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wwieder / biogeochem_testbed

Soil biogeochemical testbed
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microbial turnover w/ CN model? #40

Open wwieder opened 4 years ago

wwieder commented 4 years ago

I'm not sure why, but the CN model has much lower microbial biomass turnover rates, which leads to larger MIC pools and smaller SOM stocks, compared to the C-only version of the model, even when using the same parameter file.

Below are to plots of MICr pool sizes for the CN and C-only model (left and right respectively).
image

Case directories are:

/project/tss/wwieder/biogeochem_testbed_1.1/GRID_CN/MIMICS_mod3_borealNfix_GSWP3

&

/project/tss/wwieder/biogeochem_testbed_1.1/GRID_CN/MIMICS_GSWP3_Conly

wwieder commented 4 years ago

I'm assuming this feature is being caused by this line, which adds the density dependent exponent term (currently set to 2) to the calculation of microbial turnover: https://github.com/wwieder/biogeochem_testbed_1.1/blob/2576a2cc5a6bdee9c5bc8830079f8e28343af9ba/SOURCE_CODE/mimics_cycle_CN.f90#L1666

@emilykykersnowman, maybe this is worth discussing if we keep this in?