met_lapse.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"
 
/* ------------------------------------------------------------
   Dimensions...
   ------------------------------------------------------------ */
 
#define LAPSEMIN -20.0
 
#define DLAPSE 0.1
 
#define IDXMAX 400
 
/* ------------------------------------------------------------
   Functions...
   ------------------------------------------------------------ */
 
void usage(
  void);
 
/* ------------------------------------------------------------
   Main...
   ------------------------------------------------------------ */
 
int main(
  int argc,
  char *argv[]) {
 
  ctl_t ctl;
 
  clim_t *clim;
 
  met_t *met;
 
  dd_t *dd;
 
  FILE *out;
 
  static double p2[1000], t[1000], t2[1000], z[1000], z2[1000], lat_mean,
    z_mean;
 
  static int hist_max[1000], hist_min[1000], hist_mean[1000], hist_sig[1000],
    nhist_max, nhist_min, nhist_mean, nhist_sig, np;
 
  /* Allocate... */
  mptrac_alloc(NULL, NULL, &clim, &met, NULL, NULL, NULL, &dd);
 
  /* Print usage information... */
  USAGE;
 
  /* Check arguments... */
  if (argc < 4)
    ERRMSG("Missing or invalid command-line arguments.\n\n"
           "Usage: met_lapse <ctl> <lapse.tab> <met0> [<met1> ...]\n\n"
           "Use -h for full help.");
 
  /* Read control parameters... */
  mptrac_read_ctl(argv[1], argc, argv, &ctl);
  const int dz =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_DZ", -1, "20", NULL);
  const double lat0 =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_LAT0", -1, "-90", NULL);
  const double lat1 =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_LAT1", -1, "90", NULL);
  const double z0 =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_Z0", -1, "0", NULL);
  const double z1 =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_Z1", -1, "100", NULL);
  const int intpol =
    (int) scan_ctl(argv[1], argc, argv, "LAPSE_INTPOL", -1, "1", NULL);
 
  /* Read climatological data... */
  mptrac_read_clim(&ctl, clim);
 
  /* Loop over files... */
  for (int i = 3; i < argc; i++) {
 
    /* Read meteorological data... */
    if (!mptrac_read_met(argv[i], &ctl, clim, met, dd))
      continue;
 
    /* Get altitude and pressure profiles... */
    for (int iz = 0; iz < met->np; iz++)
      z[iz] = Z(met->p[iz]);
    for (int iz = 0; iz <= 250; iz++) {
      z2[iz] = 0.0 + 0.1 * iz;
      p2[iz] = P(z2[iz]);
    }
 
    /* Loop over grid points... */
    for (int ix = 0; ix < met->nx; ix++)
      for (int iy = 0; iy < met->ny; iy++) {
 
        /* Check latitude range... */
        if (met->lat[iy] < lat0 || met->lat[iy] > lat1)
          continue;
 
        /* Interpolate temperature profile... */
        for (int iz = 0; iz < met->np; iz++)
          t[iz] = met->t[ix][iy][iz];
        if (intpol == 1)
          spline(z, t, met->np, z2, t2, 251, ctl.met_tropo_spline);
        else
          for (int iz = 0; iz <= 250; iz++) {
            int idx = locate_irr(z, met->np, z2[iz]);
            t2[iz] = LIN(z[idx], t[idx], z[idx + 1], t[idx + 1], z2[iz]);
          }
 
        /* Loop over vertical levels... */
        for (int iz = 0; iz <= 250; iz++) {
 
          /* Check height range... */
          if (z2[iz] < z0 || z2[iz] > z1)
            continue;
 
          /* Check surface pressure... */
          if (p2[iz] > met->ps[ix][iy])
            continue;
 
          /* Get mean latitude and height... */
          lat_mean += met->lat[iy];
          z_mean += z2[iz];
          np++;
 
          /* Get lapse rates within a vertical layer... */
          int nlapse = 0;
          double lapse_max = -1e99, lapse_min = 1e99, lapse_mean =
            0, lapse_sig = 0;
          for (int iz2 = iz + 1; iz2 <= iz + dz; iz2++) {
            lapse_max =
              MAX(LAPSE(p2[iz], t2[iz], p2[iz2], t2[iz2]), lapse_max);
            lapse_min =
              MIN(LAPSE(p2[iz], t2[iz], p2[iz2], t2[iz2]), lapse_min);
            lapse_mean += LAPSE(p2[iz], t2[iz], p2[iz2], t2[iz2]);
            lapse_sig += SQR(LAPSE(p2[iz], t2[iz], p2[iz2], t2[iz2]));
            nlapse++;
          }
          lapse_mean /= nlapse;
          lapse_sig = sqrt(MAX(lapse_sig / nlapse - SQR(lapse_mean), 0));
 
