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Physical oceanography during ALKOR cruise AL601

Conductivity-temperature-depth profiles were measured using a ADM-CTD SN MOCNET during RV ALKOR cruise AL601. The CTD was equipped with duplicate sensors for temperature, conductivity and oxygen. The oxygen sensor (galvanic oxygen micro-sensor (AMT)) was exchanged in the beginning of the year. The sensors are used throughout the year and no post-cruise calibration is applied. All other sensors of the CTD are calibrated irregularly. This dataset presents conductivity–temperature–depth (CTD) profiles collected during the research cruise. The data were processed using a custom Python workflow designed to summarize, standardize, and prepare CTD measurements for publication. Raw sensor output files (.TOB format) were parsed using a dedicated reader that extracts header metadata and harmonizes variable naming conventions across all profiles. Quality control procedures included the removal of non-physical values, treatment of missing or malformed entries, and consistency checks across key variables such as pressure, temperature, conductivity, and derived parameters (e.g., salinity and oxygen). Oxygen values were scaled, and salinity values were corrected according to the respective CTD calibration. Sensor channels were standardized and renamed to ensure compatibility with common data standards. Geographic coordinates were converted from degrees and minutes to decimal degrees to improve geospatial usability. Pressure was linearly interpolated to a uniform 1 dbar grid, and all depth-dependent parameters were interpolated accordingly. Maximum recorded pressure was cross-checked against local bathymetry (elevation); in cases of mismatch, profiles were truncated at the maximum depth of the corresponding location. The workflow further includes visual quality control of oxygen saturation, station locations, and vertical profiles of temperature, salinity, and oxygen.

Nutrient concentrations from two benthic chambers and the ambient bottom water during an in-situ incubation experiment in July 2025

The dataset contains dissolved nutrient concentrations from water samples collected during a 16-day in-situ incubation experiment in the Baltic Sea (2025-07-12 to 2025-07-29). Samples were collected using an automated glass-syringe sampler deployed within two benthic chambers of a Biogeochemical Observatory (BIGO, Sommer et al., 2009) at 54° 34.432' N, 10° 10.776' E, at 22 m water depth. In one chamber, 29 g of fine calcite powder were added to the bottom water as part of an enhanced benthic calcite weathering experiment. Seven samples per chamber and from the ambient bottom water were analyzed to assess potential nutrient fluxes associated with the calcite addition and benthic biogeochemical processes.

BMP: Monitoring Cruise 2026/03 EMB392 (TF0115, 54.7949 N, 13.0582 E) (IOWDB)

Marine chemical, physical and biological investigations at TF0115, 54.7949 N, 13.0582 E (2026-03-27) during the Monitoring Cruise 2026/03 EMB392 of IOW as part of the monitoring program of the Baltic marine environment in the framework of the Helsinki agreement (HELCOM COMBINE) and IOWs long term data series in the central Baltic Sea.

Chlorophyll a and turbidity measurements at lander_2 in a coastal peatland at the German Baltic Sea in 2021

Rewetting peatlands is an important measure to reduce greenhouse gas (GHG) emissions. However, after rewetting, the areas are highly heterogeneous in terms of GHG exchange, which depends on water level and source, vegetation, previous use, and duration of rewetting. These challenging conditions require new technologies that go beyond discrete sampling. Here we present data from two autonomous lander platforms deployed at the sediment-water interface (bottom lander) of a shallow coastal peatland (approx. 1 m water depth) that was rewetted by brackish water from the Baltic Sea, thus becoming part of the coastal water through a permanent connection. These landers were equipped with six commercially available state-of-the-art sensors, and temporal high-resolution measurements of physico-chemical variables, including partial pressures of carbon dioxide (CO2) and methane (CH4), were made. The resolution of the field data ranged from 10 seconds to 120 minutes and was obtained for partial pressure of CO2 (Contros HydroC-CO2) and CH4 (Contros HydroC-CH4), temperature, salinity, pressure (water depth), oxygen (O2) (CTD-O2 with SBE-37SMP-ODO), the concentrations of phosphate (SBE HydroCycle PO4), nitrate (SBE SUNA V2), chlorophyll a and the turbidity (both with SBE-FLNTUSB ECO) as stationary measurements at two different locations in close proximity. The CTD and oxygen measurements provide exact water depth data for the respective lander locations. In the other data sets (e.g., CO2 measurements) rounded data are inserted instead of the exact depth data, which is 0.6 m for lander_1 and 0.9 m for lander_2. SUNA raw data are provided for completeness. However, we found them of insufficient quality to estimate nitrate concentrations due to interferences and biofouling. The deployment and recovery of the landers, and thus the measurements, took place between 02 June 2021 and 09 August 2021, and the sensors were operated under permanent wired power supply and a centralized timestamp. The sensors were maintained and cleaned bi-weekly. Results show considerable temporal fluctuations expressed as multi-day, diurnal, and event-based variability, with spatial differences caused by biologically-dominated variables.

