate dilution OAE scenario, establishing an alkalinity enhancement gradient ranging from ΔTA 0 to 1250 µmol kg⁻¹ in increments of 250 µmol kg⁻¹ through calcium-based alkalinity addition. The dataset includes taxonomically resolved phytoplankton and microzooplankton abundance (cells mL⁻¹), carbon biomass (µg C L⁻¹), functional group classifications, and World Register of Marine Species (WoRMS) taxonomic identifiers. Associated carbonate chemistry measurements, including total alkalinity (TA), dissolved inorganic carbon (DIC), pH, fugacity of carbon dioxide (fCO₂), salinity, temperature, and calculated ΔTA values are provided for each sampling event.

DROPS_ELBE_UNDEFINED

This research campaign was carried out on vessel / platform: several, not specified. Information on the campaign: A collection of campaigns carried out for the DROPS_ELBE project without specific information provided.. The campaign was carried out in the context of the following project(s): DROPS_ELBE

Distribution of contaminants from the Elbe outflow into the North Sea (German Bight) based on water samples from the MOSES cruise Sternfahrt 10 in 2023

The Sternfahrt-10 of the MOSES campaign, from 29th August until the 15th of September 2023, had two objectives. One was to follow the dispersion of pollutants transported by the Elbe water into the North Sea, previously observed during the Elbe-Freshwater and Elbe-Tidal cruises. And second the distribution of the Elbe water within the German Bight. Therefore, drifter groups were deployed to follow individual water parcels. Those drifters were followed subsequently by three ships (RV Ludwig Prandtl, RV Littorina, RV Mya II), to extend the time period of measurements. Along the tracks, water samples were taken close to the drifters, alternatively at stations from previous cruises, resulting in 12 to 24 sampling points per week. In terms to detect the concentration of a variety of nutrients and carbon compounds from the south-eastern North Sea up to the island Amrum. Additionally, basic hydrographic parameters and greenhouse gases were sampled continuously throughout the whole cruise. Those results are not part of the present dataset, but can be found here, https://doi.org/10.1594/PANGAEA.971874. To ensure the comparability of the measured parameters a transportable container laboratory was passed from ship to ship always equipped with the same sensor systems. Just for specific water samples some special equipment was added. A map of the different tracks as well as information about the used sensors and data treatment, you can find in the additional material. For more detailed information about the MOSES Project and the cruise Sternfahrt-10, see the article cited in references.

GW2011-2016

This research campaign was carried out on vessel / platform: from land / without research vessel. Information on the campaign: The objectives of this project were to identify the key processes in the nitrogen cycle in the estuarine and coastal waters using stable N isotopes and to quantify these processes. As parameter the nutrient loads and stable isotopes values of nitrogen were measured.. The campaign was carried out in the context of the following project(s): Helmholtz-YIG. The data of this campaign is partially published at https://doi.org/10.1594/PANGAEA.865348

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