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Notebook","category":"Climate Change","sub_category":"Earth and Climate Modeling","monthly_downloads":0,"total_dependent_repos":0,"total_dependent_packages":0,"readme":"# ciceroscm\nPython version of the CICERO-SCM simple climate model/emulator\n\nDescription paper: https://doi.org/10.5194/gmd-17-6589-2024\n\n## Running\nTo run the model, copy \u003ccode\u003erun_full_forcing.py\u003c/code\u003e or \u003ccode\u003erun_scm.py\u003c/code\u003e\nfor a forcing, or full emissions run from the \u003ccode\u003escripts\u003c/code\u003e directory. The forcing run currently\nsupports only files with single total forcing series supplemented\nwith solar and volcanic forcing time series.\nThere is currently no support for pure concentration runs, only full\nemissions.\nThe scripts show you how to specify input data and output data placement.\nThe output data will be placed in a folder called output_test in the\nfolder from which you run the script.\nMore input data on the appropriate format (at least for emission runs) can be found in \u003ccode\u003e/div/amoc/CSCM/SCM_Linux_v2019/RCMIP/input/\u003c/code\u003e on amoc for internal use.\n\n## Instance configurations\nWhen a new instance of the CICERO-SCM class is created the dictionary cfg needs to be sent as a parameter, detailing the configurations of the instance. All options that end in _file can be exchanged with the same parameter ending in _data to send in data directly. See details on the data format in the input_handler module. Configuration options are:\n* nystart - the start year of the run\n* nyend - the end year of the run\n* emstart - the year to start the run with emissions\n* thermal_model - keyword to specify thermal model to use, `default` is original upwelling diffusion model, current version also includes a simple two-layer model which you can invoke with the keyword `twolayer`. If no keyword is sent the default model is used.\n* carbon_cycle - keyword to specify carbon model to use, `default` is original Joos-based model, current version also includes a simple box model which you can invoke with the keyword `box`.  If no keyword is sent the default model is used.\n* idtm - optional parameter to tune the number of subyearly steps in the concentrations_emissions_handler. Default is 24. Should probably not be the first parameter you want to start playing with.\n* sunvolc - an optional parameter to include solar and volcanic forcing. If included and equal to 1 a set of such forcing series will be included.\n* rf_sun_file - optional path to file with solar data, only read if sunvolc is 1. If sunvolc is 1 and this parameter is not set, a default file will be used.\n* rf_volc_file - optional path to file with hemispherically symmetric volcanic forcing data. If you prefer, you can send rf_volc_n_file and rf_volc_s_file for separate data for each hemisphere, but then a global file must not be sent, as it will override the hemispherically split files when present. The volcanic data can be on columns, with monthly data, on one yearly column, or on any other periodic split per column per year (i.e. seasonal, half yearly, every four months). If sunvolc is not 1, all of these will be ignored. If sunvolc is 1 and none and no volcanic forcing data is indicated by the user, a default file will be used.\n* gaspam_file - path to file of gases to include with units, lifetimes, forcing factors etc (mandatory), since the python version, this has been updated to also include a SARF_TO_ERF factor which was previously only hard coded in for methane. The test-data directory has example files for this, one similar to what was used in RCMIP and one with updates from AR6. The gaspam_file or data can also include regionally split aerosols and will then work with similarly split emissions data. Utilities include afunction for generating gaspam_data from a forcing per aerosol and region .txt file. \n* concentrations_file - path to file with concentrations time series (mandatory if not forcing run)\n* emissions_file - path to file with emissions time series (mandatory if not forcing run)\n* nat_ch4_file- optional path to file where natural emissions timeseries for methane can be found. If no file or data is sent, flat values from gaspam_file will be used.