# Help, research and resources

**URL:** https://systemco2.net/c/how-do-i/6.md

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## [All the marine carbonate system software](https://systemco2.net/t/all-the-marine-carbonate-system-software/16)

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**Author:** [@mvdh](https://systemco2.net/u/mvdh)\
**Replies:** 0\
**Last updated:** [19 March 2026 11:04 UTC](https://systemco2.net/t/all-the-marine-carbonate-system-software/16 "2026-03-19T11:04:36Z")

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Let’s try to make a list of all the different software tools out there, ideally with links to the software (including different versions), documentation, and the people who (have) develop(ed) it when they are members of …

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## [About the Help, research and resources category](https://systemco2.net/t/about-the-help-research-and-resources-category/8)

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**Author:** [@mvdh](https://systemco2.net/u/mvdh)\
**Replies:** 0\
**Last updated:** [10 March 2026 07:53 UTC](https://systemco2.net/t/about-the-help-research-and-resources-category/8 "2026-03-10T07:53:29Z")

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Ask for help with marine carbonate system calculations and share relevant research and resources. This can include questions about how to do something with one specific software tool as well as more general conceptual q…

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## [Seeking feedback on new Julia Carbonate Calculator](https://systemco2.net/t/seeking-feedback-on-new-julia-carbonate-calculator/31)

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**Author:** [@Sophie\_Elam](https://systemco2.net/u/Sophie_Elam)\
**Replies:** 1\
**Last updated:** [2 October 2026 12:13 UTC](https://systemco2.net/t/seeking-feedback-on-new-julia-carbonate-calculator/31 "2026-10-02T12:13:31Z")

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Hello all! Over in Cambridge we’ve been working on a package in Julia for carbonate system calculations and are at the point where it would be incredibly helpful to get feedback and input from experts & professionals suc…

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## [Total calcium affects saturation states but not equilibrium constants in (Py)CO2SYS](https://systemco2.net/t/total-calcium-affects-saturation-states-but-not-equilibrium-constants-in-py-co2sys/30)

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**Author:** [@mvdh](https://systemco2.net/u/mvdh)\
**Replies:** 1\
**Last updated:** [18 September 2026 23:28 UTC](https://systemco2.net/t/total-calcium-affects-saturation-states-but-not-equilibrium-constants-in-py-co2sys/30 "2026-09-18T23:28:19Z")

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The total calcium content is calculated internally in (Py)CO2SYS as a linear function of salinity, following either Riley & Tongudai (1967) or Culkin (1965) depending on the settings. In PyCO2SYS it’s also possible for …

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## [Understanding input and output conditions](https://systemco2.net/t/understanding-input-and-output-conditions/25)

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**Author:** [@mvdh](https://systemco2.net/u/mvdh)\
**Replies:** 0\
**Last updated:** [18 May 2026 10:37 UTC](https://systemco2.net/t/understanding-input-and-output-conditions/25 "2026-05-18T10:37:57Z")

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Understanding input and output conditions A useful feature of all CO2SYS software that can nonetheless cause confusion is calculations at “input” and “output” conditions; “conditions” refers to temperature and pressure. …