Marín-Samper, Laura; Arístegui, Javier; Hernández-Hernández, Nauzet; Ortiz Cortes, Joaquin; Archer, Stephen; Ludwig, Andrea; Riebesell, Ulf (2024): KOSMOS 2021 Gran Canaria mesocosm study on ocean alkalinity enhancement: phytoplankton metabolic rates [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.964537
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Abstract:
Ocean Alkalinity Enhancement (OAE) could augment long-term carbon storage and mitigate ocean acidification by increasing the bicarbonate ion concentration in ocean water. However, the side effects and/or potential co-benefits of OAE on natural planktonic communities remain poorly understood. To address this knowledge gap, 9 mesocosms were deployed in the oligotrophic waters of Gran Canaria, from September 14th to October 16th, 2021. A CO2-equilibrated Total Alkalinity (TA) gradient was employed in increments of 300 µmol·L-1, ranging from ~2400 to ~4800 µmol·L-1. The carbonate chemistry conditions in terms of TA and Dissolved Inorganic Carbon (DIC), which were then used to calculate pCO2 and pH, and the nitrate+nitrite, phosphate and silicate concentrations were measured every two days over the course of the 33-day experiment alongside the following biotic parameters. Net Community Production (NCP), Gross Production (GP), Community Respiration (CR) rates, as well as the metabolic balance (GP:CR), were monitored every two days through oxygen production and consumption using the winkler method. Fractionated 14C uptake and chlorophyll a were also determined every four days although, initially, the total PO14C and DO14C production were also measured every 4 days, in between, up to day 13. Finally, flow cytometry was also carried out every two days and synecococcus, picoeukaryote and nanophytoplankton abundances were obtained. No damaging effect of CO2-equilibrated OAE in the range applied here, on phytoplankton primary production, community metabolism and composition could be inferred from our results. In fact, a potential co-benefit to OAE was observed in the form of the positive curvilinear response to the DIC gradient up to the ∆TA1800 treatment. Further experimental research at this scale is key to gain a better understanding of the short and long-term effects of OAE on planktonic communities.
Keyword(s):
Supplement to:
Marín-Samper, Laura; Arístegui, Javier; Hernández-Hernández, Nauzet; Ortiz Cortes, Joaquin; Archer, Stephen; Ludwig, Andrea; Riebesell, Ulf (in review): Assessing the impact of CO 2 equilibrated ocean alkalinity enhancement on microbial metabolic rates in an oligotrophic system. https://doi.org/10.5194/egusphere-2023-2409
Project(s):
Funding:
Helmholtz Association of German Research Centres (HGF), grant/award no. PIE-0021: Ocean-based carbon dioxide removal strategies
Horizon 2020 (H2020), grant/award no. 731065: Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean
Coverage:
Latitude: 27.990000 * Longitude: -15.368888
Date/Time Start: 2021-09-14T00:00:00 * Date/Time End: 2021-10-16T00:00:00
Event(s):
KOSMOS_2021_Mesocosm-M1 * Latitude: 27.990000 * Longitude: -15.368888 * Date/Time Start: 2021-09-14T00:00:00 * Date/Time End: 2021-10-16T00:00:00 * Location: Canarias Sea * Campaign: KOSMOS_2021 (KOSMOS Gran Canaria) * Method/Device: Mesocosm experiment (MESO)
KOSMOS_2021_Mesocosm-M2 * Latitude: 27.990000 * Longitude: -15.368888 * Date/Time Start: 2021-09-14T00:00:00 * Date/Time End: 2021-10-16T00:00:00 * Location: Canarias Sea * Campaign: KOSMOS_2021 (KOSMOS Gran Canaria) * Method/Device: Mesocosm experiment (MESO)
KOSMOS_2021_Mesocosm-M3 * Latitude: 27.990000 * Longitude: -15.368888 * Date/Time Start: 2021-09-14T00:00:00 * Date/Time End: 2021-10-16T00:00:00 * Location: Canarias Sea * Campaign: KOSMOS_2021 (KOSMOS Gran Canaria) * Method/Device: Mesocosm experiment (MESO)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
3828 data points
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