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Compute the AMG (AMGv2) annual climate rate modifier.

Source: R/soc_climate.R
soc_rate_modifier_amg.Rd

Annual AMGv2 climate rate-modifying factor: the logistic temperature function f(T) normalized to 1 at the 15 degree reference and the logistic moisture function f(H) of the annual water balance, multiplied and averaged over the supplied series.

Usage

soc_rate_modifier_amg(temp_c, water_balance_mm)

Source

Clivot, H., Mouny, J.-C., Duparque, A., Dinh, J.-L., Denoroy, P., ... Mary, B. (2019). Modeling soil organic carbon evolution in long-term arable experiments with AMG model. doi:10.1016/j.envsoft.2019.04.004 ; temperature form from Saffih-Hdadi, K. & Mary, B. (2008). doi:10.1016/j.soilbio.2007.08.022 .

Arguments

temp_c

Numeric mean annual air temperature series (degrees Celsius).

water_balance_mm

Numeric annual water balance series (precipitation plus irrigation minus potential evapotranspiration, mm).

Value

The annual mean of the f(T) * f(H) product (a single numeric).

Examples

soc_rate_modifier_amg(
  temp_c = c(8, 15, 22),
  water_balance_mm = c(-100, 0, 200)
)
#> [1] 1.189645