\n* nat_n2o_file- optional path to file where natural emissions timeseries for n2o can be found. Default file will be used if not given.  If no file or data is sent, flat values from gaspam_file will be used.\n* forc_file - path to file with forcing time series, if this is sent the run will be a forcing run, and none of the emission and concentration related options will be relevant. The file can be a single column of numbers of total forcing, it will be assumed to run from whatever startyear you set, or a comma separated file, with 'year' as first column, followed by either hemispherically split forcing under headings \"FORC_NH\" and \"FORC_SH\", or columns per various forcing components. (At the moment you cannot include hemispherical split along with several components)\n* conc_run - Set this to True and have a concentration driven run. You will still need to provide an emission file, as some species forcings (such as ozone) are calculated from emissions after emstart.\n* perturb_em_file - path to file with emission perturbations to be added to the emissions from the emissions file, the format for this file is shown in the file in test/test_data/pertem_test.txt\n* perturb_forc_file - path to file with forcings to be added after forcings from emissions and concentrations have been calculated, the format for this file is shown in the file in test/test_data/pertforc_test.txt\n* rs_function - Dictionary to define a custom rs_function. Keys should be \"coeffs\" and \"timescales\" and values should be lists or np.ndarrays\nwith the values for the coefficients and timescales for the rs_function. All values should be positive, and the coefficients should have one\nmore value (constant term) than the timescales. In creating an rs_function from the values, the coefficients will be normalised to give a\ntotal value of 1 when the function is 0. (Only used for default carbon cycle model).\n* rb_function - Dictionary to define a custom rb_function. Keys should be \"coeffs\" and \"timescales\" and values should be lists or np.ndarrays\nwith the values for the coefficients and timescales for the rs_function. All values should be positive, and the coefficients and the timescales should have the same number of values. In creating an rb_function from the values, the coefficients will be normalised first to sum to 1 and then each coefficient is normalised by its corresponding timescale to give an asymptotic integrated value of idtm (number of yearly timesteps). (Only used for default carbon cycle model).\n\n## Options for run\nWith a CICEROSCM instance in place, you are ready to start runs with various parameter configurations, using the input files as set by the instance configuration\n\n### Run configurations\n* output_folder - name of or path of file wher output from the run is stored (at the moment this will always be assumed to be laying under the directory from which the code is run)\n* output_prefix - prefix to output filenames\n* make_plot - if set to True plots of the output are made and saved to a subfolder in the output_folder.\n* results_as_dict - if set to True, outputs will not be printed to files, instead they will be available as a results attribute dictionary to the ciceroscm instance.\n* carbon_cycle_outputs - If set to True, carbon cycle outputs will be included\n\n### Parameter sets\nPhysical parameters to the model is divided in two parametersets each of which are sent as two seperate dictionaries to the run call.\n* One parameterset pamset_udm for the upwelling diffusion model\n* One parameterset pamset_emiconc for emissions and concentrations\nIf the parametersets are not provided, a default parameterset is used\nIf one or more parameters are not provided as part of the parameterset, these parameters will be set to the default values. \nThe default parameter sets should produce fairly sensible temperature histories when fed with AR6 input data, however, there is nothing formally optimal about this particular set of parameters, and a thorough span of the best fit set of parameter combinations will be subject of later work.\n\n#### pamset_udm\n\nThe default upwelling diffusion model (a thermal model is needed for all runs) takes the following parameters.