met_subgrid.c

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/*
  This file is part of MPTRAC.
  
  MPTRAC is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  MPTRAC is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with MPTRAC. If not, see <http://www.gnu.org/licenses/>.
  
  Copyright (C) 2013-2026 Forschungszentrum Juelich GmbH
*/
 
#include "mptrac.h"
 
/* ------------------------------------------------------------
   Functions...
   ------------------------------------------------------------ */
 
void usage(
  void);
 
/* ------------------------------------------------------------
   Main...
   ------------------------------------------------------------ */
 
int main(
  int argc,
  char *argv[]) {
 
  ctl_t ctl;
 
  clim_t *clim;
 
  met_t *met0, *met1;
 
  dd_t *dd;
 
  FILE *out;
 
  static double usig[EP][EY], vsig[EP][EY], wsig[EP][EY];
 
  static float u[16], v[16], w[16];
 
  static int n[EP][EY];
 
  /* Allocate... */
  ALLOC(clim, clim_t, 1);
  ALLOC(met0, met_t, 1);
  ALLOC(met1, met_t, 1);
  ALLOC(dd, dd_t, 1);
 
  /* Print usage information... */
  USAGE;
 
  /* Check arguments... */
  if (argc < 4 && argc % 2 != 0)
    ERRMSG("Missing or invalid command-line arguments.\n\n"
           "Usage: met_subgrid <ctl> <subgrid.tab> <met0> <met1> [<met0b> <met1b> ...]\n\n"
           "Use -h for full help.");
 
  /* Read control parameters... */
  mptrac_read_ctl(argv[1], argc, argv, &ctl);
 
  /* Read climatological data... */
  mptrac_read_clim(&ctl, clim);
 
  /* Loop over data files... */
  for (int i = 3; i < argc - 1; i += 2) {
 
    /* Read meteorological data... */
    if (!mptrac_read_met(argv[i], &ctl, clim, met0, dd))
      ERRMSG("Cannot open file!");
    if (!mptrac_read_met(argv[i + 1], &ctl, clim, met1, dd))
      ERRMSG("Cannot open file!");
 
    /* Loop over grid boxes... */
    for (int ix = 0; ix < met0->nx - 1; ix++)
      for (int iy = 0; iy < met0->ny - 1; iy++)
        for (int iz = 0; iz < met0->np - 1; iz++) {
 
          /* Collect local wind data... */
          u[0] = met0->u[ix][iy][iz];
          u[1] = met0->u[ix + 1][iy][iz];
          u[2] = met0->u[ix][iy + 1][iz];
          u[3] = met0->u[ix + 1][iy + 1][iz];
          u[4] = met0->u[ix][iy][iz + 1];
          u[5] = met0->u[ix + 1][iy][iz + 1];
          u[6] = met0->u[ix][iy + 1][iz + 1];
          u[7] = met0->u[ix + 1][iy + 1][iz + 1];
 
          v[0] = met0->v[ix][iy][iz];
          v[1] = met0->v[ix + 1][iy][iz];
          v[2] = met0->v[ix][iy + 1][iz];
          v[3] = met0->v[ix + 1][iy + 1][iz];
          v[4] = met0->v[ix][iy][iz + 1];
          v[5] = met0->v[ix + 1][iy][iz + 1];
          v[6] = met0->v[ix][iy + 1][iz + 1];
          v[7] = met0->v[ix + 1][iy + 1][iz + 1];
 
          w[0] = (float) (1e3 * DP2DZ(met0->w[ix][iy][iz], met0->p[iz]));
          w[1] = (float) (1e3 * DP2DZ(met0->w[ix + 1][iy][iz], met0->p[iz]));
          w[2] = (float) (1e3 * DP2DZ(met0->w[ix][iy + 1][iz], met0->p[iz]));
          w[3] =
            (float) (1e3 * DP2DZ(met0->w[ix + 1][iy + 1][iz], met0->p[iz]));
          w[4] =
            (float) (1e3 * DP2DZ(met0->w[ix][iy][iz + 1], met0->p[iz + 1]));
          w[5] =
            (float) (1e3 *
                     DP2DZ(met0->w[ix + 1][iy][iz + 1], met0->p[iz + 1]));
          w[6] =
            (float) (1e3 *
                     DP2DZ(met0->w[ix][iy + 1][iz + 1], met0->p[iz + 1]));
          w[7] =
            (float) (1e3 *
                     DP2DZ(met0->w[ix + 1][iy + 1][iz + 1], met0->p[iz + 1]));
 
