Abstract
Abstract. We introduce a time-dependent, one-dimensional model of
early diagenesis that we term RADI, an acronym accounting for the main
processes included in the model: chemical reactions, advection, molecular
and bio-diffusion, and bio-irrigation. RADI is targeted for study of
deep-sea sediments, in particular those containing calcium carbonates
(CaCO3). RADI combines CaCO3 dissolution driven by organic matter
degradation with a diffusive boundary layer and integrates state-of-the-art
parameterizations of CaCO3 dissolution kinetics in seawater, thus
serving as a link between mechanistic surface reaction modeling and
global-scale biogeochemical models. RADI also includes CaCO3
precipitation, providing a continuum between CaCO3 dissolution and
precipitation. RADI integrates components rather than individual chemical
species for accessibility and is straightforward to compare against
measurements. RADI is the first diagenetic model implemented in Julia, a
high-performance programming language that is free and open source, and it
is also available in MATLAB/GNU Octave. Here, we first describe the
scientific background behind RADI and its implementations. Following this, we evaluate
its performance in three selected locations and explore other potential
applications, such as the influence of tides and seasonality on early
diagenesis in the deep ocean. RADI is a powerful tool to study the
time-transient and steady-state response of the sedimentary system to
environmental perturbation, such as deep-sea mining, deoxygenation, or
acidification events.
Funder
Netherlands Earth System Science Centre
McGill University
National Aeronautics and Space Administration
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