(Default value in paranthesis):\n* rlamdo (15.0) - Air-sea heat exchange parameter \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2\\mathrm{K}}\"\u003e, valid range 5-25\n* akapa (0.66) - Vertical heat diffusivity \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{cm}^2}{\\mathrm{s}}\"\u003e, valid range 0.06-0.8\n* cpi (0.21) - Polar parameter, temperature change ratio polar to nonpolar region, unitless, valid range 0.161-0.569\n* W (2.2) - Vertical velocity, upwelling rate \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{m}}{\\mathrm{yr}}\"\u003e, valid range 0.55-2.55\n* beto (6.9) - Ocean interhemispheric heat exchange coefficient \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2\\mathrm{K}}\"\u003e, valid range 0-7\n* threstemp (7.0) - Scales vertical velocity as a function of mixed layer temperature, unitless. Set to 0 if you don't want to include this parameter.\n* lambda (0.61) - Equilibrium climate sensitivity divided by 2xCO2 radiative forcing \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\left( 3.71 \\frac{\\mathrm{W}}{\\mathrm{m}^2} \\right)\"\u003e\n* mixed (107.) - Mixed layer depth, m, valid range 25-125\n* ocean_efficacy (1.0) - Ocean efficacy parameter, unitless, valid range 0-2\n* foan (0.61) - Fraction of Northern hemisphere covered by ocean\n* foas (0.81) - Fraction of Southern hemisphere covered by ocean\n* ebbeta (0.0) - Atmospheric interhemispheric heat exchange (not currently used)\n* lm (40) - Number of vertical layers (below the mixed layer each layer is at each 100 m depth)\n* ldtime (12) - Number of subyearly timesteps\n\nThe two-layer thermal model which can be used instead takes the following parameters (defaults in paranthesis)\n* lambda (3.74 / 3) - Equilibrium climate sensitivity divided by 2xCO2 radiative forcing.\n* mixed (50) - Mixed layer depth, m, valid range 25-125\n* deep (1200) - Deep ocean layer depth, m.\n* k (0.5) - Coupling constant between layers, W/m^2/K,\n* ocean_efficacy (1.0) - Ocean efficacy parameter, unitless, valid range 0-2\n* foan (0.61) - Fraction of Northern hemisphere covered by ocean\n* foas (0.81) - Fraction of Southern hemisphere covered by ocean\n\n#### pamset_emiconc\nThe concentration and emission parameterset (which is needed for emission runs) takes the following parameters. (Default value in paranthesis):\n\n* qbmb (0.0) - Biomass burning aerosol RF per emissions mass change, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2 Mt BC}\"\u003e\n* qo3 (0.5) - Tropospheric ozone RF in ref_yr, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2}\"\u003e\n* qdirso2 (-0.00308) - Direct sulphate RF per emissions mass change, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2 Mt SO2}\"\u003e (note unit in gaspam-file is the mass unit used)\n* qindso2 (-0.017) - Indirect sulphate RF in ref_yr  per emissions mass change, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2 Mt SO2}\"\u003e (note unit in gaspam-file is the mass unit used)\n* qbc (0.0279) - BC (fossil fuel + biofuel) RF  per emissions mass change, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2 Mt BC}\"\u003e\n* qoc (-0.00433) - OC (fossil fuel + biofuel) RF in  per emissions mass change, \u003cimg src=\"https://render.githubusercontent.com/render/math?math=\\large \\frac{\\mathrm{W}}{\\mathrm{m}^2 Mt OC}\"\u003e\n* qh2o_ch4 (0.091915) - Stratospheric water vapour ERF ratio to methane ERF\n* ref_yr (2010) - Reference year for the above forcing values. To construct radiative forcing time series, these forcing values are scaled using emssions. The forcing in the reference year is equal to the forcing value set by the above parameters\n* idtm (24) - Number of subyearly timesteps for calculation of CO2 concentrations from emissions.\n* lifetime_mode - Lifetime mode for methane, valid options are TAR (for following the third IPCC assessment report), CONSTANT (for a constant value of 12 years) or a wigley exponent behaviour. TAR is the default, but wigley is a hidden default if you send a value for this option which is not TAR nor CONSTANT\n* just_one - this is an optional parameter which allows you to run with the forcing of a single component to the upwelling diffusion model. It should be set equal to the component you are interested in seeing the effects of.