Publication Date:
2024-06-12
Description:
This data is part of the BMBF project CUSCO (Coastal Upwelling Systems in a Changing Ocean). Here we report the inorganic nutrient concentrations during a 35-day experiment, where we enclosed natural plankton communities in in-situ mesocosms off Peru. The experiment investigated the interactive effects of light and upwelling on the Humboldt upwelling ecosystem by mimicking a gradient of upwelling intensities (0%, 15%, 30%, 45% and 60%) under summer-time high light and winter-time low light. Integrated seawater samples from a depth between 0 and 10m were collected using a 5L Integrating Water sampler (IWS; Hydro-Bios, Kiel). Water samples for inorganic nutrients were filtered (0.45 µm PTFE syringe filter, Merck Millex) and analysed in triplicates. Dissolved inorganic nutrients (nitrate, nitrite, phosphate, and dissolved silica were determined using a spectrophotometer (ShimadzuV-1800) and standard colorimetric methods (Grasshoff et al., 2009; DOI: 10.1002/iroh.19850700232). Ammonium was determined fluorometrically. Due to the COVID-19 lockdown, we were not able to determine inorganic nutrients after day 17, and instead samples were frozen at -20°C after filtration and analysed with an autosampler (XY2 autosampler, SEAL Analytical) and a continuous flow analyzer (QuAAtro AutoAnalyzer, SEAL Analytical) connected to a fluorescence detector (FP-2020, JASCO).
Keywords:
Ammonium; AQUACOSM; Coastal Upwelling System in a Changing Ocean; Comment; CUSCO; DATE/TIME; Day of experiment; Depth, water, experiment, bottom/maximum; Depth, water, experiment, top/minimum; Event label; Field experiment; Humboldt Current System; inorganic nutrients; KOSMOS_2020; KOSMOS_2020_Mesocosm-M1; KOSMOS_2020_Mesocosm-M10; KOSMOS_2020_Mesocosm-M2; KOSMOS_2020_Mesocosm-M3; KOSMOS_2020_Mesocosm-M4; KOSMOS_2020_Mesocosm-M5; KOSMOS_2020_Mesocosm-M6; KOSMOS_2020_Mesocosm-M7; KOSMOS_2020_Mesocosm-M8; KOSMOS_2020_Mesocosm-M9; KOSMOS Peru; light limitation; MESO; Mesocosm experiment; Mesocosm label; mesocosm study; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean; Nitrate; Nitrate and Nitrite; Nitrite; Phosphate; Silicate; Treatment; Treatment: light condition; Type of study; Upwelling
Type:
Dataset
Format:
text/tab-separated-values, 2687 data points
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