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    Publication Date: 2023-08-09
    Description: 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.
    Keywords: Carbon, total; Carbon/Nitrogen ratio; Continuous flow analyser (AA3, Seal Analytics, Germany); DATE/TIME; DEPTH, water; Elemental analyzer (EA), Thermo Scientific, FlashEA 1112; Element analyser, Carlo Erba NA2500, coupled with an isotope ratio mass spectrometerFinnigan MAT 252; Fluorescence measurement (OPA), with auto-analyser; Geesthacht weir, Germany; GF/F WHA1825047, Whatman, UK; GW2011-2016_Stat_1; Helmholtz-Zentrum Hereon; Hereon; 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; Nitrogen, total; Nitrogen in ammonium; Nitrogen in nitrate; Nitrogen in nitrite; Phosphorus in orthophosphate; Sample ID; Silicate, dissolved; Suspended particulate matter; Water sample; WS; δ15N, nitrate; δ15N, total nitrogen; δ18O, nitrate
    Type: Dataset
    Format: text/tab-separated-values, 2723 data points
    Location Call Number Expected Availability
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  • 4
    Publication Date: 2024-02-06
    Description: We measured dissolved and particular inorganic nitrogen and dissolved nitrous oxide concentration in the Ems estuary (Germany). The sampling campaign was conducted on two consecutive days in June 2020 (11.06.2020– 12.06.2020) on board of the German research vessel Ludwig Prandtl. Water samples were taken approximately every 20 min during ebb tide from the North Sea around the island Borkum upstream to Papenburg. The discrete water samples were used to measure dissolved inorganic nutrient, nitrate stable isotope composition, suspended particular matter (SPM) concentration, particular carbon and nitrogen content of SPM and nitrogen stable isotope composition of SPM. An onboard membrane pump provided the on-line in situ FerryBox system with water from 2 m below the surface. It continuously measured oxygen, salinity, and temperature during our cruise. A N2O analyzer coupled (Model 914-0022, Los Gatos Res. Inc., San Jose, CA, USA) with a sea water/gas equilibrator using off-axis cavity output spectroscopy continuously detected dry mole fraction of dissolved nitrous oxide along the estuary. The aims of the study were 1) to investigate spatial dynamics in nitrogen turnover processes along the Ems estuary, 2) to identify their relation to nitrous oxide production and 3) to unravel controlling factors of the nitrogen circle.
    Keywords: Carbon, organic, particulate; Carbon, total, particulate; Carbon/Nitrogen ratio; Continuous flow analyser (AA3, Seal Analytics, Germany); Date/Time of event; DEPTH, water; Elemental analyser; Element analyser, Carlo Erba NA2500, coupled with an isotope ratio mass spectrometerFinnigan MAT 252; Ems estuary; Event label; Helmholtz-Zentrum Hereon; Hereon; Latitude of event; Longitude of event; LP20200602; LP20200602_Underway_station_700; LP20200602_Underway_station_701; LP20200602_Underway_station_702; LP20200602_Underway_station_703; LP20200602_Underway_station_704; LP20200602_Underway_station_705; LP20200602_Underway_station_706; LP20200602_Underway_station_707; LP20200602_Underway_station_708; LP20200602_Underway_station_709; LP20200602_Underway_station_710; LP20200602_Underway_station_711; LP20200602_Underway_station_712; LP20200602_Underway_station_713; LP20200602_Underway_station_716; LP20200602_Underway_station_717; LP20200602_Underway_station_718; LP20200602_Underway_station_719; LP20200602_Underway_station_720; LP20200602_Underway_station_721; LP20200602_Underway_station_722; LP20200602_Underway_station_723; LP20200602_Underway_station_724; LP20200602_Underway_station_725; LP20200602_Underway_station_726; LP20200602_Underway_station_727; LP20200602_Underway_station_728; Ludwig Prandtl; 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; N2O analyzer (Los Gatos Research, Model 914-0022, LGR); Nitrogen, particulate; Nitrogen in ammonium; Nitrogen in nitrate; Nitrogen in nitrite; Nitrous oxide; Nitrous oxide saturation; On-line-in-situ FerryBox-System (Pertersen et al. 2001); Oxygen; Phosphorus in orthophosphate; Salinity; Sample ID; Sample method; Silicate, dissolved; Suspended particulate matter; Temperature, water; Water sample; WS; δ15N; δ15N, nitrate; δ18O, nitrate
    Type: Dataset
    Format: text/tab-separated-values, 682 data points
    Location Call Number Expected Availability
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