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  • 1
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    KOSMOS 2020 Peru mesocosm study on ecosystem responses to different light and upwelling intensities: oxygen primary production rates of water samples (2023)
    PANGAEA
    Details
    Publication Date: 2024-06-24
    Description: This data is part of the BMBF project CUSCO (Coastal Upwelling Systems in a Changing Ocean). Here we report oxygen primary production rates 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). Oxygen production as well as respiration rates were measured as described in Ortiz et al. (2022; doi:10.3389/fmars.2021.743105) using the Winkler method. For each mesocosm and sampling day samples for initial oxygen values fixed immediately after subsampling ("Initial"), dark incubations ("Dark") and light incubations ("Light") were measured. All samples were incubated with constant light dark/cycles and temperature was adjusted regularly to mesocosm values. After incubation samples were fixed and titrated by means of an automated, precise titration system with colorimetric end-point detection along with the initials (Dissolved Oxygen Analyzer, SIS Schwentinental, Germany). Community respiration (CR) was calculated as the oxygen consumption during dark incubation per hour. Net community production (NCP) was the oxygen production per hour in the light samples and gross production (GP) the sum of CR and NCP.
    Keywords: AQUACOSM; Coastal Upwelling System in a Changing Ocean; CUSCO; DATE/TIME; Day of experiment; Depth, water, experiment, bottom/maximum; Depth, water, experiment, top/minimum; Event label; Field experiment; Gross community production of oxygen; Humboldt Current System; 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; Net community production of oxygen; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean; oxygen consumption; primary production; Respiration rate, oxygen, community; Titration, Winkler; Treatment; Treatment: light condition; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 972 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    KOSMOS 2018 Gran Canaria mesocosm study: dissolved organic matter (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-14
    Description: This dataset contains the dissolved organic matter (DOM) quantification and optical characterisation results from a KOSMOS mesocosm experiment carried out in the framework of the Ocean Artificial Upwelling project. The experiment was carried out in the autumn of 2018 in the oligotrophic waters of Gran Canaria. During the 39 days of experiment nutrient-rich deep water was added to the mesocosms in two modes (singular vs recurring additions), with four levels of intensity. Dissolved organic carbon, nitrogen and phosphorus were quantified with a Shimadzu TOC-5000 and a QuAAtro AutoAnalyzer. The absorption and fluorescence proprieties of DOM were determined making use of an Ocean Optics USB2000+UV-VIS-ES Spectrometer and a Jobin Yvon Horiba Fluoromax-4 spectrofluorometer, respectively. The aim of this dataset was to study the effect of artificial upwelling on the dissolved organic matter pool and its potential implications for carbon sequestration.
    Keywords: Absorption coefficient, 254 nm; Absorption coefficient, 325 nm; artificial upwelling; Biogeochemical impact of mesoscale and sub-mesoscale processes along the life history of cyclonic and anticyclonic eddies: plankton variability and productivity; Calculated; Canarias Sea; Carbon, organic, dissolved; Carbon, organic, dissolved/Nitrogen, organic, dissolved ratio; Carbon, organic, dissolved/Phosphorus, organic, dissolved ratio; carbon sequestration; chromophoric dissolved organic matter; DATE/TIME; Day of experiment; Dissolved Organic Carbon; Dissolved Organic Matter; dissolved organic nitrogen; dissolved organic phosphorus; e-IMPACT; Event label; Fluorescence intensity, maximum, component 1; Fluorescence intensity, maximum, component 2; Fluorescence intensity, maximum, component 4; Fluorescence intensity, maximum, component 5; fluorescent dissolved organic matter; Jobin Yvon Horiba Fluoromax-4 spectrofluorometer; KOSMOS_2018; KOSMOS_2018_Mesocosm-A; KOSMOS_2018_Mesocosm-DW; KOSMOS_2018_Mesocosm-M1; KOSMOS_2018_Mesocosm-M2; KOSMOS_2018_Mesocosm-M3; KOSMOS_2018_Mesocosm-M4; KOSMOS_2018_Mesocosm-M5; KOSMOS_2018_Mesocosm-M6; KOSMOS_2018_Mesocosm-M7; KOSMOS_2018_Mesocosm-M8; KOSMOS_2018_Mesocosm-M9; KOSMOS Gran Canaria; MESO; Mesocosm experiment; Mesocosm label; mesocosm study; Nitrogen, organic, dissolved; Nitrogen, organic, dissolved/Phosphorus, organic, dissolved ratio; Ocean Artificial Upwelling; Ocean-artUp; Ocean Optics USB2000+UV-VIS-ES Spectrometer; Phosphorus, organic, dissolved; PUMP; QuAAtro AutoAnalyzer; Shimadzu Total Organic Carbon Analyzer (TOC-5000A); Slope ratio; Spectral slope, 275-295 nm; Spectral slope, 350-400 nm; Treatment; Treatment: nutrients; TRIATLAS; Tropical and South Atlantic climate-based marine ecosystem predictions for sustainable management; Water pump
    Type: Dataset
    Format: text/tab-separated-values, 3962 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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