{
  "key": "oxygen_ml_l_ave_cruise_corr",
  "slug": "oxygen_ml_l_ave_cruise_corr",
  "label": "DO average cruise-corrected",
  "short_label": "Oxygen sensor mean, cruise-corrected",
  "description": "DO average cruise-corrected",
  "units": "ml/L",
  "units_nerc_p06": "http://vocab.nerc.ac.uk/collection/P06/current/UMLL/",
  "nerc_p01": "http://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX/",
  "category": {
    "key": null,
    "name": "Physical Oceanography",
    "icon": "cat-physical",
    "realm": "env",
    "order": 1
  },
  "is_unified": false,
  "derivation": "Built by the ingest from the two cruise-corrected oxygen sensors (Ox1_CruiseCorr, Ox2_CruiseCorr) by the sensor-pair flag rule (calcofi4db::combine_sensor_pair_sql(): drop 8/9, honour 1/2, else the mean, one alone when the other is missing). Cruise-corrected = ONE regression per cruise against all its bottles; the source ships no average of this pair.",
  "climatology": true,
  "bounds": {
    "valid_min": 0,
    "valid_max": 15,
    "declared_by": [
      "oxygen_ml_l_ave_cruise_corr"
    ]
  },
  "totals": {
    "n_values": 681492,
    "n_samples": 9500,
    "n_roots": 9500,
    "n_datasets": 1,
    "year_min": 1993,
    "year_max": 2026,
    "depth_min_m": 1,
    "depth_max_m": 3630,
    "qual_ok_n": 681492,
    "n_flagged": 0
  },
  "series": [
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      "measurement_type": "oxygen_ml_l_ave_cruise_corr",
      "dataset_key": "calcofi_ctd-cast",
      "source_column": null,
      "qual_column": null,
      "description": "DO average cruise-corrected",
      "units": "ml/L",
      "nerc_p01": "http://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX/",
      "is_canonical": true,
      "n_values": 681492,
      "n_samples": 9500,
      "n_roots": 9500,
      "n_cells": 113,
      "n_cruises": 138,
      "year_min": 1993,
      "year_max": 2026,
      "depth_min_m": 1,
      "depth_max_m": 3630,
      "years": {
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        "1994": 21769,
        "1995": 20842,
        "1996": 23045,
        "1997": 21788,
        "1998": 32333,
        "1999": 20615,
        "2000": 19690,
        "2001": 18035,
        "2002": 19680,
        "2003": 22044,
        "2004": 23621,
        "2005": 20502,
        "2006": 22477,
        "2007": 21595,
        "2008": 21265,
        "2009": 23763,
        "2010": 22484,
        "2011": 23349,
        "2012": 18926,
        "2013": 22092,
        "2014": 17536,
        "2015": 24290,
        "2016": 23887,
        "2017": 21363,
        "2018": 18642,
        "2019": 15177,
        "2020": 16355,
        "2021": 17352,
        "2022": 15531,
        "2023": 21964,
        "2024": 17860,
        "2025": 15172,
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      "depth_bands": {
        "0-10": 16837,
        "10-50": 87998,
        "50-100": 108026,
        "100-200": 142642,
        "200-500": 281972,
        "500-1000": 37580,
        "1000-2000": 3200,
        "2000+": 3237
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      "qual": {
        "none": 681492
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      "qual_ok_n": 681492,
      "n_flagged": 0,
      "observed": {
        "min": 0.0012,
        "p05": 0.4174,
        "p50": 2.6962,
        "p95": 6.0331225,
        "max": 9.7429
      },
      "out_of_bounds": {
        "n": 0,
        "min": null,
        "max": null
      },
      "flags": [
        "no_flag_at_grain"
      ]
    }
  ],
  "related": [
    {
      "key": "oxygen_btl_ml_l",
      "why": "same_bottles"
    },
    {
      "key": "oxygen_ml_l",
      "why": "sensor_vs_mean"
    },
    {
      "key": "oxygen_ml_l_1",
      "why": "paired_sensors"
    },
    {
      "key": "oxygen_ml_l_1_cruise_corr",
      "why": "paired_sensors"
    },
    {
      "key": "oxygen_ml_l_1_sta_corr",
      "why": "paired_sensors"
    },
    {
      "key": "oxygen_ml_l_2",
      "why": "paired_sensors"
    },
    {
      "key": "oxygen_ml_l_2_cruise_corr",
      "why": "paired_sensors"
    },
    {
      "key": "oxygen_ml_l_2_sta_corr",
      "why": "paired_sensors"
    }
  ],
  "flags": [
    "no_label"
  ],
  "face": {
    "kind": "structure",
    "face_of": null,
    "stands_in_note": null,
    "source": "NERC P01 http://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX/ links (via S27) to a ChEBI entity"
  },
  "chem": [
    {
      "chebi": "CHEBI:15379",
      "role": "the_thing",
      "via": "nerc_s27",