BMP: Monitoring Cruise 2026/02 EMB387 (TF0115, 54.7951 N, 13.0572 E) (IOWDB)

Marine chemical, physical and biological investigations at TF0115, 54.7951 N, 13.0572 E (2026-02-07) during the Monitoring Cruise 2026/02 EMB387 of IOW as part of the monitoring program of the Baltic marine environment in the framework of the Helsinki agreement (HELCOM COMBINE) and IOWs long term data series in the central Baltic Sea.

BMP: Monitoring Cruise 2026/03 EMB392 (TF0286, 58.0000 N, 19.9004 E) (IOWDB)

Marine chemical, physical and biological investigations at TF0286, 58.0000 N, 19.9004 E (2026-04-02) during the Monitoring Cruise 2026/03 EMB392 of IOW as part of the monitoring program of the Baltic marine environment in the framework of the Helsinki agreement (HELCOM COMBINE) and IOWs long term data series in the central Baltic Sea.

WMS MSRL: D8-Schadstoffe (sh-llur), Mittelwert 2005-2010

Der WMS umfasst Schadstoffe im Wasser und im Sediment, die an Messstationen des LLUR erfasst werden. Parameter: Quecksilber, Blei, Kupfer, Nickel, Arsen, Cadmium, Chrom, Zink.

BMP: Monitoring Cruise 2026/02 EMB387 (TF0115, 54.7952 N, 13.0581 E) (IOWDB)

Marine chemical, physical and biological investigations at TF0115, 54.7952 N, 13.0581 E (2026-02-17) during the Monitoring Cruise 2026/02 EMB387 of IOW as part of the monitoring program of the Baltic marine environment in the framework of the Helsinki agreement (HELCOM COMBINE) and IOWs long term data series in the central Baltic Sea.

BMP: Monitoring Cruise 2025/11 EMB379 (TF0115, 54.7947 N, 13.0581 E) (IOWDB)

Marine chemical, physical and biological investigations at TF0115, 54.7947 N, 13.0581 E (2025-10-30) during the Monitoring Cruise 2025/11 EMB379 of IOW as part of the monitoring program of the Baltic marine environment in the framework of the Helsinki agreement (HELCOM COMBINE) and IOWs long term data series in the central Baltic Sea.

Wasserstand Pegel Lippe - Ostsee

Der Pegel Lippe befindet sich im Gewässer Ostsee. Alle Daten sind Rohdaten ohne Gewähr. Das Land Schleswig-Holstein übernimmt keine Gewähr für die Aktualität, Korrektheit, Vollständigkeit oder Qualität der dargestellten Informationen. Haftungsansprüche sind grundsätzlich ausgeschlossen. [Informationen zum Pegel](https://hsi-sh.de/pegel/pegel.html?mstnr=114609) Der Datensatz enthält folgende Felder * **Zeit** im Format `yyyy-MM-dd HH:mm:ss` * **Wasserstand** in cm * **Status** Angabe "1" bedeutet qualitätsgesichert, "0" bedeutet nicht qualitätsgesichert * **Wertetyp** Angabe "mw" bedeutet Mittelwert, "thw" bedeutet Tidehochwasser, "tlw" bedeutet Tideniedrigwasser Zeichensatz ist ISO-8859-1, Spaltentrenner ist Semikolon.

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