Also known as
Model type Single
Model part of larger framework
Note on status model
Date note status model
Incorporated models or components:
Spatial dimensions 1D
Spatial extent Regional-Scale
Model domain Marine
One-line model description Routines to model the ocean carbonate system
Extended model description Fortran 95 routines to model the ocean carbonate system (mocsy). Mocsy take as input dissolved inorganic carbon CT and total alkalinity AT, the only two tracers of the ocean carbonate system that are unaffected by changes in temperature and salinity and conservative with respect to mixing, properties that make them ideally suited for ocean carbon models. With basic thermodynamic equilibria, mocsy compute surface-ocean pCO2 in order to simulate air-sea CO2 fluxes. The mocsy package goes beyond the OCMIP code by computing all other carbonate system variables (e.g., pH, CO32-, and CaCO3 saturation states) and by doing so throughout the water column.

Ocean carbonate system,

Name James Orr
Type of contact
Institute / Organization Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CEA-CNRS-UVSQ
Postal address 1
Postal address 2
Town / City Gif-sur-Yvette
Postal code 91191
Country France
Email address

Supported platforms
Unix, Linux, Mac OS, Windows
Other platform
Programming language

Other program language Fortran95
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 2013
Does model development still take place? Yes
If above answer is no, provide end year model development
Code development status
When did you indicate the 'code development status'?
Model availability As code
Source code availability
(Or provide future intension)
Through web repository
Source web address
Source csdms web address
Program license type BSD or MIT X11
Program license type other
Memory requirements --
Typical run time --

Describe input parameters dissolved inorganic carbon (DIC), total alkalinity (Alk), temperature, and salinity as well as concentrations of total dissolved inorganic phosphorus and silicon concentrations.
Input format Binary
Other input format
Describe output parameters Compute all carbonate system variables
Output format Binary
Other output format
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software
Visualization software needed? No
If above answer is yes
Other visualization software

Describe processes represented by the model --
Describe key physical parameters and equations --
Describe length scale and resolution constraints --
Describe time scale and resolution constraints --
Describe any numerical limitations and issues --

Describe available calibration data sets --
Upload calibration data sets if available:
Describe available test data sets --
Upload test data sets if available:
Describe ideal data for testing --

Do you have current or future plans for collaborating with other researchers? --
Is there a manual available? No
Upload manual if available:
Model website if any
Model forum / discussion board

This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No not possible
PyMT component
Is this a data component
Can be coupled with:
Model info
James Orr
Nr. of publications: 2
Total citations: 86
h-index: 2
m-quotient: 0.2
Qrcode Mocsy.png
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Nr. of publications: 2
Total citations: 86
h-index: 2
m-quotient: 0.2

Featured publication(s)YearModel describedType of ReferenceCitations
Orr, J. C.; Epitalon, J.-M.; 2014. Improved routines to model the ocean carbonate system: mocsy 1.0. Geoscientific Model Development Discussions, 7, 2877–2902. 10.5194/gmdd-7-2877-2014
(View/edit entry)
2014 Mocsy
Model overview 10
Orr, J. C.; Epitalon, J.-M.; 2015. Improved routines to model the ocean carbonate system: mocsy 2.0. Geoscientific Model Development, 8, 485–499. 10.5194/gmd-8-485-2015
(View/edit entry)
2015 Mocsy
Model overview 76
See more publications of Mocsy



Input Files

Output Files