{
  "revision": "P2-R07",
  "created": "2026-10-09",
  "snow": {
    "id": "snow-march-minima-1982-2021-r06",
    "license": "CC BY 4.0",
    "source": "Michel et al. 2023, SnowQM revision dataset, Zenodo 7886773",
    "grid": {
      "crs": "EPSG:2056",
      "bounds": [
        2474000,
        1059000,
        2844000,
        1324000
      ],
      "nx": 370,
      "ny": 265,
      "resolution_m": 1000,
      "row_order": "north_to_south",
      "common_valid_cells": 42354,
      "area_km2": 42354
    },
    "selection": {
      "indicator": "Estimated snow area = count(SWE >= 1 mm) × 1 km² over a fixed common-valid mask",
      "window": "March 1–31, 1982–2021: 1240 original daily fields",
      "minimum": "argmin of estimated snow area, exact ties choose earliest date",
      "display": "SWE on selected minimum-area day; not minimum SWE or March mean",
      "mask": "Finite SWE in all 1240 days; snow-free zero retained; missing excluded",
      "snow_area_method_change": "R05 used 250 m SCF fractional area. R06 uses 1 km SWE >= 1 mm proxy because SnowQM does not contain SCF; the two series are not spliced.",
      "swe_levels_mm": [
        25,
        100,
        250,
        500,
        800
      ],
      "version": "Prepublication revision dataset (2023), public CC BY 4.0 release; not the 2025 SPASS update",
      "interpretation": "40 March minimum-area days; not whole-winter minima or water delivered downstream",
      "threshold_sensitivity": {
        "1982": {
          "0.5": 30,
          "1": 30,
          "5": 30
        },
        "1983": {
          "0.5": 25,
          "1": 25,
          "5": 25
        },
        "1984": {
          "0.5": 30,
          "1": 30,
          "5": 31
        },
        "1985": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "1986": {
          "0.5": 30,
          "1": 30,
          "5": 30
        },
        "1987": {
          "0.5": 29,
          "1": 29,
          "5": 29
        },
        "1988": {
          "0.5": 30,
          "1": 30,
          "5": 30
        },
        "1989": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "1990": {
          "0.5": 25,
          "1": 25,
          "5": 25
        },
        "1991": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "1992": {
          "0.5": 22,
          "1": 22,
          "5": 22
        },
        "1993": {
          "0.5": 23,
          "1": 23,
          "5": 23
        },
        "1994": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "1995": {
          "0.5": 27,
          "1": 27,
          "5": 27
        },
        "1996": {
          "0.5": 27,
          "1": 27,
          "5": 27
        },
        "1997": {
          "0.5": 28,
          "1": 28,
          "5": 28
        },
        "1998": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "1999": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2000": {
          "0.5": 25,
          "1": 25,
          "5": 25
        },
        "2001": {
          "0.5": 29,
          "1": 28,
          "5": 29
        },
        "2002": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2003": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2004": {
          "0.5": 22,
          "1": 22,
          "5": 23
        },
        "2005": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2006": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2007": {
          "0.5": 18,
          "1": 18,
          "5": 18
        },
        "2008": {
          "0.5": 16,
          "1": 16,
          "5": 16
        },
        "2009": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2010": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2011": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2012": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2013": {
          "0.5": 24,
          "1": 24,
          "5": 24
        },
        "2014": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2015": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2016": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2017": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2018": {
          "0.5": 29,
          "1": 29,
          "5": 29
        },
        "2019": {
          "0.5": 31,
          "1": 31,
          "5": 31
        },
        "2020": {
          "0.5": 29,
          "1": 29,
          "5": 29
        },
        "2021": {
          "0.5": 31,
          "1": 31,
          "5": 31
        }
      }
    },
    "unit_conversion": {
      "input_values": "metres water equivalent",
      "output_values": "millimetres water equivalent",
      "factor": 1000,
      "metadata_conflict": "Downloaded climatology header incorrectly says millimeter; published author code save.netcdf explicitly writes m, plots SWE (m), packaged sample files declare mSWE. Paper minimum 0.5 mm corresponds to code 0.0005. Conversion based on these primary-source definitions.",
      "evidence": "https://doi.org/10.5281/zenodo.10257951; R/io.R:284, R/utils_plot_functions.R:123, src/quantile_application.cpp:160; paper section 2.2"
    }
  },
  "ocean": {
    "source": "NOAA AIS / SanctSound SB02_13",
    "doi": "10.25921/byp4-r188",
    "date": "2020-11-23",
    "unit": "hourly median band SPL, dB re 1 µPa",
    "no_audio": true
  },
  "climate": {
    "source": "World Bank CCKP CMIP6",
    "license": "CC BY-SA 4.0",
    "period": "2080–2099 / 1995–2014",
    "aggregation": "provider model median; low 27 models, high 28; display sampled to 1 degree"
  },
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