Preprints
https://doi.org/10.5194/gmd-2020-408
https://doi.org/10.5194/gmd-2020-408

Submitted as: model description paper 06 Jan 2021

Submitted as: model description paper | 06 Jan 2021

Review status: this preprint is currently under review for the journal GMD.

MESMO 3: Flexible phytoplankton stoichiometry and refractory DOM

Katsumi Matsumoto, Tatsuro Tanioka, and Jacob Zahn Katsumi Matsumoto et al.
  • Department of Earth & Environmental Sciences, University of Minnesota, Minneapolis, Minnesota, USA

Abstract. We describe the third version of Minnesota Earth System Model for Ocean biogeochemistry (MESMO 3), an earth system model of intermediate complexity, with a dynamical ocean, a dynamic-thermodynamic sea ice, and an energy moisture balanced atmosphere. A major feature of Version 3 is the flexible C : N : P ratio for the three phytoplankton functional types represented in the model. The flexible stoichiometry is based on the power law formulation with environmental dependence on phosphate, nitrate, temperature, and light. Other new features include nitrogen fixation, water column denitrification, oxygen and temperature-dependent organic matter remineralization, and CaCO3 production based on the concept of the residual nitrate potential growth. Also, we describe the semi-labile and refractory dissolved organic pools of C, N, P, and Fe that can be enabled in MEMSO 3 as an optional feature. The refractory dissolved organic matter can be degraded by photodegradation at the surface and hydrothermal vent degradation at the bottom. These improvements provide a basis for using MESMO 3 in further investigations of the global marine carbon cycle to changes in the environmental conditions of the past, present, and future.

Katsumi Matsumoto et al.

Status: open (until 03 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Katsumi Matsumoto et al.

Model code and software

MESMO version 3.0 code Katsumi Matsumoto https://doi.org/10.5281/zenodo.4403605

Katsumi Matsumoto et al.

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Short summary
MESMO is a mathematical model that represents the essential components of Earth such as the global ocean, atmosphere, and sea ice. It is used to study the global climate and the global carbon cycle. We describe the third version of MESMO. A novel feature of the new version has mathematical representations of the chemical composition of marine phytoplankton and the marine dissolved organic matter, which are both recognized as important for the global ocean carbon cycle.