Measurements
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A measurement is one quantity under one name; a series is one dataset's column for it. Two datasets' series count as one measurement only where they carry the same NERC P01 concept for the same kind of sample — 5 do today: Temperature, Potential density (σθ), Salinity, Dissolved oxygen (ml/L), Dissolved oxygen (µmol/kg) — so 103 series make 97 measurements. 51 of the 97 carry a NERC P01 concept; 46 carry none and keep their own names, because an empty concept means no concept says exactly this, never that nobody looked.
Values: 34 M at the release grain (rows of obs_env, one measurement × one sample), 64,994 one per cast (rows of sample_measurement: the mixed-layer depths and the chlorophyll maximum and integral), 340 M with the two full-resolution supplementals, obs_ctd_full and obs_mets_full.
The machine-readable form is one JSON per measurement (/measurements/{key}.json) and sitemap.xml.
97 measurements 103 series 7 datasets 34 M values 51 with a NERC concept v2026.10.21
Measured across datasets 5 keys, bottle and CTD alike
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Temperature°C Hydrographic BottleCTD Cast Files 1949–20261.6 M valuesunifiedanomaly
temperature - kg/m³ Hydrographic BottleCTD Cast Files 1949–20261.5 M valuesunifiedanomaly
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SalinityPSS-78 Hydrographic BottleCTD Cast Files 1949–20261.5 M valuesunifiedanomaly
salinity -
Dissolved oxygen (ml/L)ml/L Hydrographic BottleCTD Cast Files 1949–20261.4 M valuesunifiedanomaly
oxygen_ml_l -
Dissolved oxygen (µmol/kg)µmol/kg Hydrographic BottleCTD Cast Files 1949–20261.3 M valuesunifiedanomaly
oxygen_umol_kg
By category 5 categories · open one to list its measurements
Physical OceanographyTemperature, salinity, density, oxygen, pressure and dynamic height from bottles and CTD casts 44 measurements + 5 above
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Spicinesskg/m³ Bottle Derived ProductsCTD Derived Products 1949–20261.5 M valuesanomaly
spiciness0Spice (spiciness at 0 dbar, TEOS-10); positive spicy (warm, salty), negative minty - m Hydrographic Bottle 1949–2021895 k valuesanomaly
- °C Hydrographic Bottle 1949–2021849 k valuesanomaly
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Reported dynamic heightdyn m Hydrographic Bottle 1949–2021849 k valuesanomaly
r_dynamic_heightReported dynamic height, legacy DECODR value (no QC'd counterpart) -
Reported specific volume anomaly10⁻⁸ m³/kg Hydrographic Bottle 1949–2021843 k valuesanomaly
r_salinity_svaReported Specific Volume Anomaly (pre-QC); WARNING: different parameter/scale than salinity PSS-78 -
Potential density (TEOS-10)kg/m³ Bottle Derived Products 1949–2021842 k valuesanomaly
sigma_theta_teos10Potential density anomaly (sigma-theta, TEOS-10) per bottle, from the bottle's own temperature and salinity -
Pressuredbar CTD Cast Files 1993–2026703 k valuesanomaly
pressure - PSU CTD Cast Files 1993–2026703 k valuesanomaly
- ml/L CTD Cast Files 1993–2026701 k valuesanomaly
- % Hydrographic Bottle 1949–2021691 k valuesanomaly
- µmol/kg Hydrographic Bottle 1949–2021691 k valuesanomaly
- PSU CTD Cast Files 1993–2026686 k valuesanomaly
- µmol/kg CTD Cast Files 1993–2026683 k valuesanomaly
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Potential density (sensor mean)kg/m³ CTD Derived Products 1993–2026682 k valuesanomaly
sigma_theta_avePotential density anomaly (sigma-theta), sensor-pair average by the provider's flags - ml/L CTD Cast Files 1993–2026681 k valuesanomaly
- ml/L CTD Cast Files 1993–2026680 k valuesanomaly
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Dynamic heightdyn m CTD Cast Files 1993–2026674 k valuesanomaly
dynamic_height - ml/L CTD Cast Files 1993–2026664 k valuesanomaly
- % CTD Cast Files 1993–2026619 k valuesanomaly
- 1/m CTD Cast Files 1993–2026618 k valuesanomaly
- PSU CTD Cast Files 1998–2026572 k valuesanomaly
- PSU CTD Cast Files 1998–2026555 k valuesanomaly
