Schartau, Markus , Pahlow, Markus, Kemena, Tronje Peer , Lampe, Vanessa , Taucher, Jan and Seifert, Miriam (2024) New/refined parameterizations for modelling ocean alkalinization effects on biogeochemistry and plankton dynamics. . OceanNets Deliverable, D5.8 . OceanNETs, Kiel, Germany, 34 pp. DOI 10.3289/oceannets_d5.8.

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Abstract

In this report the potential effects of pulsed ocean alkalinity enhancement (OAE) on plankton
growth dynamics, efficacy and carbon dioxide removal (CDR) are simulated at an oligotrophic
site nearby the Canary Islands (Spain). Parameterizations of how phytoplankton and bacterial
growth respond to variations in carbonate chemistry are introduced and applied. The model
resolves vertical profiles within a 420 km2 area of OAE, and within a 2.05×105 km2 surrounding
region. Both areas are connected and lateral dispersion causes a horizontal exchange of
chemical and biological tracers. The analysis comprises 32 pulsed OAE scenarios of varying
intensities and frequencies of alkalinity addition. The intensities of OAE are derived as
fractions of total CaO available for OAE in Europe, from 0.05 % (low), 0.1 % (moderate), 0.2 %
(high) and 0.4 % (extreme). These four intensities are co-varied with four frequencies of OAE:
monthly, seasonal, annual-winter, and annual-summer deployments. The study shows how
much the frequency of the OAE influences the efficacies determined locally and remotely. The
model results also provide some first insight of potential OAE effects on biological production.

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