Dähnke, Kirstin; Jacob, Juliane; Schulz, Gesa; Ankele, Markus; Metzke, Marc; Schmidt, Leon; Sanders, Tina (2023): A decade of nitrate dual stable isotope measurements in the Elbe River (Germany) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.960361
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
We investigated nutrient input and retention in the Elbe River (Germany) at the river/estuarine transition with high agricultural loads of nitrogen. Surface water samples were taken at the weir Geesthacht (stream kilometre 585, 53°25'31''N, 10°20'10''E) from 2011 to 2021. In these samples, we analyzed nutrient concentrations, nitrate dual stable isotopes and suspended particulate matter composition. Usually, samples were taken once or twice per month. Aims of the study were to investigate 1) nitrate retention in the Elbe River and catchment, 2) seasonal dynamic of nitrate stable isotopes and 3) key nitrogen turnover processes and their respective controls over a ten year period.
Related to:
Jacob, Juliane; Sanders, Tina; Dähnke, Kirstin (2016): Nitrite consumption and associated isotope changes during a river flood event in the Elbe river. Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, PANGAEA, https://doi.org/10.1594/PANGAEA.865348
Project(s):
Helmholtz-Zentrum Hereon (Hereon)
Coverage:
Latitude: 53.425270 * Longitude: 10.336110
Date/Time Start: 2011-07-06T06:00:00 * Date/Time End: 2021-06-14T06:00:00
Minimum DEPTH, water: 0 m * Maximum DEPTH, water: 0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample ID | Sample ID | Dähnke, Kirstin | |||
| 2 | DEPTH, water | Depth water | m | Dähnke, Kirstin | Geocode | |
| 3 | DATE/TIME | Date/Time | Dähnke, Kirstin | Geocode – UTC | ||
| 4 | δ15N, nitrate | δ15N NO3 | ‰ air | Dähnke, Kirstin | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column |
| 5 | δ18O, nitrate | δ18O NO3 | ‰ | Dähnke, Kirstin | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column |
| 6 | Nitrogen in ammonium | N-[NH4]+ | µmol/l | Dähnke, Kirstin | Fluorescence measurement (OPA), with auto-analyser | measured in water column |
| 7 | Nitrogen in nitrite | N-[NO2]- | µmol/l | Dähnke, Kirstin | Continuous flow analyser (AA3, Seal Analytics, Germany) | measured in water column; Nutrient concentrations were analysed with a continuous flow analyser (AA3, Seal Analytics, Germany). For nitrite and nitrate analyses, standard photometric techniques were used (Grasshoff et al., 2009) with detection limits of 0.1 and 1.0 micromol per liter. Ammonium was measured fluorometrically with a detection limit of 0.5 micromol per liter based on (Holmes et al., 1999). Detection limits: nitrite (NO2) 0.1 micromol per liter, nitrate (NO3) 1.0 micromol per liter, amonnium (NH4) 0.5 micromol per liter. Average of the measurement of 2 replicates. |
| 8 | Nitrogen in nitrate | N-[NO3]- | µmol/l | Dähnke, Kirstin | measured in water column; Nutrient concentrations were analysed with a continuous flow analyser (AA3, Seal Analytics, Germany). For nitrite and nitrate analyses, standard photometric techniques were used (Grasshoff et al., 2009) with detection limits of 0.1 and 1.0 micromol per liter. Ammonium was measured fluorometrically with a detection limit of 0.5 micromol per liter based on (Holmes et al., 1999). Detection limits: nitrite (NO2) 0.1 micromol per liter, nitrate (NO3) 1.0 micromol per liter, amonnium (NH4) 0.5 micromol per liter. Average of the measurement of 2 replicates. | |