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Specific volume anomaly10⁻⁸ m³/kg CTD Cast Files 1993–2026550 k valuesanomaly
specific_volume_anomaly - ml/L CTD Cast Files 1999–2026346 k valuesanomaly
- µmol/kg CTD Cast Files 1999–2026326 k valuesanomaly
- ml/L CTD Cast Files 1999–2026324 k valuesanomaly
- ml/L CTD Cast Files 1999–2026318 k valuesanomaly
- m CTD Cast Files 1993–2026160 k valuesanomaly
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Bottle salinityPSU CTD Cast Files 1993–2026155 k valuesanomaly
salinity_btl -
Bottle temperature°C CTD Cast Files 1993–2026146 k valuesanomaly
btl_temperature - ml/L CTD Cast Files 1993–2026145 k valuesanomaly
- µmol/kg CTD Cast Files 1993–2026130 k valuesanomaly
- PSU Underway Meteorological (METS) 2004–202250 k values
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Underway temperature (TSG 1)°C Underway Meteorological (METS) 2004–202249 k values
tsg1_temp_cTSG unit 1 temperature (physical sensor unconfirmed -- mets_03) - °C Underway Meteorological (METS) 2010–202248 k values
- L/min Underway Meteorological (METS) 2010–202242 k values
- PSU Underway Meteorological (METS) 2010–202133 k values
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Mixed-layer depth (ΔT 0.2 °C)m CTD Derived Products 1993–20269,605 valuesanomalyper cast
mld_temperature_02Mixed-layer depth, temperature departure of 0.2 degC from 10 m (de Boyer Montegut et al. 2004) -
Mixed-layer depth (Δσθ 0.02)m CTD Derived Products 1993–20269,360 valuesanomalyper cast
mld_sigma_theta_002Mixed-layer depth: where sigma-theta is 0.02 kg/m3 greater than at 10 m (CalCOFI legacy definition) - — Underway Meteorological (METS) 2016–20229,190 values
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Mixed-layer depth (Δσθ 0.125)m CTD Derived Products 1993–20269,177 valuesanomalyper cast
mld_sigma_theta_0125Mixed-layer depth, sigma-theta increase of 0.125 kg/m3 from 10 m (Levitus 1982) - PSS-78 Carbonate Chemistry / DIC 1983–20214,081 valuesanomaly
- °C Carbonate Chemistry / DIC 1983–20214,009 valuesanomaly
- m Underway Meteorological (METS) 2018–2022522 values
Nutrients & ChemistryNitrate, nitrite, phosphate, silicate and ammonium from bottle samples; particulate and total organic carbon and nitrogen, nitrate isotopes, and trace metals (iron) 15 measurements
- µmol/L Hydrographic Bottle 1949–2021441 k valuesanomaly
- µmol/L Hydrographic Bottle 1959–2021382 k valuesanomaly
- µmol/L Hydrographic Bottle 1959–2021365 k valuesanomaly
- µmol/L Hydrographic Bottle 1959–2021364 k valuesanomaly
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ISUS nitrate voltageV CTD Cast Files 2004–2026351 k valuesanomaly
isus_v - µmol/L CTD Cast Files 2004–2026314 k valuesanomaly
- µmol/L CTD Cast Files 2004–2026295 k valuesanomaly
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Bottle silicateµmol/L CTD Cast Files 1993–2026146 k valuesanomaly
btl_silicate -
Bottle phosphateµmol/L CTD Cast Files 1993–2026145 k valuesanomaly
btl_phosphate -
Bottle nitrateµmol/L CTD Cast Files 1993–2026145 k valuesanomaly
btl_nitrate -
Bottle nitriteµmol/L CTD Cast Files 1993–2026144 k valuesanomaly
btl_nitrite - µmol/L Hydrographic Bottle 2008–202191 k valuesanomaly
- µmol/L Hydrographic Bottle 2008–202190 k valuesanomaly
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Bottle ammoniumµmol/L CTD Cast Files 2008–202670 k valuesanomaly
btl_ammonium - nmol/L Dissolved iron 2002–2004170 values
Carbonate SystemDissolved inorganic carbon, alkalinity, pH and pCO2 6 measurements
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pHpH CTD Cast Files 2009–2026218 k valuesanomaly
ph - µmol/kg Carbonate Chemistry / DIC 1983–20214,236 valuesanomaly
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Total alkalinityµmol/kg Carbonate Chemistry / DIC 1984–20214,063 valuesanomaly
alkalinity - — Underway Meteorological (METS) 2016–20182,473 values
- µmol/kg Hydrographic Bottle 2008–20152,084 valuesanomaly
- µmol/kg Hydrographic Bottle 2008–20151,999 valuesanomaly
Productivity & PigmentsChlorophyll a, phaeopigments, primary production (C14) and light (PAR) 20 measurements
