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Work Package 18: Feasibility study on purpose carbon storage
Leader: Gregor Rehder
Objectives
To determine the kinetics and phase-transfer reactions between liquid CO2, hydrate, and seawater from laboratory
experiments under high pressures.
To simulate the near-range dispersion of injected CO2 using these new kinetic constraints and improved
meso-scale models for CO2 injection in the deep ocean and at the sea floor
To prepare the simulation of the large-scale propagation of injected CO2 and the global oceans retention
efficiency (using these improved near-range constraints and a global high-resolution model)
To provide preliminary quantification of spatial scales for stress on marine biota due to deliberate CO2 injection.
Description of work
The high pressure laboratory of TU-HH will be used to measure the key controls on CO2 phase
transitions and solubility under controlled pressure, temperature, composition, and under both
bottom and liquid-liquid shear stress conditions. (partners 4, 14)
Results will be incorporated into the near-field models for:
(a) Water Column Injection (above 3000m): Beyond the current state of the art test framework
(mono-dispersed droplet plume model) we will develop a poly-dispersion model, which was
suggested to be more realistic.
(b) Seafloor Deposition of CO2: Here we will consider how small-scale processes (e.g., gradual
dissolution, instabilities due to breaking waves, and influence from benthic storms) interact with the
turbulent benthic boundary layer, topography, and remote forcing, to increase dissolution of CO2
and to let it escape away from a disposal site. We will formulate a seabed injection model and
simulate the absorption of liquid CO2 from a hydrate covered layer of CO2 on the sea floor when the
interface is subject to waves and when internal pressure gradients induced by densification of the
CO2-enriched water layer are included. (partners 1, 4, 6)
A high-resolution global model (¼ º x ¼ º) for simulations of the large-scale propagation will be
prepared for taking up the correct input parameterisations from the near-range simulations. (partners 1, 6) |