\n\n#### pamset_carbon\nThe parameterset for the default carbon cycle (a carbon cycle model is needed for emission runs) takes the following parameters. (Default value in paranthesis):\n* beta_f (0.287) -Fertilisation factor in Joos scheme carbon cycle\n* mixed_carbon (75.0) - Depth of mixed layer in Joos scheme carbon cycle\n* ml_fracmax (0.5), ml_t_half (0.5) and ml_w_sigmoid (3.0) describe temperature feedback for the ocean mixed layer. This is controlled by a sigmoid decrease in mixed layer depth. ml_fracmax gives the maximum fractional loss of mixed layer depth from temperature allowed, ml_t_half is the temperature of the sigmoid half-way point and ml_w_sigmoid is the width of the sigmoid (in K).\n* t_half (0.5), w_sigmoid (7), t_threshold (4), w_threshold (7) describes the temperature feedback on the primary production on land. The temperature dependent land behaviour is controlled by a peak sigmoid inrease and a threshold damping decline, t_half is the temperature of the halfway point of the sigmoid, w_sigmoid is the width of the sigmoid, t_threshold is the point at which the threshold has dampened the effect to half of its maximum and threshold width is the width of the threshold (all in K).\n* solubility_sens (0.02) and solubility_limit (0.5) control temperature feedbacks on the ocean carbon solubility. solubility_sens describes an exponential scaling of solubility with temperature, while solubility_limit limits the amount of gain the scaling can have to (i.e. max scaling of 1 + solubility_limit).\n\nThe alternative box carbon model takes the following parameters (defaults are in paranthesis):\n* beta_f (0.287) -Fertilisation factor in biosphere\n* land_temp_sensitivity (0.1), temperature sensitivity of land uptake\n* soil_respiration_rate (0.02), respiration rate of soil\n* ocean_mixed_layer_depth (25.0) - Ocean mixed layer depth, m, as seen by the carbon cycle \n* ocean_exchange_rate (0.01) - Exchange rate between mixed and deep ocean layer\n* vegetation_to_soil_fraction (0.1) - Fraction of vegetation carbon transferred to soil per year.\n* ocean_solubility_base (0.02) - Base solubility of CO2 in the ocean (PgC/ppm).\n* ocean_solubility_temp_coeff (-0.01) - Temperature sensitivity of ocean CO2 solubility. \n\n## Parallelisation tools\nThe module also has a submodule of parallelisation tools. This includes:\n* The cscmparwrapper, which is a parallelisation wrapper, that you can use for parallel runs of both full runs and forcing specific runs, and parallelise over either multiple scenarios, or multiple configurations or a list of both configurations and scenarios. The wrapper will divide the runs by scenarios initially, but if more parallel workers are available, it will also divide the configuration sets. The scenariodata and the configuration sets both are sents at lists of dictionaries of keyword arguments required for runs\n* ConfigDistro, which is a class for creating configuration distributions. Given a prior in the form of a dictionary, where the keys are parameters to span the parameter space and the values are arrays with two values corresponding to two endpoints of the prior for this parameter, a list of variables not to be changed, but given set values (which may differ from model defaults), final a dictionary of options which can list the method to use (gaussian or latin for gaussion distributions aor latin hypercube, the latter is default) and whether to fit only forcing parameters. The class has functionality to create sample values from the prior distribution space, assuming either gaussian distributions where the prior values span the interval between mean - 1 standard deviation and mean plus 1 standard deviation, or a latin hypercube over the prior extent. It can produce lists of configurations that can be used to run in parallel.\nTheses lists can also be chunked in smaller subsets to ease memory requirements in running over them.\n* DistributionRun, a simple class to wrap running over a distribution from a ConfigDistro, or from reading data from a json file of configurations\n\n## MetaData\nCICERO-SCM supports optional metadata in parameter configuration JSON files. When generating configuration files for parameter distributions, you can add a meta_info dictionary containing model version, settings, or other relevant information. The resulting JSON file will include both the list of configurations and the metadata, making it easier to track origin and context.  