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Fluorescence voltageV CTD Cast Files 1993–2026703 k valuesanomaly
fluorescence_v - µE/m²/s CTD Cast Files 1993–2026588 k valuesanomaly
- µE/m²/s CTD Cast Files 1993–2026501 k valuesanomaly
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Estimated chlorophyll-a, station-correctedµg/L CTD Cast Files 1993–2026358 k valuesanomaly
est_chlorophyll_a_sta_corrEst. chlorophyll-a station-corrected -
Estimated chlorophyll-a, cruise-correctedµg/L CTD Cast Files 1993–2026328 k valuesanomaly
est_chlorophyll_a_cruise_corrEst. chlorophyll-a cruise-corrected - µg/L Hydrographic Bottle 1973–2021246 k valuesanomaly
- µg/L Hydrographic Bottle 1973–2021246 k valuesanomaly
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Bottle chlorophyll-aµg/L CTD Cast Files 1993–2026115 k valuesanomaly
btl_chlorophyll_a -
Bottle phaeopigmentµg/L CTD Cast Files 1993–2026115 k valuesanomaly
btl_phaeopigment - µg/L Underway Meteorological (METS) 2010–202250 k values
- mgC/m³/hld Hydrographic Bottle 1984–202024 k valuesanomaly
- mgC/m³/hld Hydrographic Bottle 1984–202024 k valuesanomaly
- % Hydrographic Bottle 1984–202020 k valuesanomaly
- mgC/m³/hld Hydrographic Bottle 1984–202016 k valuesanomaly
- mgC/m³/hld Hydrographic Bottle 1984–202016 k valuesanomaly
- — Underway Meteorological (METS) 2016–202211 k values
- µg/L CTD Derived Products 1993–20269,255 valuesanomalyper cast
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Chlorophyll maximum depthm CTD Derived Products 1993–20269,255 valuesanomalyper cast
chl_max_depthDepth of the chlorophyll-a maximum (DCM): the highest value of a 3 m running mean -
Integrated chlorophyll-amg/m² CTD Derived Products 1993–20269,171 valuesanomalyper cast
chl_integratedChlorophyll-a integrated over the top 200 m (or the cast bottom): the sum of the 1 m bins -
Chlorophyll integration depthm CTD Derived Products 1993–20269,171 valuesper cast
chl_integrated_depthDepth reached by chl_integrated (200 m unless the cast is shallower)
Meteorology & Sea StateWind, air temperature, pressure, cloud, visibility, sea state and water colour from the underway METS and ship observations 7 measurements
- mb Underway Meteorological (METS) 2016–202237 k values
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Wind directiondegrees Underway Meteorological (METS) 2016–202236 k values
wind_dir_deg -
Wind speedm/s Underway Meteorological (METS) 2016–202236 k values
wind_speed_ms -
Air temperature°C Underway Meteorological (METS) 2016–202228 k values
air_temp_c -
Relative humiditypercent Underway Meteorological (METS) 2016–202228 k values
rel_humidity_pct -
Longwave radiationW/m² Underway Meteorological (METS) 2016–202226 k values
long_wave_rad -
Shortwave radiationW/m² Underway Meteorological (METS) 2016–202226 k values
short_wave_rad
No measurement matches — try a variable, a series name, a dataset, a unit or a NERC id.
Category is the registry's (metadata/category.csv, the same the Explorer folds its picker by). A key is the registry's variable where the crosswalk unifies two series, else the measurement type itself; 51 keys carry a NERC P01 concept.
Which measurements, in which datasets, in which years
One row per measurement, one bar per dataset that carries it, 1949 on the left and the release year on the right; hover a bar for the dataset, its series, years, values, sampling events and depths. Two bars in a row are two datasets measuring the same thing — the bottle's temperature and the CTD's temperature_ave, comparable across datasets — never a dataset's own bottle samples beside its sensor (the CTD files' btl_* series stay their own rows, so the bottle dataset is not counted twice). The values column is the release grain (obs_env); the CTD and METS full-resolution tables carry more behind the same names.
Which measurements, in which datasets
measurements · category × datasetThe datasets
series · years · valuesDataset colour is never the only cue: the name is always beside the dot, and the matrix is one sequential ramp.