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CTD Derived Products

CalCOFI CTD Derived Hydrographic Products

calcofi_ctd-derivedCalCOFIunstatedin the release since v2026.10.01

Hydrographic products DERIVED from the CalCOFI CTD cast profiles rather than measured: spice (spiciness at 0 dbar, TEOS-10) and the sensor-pair averaged sigma-theta at every published CTD depth; and, per cast, the … CalCOFI holds 2,021,751 observations from 9,570 sampling events at 113 stations, 1993–2026, 1–3,630 m.

1993–2026
years
2,021,751
observations
9,570
sampling events
113
stations
16
variables
1–3,630 m
depth
What this is

Hydrographic products DERIVED from the CalCOFI CTD cast profiles rather than measured: spice (spiciness at 0 dbar, TEOS-10) and the sensor-pair averaged sigma-theta at every published CTD depth; and, per cast, the mixed-layer depth (the CalCOFI legacy definition, with two alternative criteria beside it), the depth and value of the chlorophyll-a maximum, the chlorophyll-a integrated over the top 200 m, the hypoxic boundary depths (where oxygen falls to 2.4, 1.4 and 0.5 mL/L), the nitracline depth (where nitrate reaches 1 umol/L), the pycnocline depth (the maximum of the TEOS-10 buoyancy frequency N2, also published per depth), by the definitions of the CalCOFI CTD team. Computed from the full-resolution 1 m bins of the CalCOFI CTD Cast Files after the provider’s quality flags are applied.

