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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-90
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
12 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Description and evaluation of the Diat-HadOCC model v1.0: the ocean biogeochemical component of HadGEM2-ES
Ian Totterdell Met Office, Fitzroy Road, Exeter, EX1 3PB, UK
Abstract. The Diat-HadOCC model (version 1.0) is presented. A simple marine ecosystem model with coupled equations representing the marine carbon cycle, it formed the ocean biogeochemistry sub-model in the Met Office’s HadGEM2-ES Earth System Model. The equations are presented and described in full, along with the underlying assumptions, and particular attention is given to how they were implemented for the CMIP5 simulations. Results from the CMIP5 Historical simulation (particularly those for the simulated 1990s) are shown and compared to data: dissolved nutrients and dissolved inorganic carbon, as well as biological components, productivity and fluxes. Where possible, the amplitude and phase of the predicted seasonal cycle is evaluated. Since the model was developed to explore and predict the effects of climate change on the marine ecosystem and marine carbon cycle, the response of the model to the RCP8.5 future scenario is also shown. The model generally matches well the available nutrient and DIC datasets, but the model chlorophyll is higher than observed while the total primary production is just below the bottom of the range of global estimates. However, these quantities show realistic seasonal cycles.

Citation: Totterdell, I.: Description and evaluation of the Diat-HadOCC model v1.0: the ocean biogeochemical component of HadGEM2-ES, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-90, in review, 2017.
Ian Totterdell
Ian Totterdell
Ian Totterdell

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Short summary
The paper presents a complete description of version 1.0 of the Diat-HadOCC ocean biogeochemical model. A full set of equations is included, as are the parametrisations used and the rationale for choosing them. The model was developed to be a sub-model of the HadGEM2-ES Earth System model, which has been used to run a range of simulations for the 5th Climate Model Inter-Comparison Project (CMIP5). Results from those simulations are shown and compared to data (where available).
The paper presents a complete description of version 1.0 of the Diat-HadOCC ocean biogeochemical...
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