There is no enforced schema, and the metadata dictionary can be defined by the user.\n```\n# Define metadata to include\nmeta_info = {\n    \"Model_version\": \"ciceroscm-v1.5.0\",\n    \"carbon_cycle\": \"Default\",\n    \"thermal_model\": \"Default\",\n    \"dump_date\": \"2025-10-10\"\n}\n\n# Write configuration list to JSON with metadata\nconfig.make_config_lists(\n    numvalues=10,\n    json_fname=\"my_config_with_meta.json\",\n    meta_info=meta_info\n) \n```\nBoth legacy (list-only) and new (metadata-inclusive) formats are supported for full backward compatibility.\n\n## Example scripts\nThe scripts folder contains various example scripts that can be used to see how to set up various types of runs. The start of all of them adds the necessary parts for the file to run with the module. If you want to run from somewhere else you will need to edit the \u003ccode\u003esys.path.append\u003c/code\u003e command so it points to where you've stored the src directory of this repository.\n* \u003ccode\u003erun_scm.py\u003c/code\u003e runs a simple emissions run with ssp245 data from 1900 to 2050\n* \u003ccode\u003erun_full_forcing.py\u003c/code\u003e runs a 1 percent CO2 increase forcing with default solar and volcanic forcing from 1750 to 2100\n* \u003ccode\u003erun_perturbations.py\u003c/code\u003e shows runs like that in \u003ccode\u003erun_scm.py\u003c/code\u003e with emissions and forcing perturbations\n* \u003ccode\u003erun_full_emissions_profile.py\u003c/code\u003e runs an ssp245 emissions run from 1750 to 2100 with a profiler, so you can see what parts of the code is more time consuming\n* \u003ccode\u003erun_full_forcing_profile.py\u003c/code\u003e is like \u003ccode\u003erun_full_emissions_profile.py\u003c/code\u003e but for a pure forcing run\n* \u003ccode\u003erun_full_change_all_pams.py\u003c/code\u003e is an emissions ssp245 run from 1750 to 2100 which shows how to set all the parameters for both the upwelling diffusion model and for the concentrations emissions handler.\n* \u003ccode\u003erun_ssps_local.py\u003c/code\u003e runs through all scenarios on on amoc, this script will only work on amoc or qbo, but can show how to loop through elsewhere, just remember to change paths.\n\n## Jupyter Notebooks\nThe notebooks folder provides simple working examples to run the model within a Jupyter environment, and plot example output.  Installation instructions for installing Jupyterlab can be found at https://jupyter.org/install\n\u003ccode\u003eCSCM_example_textinput.ipynb\u003c/code\u003e runs a simple emissions run with ssp245 data from 1900 to 2050, using input data text files stored in the \u003ccode\u003etests/test-data\u003c/code\u003e folder\n\u003ccode\u003eCSCM_example_directinput.ipynb\u003c/code\u003e illustrates an interactive case, where ssp data is read into the environment and passed directly to the model\n\u003ccode\u003eCSCM_example_regional_aerosols.py\u003c/code\u003e is a python-script that can be paired using jupytext to become a notebook for demonstrating regional aerosol functionality.\n\n### prescripts\nInside the scripts folder is a folder called prescripts. It contains scripts that show how to prepare perturbation files for a run and two example datafiles. And includes scripts to prepare natural emissions files.\n\n## Development\n* To start developing make sure you have a github account and that you are part of the ciceroOslo team.\n* If you haven't already, [setup your github account with an ssh key](https://docs.github.com/en/enterprise-server@3.0/authentication/connecting-to-github-with-ssh/adding-a-new-ssh-key-to-your-github-account)\n* Find a suitable place where you want to start your developement either on windows or under /div/nobakcup/users/yourusername/ and change to that directory\n* Once in the preferred directory with a terminal do:\n\u003e \u003ccode\u003egit clone git@github.com:ciceroOslo/ciceroscm.git\u003c/code\u003e\n* To make your own branch (which you really should)\n\u003e \u003ccode\u003egit checkout -b your-cool-branch-name\u003c/code\u003e\n* Whenever you log in or want to check stuff\n\u003e \u003ccode\u003egit status\u003c/code\u003e\n\nIt will tell you the branch you are on, changes since last etc\n* To commit your code changes\n\u003e \u003ccode\u003egit add