de.pangaea.dataset996213
und
dataset
PANGAEA
info@pangaea.de
https://www.pangaea.de/
information
pointOfContact
2026-07-27T10:55:42Z
https://doi.pangaea.de/10.1594/PANGAEA.996213
<gco:CharacterString>KOSMOS 2023 Helgoland mesocosm study on ocean alkalinity enhancement: Microbial metabolic rates</gco:CharacterString>
2026-07-27T10:54:04
publication
Marín-Samper, Laura
laura.marin@ulpgc.es
https://orcid.org/0000-0002-6825-0992
information
author
Arístegui, Javier
javier.aristegui@ulpgc.es
https://orcid.org/0000-0002-7526-7741
information
author
Faucher, Giulia
gfaucher@geomar.de
https://orcid.org/0000-0001-8930-477X
information
author
Kittu, Leila
lkittu@geomar.de
https://orcid.org/0000-0002-3986-8179
information
author
Boersma, Maarten
maarten.boersma@awi.de
https://orcid.org/0000-0003-1010-026X
information
author
Riebesell, Ulf
uriebesell@geomar.de
https://orcid.org/0000-0002-9442-452X
information
author
PANGAEA
info@pangaea.de
https://www.pangaea.de/
information
publisher
tableDigital
Ocean alkalinity enhancement (OAE) is a marine carbon dioxide removal (mCDR) approach that can also mitigate ocean acidification. However, its biological impacts are expected to depend on the magnitude, timing, and dilution of alkalinity additions. To investigate these factors, a mesocosm experiment simulated hydrated lime additions using two six-level alkalinity gradients (up to ΔTA 1250 µmol kg⁻¹): one with immediate full-column mixing and another with mixing delayed by two days. These treatments simulated rapid (e.g. from a moving vessel in open ocean) and slow (e .g. point source or land-based applications in poorly mixed environments)dilution scenarios, representing different hydrodynamic conditions that may occur following real-world alkalinity additions. Gross production (GP), net community production (NCP) and community respiration (CR), determined from in vitro oxygen production and consumption, together with chlorophyll a, were monitored over a 35-day period. Spring bloom initiation was delayed non-linearly at low fCO₂, with reduced absolute and biomass-normalized production occurring in treatments exposed to fCO₂ below ~70 and 30 µatm respectively. These findings indicate that phytoplankton communities may be generally resilient to realistic OAE scenarios while helping to define ecologically relevant fCO₂ thresholds for safe OAE deployment.
completed
Marín-Samper, Laura
laura.marin@ulpgc.es
https://orcid.org/0000-0002-6825-0992
information
principalInvestigator
metabolic rates
ocean alkalinity enhancement
Ocean Alkalinity Enhancement (OAE)
Phytoplankton
Primary production
theme
<gco:CharacterString>PANGAEA Keyword List</gco:CharacterString>
1995-01-01
creation
PANGAEA
info@pangaea.de
https://www.pangaea.de/
information
pointOfContact
RETAKE
DAM CDRmare - RETAKE: CO2 removal by alkalinity enhancement: potential, benefits and risks
OceanAlkAlign
Ocean Alk-Align
OceanNETs
Ocean-based Negative Emission Technologies
CDRmare
Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways
theme
<gco:CharacterString>PANGAEA Project List</gco:CharacterString>
1995-01-01
creation
PANGAEA
info@pangaea.de
https://www.pangaea.de/
information
pointOfContact
copyright
restricted
copyright
CC-BY-4.0: Creative Commons Attribution 4.0 International (License comes into effect after moratorium ends)
textTable
und
geoscientificInformation
7.900000000000001
7.900000000000001
54.183300000000024
54.183300000000024
2023-03-14T00:00:00
2023-04-17T00:00:00
Type of study
thematicClassification
Event label
thematicClassification
Day of experiment
physicalMeasurement
day
day
DATE/TIME
thematicClassification
Identification number
thematicClassification
Mesocosm number
Treatment: dilution type
thematicClassification
Dil_Treat
Treatment: alkalinity, total
physicalMeasurement
Delta_TA
µmol/kg
µmol/kg
Treatment
thematicClassification
Sample code/label
thematicClassification
Respiration rate, oxygen, community
physicalMeasurement
CR: Community Respiration (amount of oxygen respired in the dark)
µmol/l/day
µmol/l/day
Net community production of oxygen
physicalMeasurement
µmol/l/day
µmol/l/day
Gross community production of oxygen
physicalMeasurement
µmol/l/day
µmol/l/day
Balance
thematicClassification
GPR: Metabolic Balance = GCP/CR
Depth, description
thematicClassification
text/tab-separated-values
unknown
https://doi.pangaea.de/10.1594/PANGAEA.996213?format=textfile
download
dataset
The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data.
EVENT LABEL: KOSMOS_2023_Mesocosm-M1 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M2 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M3 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M4 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M5 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M6 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M7 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M8 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M9 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M10 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M11 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
2023-03-14T00:00:00
EVENT LABEL: KOSMOS_2023_Mesocosm-M12 * LATITUDE: 54.183300 * LONGITUDE: 7.900000 * DATE/TIME START: 2023-03-14T00:00:00 * DATE/TIME END: 2023-04-21T00:00:00 * LOCATION: Helgoland * CAMPAIGN: KOSMOS_2023 * METHOD/DEVICE: Mesocosm experiment
delayed treatment
2023-03-14T00:00:00
Related to
<gco:CharacterString>Microbial metabolic rates under ocean alkalinity enhancement: A step towards a safe operating space</gco:CharacterString>
Marín-Samper, Laura
laura.marin@ulpgc.es
https://orcid.org/0000-0002-6825-0992
information
author
Arístegui, Javier
javier.aristegui@ulpgc.es
https://orcid.org/0000-0002-7526-7741
information
author
Faucher, Giulia
gfaucher@geomar.de
https://orcid.org/0000-0001-8930-477X
information
author
Kittu, Leila
lkittu@geomar.de
https://orcid.org/0000-0002-3986-8179
information
author
Boersma, Maarten
maarten.boersma@awi.de
https://orcid.org/0000-0003-1010-026X
information
author
Riebesell, Ulf
uriebesell@geomar.de
https://orcid.org/0000-0002-9442-452X
information
author
documentHardcopy
Communications Earth & Environment