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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 1,364,381 observations from 9,534 sampling events at 113 stations, 1993–2026, 1–3,630 m.

1993–2026
years
1,364,381
observations
9,534
sampling events
113
stations
9
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 and the chlorophyll-a integrated over the top 200 m, 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 · 684 obs · 2003–2025st60-ln60 · 3,320 obs · 2003–2025st70-ln60 · 3,426 obs · 2003–2025st80-ln60 · 2,834 obs · 2003–2025st90-ln60 · 1,862 obs · 2003–2025st100-ln60 · 142 obs · 2003–2003st52-ln63.3 · 612 obs · 2003–2025st55-ln63.3 · 1,434 obs · 2003–2025st60-ln63.3 · 2,192 obs · 2003–2025st70-ln63.3 · 2,574 obs · 2003–2025st80-ln63.3 · 2,798 obs · 2003–2025st90-ln63.3 · 2,198 obs · 2003–2025st100-ln63.3 · 128 obs · 2003–2003st50-ln66.7 · 4,154 obs · 1998–2025st55-ln66.7 · 5,592 obs · 1998–2025st60-ln66.7 · 5,110 obs · 1998–2025st65-ln66.7 · 2,652 obs · 1998–2011st70-ln66.7 · 5,216 obs · 1998–2025st75-ln66.7 · 2,682 obs · 2004–2011st80-ln66.7 · 5,226 obs · 1998–2025st85-ln66.7 · 2,362 obs · 2004–2011st90-ln66.7 · 3,608 obs · 2003–2025st95-ln66.7 · 290 obs · 2007–2007st100-ln66.7 · 406 obs · 2003–2007st51-ln70 · 1,802 obs · 1998–2025st55-ln70 · 3,352 obs · 1998–2025st60-ln70 · 4,408 obs · 1998–2025st70-ln70 · 4,372 obs · 1995–2025st80-ln70 · 3,414 obs · 1998–2025st90-ln70 · 2,900 obs · 2003–2025st100-ln70 · 150 obs · 2003–2003st50-ln73.3 · 1,008 obs · 1997–2025st55-ln73.3 · 3,146 obs · 1998–2025st60-ln73.3 · 2,968 obs · 1998–2025st70-ln73.3 · 3,268 obs · 1998–2025st80-ln73.3 · 3,050 obs · 1998–2025st90-ln73.3 · 2,692 obs · 2003–2025st100-ln73.3 · 474 obs · 2003–2004st49-ln76.7 · 3,240 obs · 1993–2026st51-ln76.7 · 9,570 obs · 1993–2026st55-ln76.7 · 18,868 obs · 1993–2026st60-ln76.7 · 19,480 obs · 1993–2026st70-ln76.7 · 20,454 obs · 1993–2026st80-ln76.7 · 20,242 obs · 1993–2026st90-ln76.7 · 21,120 obs · 1993–2026st100-ln76.7 · 19,300 obs · 1993–2025st50.5-ln80 · 826 obs · 2004–2026st51-ln80 · 4,198 obs · 1993–2026st55-ln80 · 20,332 obs · 1993–2026st60-ln80 · 21,688 obs · 1993–2026st70-ln80 · 20,812 obs · 1993–2026st80-ln80 · 21,676 obs · 1993–2026st90-ln80 · 25,055 obs · 1993–2026st100-ln80 · 22,318 obs · 1993–2026st43.5-ln81.7 · 880 obs · 2004–2026st46.9-ln81.8 · 21,558 obs · 1993–2026st39.4-ln83.3 · 704 obs · 1998–2026st40.6-ln83.3 · 2,560 obs · 1993–2026st42-ln83.3 · 7,930 obs · 1993–2026st51-ln83.3 · 6,327 obs · 1993–2026st55-ln83.3 · 20,916 obs · 1993–2026st60-ln83.3 · 21,712 obs · 1993–2026st70-ln83.3 · 21,994 obs · 1993–2025st80-ln83.3 · 21,648 obs · 1993–2025st90-ln83.3 · 21,496 obs · 1993–2026st100-ln83.3 · 21,260 obs · 1993–2026st110-ln83.3 · 19,520 obs · 1993–2026st35.8-ln85.4 · 792 obs · 2004–2026st33-ln86.7 · 3,772 obs · 1993–2026st35-ln86.7 · 20,288 obs · 1993–2026st40-ln86.7 · 23,896 obs · 1993–2026st45-ln86.7 · 19,822 obs · 1993–2026st50-ln86.7 · 4,890 obs · 1993–2026st55-ln86.7 · 20,030 obs · 1993–2026st60-ln86.7 · 20,438 obs · 1993–2026st70-ln86.7 · 21,414 obs · 1993–2026st80-ln86.7 · 21,612 obs · 1993–2026st90-ln86.7 · 21,212 obs · 1993–2026st100-ln86.7 · 21,105 obs · 1993–2026st110-ln86.7 · 20,093 obs · 1993–2026st32.5-ln86.8 · 1,100 obs · 2004–2026st30.1-ln88.5 · 945 obs · 2004–2026st27.7-ln90 · 1,064 obs · 2004–2026st28-ln90 · 5,071 obs · 1993–2026st30-ln90 · 22,464 obs · 1993–2026st35-ln90 · 15,534 obs · 1993–2026st37-ln90 · 22,478 obs · 1993–2026st45-ln90 · 22,078 obs · 1993–2026st53-ln90 · 21,570 obs · 1993–2026st60-ln90 · 23,240 obs · 1993–2026st70-ln90 · 23,710 obs · 1993–2026st80-ln90 · 22,904 obs · 1993–2026st90-ln90 · 32,934 obs · 1993–2026st100-ln90 · 24,352 obs · 1993–2026st110-ln90 · 21,724 obs · 1993–2026st120-ln90 · 22,258 obs · 1993–2026st26.4-ln91.7 · 1,012 obs · 2004–2026st26.7-ln93.3 · 4,734 obs · 1993–2026st28-ln93.3 · 21,224 obs · 1993–2026st30-ln93.3 · 21,110 obs · 1993–2026st35-ln93.3 · 20,708 obs · 1993–2026st40-ln93.3 · 21,002 obs · 1993–2026st45-ln93.3 · 21,192 obs · 1993–2026st50-ln93.3 · 21,512 obs · 1993–2026st55-ln93.3 · 20,544 obs · 1993–2026st60-ln93.3 · 20,926 obs · 1993–2026st70-ln93.3 · 21,336 obs · 1993–2026st80-ln93.3 · 22,214 obs · 1993–2026st90-ln93.3 · 22,118 obs · 1993–2026st100-ln93.3 · 21,574 obs · 1993–2026st110-ln93.3 · 21,895 obs · 1993–2026st120-ln93.3 · 21,282 obs · 1993–2026st26.4-ln93.4 · 1,018 obs · 2003–2026125°W120°W30°N35°N
113 CalCOFI stations sampled, sized by observations, over the survey grid.