          /* Collect local wind data... */
          u[8] = met1->u[ix][iy][iz];
          u[9] = met1->u[ix + 1][iy][iz];
          u[10] = met1->u[ix][iy + 1][iz];
          u[11] = met1->u[ix + 1][iy + 1][iz];
          u[12] = met1->u[ix][iy][iz + 1];
          u[13] = met1->u[ix + 1][iy][iz + 1];
          u[14] = met1->u[ix][iy + 1][iz + 1];
          u[15] = met1->u[ix + 1][iy + 1][iz + 1];
 
          v[8] = met1->v[ix][iy][iz];
          v[9] = met1->v[ix + 1][iy][iz];
          v[10] = met1->v[ix][iy + 1][iz];
          v[11] = met1->v[ix + 1][iy + 1][iz];
          v[12] = met1->v[ix][iy][iz + 1];
          v[13] = met1->v[ix + 1][iy][iz + 1];
          v[14] = met1->v[ix][iy + 1][iz + 1];
          v[15] = met1->v[ix + 1][iy + 1][iz + 1];
 
          w[8] = (float) (1e3 * DP2DZ(met1->w[ix][iy][iz], met1->p[iz]));
          w[9] = (float) (1e3 * DP2DZ(met1->w[ix + 1][iy][iz], met1->p[iz]));
          w[10] = (float) (1e3 * DP2DZ(met1->w[ix][iy + 1][iz], met1->p[iz]));
          w[11] =
            (float) (1e3 * DP2DZ(met1->w[ix + 1][iy + 1][iz], met1->p[iz]));
          w[12] =
            (float) (1e3 * DP2DZ(met1->w[ix][iy][iz + 1], met1->p[iz + 1]));
          w[13] =
            (float) (1e3 *
                     DP2DZ(met1->w[ix + 1][iy][iz + 1], met1->p[iz + 1]));
          w[14] =
            (float) (1e3 *
                     DP2DZ(met1->w[ix][iy + 1][iz + 1], met1->p[iz + 1]));
          w[15] =
            (float) (1e3 *
                     DP2DZ(met1->w[ix + 1][iy + 1][iz + 1], met1->p[iz + 1]));
 
          /* Get standard deviations of local wind data... */
          usig[iz][iy] += stddev(u, 16);
          vsig[iz][iy] += stddev(v, 16);
          wsig[iz][iy] += stddev(w, 16);
          n[iz][iy]++;
 
          /* Check surface pressure... */
          if (met0->p[iz] > met0->ps[ix][iy]
              || met1->p[iz] > met1->ps[ix][iy]) {
            usig[iz][iy] = NAN;
            vsig[iz][iy] = NAN;
            wsig[iz][iy] = NAN;
            n[iz][iy] = 0;
          }
        }
  }
 
  /* Create output file... */
  LOG(1, "Write subgrid data file: %s", argv[2]);
  if (!(out = fopen(argv[2], "w")))
    ERRMSG("Cannot create file!");
 
  /* Write header... */
  fprintf(out,
          "# $1 = time [s]\n"
          "# $2 = altitude [km]\n"
          "# $3 = longitude [deg]\n"
          "# $4 = latitude [deg]\n"
          "# $5 = zonal wind standard deviation [m/s]\n"
          "# $6 = meridional wind standard deviation [m/s]\n"
          "# $7 = vertical velocity standard deviation [m/s]\n"
          "# $8 = number of data points\n");
 
  /* Write output... */
  for (int iy = 0; iy < met0->ny - 1; iy++) {
    fprintf(out, "\n");
    for (int iz = 0; iz < met0->np - 1; iz++)
      fprintf(out, "%.2f %g %g %g %g %g %g %d\n",
              0.5 * (met0->time + met1->time),
              0.5 * (Z(met0->p[iz]) + Z(met1->p[iz + 1])),
              0.0, 0.5 * (met0->lat[iy] + met1->lat[iy + 1]),
              usig[iz][iy] / n[iz][iy], vsig[iz][iy] / n[iz][iy],
              wsig[iz][iy] / n[iz][iy], n[iz][iy]);
  }
 
  /* Close file... */
  fclose(out);
 
  /* Free... */
  free(clim);
  free(met0);
  free(met1);
  free(dd);
 
  return EXIT_SUCCESS;
}
 
/*****************************************************************************/
 
void usage(
  void) {
 
  printf("\nMPTRAC met_subgrid tool.\n\n");
  printf
    ("Calculate subgrid-scale wind and vertical velocity standard deviations.\n");
  printf("\n");
  printf("Usage:\n");
  printf
    ("  met_subgrid <ctl> <subgrid.tab> <met0> <met1> [<met0b> <met1b> ...]\n");
  printf("\n");
  printf("Arguments:\n");
  printf("  <ctl>          Control file.\n");
  printf("  <subgrid.tab>  Output table.\n");
  printf("  <met*>         Meteorological input file pairs.\n");
  printf("\nFurther information:\n");
  printf("  Manual: https://slcs-jsc.github.io/mptrac/\n");
}