Feature/pcolarco/carbon chem loss upd #266
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…sion to resource file; add hooks for ad hoc chemical loss mechanism per tracer; update emissions under AMIP (only)
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Label error. Requires at least 1 of: 0 diff, 0 diff trivial, Non 0-diff, 0 diff structural, 0-diff trivial, Not 0-diff, 0-diff, automatic, 0-diff uncoupled. Found: enhancement |
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Label error. Requires at least 1 of: 0 diff, 0 diff trivial, Non 0-diff, 0 diff structural, 0-diff trivial, Not 0-diff, 0-diff, automatic, 0-diff uncoupled. Found: enhancement |
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This feature implements two changes:
It changes the formulation of the hydrophobic to hydrophilic conversion for carbon species, now defined by a time scale specified in the instance RC file. This is now specified by providing an e-folding time in days. This moves the time constant from outside the fortran to the run-time configurable RC file. This is not quite zero-diff with original code because of the precision of the specification, but testing shows nearly zero-diff result.
Also now present in the carbon instance RC files is a run-time configurable optional parameterized loss rate (e-folding time in days) per species and per mode. Default value for all is set to "-1" which means no use of this function. It has been tested separately for hydrophilic brown carbon (-1 6.0) which favorably improves OA:BC ratio for southern African biomass burning. This requires additional rescaling of BB emissions (increase scaling from 0.778->0.9 for BC and 0.778->1.25 for BR) to compensate for increased loss (in second case) and to improve simulation of BC (in first case). This requires further testing before recommending configuration changes, but as defined in default it is zero-diff.