{
  "key": "chl_integrated",
  "slug": "chl_integrated",
  "label": "Chlorophyll-a integrated over the top 200 m (or the cast bottom): the sum of the 1 m bins",
  "short_label": "Integrated chlorophyll-a",
  "description": "Chlorophyll-a integrated over the top 200 m (or the cast bottom): the sum of the 1 m bins",
  "units": "mg/m2",
  "units_nerc_p06": null,
  "nerc_p01": null,
  "category": {
    "key": null,
    "name": "Productivity & Pigments",
    "icon": "cat-productivity",
    "realm": "env",
    "order": 4
  },
  "is_unified": false,
  "derivation": "calcofi4db::ctd_integrate(z_max = 200, z_top_max = 5, method = 'sum'): the sum of the 1 m bins of est_chlorophyll_a_sta_corr (ug/L = mg/m3) from the surface to 200 m or the deepest good bin; the provider's CTD rule (Rasmus Swalethorp 2026-09-23, questions Q02); a bin missing inside the profile is interpolated, the shallowest bin is carried to the surface when it is no deeper than 5 m, else absent; chl_integrated_depth says how deep it reached",
  "climatology": true,
  "bounds": {
    "valid_min": 0,
    "valid_max": 200000,
    "declared_by": [
      "chl_integrated"
    ]
  },
  "totals": {
    "n_values": 9171,
    "n_samples": 9171,
    "n_roots": 9171,
    "n_datasets": 1,
    "year_min": 1993,
    "year_max": 2026,
    "depth_min_m": null,
    "depth_max_m": null,
    "qual_ok_n": 9171,
    "n_flagged": 0
  },
  "series": [
    {
      "measurement_type": "chl_integrated",
      "dataset_key": "calcofi_ctd-derived",
      "source_column": "est_chlorophyll_a_sta_corr",
      "qual_column": null,
      "description": "Chlorophyll-a integrated over the top 200 m (or the cast bottom): the sum of the 1 m bins",
      "units": "mg/m2",
      "nerc_p01": null,
      "is_canonical": true,
      "n_values": 9171,
      "n_samples": 9171,
      "n_roots": 9171,
      "n_cells": 109,
      "n_cruises": 136,
      "year_min": 1993,
      "year_max": 2026,
      "depth_min_m": null,
      "depth_max_m": null,
      "years": {
        "1993": 130,
        "1994": 263,
        "1995": 259,
        "1996": 281,
        "1997": 274,
        "1998": 406,
        "1999": 258,
        "2000": 255,
        "2001": 251,
        "2002": 254,
        "2003": 251,
        "2004": 270,
        "2005": 293,
        "2006": 296,
        "2007": 286,
        "2008": 282,
        "2009": 308,
        "2010": 305,
        "2011": 316,
        "2012": 278,
        "2013": 326,
        "2014": 255,
        "2015": 305,
        "2016": 347,
        "2017": 325,
        "2018": 294,
        "2019": 237,
        "2020": 227,
        "2021": 264,
        "2022": 222,
        "2023": 318,
        "2024": 238,
        "2025": 225,
        "2026": 72
      },
      "months": [
        1627,
        551,
        372,
        1920,
        111,
        123,
        1545,
        656,
        117,
        941,
        1184,
        24
      ],
      "depth_bands": {
        "0-10": 0,
        "10-50": 0,
        "50-100": 0,
        "100-200": 0,
        "200-500": 0,
        "500-1000": 0,
        "1000-2000": 0,
        "2000+": 0
      },
      "qual": {
        "none": 9171
      },
      "qual_ok_n": 9171,
      "n_flagged": 0,
      "observed": {
        "min": 0.938500000000002,
        "p05": 21.99185,
        "p50": 36.2686,
        "p95": 159.21985,
        "max": 984.2436
      },
      "out_of_bounds": {
        "n": 0,
        "min": null,
        "max": null
      },
      "flags": [
        "no_flag_at_grain",
        "no_p01"
      ],
      "grain": "sample"
    }
  ],
  "related": [],
  "flags": [
    "no_label"
  ],
  "face": {
    "kind": "standsin",
    "face_of": "chlorophyll_a",
    "stands_in_note": "stands in: chlorophyll-a's face (the profile integrated through the water column)",
    "source": "no NERC P01 on this key (D3)"
  },
  "method": [
    {
      "dataset_key": "calcofi_ctd-derived",
      "measurement_type": "chl_integrated",
      "platform": "ctd",
      "instrument": "Computed from the CTD fluorometer profile (corrected to bottle chlorophyll-a)",
      "nerc_l22": null,
      "principle": "Chlorophyll-a integrated through the water column: the station-corrected CTD profile summed over the top 200 m, or to the cast depth on a shallower station.",
      "steps": [
        "integrate the 1 m bins from the surface to 200 m or the cast bottom"
      ],
      "wavelength_nm": null,
      "precision": null,
      "bibkeys": [],
      "calcofi_org_url": null,
      "text_fragment": null,
      "source": "the record's own derivation (measurement_type.csv); questions Q02 (Rasmus Swalethorp, 2026-09-23)",
      "source_url": null
    }
  ],
  "why": [
    {
      "rank": 1,
      "kind": "authored",
      "text": "Every phytoplankter carries chlorophyll-a, so adding it up through the water column gives the plant life under each square metre of sea, a number that does not depend on which depth the peak sits at.",
      "bibkeys": [
        "chavez2011"
      ],
      "source_url": null,
      "eov": "Phytoplankton biomass and diversity",
      "goos_doc": "https://goosocean.org/document/17507"
    },
    {
      "rank": 2,
      "kind": "authored",
      "text": "The sum runs from the surface to 200 m, or to the bottom of the cast on a shallower station, and chl_integrated_depth says how deep each one reached, so a cast that stopped short is not mistaken for a thin one.",
      "bibkeys": [],
      "source_url": null,
      "eov": "Phytoplankton biomass and diversity",
      "goos_doc": "https://goosocean.org/document/17507"
    },
    {
      "rank": 3,
      "kind": "wikipedia",
      "text": "Chlorophyll a",
      "bibkeys": [],
      "source_url": "https://en.wikipedia.org/wiki/Chlorophyll_a",
      "eov": "Phytoplankton biomass and diversity",
      "goos_doc": "https://goosocean.org/document/17507"
    },
    {
      "rank": 4,
      "kind": "wikipedia",
      "text": "Primary production",
      "bibkeys": [],
      "source_url": "https://en.wikipedia.org/wiki/Primary_production",
      "eov": "Phytoplankton biomass and diversity",
      "goos_doc": "https://goosocean.org/document/17507"
    }
  ],
  "grain": "sample"
}