What is in it

1993 · 21,620 obs1994 · 43,969 obs1995 · 41,219 obs1996 · 46,164 obs1997 · 44,398 obs1998 · 64,705 obs1999 · 40,488 obs2000 · 39,446 obs2001 · 38,952 obs2002 · 39,420 obs2003 · 48,514 obs2004 · 49,664 obs2005 · 41,146 obs2006 · 44,984 obs2007 · 43,210 obs2008 · 42,530 obs2009 · 47,526 obs2010 · 44,968 obs2011 · 46,698 obs2012 · 37,852 obs2013 · 44,186 obs2014 · 35,074 obs2015 · 41,582 obs2016 · 47,774 obs2017 · 42,728 obs2018 · 37,304 obs2019 · 30,354 obs2020 · 32,612 obs2021 · 34,704 obs2022 · 31,062 obs2023 · 43,928 obs2024 · 35,720 obs2025 · 30,344 obs2026 · 9,536 obs19501960197019801990200020102020
Observations per year, 1993–2026.
9 variables · 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 units and counts

obs_env profile · one value at each depth of a cast · 1,364,381 values · 1993–2026 · 2 variables

sigma_theta_ave kg/m3 682,193spiciness0 kg/m3 682,188

sample_measurement per cast · one value for the whole cast or tow, at no depth · 64,994 values on 9,826 sampling events · 1993–2026 · 7 variables

mld_temperature_02 m 9,605mld_sigma_theta_002 m 9,360chl_max ug/L 9,255chl_max_depth m 9,255mld_sigma_theta_0125 m 9,177chl_integrated mg/m2 9,171chl_integrated_depth m 9,171

Every month of the year · extent 29.8–37.8°N, 126.5–117.3°W · 1993-08 to 2026-07

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.

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CalCOFI ExplorerAcross datasetsopens on this dataset
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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 v2026.10.21 [Data set]. Scripps Institution of Oceanography, NOAA Fisheries, and California Department of Fish and Wildlife. https://calcofi.io/db-schema/?v=v2026.10.21
BibTeX 
@misc{calcofi_release_v2026_10_21,
  title     = {CalCOFI Integrated Database, release v2026.10.21},
  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=v2026.10.21}
}
Provenance source read 2026-10-21 · 3 release tables · 2 changed in v2026.10.21
source accessed
2026-10-21

What changed in v2026.10.21

release changelog ↗

Open questions for the provider 1 on this dataset · 5 open in all
  • Q06 the dataset — proposed

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

Keywords 3 GCMD

DensityOcean mixed layerChlorophyll

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