{
  "key": "sigma_theta_teos10",
  "slug": "sigma_theta_teos10",
  "label": "Potential density anomaly (sigma-theta, TEOS-10) per bottle, from the bottle's own temperature and salinity",
  "short_label": "Potential density (TEOS-10)",
  "description": "Potential density anomaly (sigma-theta, TEOS-10) per bottle, from the bottle's own temperature and salinity",
  "units": "kg/m3",
  "units_nerc_p06": "http://vocab.nerc.ac.uk/collection/P06/current/UKMC/",
  "nerc_p01": "http://vocab.nerc.ac.uk/collection/P01/current/SIGTPR03/",
  "category": {
    "key": null,
    "name": "Physical Oceanography",
    "icon": "cat-physical",
    "realm": "env",
    "order": 1
  },
  "is_unified": false,
  "derivation": "calcofi4db::bottle_spice_sigma0(): sea pressure gsw_p_from_z(-depth, latitude), then gsw_SA_from_SP, gsw_CT_from_t, gsw_sigma0 (TEOS-10, IOC/SCOR/IAPSO 2010) on the bottle's own temperature (T_degC) and salinity (Salnty); a bottle whose T_qual or S_qual is 8 or 9 has none. The bottle database's own sigma_theta is DECODR's legacy value, kept beside it",
  "climatology": true,
  "bounds": {
    "valid_min": -8,
    "valid_max": 37,
    "declared_by": [
      "sigma_theta_teos10"
    ]
  },
  "totals": {
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    "n_samples": 841673,
    "n_roots": 34790,
    "n_datasets": 1,
    "year_min": 1949,
    "year_max": 2021,
    "depth_min_m": 0,
    "depth_max_m": 5351,
    "qual_ok_n": 841673,
    "n_flagged": 0
  },
  "series": [
    {
      "measurement_type": "sigma_theta_teos10",
      "dataset_key": "calcofi_bottle-derived",
      "source_column": "temperature; salinity; depth",
      "qual_column": null,
      "description": "Potential density anomaly (sigma-theta, TEOS-10) per bottle, from the bottle's own temperature and salinity",
      "units": "kg/m3",
      "nerc_p01": "http://vocab.nerc.ac.uk/collection/P01/current/SIGTPR03/",
      "is_canonical": true,
      "n_values": 841673,
      "n_samples": 841673,
      "n_roots": 34790,
      "n_cells": 222,
      "n_cruises": 649,
      "year_min": 1949,
      "year_max": 2021,
      "depth_min_m": 0,
      "depth_max_m": 5351,
      "years": {
        "1949": 26691,
        "1950": 36802,
        "1951": 11388,
        "1952": 28166,
        "1953": 28712,
        "1954": 18275,
        "1955": 22411,
        "1956": 13735,
        "1957": 18531,
        "1958": 23938,
        "1959": 33689,
        "1960": 26566,
        "1961": 13797,
        "1962": 13659,
        "1963": 12255,
        "1964": 11221,
        "1965": 9051,
        "1966": 11778,
        "1967": 4110,
        "1968": 5694,
        "1969": 23714,
        "1970": 867,
        "1971": 795,
        "1972": 29755,
        "1973": 1161,
        "1974": 8588,
        "1975": 24105,
        "1976": 4421,
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        "1978": 24665,
        "1980": 1224,
        "1981": 8004,
        "1982": 698,
        "1983": 4130,
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        "1989": 9380,
        "1990": 7694,
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        "1992": 8398,
        "1993": 8049,
        "1994": 7783,
        "1995": 7721,
        "1996": 8617,
        "1997": 8379,
        "1998": 12170,
        "1999": 7799,
        "2000": 7779,
        "2001": 7814,
        "2002": 7781,
        "2003": 8592,
        "2004": 7758,
        "2005": 7933,
        "2006": 8104,
        "2007": 8187,
        "2008": 8242,
        "2009": 8522,
        "2010": 7946,
        "2011": 8567,
        "2012": 7370,
        "2013": 8285,
        "2014": 6636,
        "2015": 7881,
        "2016": 8936,
        "2017": 8392,
        "2018": 7571,
        "2019": 6189,
        "2020": 5881,
        "2021": 1548
      },
      "months": [
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      "depth_bands": {
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        "10-50": 161509,
        "50-100": 139766,
        "100-200": 167195,
        "200-500": 211470,
        "500-1000": 83928,
        "1000-2000": 17593,
        "2000+": 3962
      },
      "qual": {
        "none": 841673
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      "qual_ok_n": 841673,
      "n_flagged": 0,
      "observed": {
        "min": 20.9378938441356,
        "p05": 24.1153152099454,
        "p50": 25.9864072914108,
        "p95": 27.2019251380314,
        "max": 28.1521298048476
      },
      "out_of_bounds": {
        "n": 0,
        "min": null,
        "max": null
      },
      "flags": [
        "no_flag_at_grain"
      ]
    }
  ],
  "related": [],
  "flags": [
    "no_label"
  ],
  "face": {
    "kind": "scale",
    "face_of": null,
    "stands_in_note": null,
    "source": "NERC P01 http://vocab.nerc.ac.uk/collection/P01/current/SIGTPR03/ names a property, not a substance or organism (as sigma_theta's SIGTEQ01, D3); a key with its own P01 cannot stand in"
  },
  "method": [
    {
      "dataset_key": "calcofi_bottle-derived",
      "measurement_type": "sigma_theta_teos10",
      "platform": "bottle",
      "instrument": "Computed from the bottle's own temperature and salinity (TEOS-10)",
      "nerc_l22": null,
      "principle": "Potential density anomaly referenced to 0 dbar (sigma-theta) by TEOS-10, from each bottle's own temperature and salinity at the sea pressure of its depth; the modern value beside the bottle database's legacy DECODR sigma_theta. A bottle whose temperature or salinity the provider flags 8 or 9 has none.",
      "steps": [
        "gsw_p_from_z",
        "gsw_SA_from_SP",
        "gsw_CT_from_t",
        "gsw_sigma0"
      ],
      "wavelength_nm": null,
      "precision": null,
      "bibkeys": [],
      "calcofi_org_url": null,
      "text_fragment": null,
      "source": "the record's own derivation (measurement_type.csv; calcofi4db::bottle_spice_sigma0())",
      "source_url": null
    }
  ],
  "anomaly": {
    "baseline": [
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      2013
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    "ymax": 0.5554,
    "spark_band": "10-50",
    "min_cruises": 2,
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