| 9 | Phosphorus in orthophosphate | P-[PO4]3- | µmol/l | Dähnke, Kirstin | measured in water column; Nutrient concentrations were analysed with a continuous flow analyser (AA3, Seal Analytics, Germany). For nitrite and nitrate analyses, standard photometric techniques were used (Grasshoff et al., 2009) with detection limits of 0.1 and 1.0 micromol per liter. Ammonium was measured fluorometrically with a detection limit of 0.5 micromol per liter based on (Holmes et al., 1999). Detection limits: nitrite (NO2) 0.1 micromol per liter, nitrate (NO3) 1.0 micromol per liter, amonnium (NH4) 0.5 micromol per liter. Average of the measurement of 2 replicates. | |
| 10 | Silicate, dissolved | DSi(OH)4 | µmol/l | Dähnke, Kirstin | measured in water column; Nutrient concentrations were analysed with a continuous flow analyser (AA3, Seal Analytics, Germany). For nitrite and nitrate analyses, standard photometric techniques were used (Grasshoff et al., 2009) with detection limits of 0.1 and 1.0 micromol per liter. Ammonium was measured fluorometrically with a detection limit of 0.5 micromol per liter based on (Holmes et al., 1999). Detection limits: nitrite (NO2) 0.1 micromol per liter, nitrate (NO3) 1.0 micromol per liter, amonnium (NH4) 0.5 micromol per liter. Average of the measurement of 2 replicates. | |
| 11 | Suspended particulate matter | SPM | mg/l | Dähnke, Kirstin | GF/F WHA1825047, Whatman, UK | masured in suspended particulate matter; SPM mass per volume (F_loaded-F_empty)/volume in water sample. Filter: Whatman GF/C, filtration method: vacuum filtration |
| 12 | Nitrogen, total | TN | % | Dähnke, Kirstin | Elemental analyzer (EA), Thermo Scientific, FlashEA 1112 | wt. %; masured in suspended particulate matter; Total carbon (TC) in suspended matter was determined with an Elemental Analyser (Thermo Flash EA 1112) calibrated against a certified acetanilide standard (IVA Analysentechnik, Germany). The standard deviation of C/N analysis was 0.05% for carbon. |
| 13 | Carbon, total | TC | % | Dähnke, Kirstin | Continuous flow analyser (AA3, Seal Analytics, Germany) | wt. %; masured in suspended particulate matter; Nutrient concentrations were analysed with a continuous flow analyser (AA3, Seal Analytics, Germany). For nitrite and nitrate analyses, standard photometric techniques were used (Grasshoff et al., 2009) with detection limits of 0.1 and 1.0 micromol per liter. Ammonium was measured fluorometrically with a detection limit of 0.5 micromol per liter based on (Holmes et al., 1999). Detection limits: nitrite (NO2) 0.1 micromol per liter, nitrate (NO3) 1.0 micromol per liter, amonnium (NH4) 0.5 micromol per liter. Average of the measurement of 2 replicates. |
| 14 | Carbon/Nitrogen ratio | C/N | Dähnke, Kirstin | Elemental analyzer (EA), Thermo Scientific, FlashEA 1112 | molar; masured in suspended particulate matter; C/N ratios were determined with an Elemental Analyser (Thermo Flash EA 1112) calibrated against a certified acetanilide standard (IVA Analysentechnik, Germany). The standard deviation of C/N analysis was 0.05% for carbon and 0.005% for nitrogen. | |
| 15 | δ15N, total nitrogen | δ15N TN | ‰ air | Dähnke, Kirstin | Element analyser, Carlo Erba NA2500, coupled with an isotope ratio mass spectrometerFinnigan MAT 252 | masured in suspended particulate matter; d15N-SPM was analysed with an element analyser (Carlo Erba NA 2500) coupled with an isotope ratio mass spectrometer (Finnigan MAT 252). All samples were analysed in replicate. Standards for d15N-SPM are IAEA N1, IAEA N2, and a certified sediment standard (IVA Analysentechnik, Germany). Standard deviation of standards and samples was <0.1 permille. |
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2723 data points
Download Data (login required; moratorium until 2025-07-06)
View dataset as HTML (shows only first 2000 rows)