R/zchunk_L123.bcoc_awb_R_S_T_Y.R

In rohmin9122/gcam-korea-release: Build the GCAM-Korea Input Datasets

#' module_emissions_L123.bcoc_awb_R_S_T_Y
#'
#' Produces BC and OC AWB emission factors for each Ag production technology.
#'
#' @param command API command to execute
#' @param ... other optional parameters, depending on command
#' @return Depends on \code{command}: either a vector of required inputs,
#' a vector of output names, or (if \code{command} is "MAKE") all
#' the generated outputs: \code{L123.bcoc_tgmt_R_awb_2000}. The corresponding file in the
#' original data system was \code{L123.bcoc_awb_R_S_T_Y.R} (emissions level1).
#' @details Use RCP year 2000 BC and OC emissions from agricultural waste burning on fields (AWB) to calculate emission factors for each ag production technology. Allocates regional AWB emissions to GCAM technology according to above-ground non-harvested biomass.
#' @importFrom assertthat assert_that
#' @importFrom dplyr filter mutate select
#' @importFrom tidyr gather spread
#' @author SJS May 2017
module_emissions_L123.bcoc_awb_R_S_T_Y <- function(command, ...) {
  if(command == driver.DECLARE_INPUTS) {
    return(c(FILE = "common/iso_GCAM_regID",
             "L101.ag_Prod_Mt_R_C_Y_GLU",
             "L121.AWBshare_R_C_Y_GLU",
             FILE = "emissions/RCP_BC_2000",
             FILE = "emissions/RCP_OC_2000"))
  } else if(command == driver.DECLARE_OUTPUTS) {
    return(c("L123.bcoc_tgmt_R_awb_2000"))
  } else if(command == driver.MAKE) {

    year <- iso <- awb <- Non.CO2 <- GCAM_region_ID <- AWB_emiss_share <-
        awb_emission <- value <- . <- NULL # silence package check.

    all_data <- list(...)[[1]]

    # Load required inputs
    iso_GCAM_regID <- get_data(all_data, "common/iso_GCAM_regID")
    L101.ag_Prod_Mt_R_C_Y_GLU <- get_data(all_data, "L101.ag_Prod_Mt_R_C_Y_GLU")
    L121.AWBshare_R_C_Y_GLU <- get_data(all_data, "L121.AWBshare_R_C_Y_GLU")
    RCP_BC_2000 <- get_data(all_data, "emissions/RCP_BC_2000")
    RCP_OC_2000 <- get_data(all_data, "emissions/RCP_OC_2000")

    # Extract 2000 emissions data for AWB emissions and assign emission species identifier
    RCP_BC_2000 %>%
      select(iso, awb) %>%
      mutate(Non.CO2 = "BC_AWB") -> BC_AWB_2000

    RCP_OC_2000 %>%
      select(iso, awb) %>%
      mutate(Non.CO2 = "OC_AWB") -> OC_AWB_2000

    # Aggregate BC and OC emissions to GCAM regions and convert to Tg
    bind_rows(OC_AWB_2000, BC_AWB_2000) %>%
      # Not all iso's will necesarilly have an input value. This is ok, but use left_join becuase of this.
      left_join(iso_GCAM_regID, by = "iso") %>%
      group_by(Non.CO2, GCAM_region_ID) %>%
      summarize_if(is.numeric , sum) %>%
      filter(!is.na(awb)) %>%
      mutate(awb = awb * CONV_KG_TO_TG) %>%
      ungroup() ->
      BCOC_AWB_2000

    # Extract only 2000 data from ag production data
    filter(L101.ag_Prod_Mt_R_C_Y_GLU, year == 2000) %>%
      select(-year)  ->
      L101.ag_Prod_Mt_R_C_Y_GLU_2000

    # Allocate aggreate regional year 2000 AWB emissions into GCAM crop and GLU
    # This is done using shares from L121.AWBshare_R_C_Y_GLU, which is calculated in another chunk
    filter(L121.AWBshare_R_C_Y_GLU, year == "2000") %>%
      select(-year) %>%
      # Add BC and OC emissions data
      repeat_add_columns(tibble::tibble(Non.CO2 = c("BC_AWB", "OC_AWB"))) %>%
      left_join_error_no_match(BCOC_AWB_2000, by = c("GCAM_region_ID", "Non.CO2")) %>%
      # Calculate AWB emissions by crop and GLU by sharing out regional total awb emissions
      # by the share for each individual GCAM technology
      mutate(awb_emission = AWB_emiss_share * awb) %>%
      # Add production data
      left_join_error_no_match(L101.ag_Prod_Mt_R_C_Y_GLU_2000, by = c("GCAM_region_ID", "GCAM_commodity", "GLU")) %>%
      # Calculate emission factor, which is
      mutate(emfact = awb_emission / value) %>%
      select(-awb_emission, -value, -AWB_emiss_share, -awb) %>%
      # Replace NaNs with zeros
      mutate_all(funs(replace(., is.na(.), 0))) ->
      L121.AWB_Emissions_FactorR_C_Y_GLU

    # Produce outputs
    L121.AWB_Emissions_FactorR_C_Y_GLU %>%
      add_title("Emission factors for BC and OC emissions by GCAM GLU and crop") %>%
      add_units("kt/Mt") %>%
      add_comments("Derived from RCP year 2000 AWB emissions by region and allocated according to above ground non-harvested biomass") %>%
      add_legacy_name("L123.bcoc_tgmt_R_awb_2000") %>%
      add_precursors("common/iso_GCAM_regID",
                     "emissions/RCP_BC_2000",
                     "emissions/RCP_OC_2000",
                     "L101.ag_Prod_Mt_R_C_Y_GLU",
                     "L121.AWBshare_R_C_Y_GLU") ->
      L123.bcoc_tgmt_R_awb_2000

    return_data(L123.bcoc_tgmt_R_awb_2000)
  } else {
    stop("Unknown command")
  }
}