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Calculate manure emissions (CH4 + N2O).

Source: R/livestock_emissions.R
calculate_manure_emissions.Rd

Wrapper that selects Tier 1 or 2 for manure CH4 and computes N2O (Tier 2 only; skipped for Tier 1).

Usage

calculate_manure_emissions(data, tier = NULL)

Arguments

data

Dataframe with species, heads. For Tier 2, also needs cohort, weight, and diet_quality. For Tier 1, iso3 is used to select regional emission factors.

tier

Integer 1 or 2. If NULL (default), auto-selects based on data completeness.

Value

Dataframe with all input columns preserved, plus:

  • method_manure_ch4: tracking label.

  • Tier 1: manure_ef_kgch4, manure_ch4_tier1.

  • Tier 2: volatile_solids, methane_potential, weighted_mcf, manure_ch4_per_head, manure_ch4_tier2.

  • N2O (both tiers): method_manure_n2o, n_excretion, manure_n2o_direct, manure_n2o_indirect, manure_n2o_total. Tier 1 uses default per-head excretion rates; Tier 2 uses the energy/nitrogen balance.

Examples

tibble::tibble(
  species = "Cattle", heads = 1000, iso3 = "DEU"
) |>
  calculate_manure_emissions(tier = 1)
#> # A tibble: 1 × 14
#>   species heads iso3  species_gen method_manure_ch4 manure_ef_kgch4
#>   <chr>   <dbl> <chr> <chr>       <chr>                       <dbl>
#> 1 Cattle   1000 DEU   Cattle      IPCC_2019_Tier1                 1
#> # ℹ 8 more variables: manure_ch4_tier1 <dbl>, method_manure_n2o <chr>,
#> #   manure_category <chr>, region <chr>, n_excretion <dbl>,
#> #   manure_n2o_direct <dbl>, manure_n2o_indirect <dbl>, manure_n2o_total <dbl>