Description: This dataset contains species-resolved phytoplankton and microzooplankton abundance and biomass data from the KOSMOS 2023 Helgoland mesocosm experiment conducted in the coastal waters off Helgoland Island in the North Sea, Germany. The experiment investigated the effects of Ocean Alkalinity Enhancement (OAE) on plankton communities during the development of a natural spring bloom. Six mesocosms (~6 m³) were subjected to an immediate dilution OAE scenario, establishing an alkalinity enhancement gradient ranging from ΔTA 0 to 1250 µmol kg⁻¹ in increments of 250 µmol kg⁻¹ through calcium-based alkalinity addition. The dataset includes taxonomically resolved phytoplankton and microzooplankton abundance (cells mL⁻¹), carbon biomass (µg C L⁻¹), functional group classifications, and World Register of Marine Species (WoRMS) taxonomic identifiers. Associated carbonate chemistry measurements, including total alkalinity (TA), dissolved inorganic carbon (DIC), pH, fugacity of carbon dioxide (fCO₂), salinity, temperature, and calculated ΔTA values are provided for each sampling event.
Global identifier:
Doi(
"10.1594/PANGAEA.996209",
)
DataMeasurements(
DataMeasurements {
domain: Unspecified,
station: None,
measured_variables: [
"Alkalinity, total",
"Biomass as carbon per volume",
"Carbon, inorganic, dissolved",
"Cell",
"DATE/TIME",
"Day of experiment",
"Event label",
"Fugacity of carbon dioxide in seawater",
"Functional group",
"Salinity",
"Sample code/label",
"Species",
"Species, unique identification",
"Temperature, water",
"Treatment",
"Treatment: alkalinity, total",
"Treatment: dilution type",
"Type of study",
"pH",
],
methods: [
"Automated Infra Red Inorganic Carbon Analyzer (AIRICA), MARIANDA; coupled with Differential infrared gas analyzer, LI-COR Biosciences, LI-7000",
"CTD 60M multiparameter probe (Sea & Sun Technology GmbH, Germany)",
"Calculated",
"Calculated using the CO2sys_v3.0 software (Pierrot et al. 2021)",
"Microscopy",
"Reference in WoRMS",
"Titration device, Metrohm, 862 Compact Titrosampler [with built-in PT1000 temperature sensor]",
],
},
)
Tags: Helgoland ? Diatomeen ? Kohlenstoff ? Phytoplankton ? Wassertemperatur ? Würmer ? Deutschland ? Gesamtkohlenstoff ? Kohlendioxid ? Küstengewässer ? Mikroskopie ? Plankton ? Temperatur ? Insel ? Salzgehalt ? Studie ? Wasserprobe ? Wimpertierchen ? Meeresgewässer ? Daten ? Biomasse ? Freilandversuch ? Klassifikation ? Nordsee ? Community composition and diversity ? Ocean Alkalinity Enhancement (OAE) ? Phytoplankton biomass ? Phytoplankton bloom ? community composition ? enhancement ? mesocosm ? mesocosm experiment ? mesocosm study ? microzooplankton ? ocean alkalinity enhancement ? spring bloom ? Abundance ? Dinoflagellates ? Marine Carbon Dioxide Removal (mCDR) ?
Bounding boxes: 7.8999999999999995° .. 7.8999999999999995° x 54.18330000000001° .. 54.18330000000001°
License: Creative Commons Namensnennung 4.0 (Data access requires registration)
Language: Englisch/English
Issued: 2026-07-31
Modified: 2026-07-31
Last harvest: 13.08.2026 02:17
Time ranges: 2023-03-16 - 2023-04-21
Accessed 1 times.