Nitrogen leaching-attenuation and indirect-N2O constants.
Source:R/datasets_balances.R
n_attenuation_constants.RdScalar constants for the nitrogen-loss cascade: the input C:N leaching
attenuation parameters (a_cn_*) and the IPCC indirect-emission
factors. The C:N attenuation reduces nitrate leaching for
carbon-rich, low-availability inputs; the indirect factors convert
volatilised ammonia and leached nitrate into indirect N2O and set the
ammonia-volatilisation fractions.
Format
A tibble with columns:
- constant
Constant name:
"a_cn_min_cn","a_cn_span","a_cn_span_other","a_cn_max","ef5_no3_to_n2o","ef4_nh3_to_n2o_atl","nh3_frac_synthetic","nh3_frac_organic".- value
Numeric value of the constant.
- description
Human-readable description of the constant.
Source
C:N attenuation parameters from the Spain historical nitrogen
pipeline (n_fun.r). Indirect emission factors and ammonia
volatilisation fractions: IPCC (2019), 2019 Refinement to the 2006
IPCC Guidelines for National Greenhouse Gas Inventories, Vol. 4,
Chapter 11 (EF5 = 0.011 for nitrate leaching to N2O; EF4 = 0.016 for
Atlantic ammonia to N2O; NH3 volatilisation fractions 0.11 synthetic
and 0.21 organic, Table 11.3).
Examples
n_attenuation_constants
#> # A tibble: 8 × 3
#> constant value description
#> <chr> <dbl> <chr>
#> 1 a_cn_min_cn 15 Input C:N below which the C:N leaching attenuation…
#> 2 a_cn_span 120 C:N span above the minimum needed to reach the A_C…
#> 3 a_cn_span_other 60 Steeper C:N span for the Other land-use class (roc…
#> 4 a_cn_max 0.98 Maximum C:N leaching attenuation (forest woody-lit…
#> 5 ef5_no3_to_n2o 0.011 IPCC EF5: fraction of leached NO3-N emitted as ind…
#> 6 ef4_nh3_to_n2o_atl 0.016 Atlantic (wet) NH3-N to indirect N2O-N factor (IPC…
#> 7 nh3_frac_synthetic 0.11 IPCC 2019 Table 11.3 NH3-N volatilisation fraction…
#> 8 nh3_frac_organic 0.21 IPCC 2019 Table 11.3 NH3-N volatilisation fraction…