# Latest **URL:** https://systemco2.net/latest.md [Latest](https://systemco2.net/latest.md) · [Categories](https://systemco2.net/categories.md) · [Tags](https://systemco2.net/tags.md) --- ## [Introduce yourself](https://systemco2.net/t/introduce-yourself/11)
**Author:** [@mvdh](https://systemco2.net/u/mvdh)\ **Replies:** 16\ **Last updated:** [4 August 2026 16:50 UTC](https://systemco2.net/t/introduce-yourself/11 "2026-08-04T16:50:47Z")
After joining SystemCO2, please feel free to introduce yourself and your interest in the marine carbonate system by replying to this thread! I’m Matthew Humphreys, a scientist at the NIOZ Royal Netherlands Institute fo… --- ## [Welcome to SystemCO₂! 👋](https://systemco2.net/t/welcome-to-systemco/5)
**Author:** [@system](https://systemco2.net/u/system)\ **Replies:** 1\ **Last updated:** [17 March 2026 20:50 UTC](https://systemco2.net/t/welcome-to-systemco/5 "2026-03-17T20:50:02Z")
We are so glad you joined us. SystemCO2 is a discussion forum for users and developers of software tools for solving the marine carbonate system. It’s a place to ask for help and assist others with using those tools, s… --- ## [Vapor pressure correction best practices](https://systemco2.net/t/vapor-pressure-correction-best-practices/34)
**Author:** [@Daniel\_Sandborn](https://systemco2.net/u/Daniel_Sandborn)\ **Replies:** 2\ **Last updated:** [22 October 2026 13:05 UTC](https://systemco2.net/t/vapor-pressure-correction-best-practices/34 "2026-10-22T13:05:25Z")
I’ve been struggling to interpret the best practice in use of two different water vapor pressure parameterizations as they pertain to CO2SYS and related estimation routines (my TRACE in particular). Hopefully some more e… --- ## [ICDC12 mini workshop](https://systemco2.net/t/icdc12-mini-workshop/33)
**Author:** [@mvdh](https://systemco2.net/u/mvdh)\ **Replies:** 3\ **Last updated:** [14 October 2026 07:35 UTC](https://systemco2.net/t/icdc12-mini-workshop/33 "2026-10-14T07:35:01Z")
Is anyone planning to go to the International Carbon Dioxide Conference (ICDC12) in Exeter next June? The call for abstracts is now open, including for mini-workshops, and I was thinking about submitting a proposal to r… --- ## [Seeking feedback on new Julia Carbonate Calculator](https://systemco2.net/t/seeking-feedback-on-new-julia-carbonate-calculator/31)
**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")
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… --- ## [PyCO2SYS v2 beta version](https://systemco2.net/t/pyco2sys-v2-beta-version/14)
**Author:** [@mvdh](https://systemco2.net/u/mvdh)\ **Replies:** 6\ **Last updated:** [28 September 2026 07:54 UTC](https://systemco2.net/t/pyco2sys-v2-beta-version/14 "2026-09-28T07:54:02Z")
PyCO2SYS v2 beta version To get an update when a new version is released, ‘watch’ this topic! PyCO2SYS v2 is currently still being developed but a beta version is publicly available for you to try out. Please do so and… --- ## [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)
**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")
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 … --- ## [What pH scale is the Perez & Fraga (1987) K\_F on? seacarb and PyCO2SYS disagree, and the coefficients make it puzzling](https://systemco2.net/t/what-ph-scale-is-the-perez-fraga-1987-k-f-on-seacarb-and-pyco2sys-disagree-and-the-coefficients-make-it-puzzling/27)
**Author:** [@orr](https://systemco2.net/u/orr)\ **Replies:** 4\ **Last updated:** [1 August 2026 02:53 UTC](https://systemco2.net/t/what-ph-scale-is-the-perez-fraga-1987-k-f-on-seacarb-and-pyco2sys-disagree-and-the-coefficients-make-it-puzzling/27 "2026-08-01T02:53:26Z")
Subject: What pH scale is the Perez & Fraga (1987) K\_F on? seacarb and PyCO2SYS disagree, and the coefficients make it puzzling Comparing Revelle factors between seacarb and PyCO2SYS, I traced a ~37 ppm difference to th… --- ## [Understanding input and output conditions](https://systemco2.net/t/understanding-input-and-output-conditions/25)
**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")
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. … --- ## [Automatic Cross-Comparison?](https://systemco2.net/t/automatic-cross-comparison/18)
**Author:** [@OscarBranson](https://systemco2.net/u/OscarBranson)\ **Replies:** 9\ **Last updated:** [12 May 2026 07:42 UTC](https://systemco2.net/t/automatic-cross-comparison/18 "2026-05-12T07:42:38Z")
We should set up a repository that automatically cross-compares the outputs of multiple (all?) CO2 calculators whenever they are updated? GitHub actions probably a good platform? For example, this is how we do it for KG… --- ## [Julia Carbonate Calculator](https://systemco2.net/t/julia-carbonate-calculator/19)
**Author:** [@Sophie\_Elam](https://systemco2.net/u/Sophie_Elam)\ **Replies:** 1\ **Last updated:** [14 April 2026 14:49 UTC](https://systemco2.net/t/julia-carbonate-calculator/19 "2026-04-14T14:49:56Z")
Hello! We’ve been doing some work to put together a new carbonate calculator in Julia based off CBsys/CO2sys. Happy to take input! Here’s the link to the repo: GitHub - sophieelam/CarbonateCalculator.jl: Carbonate and b… --- ## [Our long-term goals](https://systemco2.net/t/our-long-term-goals/17)
**Author:** [@mvdh](https://systemco2.net/u/mvdh)\ **Replies:** 1\ **Last updated:** [14 April 2026 13:48 UTC](https://systemco2.net/t/our-long-term-goals/17 "2026-04-14T13:48:01Z")
This is to open start a conversation about longer-term goals that this community could work towards, and how to achieve them. All contributions are warmly welcomed! Some initial ideas to kick things off: Unifying di… --- ## [All the marine carbonate system software](https://systemco2.net/t/all-the-marine-carbonate-system-software/16)
**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")
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 …