39 lines
1.6 KiB
ReStructuredText
39 lines
1.6 KiB
ReStructuredText
.. _running-with-tillage:
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.. include:: ../substitutions.rst
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=====================
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Running with tillage
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=====================
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Cropland tillage (Sect. :numref:`decomp_mgmt_modifiers`) is set to ``'low'`` by default. This can be changed to a value of ``'off'`` (no tillage) or ``'high'`` (high-intensity tillage) for the ``tillage_mode`` namelist option.
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Depth of tillage can be changed with the ``max_tillage_depth`` parameter (meters; default 0.26).
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Tillage multipliers for different soil pools and time since planting are defined on the parameter file, in variables ``bgc_till_decompk_multipliers`` (for CENTURY soil) and ``mimics_till_decompk_multipliers`` (for MIMICS soil). These variables were originally added with the script at ``tools/contrib/add_tillage_to_paramsfile.py``, which can be modified as needed to change tillage multipliers.
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Example: Crop simulation with no tillage
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----------------------------------------
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::
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> cime/scripts/create_newcase -case IHistClm51BgcCrop_notill -res f19_g17_gl4 -compset IHistClm51BgcCrop
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> cd IHistClm51BgcCrop_notill
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> ./case.setup
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# turn off tillage
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> echo "tillage_mode = 'off'" >> user_nl_clm
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Reverting fixes relative to original tillage implementation
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-----------------------------------------------------------
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The current implementation of tillage in CTSM is based on work by :ref:`Graham et al. (2021) <Grahametal2021>`, but with fixes to how days after planting is calculated and to default tillage depth. To run without those changes:
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::
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> echo "use_original_tillage_phases = .true." >> user_nl_clm
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> echo "max_tillage_depth = 0.32" >> user_nl_clm
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