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The Hector Simple Climate Model

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As noted in https://github.com/JGCRI/hector/pull/722#issuecomment-1880047469 - >When the climate cools, new permafrost can form; the carbon for this is preferentially pulled from the thawed permafrost pool, but if that runs out,...

bug

https://www.nature.com/articles/s41558-023-01803-4 via @cahartin - thank you!

For CMIP6 models, "The sensitivity to CO2 is shown to dominate soil carbon changes at least up to a doubling of atmospheric CO2." From https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2666/#discussion

It looks like additional functions (GMST and GSAT) did not make their way into the `hector::fxntable`, similar to what we want to do with input/params table (see #657) we should...

enhancement
documentation

CH4 emissions oxidize to CO2 in the atmosphere. For the fraction of CH4 emissions that are from biogenic sources (rice, landfills, etc.) it is generally assumed that this results in...

@kdorheim Ben and I were talking about the process of getting Rtools working for Windows to build Hector. Would it be helpful/useful to have Hector vignette for the installation process?

This was brought up by @d3y419 during the Hector V3 & GCAM core model proposal that daccs uptake would more appropriately be named cdr. Due to the code-breaking changes this...

The R unit testing is pretty powerful but it does not check the values that are returned at the current state (if no date is provided, it assumes to return...

enhancement

Looking at the [carbon tracking vignette](http://jgcri.github.io/hector/articles/ex_carbon_tracking.html) there is some unexpected behavior in the first figure, without the permafrost module activated wouldn't we expect the permafrost carbon pool to be 0?...

help wanted
documentation

From https://github.com/JGCRI/hector/issues/692#issuecomment-1416869721 >Even simpler would be to rip out Rcpp usage entirely in this file, and just depend on `std::filesystem`! I couldn't quite get this to work — see #694...