Muri, Helene and Sathyanadh, Anusha (2024) Report on carbon cycle interactions and efficacy of land-based CDRs (e.g. BECCS), when combined with oceanic CDRs (individually or in a portfolio). . OceanNets Deliverable, D4.8 . OceanNETs, Kiel, Germany, 23 pp. DOI 10.3289/oceannets_d4.8.

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Abstract

In this deliverable 4.8, we analyze the Norwegian Earth System Model (NorESM) simulations
from Deliverable 4.6 and 4.7 on land-based and ocean-based Carbon Dioxide Removal (CDR)
scenarios. We focus the analysis on BioEnergy coupled to CCS (BECCS) using sugarcane as
feedstock, and ocean alkalinity enhancement (OAE), applied individually and in combinations.
We find that a higher amount of carbon captured by making use of the carbon sequestration
potential of land and ocean together, as expected. The sugarcane yield is unaffected by the OAE
deployment, however, carbon uptake by other parts of the land is somewhat reduced by OAE
in the combined BECCS and OAE case. Less carbon is taken up by the oceans during BECCS
deployment, whilst less carbon is taken up by land during the OAE deployment. The uptake
of carbon by the oceans in the combined BECCS and OAE case is directly additive from the
individual cases. However, some non-linear responses are seen in other parts of the climate
responses.

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