path-of-file-that-changed\u003c/code\u003e\n\nRepeat this for all the files that you would want to commit the changes for\n\u003e \u003ccode\u003egit commit -m \"A small message to describe the changes\"\u003c/code\u003e\n\n\u003e \u003ccode\u003egit push\u003c/code\u003e\n\n(The last one is to push the changes to the github version. The first time youi do this on a new branch you will need to set where to push to, but how to do that will be suggested when you just do git push)\n* To get new changes that have happened on the main branch is always good before you commit. To do so do:\n\u003e \u003ccode\u003egit checkout main\u003c/code\u003e\n\n\u003e \u003ccode\u003egit pull\u003c/code\u003e\n\n\u003e \u003ccode\u003egit checkout your-cool-branch-name\u003c/code\u003e\n\n\u003e \u003ccode\u003egit merge main\u003c/code\u003e\n\nIf all goes well this will fill your terminal with a merge message in your default editor, which is likely vim. The message there is likely ok as it is, so to just use that as a commit message for the merge type: \u003ccode\u003e:wq\u003c/code\u003e which will just save and quit vim and complete the merge with the original commit message.\n\nThen finally just push your code to the web.\n\n\u003e \u003ccode\u003egit push\u003c/code\u003e\n\nThe last part is just to pushed this new version of your branch again\n\n### Test suite and environment\nThe code comes with a suite of tests and tools. To use this you must do:\n\u003e \u003ccode\u003emake first-venv\u003c/code\u003e\n\n\u003e \u003ccode\u003emake virtual-environment\u003c/code\u003e\n\nThis should only be necessary the first time you setup the code\nYou can load this environment with\n\u003e \u003ccode\u003esource venv/bin/activate\u003c/code\u003e\n\nLater to update you should do:\n\u003e \u003ccode\u003emake virtual-environment\u003c/code\u003e\n\nOr if you know you need updates, but aren't getting them:\n\u003e \u003ccode\u003emake clean\u003c/code\u003e\n\n\u003e \u003ccode\u003emake virtual-environment\u003c/code\u003e\n\nAfter this you should be able to run the automatic tests\n\u003e \u003ccode\u003emake test\u003c/code\u003e\n\nWill only run the tests\n\u003e \u003ccode\u003emake checks\u003c/code\u003e\n\nWill run the tests and formatting tests\n\nBefore your code branch can be merged into the main code, it has to pass all the tests\n(The makefile also has an option to run only the formatting checks)\nTests are located in tests in tests/test-data/ data for testing against fortran runs and test input data are stored. In tests/unit there are unit tests for certain methods. In test/integration there are integration tests of the code, comparing the results to fortran.\nWhen you develop new code, try to think about what can be done to test and validate that your code does what you expect it to do, and try to integrate such tests into the automatic testing scheme.\n\n## General code flow\nThe main code consists of four modules\n* ciceroscm takes in an sorts inputs, is what gets called, and loops over the years and calls the other methods. It also outputs temperature and ocean data.\n* upwelling_diffusion_method is the energy budgeting method that takes forcing to temperature, ocean heat content etc. It gets called and delivers results to ciceroscm.\n* concentration_emissions_handler takes care of calculating its way from emissions to concentrations to forcing. It gets called every year, but saves it's results internally and only returns the forcing. It also has an output method of it's own to produce the emission, concentration and forcing files from the run\n* _utils is just a method to put common utilities in. At the moment it has only one method that can check whehter a parameterset includes the expected values and putting in default values if not.\n* perturbations.py handles and adds perturbations to either forcing or emissions per species.\n* make_plots makes plots if plotting functionality is invoked.\n* input_handler takes care of reading in files or data, and has various file reading methods.\n\n","funding_links":[],"readme_doi_urls":["https://doi.org/10.5194/gmd-17-6589-2024"],"works":{},"citation_counts":{},"total_citations":0,"keywords_from_contributors":[],"project_url":"https://ost.ecosyste.ms/api/v1/projects/185775","html_url":"https://ost.ecosyste.ms/projects/185775"}