KOSMOS 2020 Peru mesocosm study on ecosystem responses to different light and upwelling intensities: dissolved inorganic carbon concentration and total alkalinity of water samples ...

• Main Authors: Thielecke, Antonia, Meyer, Jana, Ludwig, Andrea, Schulz, Kai Georg
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: DIC; Field experiment; Humboldt Current System; light limitation; mesocosm study; TA alkalinity; Upwelling; Type of study; Event label; Mesocosm label; Day of experiment; DATE/TIME; Depth, water, experiment, top/minimum; Depth, water, experiment, bottom/maximum; Treatment light condition; Treatment; Alkalinity, total; Carbon, inorganic, dissolved; Comment; Mesocosm experiment; Potentiometric titration, Metrohm 862 Compact Titrosampler; Automated Infra Red Inorganic Carbon Analyzer AIRICA, MARIANDA; with a LICOR detector LI-7000 CO2/H2O Analyzer; Gas chromatography - Mass spectrometry GC-MS; KOSMOS_2020; Coastal Upwelling System in a Changing Ocean CUSCO; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean AQUACOSM; Arctic
• Online Access: https://dx.doi.org/10.1594/pangaea.961215; https://doi.pangaea.de/10.1594/PANGAEA.961215

This data is part of the BMBF project CUSCO (Coastal Upwelling Systems in a Changing Ocean). Here we report the dissolved inorganic carbon concentration and total alkalinity 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). Dissolved inorganic carbon (DIC) and total alkalinity (TA) samples were obtained by 0.2µm gentle pressure filtration, poisoned with saturated 7.5 % mercury chloride (HgCl2) solution and frozen at -20°C until measurement. Samples for Total Alkalinity (TA) were measured by means of potentiometric titration with 0.05 M HCl using an automated titration device (862 ... : Mesocosm 10 describes the control sample from the PacificAs AIRICA data is more precise than GC-MS data, AIRICA data was used where availablelinear regression showed that GC-MS and AIRICA data linearly correlatefor days after T17 a linear conversion factor was applied to adjust GC-MS values: AIRICA=-1180+1.475*GCMS ...