      "mass_fraction": null,
      "note": null,
      "source": "NERC P01 http://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX/ -> S27 CS002779 'oxygen' owl:sameAs CHEBI:15379",
      "source_url": "http://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX/"
    }
  ],
  "method": [
    {
      "dataset_key": "calcofi_ctd-cast",
      "measurement_type": "oxygen_ml_l_ave_cruise_corr",
      "platform": "ctd",
      "instrument": "Sea-Bird SBE 43 oxygen sensors (a pair), cruise-corrected",
      "nerc_l22": "http://vocab.nerc.ac.uk/collection/L22/current/TOOL0036/",
      "principle": "Two Sea-Bird SBE 43 membrane oxygen sensors on the pumped CTD line, soaked at 10 m for a few minutes before the downcast so their temperature-dependent response stabilises; each sensor is corrected by one regression per cruise against all of that cruise's Winkler-titrated bottle oxygens. The source ships no average of the pair, so the ingest combines the two corrected sensors by the provider's flags: a sensor flagged 8 or 9 is dropped, 1 or 2 select a sensor, otherwise the two are averaged.",
      "steps": [],
      "wavelength_nm": null,
      "precision": null,
      "bibkeys": [],
      "calcofi_org_url": "https://calcofi.org/sampling-info/methods/ctd-faq-circa-2020/",
      "text_fragment": "SBE43",
      "source": "calcofi.org CTD FAQ circa 2020; the record's own derivation (measurement_type.csv)",
      "source_url": "https://calcofi.org/sampling-info/methods/ctd-faq-circa-2020/#:~:text=SBE43"
    }
  ],
  "why": [
    {
      "rank": 1,
      "kind": "authored",
      "text": "Below the mixed layer off Southern California oxygen has fallen since the 1980s and the hypoxic boundary has risen toward the shelf, squeezing the habitat of fish and invertebrates.",
      "bibkeys": [
        "bograd2008"
      ],
      "source_url": null,
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 2,
      "kind": "authored",
      "text": "Oxygen is the balance of what the ocean takes in at the surface and what animals and bacteria use below; a warmer ocean holds less and mixes less, so it is losing oxygen.",
      "bibkeys": [
        "breitburg2018"
      ],
      "source_url": null,
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 3,
      "kind": "authored",
      "text": "Warming thins the oxygen the surface layer can hold, and the upper ocean has been losing it for decades across the North Pacific, not only here.",
      "bibkeys": [
        "ito2017"
      ],
      "source_url": null,
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 4,
      "kind": "goos",
      "text": "How large are the ocean’s “dead zones” and how fast are they changing?",
      "bibkeys": [],
      "source_url": "https://goosocean.org/document/17473",
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 5,
      "kind": "goos",
      "text": "Is the biomass of the ocean changing?",
      "bibkeys": [],
      "source_url": "https://goosocean.org/document/17473",
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 6,
      "kind": "wikipedia",
      "text": "Ocean deoxygenation",
      "bibkeys": [],
      "source_url": "https://en.wikipedia.org/wiki/Ocean_deoxygenation",
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    },
    {
      "rank": 7,
      "kind": "wikipedia",
      "text": "Hypoxia (environmental)",
      "bibkeys": [],
      "source_url": "https://en.wikipedia.org/wiki/Hypoxia_(environmental)",
      "eov": "Oxygen",
      "goos_doc": "https://goosocean.org/document/17473"
    }
  ],
  "anomaly": {
    "baseline": [
      1993,
      2013
    ],
    "ymax": 1.1032,
    "spark_band": "200-500",
    "min_cruises": 2,
    "bands": [
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          ],
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            1994,
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            1995,
            0.0612,
            4,
            450
          ],
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            1996,
            -0.0673,
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            572
          ],
          [
            1997,
            -0.0551,
            3,
            318
          ],
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            1998,
            -0.2175,
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          ],
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            1999,
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