CTD temperature (ITS-90 scale)
- 4,009
- values
- 0
- flagged
- 3,481
- sampling events
- 1983–2021
- years
- 1
- dataset
- 0–3,542 m
- depth
- every month
- seasons
This is the preferred term for this definition. Alternative term TEMPST02 is included to cover cases where there are two sensors of the same type contributing to the data set and referential integrity considerations prevent a usage of a single code.
Sea-Bird CTD temperature sensor (ITS-90 scale, carried on the DIC sample record)
CTD FAQ circa 2020 on calcofi.org ↗EOV Subsurface temperature
CalCOFI holds 4,009 values of it from 3,481 sampling events in one dataset, 1983–2021, from the surface to 3,542 m. At 10–50 m it has fallen 0.14 per decade since 1984.R Temperature sets the water’s density, and so the layering that decides whether deep nutrients reach the sunlit surface; off California the warm years are El Niño years and marine heatwaves.C
other ways to say why · 3
- A warm year off California is usually a lean one: warmer, more layered water brings fewer nutrients up, and the plankton the rest of the food web eats decline. needs a citation before it can be the pick
- Wikipedia Marine heatwave source
- Wikipedia Sea surface temperature is the temperature of ocean water close to the surface. The exact meaning of surface varies in the literature and in practice. Sea surface temperature · CC BY-SA 4.0 · rev. 1374459881
The measurement
Measured in i
One row per series, one cell per year, darker with more values — the same strip the front
door draws per dataset and a species page draws per taxon. Each row is one dataset's own
measurement_type; the label is written once, in the title above.
i
One row per series, one cell per year, darker with more values — the same strip the front door draws per dataset and a species page draws per taxon. Each row is one dataset's own measurement_type; the label is written once, in the title above.
-
series
ctdtemp_its90· source columnCTDTEMP_ITS90· flag columnctdtemp_its90_flag
How it is measured
The CTD temperature at the time and depth of the DIC/alkalinity bottle draw, on the ITS-90 scale. (calcofi.org CTD FAQ circa 2020)
CTD FAQ circa 2020 on calcofi.org ↗Why it matters
The familiar scale i
Bars are each series' 5th–95th percentile, the line its minimum to maximum, the ring its median;
the marks are metadata/measurement_scale.csv's, each hovering to its own source.
i
Bars are each series' 5th–95th percentile, the line its minimum to maximum, the ring its median;
the marks are metadata/measurement_scale.csv's, each hovering to its own source.
The record’s own history i
Deeper than the climatology reaches: 732 values at 0–10 m, 402 values at 50–100 m, 722 values at 100–200 m, 725 values at 200–500 m, 399 values at 500–1000 m, 1 values at 1000–2000 m, 16 values at 2000+ m have no
normal to depart from, because the release’s climatology stops at its
deepest built bin. Carrying it to the bottom is one argument of
build_climatology() and puts these bands on the page too.
i
Deeper than the climatology reaches: 732 values at 0–10 m, 402 values at 50–100 m, 722 values at 100–200 m, 725 values at 200–500 m, 399 values at 500–1000 m, 1 values at 1000–2000 m, 16 values at 2000+ m have no
normal to depart from, because the release’s climatology stops at its
deepest built bin. Carrying it to the bottom is one argument of
build_climatology() and puts these bands on the page too.
the GOOS specification sheet for this Essential Ocean Variable lists it
The record
Ways in i
Read from measurements.json of release
v2026.10.14, written at release by
calcofi4db::build_measurements_catalog() beside
taxa.json. The catalog's index is
/measurements/; the JSON-LD on this page is a
schema.org/DefinedTerm in the NERC P01 term set with a
PropertyValue per series.
ExplorerExplorer · a depth section vs normaldb-queryi
Read from measurements.json of release v2026.10.14, written at release by calcofi4db::build_measurements_catalog() beside taxa.json. The catalog's index is /measurements/; the JSON-LD on this page is a schema.org/DefinedTerm in the NERC P01 term set with a PropertyValue per series.
SELECT * FROM read_json('…/v2026.10.14/catalog.json')
-- objects[] WHERE table = 'obs_env'
-- AND partition_value = 'ctdtemp_its90'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("ctdtemp_its90"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('ctdtemp_its90')").df()By depth i
Values per depth band at the release grain, one thin bar per series. The bands are the
record's own (0-10 … 2000+ m).
i
Values per depth band at the release grain, one thin bar per series. The bands are the record's own (0-10 … 2000+ m).
By month i
Values per calendar month, one row per series: CalCOFI's quarterly cruises show as peaks in
the months the ships sail.
i
Values per calendar month, one row per series: CalCOFI's quarterly cruises show as peaks in the months the ships sail.
Range & quality
details
- bounds
- The registry declares
-2 … 40 °Cforctdtemp_its90; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- Carbonate Chemistry / DIC
ctdtemp_its901.52 · median 11.43 · 23.56 °C (5th–95th percentile 6.13–18.77) - flags
- Carbonate Chemistry / DIC
ctdtemp_its90ctdtemp_its90_flagon 4,009 of 4,009 rows:24,009; qual_ok keeps 4,009. The codes are this dataset's own vocabulary, uninterpreted. - baseline
- A monthly climatology exists for this measurement (the release's climatology table: 1993–2013, dataset × station × the cruise's month × 10 m bin), so the Explorer can draw anomalies against it rather than values.
Cite
Cite the release; each dataset's own citation, licence and DOI are on its page — Carbonate Chemistry / DIC. The Explorer's Share → Cite writes it for the view you make.