CANOPS-GRB v1.0: a new Earth system model for simulating the evolution of ocean–atmosphere chemistry over geologic timescales
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Published:2022-10-20
Issue:20
Volume:15
Page:7593-7639
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Ozaki KazumiORCID, Cole Devon B., Reinhard Christopher T., Tajika Eiichi
Abstract
Abstract. A new Earth system model of intermediate complexity – CANOPS-GRB v1.0 –
is presented for use in quantitatively assessing the dynamics and stability
of atmospheric and oceanic chemistry on Earth and Earth-like planets over
geologic timescales. The new release is designed to represent the coupled
major element cycles of C, N, P, O, and S, as well as the global redox
budget (GRB) in Earth's exogenic (ocean–atmosphere–crust) system, using a
process-based approach. This framework provides a mechanistic model of the
evolution of atmospheric and oceanic O2 levels on geologic timescales
and enables comparison with a wide variety of geological records to further
constrain the processes driving Earth's oxygenation. A complete detailed
description of the resulting Earth system model and its new features are
provided. The performance of CANOPS-GRB is then evaluated by comparing a
steady-state simulation under present-day conditions with a comprehensive
set of oceanic data and existing global estimates of bio-element cycling.
The dynamic response of the model is also examined by varying phosphorus
availability in the exogenic system. CANOPS-GRB reliably simulates the
short- and long-term evolution of the coupled C–N–P–O2–S biogeochemical
cycles and is generally applicable across most period of Earth's history
given suitable modifications to boundary conditions and forcing regime. The
simple and adaptable design of the model also makes it useful to interrogate
a wide range of problems related to Earth's oxygenation history and
Earth-like exoplanets more broadly. The model source code is available on
GitHub and represents a unique community tool for investigating the
dynamics and stability of atmospheric and oceanic chemistry on long
timescales.
Funder
NASA Astrobiology Institute Japan Society for the Promotion of Science
Publisher
Copernicus GmbH
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