PANGAEA_996209
KOSMOS 2023 Helgoland mesocosm study on ocean alkalinity enhancement: phytoplankton and microzooplankton abundance and biomass data
Petric, Svetlana; Faucher, Giulia; Riebesell, Ulf
KOSMOS 2023 Helgoland mesocosm study on ocean alkalinity enhancement: phytoplankton and microzooplankton abundance and biomass data
2026-07-31
PANGAEA
Dataset
https://doi.pangaea.de/10.1594/PANGAEA.996209
Investigator
Svetlana
Petric
spetric@geomar.de
Earth Science
Type of study
Event label
Sample code/label
DATE/TIME
Day of experiment
Treatment: dilution type
Treatment
Treatment: alkalinity, total
Alkalinity, total
Carbon, inorganic, dissolved
pH
Fugacity of carbon dioxide in seawater
Salinity
Temperature, water
Species
Species, unique identification
Functional group
Cell
Biomass as carbon per volume
geoscientificInformation
Abundance
Biomass
ciliates
community composition
Community composition and diversity
diatoms
Dinoflagellates
enhancement
Field experiment
Helgoland
KOSMOS_2023
KOSMOS_2023_Mesocosm-M1
KOSMOS_2023_Mesocosm-M11
KOSMOS_2023_Mesocosm-M3
KOSMOS_2023_Mesocosm-M5
KOSMOS_2023_Mesocosm-M7
KOSMOS_2023_Mesocosm-M9
Marine Carbon Dioxide Removal (mCDR)
mesocosm
mesocosm experiment
Mesocosm experiment
mesocosm study
microscopy
microzooplankton
North Sea
ocean alkalinity enhancement
Ocean Alkalinity Enhancement (OAE)
Phytoplankton
Phytoplankton biomass
Phytoplankton bloom
spring bloom
Titration device, Metrohm, 862 Compact Titrosampler [with built-in PT1000 temperature sensor]
Automated Infra Red Inorganic Carbon Analyzer (AIRICA), MARIANDA; coupled with Differential infrared gas analyzer, LI-COR Biosciences, LI-7000
Calculated using the CO2sys_v3.0 software (Pierrot et al. 2021)
CTD 60M multiparameter probe (Sea & Sun Technology GmbH, Germany)
Reference in WoRMS
Calculated
Microscopy
2023-03-16
2023-04-21
Complete
54.18330000000001
54.18330000000001
7.8999999999999995
7.8999999999999995
RETAKE
DAM CDRmare - RETAKE: CO2 removal by alkalinity enhancement: potential, benefits and risks
OceanAlkAlign
Ocean Alk-Align
CDRmare
Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways
access rights needed
CC-BY-4.0: Creative Commons Attribution 4.0 International (License comes into effect after moratorium ends)
English
PANGAEA
Data Publisher for Earth & Environmental Science
https://www.pangaea.de/
Data Center Contact
Michael
Diepenbroek
info@pangaea.de
Leobener Str.
Bremen
Bremen
28359
Germany
online
58140 data points
text/tab-separated-values
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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.996209"!
http://en.wikipedia.org/wiki/ISO_8601
DATE/TIME
http://invabio.wdc-mare.org/mesocubi.jpg
Mesocosm experiment
https://alkalign.ocean.dal.ca/
OceanAlkAlign
https://cdrmare.de/en/
CDRmare
https://en.wikipedia.org/wiki/Species
Species
https://github.com/dpierrot/co2sys_xl
Calculated using the CO2sys_v3.0 software (Pierrot et al. 2021)
https://retake.cdrmare.de/en/
RETAKE
https://www.marinespecies.org
Reference in WoRMS
DIF
9.4
2026-07-31
2026-07-31