Physical Oceanography
Temperature, salinity, density, oxygen, pressure and dynamic height from bottles and CTD casts
st53-ln60 · 953 obs · 2003–2025st60-ln60 · 4,925 obs · 2003–2025st70-ln60 · 5,081 obs · 2003–2025st80-ln60 · 4,200 obs · 2003–2025st90-ln60 · 2,757 obs · 2003–2025st100-ln60 · 211 obs · 2003–2003st52-ln63.3 · 856 obs · 2003–2025st55-ln63.3 · 2,090 obs · 2003–2025st60-ln63.3 · 3,246 obs · 2003–2025st70-ln63.3 · 3,810 obs · 2003–2025st80-ln63.3 · 4,141 obs · 2003–2025st90-ln63.3 · 3,257 obs · 2003–2025st100-ln63.3 · 189 obs · 2003–2003st50-ln66.7 · 6,094 obs · 1998–2025st55-ln66.7 · 8,284 obs · 1998–2025st60-ln66.7 · 7,579 obs · 1998–2025st65-ln66.7 · 3,944 obs · 1998–2011st70-ln66.7 · 7,737 obs · 1998–2025st75-ln66.7 · 3,996 obs · 2004–2011st80-ln66.7 · 7,761 obs · 1998–2025st85-ln66.7 · 3,513 obs · 2004–2011st90-ln66.7 · 5,353 obs · 2003–2025st95-ln66.7 · 431 obs · 2007–2007st100-ln66.7 · 602 obs · 2003–2007st51-ln70 · 2,641 obs · 1998–2025st55-ln70 · 4,957 obs · 1998–2025st60-ln70 · 6,518 obs · 1998–2025st70-ln70 · 6,479 obs · 1995–2025st80-ln70 · 5,056 obs · 1998–2025st90-ln70 · 4,292 obs · 2003–2025st100-ln70 · 223 obs · 2003–2003st50-ln73.3 · 1,430 obs · 1997–2025st55-ln73.3 · 4,648 obs · 1998–2025st60-ln73.3 · 4,390 obs · 1998–2025st70-ln73.3 · 4,834 obs · 1998–2025st80-ln73.3 · 4,519 obs · 1998–2025st90-ln73.3 · 3,984 obs · 2003–2025st100-ln73.3 · 704 obs · 2003–2004st49-ln76.7 · 4,398 obs · 1993–2026st51-ln76.7 · 13,969 obs · 1993–2026st55-ln76.7 · 27,907 obs · 1993–2026st60-ln76.7 · 28,825 obs · 1993–2026st70-ln76.7 · 30,280 obs · 1993–2026st80-ln76.7 · 29,968 obs · 1993–2026st90-ln76.7 · 31,281 obs · 1993–2026st100-ln76.7 · 28,582 obs · 1993–2025st50.5-ln80 · 976 obs · 2004–2026st51-ln80 · 5,821 obs · 1993–2026st55-ln80 · 30,053 obs · 1993–2026st60-ln80 · 32,087 obs · 1993–2026st70-ln80 · 30,816 obs · 1993–2026st80-ln80 · 32,106 obs · 1993–2026st90-ln80 · 37,167 obs · 1993–2026st100-ln80 · 33,075 obs · 1993–2026st43.5-ln81.7 · 1,042 obs · 2004–2026st46.9-ln81.8 · 31,876 obs · 1993–2026st39.4-ln83.3 · 793 obs · 1998–2026st40.6-ln83.3 · 3,284 obs · 1993–2026st42-ln83.3 · 11,447 obs · 1993–2026st51-ln83.3 · 9,087 obs · 1993–2026st55-ln83.3 · 30,933 obs · 1993–2026st60-ln83.3 · 32,141 obs · 1993–2026st70-ln83.3 · 32,581 obs · 1993–2025st80-ln83.3 · 32,055 obs · 1993–2025st90-ln83.3 · 31,845 obs · 1993–2026st100-ln83.3 · 31,496 obs · 1993–2026st110-ln83.3 · 28,920 obs · 1993–2026st35.8-ln85.4 · 973 obs · 2004–2026st33-ln86.7 · 5,202 obs · 1993–2026st35-ln86.7 · 30,335 obs · 1993–2026st40-ln86.7 · 35,774 obs · 1993–2026st45-ln86.7 · 29,594 obs · 1993–2026st50-ln86.7 · 6,886 obs · 1993–2026st55-ln86.7 · 29,914 obs · 1993–2026st60-ln86.7 · 30,524 obs · 1993–2026st70-ln86.7 · 32,005 obs · 1993–2026st80-ln86.7 · 32,284 obs · 1993–2026st90-ln86.7 · 31,681 obs · 1993–2026st100-ln86.7 · 31,545 obs · 1993–2026st110-ln86.7 · 29,744 obs · 1993–2026st32.5-ln86.8 · 1,351 obs · 2004–2026st30.1-ln88.5 · 1,091 obs · 2004–2026st27.7-ln90 · 1,276 obs · 2004–2026st28-ln90 · 7,112 obs · 1993–2026st30-ln90 · 33,547 obs · 1993–2026st35-ln90 · 23,134 obs · 1993–2026st37-ln90 · 33,562 obs · 1993–2026st45-ln90 · 32,951 obs · 1993–2026st53-ln90 · 32,225 obs · 1993–2026st60-ln90 · 34,696 obs · 1993–2026st70-ln90 · 35,378 obs · 1993–2026st80-ln90 · 34,177 obs · 1993–2026st90-ln90 · 49,220 obs · 1993–2026st100-ln90 · 36,382 obs · 1993–2026st110-ln90 · 32,466 obs · 1993–2026st120-ln90 · 33,223 obs · 1993–2026st26.4-ln91.7 · 1,184 obs · 2004–2026st26.7-ln93.3 · 6,604 obs · 1993–2026st28-ln93.3 · 31,723 obs · 1993–2026st30-ln93.3 · 31,576 obs · 1993–2026st35-ln93.3 · 30,934 obs · 1993–2026st40-ln93.3 · 31,412 obs · 1993–2026st45-ln93.3 · 31,672 obs · 1993–2026st50-ln93.3 · 32,100 obs · 1993–2026st55-ln93.3 · 30,409 obs · 1993–2026st60-ln93.3 · 30,973 obs · 1993–2026st70-ln93.3 · 31,596 obs · 1993–2026st80-ln93.3 · 32,903 obs · 1993–2026st90-ln93.3 · 32,773 obs · 1993–2026st100-ln93.3 · 31,969 obs · 1993–2026st110-ln93.3 · 32,441 obs · 1993–2026st120-ln93.3 · 31,533 obs · 1993–2026st26.4-ln93.4 · 1,201 obs · 2003–2026125°W120°W30°N35°N
113 CalCOFI stations sampled, sized by observations, over the survey grid.

