netcdf precipitation/tp_EPE_ERA5_0p5deg_6hr_2021_global.nc {
  dimensions:
    latitude = 361;
    longitude = 720;
    time = 1460;
  variables:
    double latitude(latitude=361);
      :_FillValue = NaN; // double
      :standard_name = "latitude";
      :long_name = "latitude";
      :units = "degrees_north";
      :axis = "Y";
      :_ChunkSizes = 361U; // uint

    double longitude(longitude=720);
      :_FillValue = NaN; // double
      :standard_name = "longitude";
      :long_name = "longitude";
      :units = "degrees_east";
      :axis = "X";
      :_ChunkSizes = 720U; // uint

    long time(time=1460);
      :standard_name = "time";
      :long_name = "time";
      :bounds = "time_bnds";
      :axis = "T";
      :units = "hours since 2021-01-01 03:00:00";
      :calendar = "proleptic_gregorian";

    float tp(time=1460, latitude=361, longitude=720);
      :_FillValue = NaNf; // float
      :standard_name = "precipitation_amount";
      :long_name = "Total precipitation (6-hour accumulation)";
      :units = "m";
      :_ChunkSizes = 292U, 73U, 144U; // uint

    byte epe_p90(time=1460, latitude=361, longitude=720);
      :description = "Binary indicator (1=True, 0=False) of precipitation exceeding the 90th percentile of precipitation intensity (1940-2024 baseline).";
      :long_name = "Extreme precipitation event flag (>90th percentile)";
      :units = "1";
      :_ChunkSizes = 487U, 121U, 240U; // uint

    byte epe_p95(time=1460, latitude=361, longitude=720);
      :long_name = "Extreme precipitation event flag (>95th percentile)";
      :description = "Binary indicator (1=True, 0=False) of precipitation exceeding the 95th percentile of precipitation intensity (1940-2024 baseline).";
      :units = "1";
      :_ChunkSizes = 487U, 121U, 240U; // uint

    byte epe_p99(time=1460, latitude=361, longitude=720);
      :long_name = "Extreme precipitation event flag (>99th percentile)";
      :description = "Binary indicator (1=True, 0=False) of precipitation exceeding the 99th percentile of precipitation intensity (1940-2024 baseline).";
      :units = "1";
      :_ChunkSizes = 487U, 121U, 240U; // uint

  // global attributes:
  :conventions = "CF-1.12";
  :title = "ERA5 total precipitation and extreme precipitation flags aligned with PIKART AR catalog (0.5deg, 6-hourly, 1940-2024)";
  :version = "1.0";
  :source = "ERA5 reanalysis total precipitation aggregated to 0.5 degree and 6-hourly resolution";
  :institution = "Potsdam Institute for Climate Impact Research (PIK) and Leipzig University";
  :references = "Hersbach et al. (2020), ERA5 global reanalysis. Vallejo-Bernal & Braun et al. (2025), PIKART AR catalog.";
  :comment = "Extreme precipitation events (EPE) are defined as grid-cell exceedances of the 90th, 95th, and 99th percentiles of precipitation intensity computed for the period 1940-2024. Thresholds are derived from wet days, i.e., days with tp >= 1 mm per 6 hours.";
  :history = "Created on February 13, 2026";
}