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Greenhouse gases in the River Elbe, 2020-2024

Measurements of dissovled greenhouse gases (GHG) being CO2, CH4 and N2O were performed from 2020 until 2024. Water samples were taken from bridges at tow locations at the river Elbe; Magdeburg and Wittenberge. For CO2, CH4, and N2O analysis, 30 mL water samples were collected in 60 mL plastic syringes. A headspace of 30 mL ambient air was added. After vigorously shaking for one minute the headspace was transferred to pre-evacuated 12 mL exetainers (Labco, UK) and water temperature in the syringe (=equilibration temperature) was measured. Ambient air samples for headspace correction were taken on each occasion. These samples were analysed in the laboratory with gaschromatography (Koschorreck et al 2021). Water physicochemical parameter (temperature, O2, pH) were measured immediately with a WTW-probe. Water-chemical variables were measured using standard methods as described in Kamjunke et al. (2021).

TemBi 2014 mesocosm study: Summer storm impact on water chemistry and physics in Lake Stechlin

We simulated an experimental summer storm in large-volume (~1200 m³, ~16m depth) enclosures in Lake Stechlin by mixing deeper water masses from the meta- and hypolimnion into the mixed layer (epilimnion). The mixing included the disturbance of a deep chlorophyll maximum (DCM) which was present at the same time of the experiment in Lake Stechlin and situated in the metalimnion of each enclosure during filling. Water physical variables and water chemistry was monitored for 42 days after the experimental disturbance event. Mixing disrupted the thermal stratification, increasing concentrations of dissolved nutrients and CO2 and changing light conditions in the epilimnion. Mixing, thus, stimulated phytoplankton growth, resulting in higher particulate matter concentrations of carbon, nitrogen and phosphorous.

Hangneigung (Schwellwert 20 Prozent), Rasterauflösung 5 m

Die Hangneigung entspricht dem sogenannten Hangneigungswinkel und ist die Neigung der Geländeoberfläche gegenüber der Horizontalen entlang einer Falllinie (maximaler Neigungswinkel des Geländes). Die Karte stellt alle Flächen mit einer Hangneigung größer 20 Prozent in einer Rasterauflösung von 5 m dar. Sind mehr als 30% der Fläche eines Grünlandschlages oder eines Ackerschlages mit mehrschnittigem Feldfutterbau in Bereichen mit einer Hangneigung größer 20 Prozent, ist der Schlag von den Vorgaben des § 6 Abs. 3 Satz 2 DüV, wonach flüssige organische und flüssige organisch-mineralische Düngemittel, einschließlich flüssiger Wirtschaftsdünger, mit wesentlichem Gehalt an verfügbarem Stickstoff oder Ammoniumstickstoff auf Grünland und auf Ackerflächen mit mehrschnittigem Feldfutterbau ab dem 01. Februar 2025 nur noch streifenförmig auf den Boden aufgebracht oder direkt in den Boden eingebracht werden dürfen, befreit. Die Hangneigung entspricht dem sogenannten Hangneigungswinkel und ist die Neigung der Geländeoberfläche gegenüber der Horizontalen entlang einer Falllinie (maximaler Neigungswinkel des Geländes). Die Karte stellt die Hangneigung in den zwei Klassen "kleiner gleich 20 Prozent" und "größer 20 Prozent" mit einer Rasterauflösung von 5 m dar. Sind mehr als 30% der Fläche eines Grünlandschlages oder eines Ackerschlages mit mehrschnittigem Feldfutterbau in der Klasse "größer 20 Prozent", ist der Schlag von den Vorgaben des § 6 Abs. 3 Satz 2 DüV, wonach flüssige organische und flüssige organisch-mineralische Düngemittel, einschließlich flüssiger Wirtschaftsdünger, mit wesentlichem Gehalt an verfügbarem Stickstoff oder Ammoniumstickstoff auf Grünland und auf Ackerflächen mit mehrschnittigem Feldfutterbau ab dem 01. Februar 2025 nur noch streifenförmig auf den Boden aufgebracht oder direkt in den Boden eingebracht werden dürfen, befreit.

Soil porewater chemistry survey of European peatlands

Porewater and soil samples were collected from 64 natural and rewetted peatlands across Germany (47 sites), Poland (5), Estonia (6), Scotland (3), Sweden (2), and Georgia (1) between 1997 and 2017. A total of 812 anoxic porewater samples were taken from water-saturated soil layers (0–0.6 m depth) using dialysis samplers along 10–20 m transects (Hesslein, 1976). Selected fen sites were monitored for 10–20 years post-rewetting to assess seasonal and long-term nutrient dynamics. The peatlands varied in drainage history and land use intensity, resulting in different degrees of decomposition in the upper peat layers (0–0.4 m depth). The dialysis sampling technique enabled unbiased sampling of oxygen-sensitive dissolved solutes and provided vertical concentration profiles of porewater chemistry (Zak et al., 2004). The data were used to compare porewater composition between rewetted and natural peatlands (bogs and fens), (ii) evaluate the influence of peat characteristics on porewater chemistry in rewetted sites, (iii) examine seasonal variations in nutrient concentrations in rewetted fens, and (iv) assess long-term changes in porewater composition following rewetting.

Water chemistry of Lagrangian samplings of Inland Elbe 2024 (MOSES Hydrological Extremes)

Within the framework of MOSES (Modular Observation Solutions for Earth Systems) and ElbeXtreme, we performed three longitudinal sampling campaigns in the Elbe catchment in 2024. The campaigns covered the German freshwater part, the tidal Elbe river, and the German Bight. Here we present the results of the freshwater river where the sampling was conducted in a Langrangian way according to flow velocity. Physico-chemical and biological parameters were measured along the Elbe from bridges between Bad Schandau (km 12, Czech-German border) and Lauenburg (km 570, close to Hamburg). A particular scientific focus was on (1) nutrients and eutrophication, (2) composition of dissolved organic matter measured by high-resolution mass spectrometry, (3) greenhouse gas measurements, and (4) micropollutants. This was done during a winter flood event in January, a summer drought in July, and a second smaller flood in September 2024.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2022

In 2022, 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 immediately 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.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2021

In 2021, 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 immediately 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.

Hydrochemistry at time series station Helgoland Roads, North Sea, in 2024

In 2024, 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 immediately 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.

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 immediately 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.

WMS - Hangneigung (Schwellwert 20 Prozent), Rasterauflösung 5 m

Die Hangneigung entspricht dem sogenannten Hangneigungswinkel und ist die Neigung der Geländeoberfläche gegenüber der Horizontalen entlang einer Falllinie (maximaler Neigungswinkel des Geländes). Die Karte stellt die Hangneigung in den zwei Klassen "kleiner gleich 20 Prozent" und "größer 20 Prozent" mit einer Rasterauflösung von 5 m dar. Sind mehr als 30% der Fläche eines Grünlandschlages oder eines Ackerschlages mit mehrschnittigem Feldfutterbau in der Klasse "größer 20 Prozent", ist der Schlag von den Vorgaben des § 6 Abs. 3 Satz 2 DüV, wonach flüssige organische und flüssige organisch-mineralische Düngemittel, einschließlich flüssiger Wirtschaftsdünger, mit wesentlichem Gehalt an verfügbarem Stickstoff oder Ammoniumstickstoff auf Grünland und auf Ackerflächen mit mehrschnittigem Feldfutterbau ab dem 01. Februar 2025 nur noch streifenförmig auf den Boden aufgebracht oder direkt in den Boden eingebracht werden dürfen, befreit.

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