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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.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2013

In 2013, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity, dissolved inorganic nutrients, pH and oxygen were measured from a bucket sample in the laboratory.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2010

In 2010, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity and dissolved inorganic nutrients were measured from a bucket sample in the laboratory.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2008

In 2008, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity and dissolved inorganic nutrients were measured from a bucket sample in the laboratory.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2023

In 2023, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity, dissolved inorganic nutrients, pH and oxygen were measured from a bucket sample in the laboratory. Further information regarding the methodology and the devices used can be found in the metadata description.

Herstellung wasserlöslicher NPK-Dünger sowie NK, PK auf Basis von Biogas Gärrest und Gülle, Teilvorhaben 1: Extraktion von Stickstoff- und Phosphorverbindungen aus Biogas-Gärresten und biologische Nitrifizierung von Ammoniumstickstoff

Grundwassermessstelle GARDING F1 1285.0

Dieser Datensatz beschreibt die Grundwassermessstelle GARDING F1 1285.0 in Schleswig-Holstein. Die Messstelle liegt im Grundwasserkörper EI15 : Eider/Treene - Marschen und Niederungen. Es liegen insgesamt 55169 Messwerte vor. Es liegen außerdem 17 Probenentnahmen vor (siehe Resourcen).

Water column, solid phase and porewater data in the Kiel Bight, SW Baltic Sea from 2016 to 2025

During the research cruises BE03/2016 (08.03.2016), BE10/2016 (19.10.2016), BE10/2018 (23.10.2018), BE03/2019 (15.03.2019), L23-13 (13.09.2023 - 15.09.2023), Sagitta24-1 (16.09.2024), Sagitta24-2 (23.09.2024), Hai24VE2 (24.09.2024), L25-2b (09.02.2025 - 17.02.2025) and EMB374 (04.09.2025 - 13.09.2025), CTDs were deployed and sediment corers were retrieved at 131 stations in Kiel Bight in the southwestern Baltic Sea. Water column oxygen concentrations, temperature and salinity were determined using oxygen and CTD sensors. At selected water depths, water samples were collected with Niskin bottles for the analysis of nitrate concentrations using an autoanalyzer. Short sediment cores (<50cm) were recovered using a Multicorer (MUC), Minicorer (MIC) or Rumohrlot (RL). Bottom waters were sampled from the supernatant water in the sediment cores. Solid phase sediment samples were analyzed for total organic carbon using an element analyzer. Porewater was extracted from the sediment cores uzing rhizones and analyzed for total alkalinity (titration), ammonium (photometer), sulfate (ion chromatography), hydrogen sulfide (photometer), dissolved iron (ICP-OES) and dissolved manganese (ICP-OES). The collected data will be used to (i) determine the spatial and temporal variability of hydrogen sulfide in bottom waters of the Kiel Bight, (ii) identify the controlling factors governing the accumulation of hydrogen sulfide at the seafloor, and (iii) establish an early warning system of sulfidic conditions for regional stakeholders in the Baltic Sea.

Aufklärung der mikrobiellen Nitratumsetzung in einem Süßwasserhabitat bei Anwesenheit von Methan, Nitrat und Ammonium: Koppelung von n-damo (Nitrat/Nitrit-abhängige anaerobe Methanoxidation) und Anammox (anaerobe Oxidation von Ammonium)

In diesem Projekt wollen wir in einem Süßwasserhabitat die Koppelung der nitratabhängigen Methanoxidation (n-damo) mit dem Anammox Prozess nachweisen. Messungen der stabilen Isotope im Methan, Nitrat, Nitrit, Ammonium und DIC und molekularbiologische Methoden sollen helfen, diese Prozesse zu entschlüsseln. Zudem wollen wir klären, wie die Erkenntnis von einströmendem Grundwasser in das Habitat (Interaktion zwischen Grundwasser und Seewasser) zu erklären ist, dass die für die Prozesse (n-damo, Anammox, Methanogenese) benötigten stabilen Umwelt- bzw. anoxischen Redoxbedingungen vorliegen.

Ueber die Herkunft von Ammonium im Wasser

In einigen Veroeffentlichungen der letzten Jahre wird die Bildung von Ammonium aus Nitrat in Frage gestellt. Wir haben aus je einer Erd- und Talsperrensedimentprobe 60 verschiedene Staemme von nitratammonifizierenden Bakterien erhalten. Von den Bakterien, die unter anaeroben Bedingungen aus Nitrat Ammonium bilden, sind diejenigen zu trennen, die Nitrat unter Bildung von N2 oder N2O denitrifizieren. Verschieden von beiden Prozessen ist die Ammoniumbildung aus organischen, stickstoffhaltigen Verbindungen (Ammonifikation). Nitratammonifizierende Bakterien koennen auch Nitrit und teilweise Hydroxylamin unter anaeroben Bedingungen reduzieren. Sowohl bei der Denitrifikation als auch bei der Nitratammonifikation kann aus organischer Substanz Ammonium gebildet werden.

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