          /* Get histograms... */
          int idx = (int) ((lapse_max - LAPSEMIN) / DLAPSE);
          if (idx >= 0 && idx < IDXMAX) {
            hist_max[idx]++;
            nhist_max++;
          }
 
          idx = (int) ((lapse_min - LAPSEMIN) / DLAPSE);
          if (idx >= 0 && idx < IDXMAX) {
            hist_min[idx]++;
            nhist_min++;
          }
 
          idx = (int) ((lapse_mean - LAPSEMIN) / DLAPSE);
          if (idx >= 0 && idx < IDXMAX) {
            hist_mean[idx]++;
            nhist_mean++;
          }
 
          idx = (int) ((lapse_sig - LAPSEMIN) / DLAPSE);
          if (idx >= 0 && idx < IDXMAX) {
            hist_sig[idx]++;
            nhist_sig++;
          }
        }
      }
  }
 
  /* Create output file... */
  LOG(1, "Write lapse rate data: %s", argv[2]);
  if (!(out = fopen(argv[2], "w")))
    ERRMSG("Cannot create file!");
 
  /* Write header... */
  fprintf(out,
          "# $1 = mean altitude [km]\n"
          "# $2 = mean latitude [deg]\n"
          "# $3 = lapse rate [K/km]\n"
          "# $4 = counts of maxima per bin\n"
          "# $5 = total number of maxima\n"
          "# $6 = normalized frequency of maxima\n"
          "# $7 = counts of minima per bin\n"
          "# $8 = total number of minima\n"
          "# $9 = normalized frequency of minima\n"
          "# $10 = counts of means per bin\n"
          "# $11 = total number of means\n"
          "# $12 = normalized frequency of means\n"
          "# $13 = counts of sigmas per bin\n"
          "# $14 = total number of sigmas\n"
          "# $15 = normalized frequency of sigmas\n\n");
 
  /* Write data... */
  double nmax_max = 0, nmax_min = 0, nmax_mean = 0, nmax_sig = 0;
  for (int idx = 0; idx < IDXMAX; idx++) {
    nmax_max = MAX(hist_max[idx], nmax_max);
    nmax_min = MAX(hist_min[idx], nmax_min);
    nmax_mean = MAX(hist_mean[idx], nmax_mean);
    nmax_sig = MAX(hist_sig[idx], nmax_sig);
  }
  for (int idx = 0; idx < IDXMAX; idx++)
    fprintf(out,
            "%g %g %g %d %d %g %d %d %g %d %d %g %d %d %g\n",
            z_mean / np, lat_mean / np, (idx + .5) * DLAPSE + LAPSEMIN,
            hist_max[idx], nhist_max,
            (double) hist_max[idx] / (double) nmax_max, hist_min[idx],
            nhist_min, (double) hist_min[idx] / (double) nmax_min,
            hist_mean[idx], nhist_mean,
            (double) hist_mean[idx] / (double) nmax_mean, hist_sig[idx],
            nhist_sig, (double) hist_sig[idx] / (double) nmax_sig);
 
  /* Close file... */
  fclose(out);
 
  /* Free... */
  mptrac_free(NULL, NULL, clim, met, NULL, NULL, NULL, dd);
 
  return EXIT_SUCCESS;
}
 
/*****************************************************************************/
 
void usage(
  void) {
 
  printf("\nMPTRAC met_lapse tool.\n\n");
  printf("Calculate lapse-rate statistics from meteorological data.\n");
  printf("\n");
  printf("Usage:\n");
  printf("  met_lapse <ctl> <lapse.tab> <met0> [<met1> ...]\n");
  printf("\n");
  printf("Arguments:\n");
  printf("  <ctl>        Control file.\n");
  printf("  <lapse.tab>  Output table for lapse-rate statistics.\n");
  printf("  <met*>       Meteorological input files.\n");
  printf("\nFurther information:\n");
  printf("  Manual: https://slcs-jsc.github.io/mptrac/\n");
}