What is in it

1993 · 31,995 obs1994 · 65,083 obs1995 · 60,908 obs1996 · 68,146 obs1997 · 65,613 obs1998 · 95,602 obs1999 · 59,843 obs2000 · 58,293 obs2001 · 57,541 obs2002 · 58,242 obs2003 · 71,715 obs2004 · 73,371 obs2005 · 60,649 obs2006 · 66,264 obs2007 · 63,682 obs2008 · 62,751 obs2009 · 70,210 obs2010 · 66,452 obs2011 · 68,994 obs2012 · 55,832 obs2013 · 65,174 obs2014 · 51,737 obs2015 · 61,320 obs2016 · 70,439 obs2017 · 62,976 obs2018 · 54,976 obs2019 · 44,744 obs2020 · 48,036 obs2021 · 51,118 obs2022 · 45,796 obs2023 · 64,766 obs2024 · 52,642 obs2025 · 44,779 obs2026 · 22,062 obs19501960197019801990200020102020
Observations per year, 1993–2026.
16 variables · buoyancy_n2, sigma_theta_ave, spiciness0, mld_temperature_02, mld_sigma_theta_002, chl_max, chl_max_depth, mld_sigma_theta_0125, chl_integrated, chl_integrated_depth … all 16

obs_env profile · one value at each depth of a cast · 2,021,751 values · 1993–2026 · 3 variables

buoyancy_n2 1/s2 651,964sigma_theta_ave kg/m3 684,896spiciness0 kg/m3 684,891

sample_measurement per cast · one value for the whole cast or tow, at no depth · 107,474 values on 9,865 sampling events · 1993–2026 · 13 variables

mld_temperature_02 m 9,638mld_sigma_theta_002 m 9,393chl_max ug/L 9,285chl_max_depth m 9,285mld_sigma_theta_0125 m 9,207chl_integrated mg/m2 9,201chl_integrated_depth m 9,201buoyancy_n2_max 1/s2 8,547pycnocline_depth m 8,547hypoxic_depth_24 m 7,626hypoxic_depth_14 m 7,325hypoxic_depth_05 m 6,159nitracline_depth m 4,060

Every month of the year · extent 29.8–37.8°N, 126.5–117.3°W · 1993-08 to 2026-11

Ways in

Explorerdb-queryOriginal at CalCOFI.orgParquetSTACIngest notebookAs JSON

Every endpoint 23 · explore 4, get the data 3, code 5, metadata records 5, archives & portals 6

Every endpoint this dataset can be reached through, grouped by how you would use it. Each name is the link; the copy button beside it copies the address. Everything is in the release record and was answered when the release was cut.

Apps that read this dataset from the release. The icons after a name are the app’s lenses — the spatial grain it shows the data at.

CalCOFI ExplorerAcross datasetsopens on this dataset
Station ExplorerAcross datasetsopens on this dataset
Hexagon ExplorerAcross datasetsopens on this dataset
Cruise ExplorerAcross datasetsopens on this dataset
Cite CalCOFI, 2026

This dataset's own citation. What to cite, and how, is a chapter of the docs book.

CalCOFI. (2026). CalCOFI CTD Derived Hydrographic Products (from the CalCOFI CTD Cast Files). CalCOFI.io. https://calcofi.io/workflows/ingest_calcofi_ctd-derived.html
BibTeX 
@misc{calcofi_ctd-derived,
  title        = {CalCOFI CTD Derived Hydrographic Products},
  howpublished = {CalCOFI. (2026). CalCOFI CTD Derived Hydrographic Products (from the CalCOFI CTD Cast Files). CalCOFI.io. https://calcofi.io/workflows/ingest_calcofi_ctd-derived.html},
  year         = {2026}
}

…and the release it came from

CalCOFI (2026). CalCOFI Integrated Database, release v2026.11.09 [Data set]. Scripps Institution of Oceanography, NOAA Fisheries, and California Department of Fish and Wildlife. https://calcofi.io/db-schema/?v=v2026.11.09
BibTeX 
@misc{calcofi_release_v2026_11_09,
  title     = {CalCOFI Integrated Database, release v2026.11.09},
  author    = {CalCOFI},
  year      = {2026},
  publisher = {Scripps Institution of Oceanography, NOAA Fisheries, and California Department of Fish and Wildlife},
  url       = {https://calcofi.io/db-schema/?v=v2026.11.09}
}
Provenance source read 2026-11-06 · 3 release tables · 2 changed in v2026.11.09
source accessed
2026-11-06

What changed in v2026.11.09

release changelog ↗

Open questions for the provider 1 on this dataset · 7 open in all
  • Q06 the dataset — proposed

Each is a field the record proposes and the provider has not yet confirmed.

Keywords 6 GCMD

DensityOcean mixed layerChlorophyllOxygenNitratePycnocline

Everything here is open; nothing on calcofi.io asks you to register first. If this dataset ends up in something you build or publish, register your use so it can be credited and linked back; to hear when a release changes it, stay informed. Questions: data@calcofi.io.

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