Underway dissolved oxygen
Dissolved oxygen
key oxygenno NERC concept says exactly thisseries oxygen
CalCOFI holds 9,190 values of it from 9,190 sampling events in one dataset, 2016–2022, at the surface.R Below the mixed layer off Southern California oxygen has fallen since the 1980s and the hypoxic boundary has risen toward the shelf, squeezing the habitat of fish and invertebrates.C
- 9,190
- values
- 0
- flagged
- 2016–2022
- years
- 1
- dataset
- surface
- depth
- 4 of 12
- months
Measured in
1 dataset
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
oxygen· source columnoxygenno flag at this grain no P01 concept
Explorerdb-queryERDDAPThis page as JSON R · Python · Parquet
Every way in 7 ways · ERDDAP · Parquet · R · Python · JSON
Read from measurements.json of release v2026.11.05, 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.
Explorerdb-querySELECT * FROM read_json('…/v2026.11.05/catalog.json')
-- objects[] WHERE table = 'obs_env'
-- AND partition_value = 'oxygen'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("oxygen"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('oxygen')").df()The structure dissolved oxygen (µmol/kg)’s, standing in
RDKit 2026.03.6 from the ChEBI molfile, in the page’s ink · CC BY 4.0. ChEBI’s roles are never shown.
How it is measured underway, on the mast
Why it matters 7 ways to say it · EOV Oxygen
the GOOS specification sheet for this Essential Ocean Variable lists it, and asks
GOOS asks
- How large are the ocean’s “dead zones” and how fast are they changing?
- Is the biomass of the ocean changing?
GOOS specification sheet ↗ · quoted, not copied
other ways to say why · 6
- Oxygen is the balance of what the ocean takes in at the surface and what animals and bacteria use below; a warmer ocean holds less and mixes less, so it is losing oxygen. needs a citation before it can be the pick
- Warming thins the oxygen the surface layer can hold, and the upper ocean has been losing it for decades across the North Pacific, not only here. needs a citation before it can be the pick
- GOOS asks How large are the ocean’s “dead zones” and how fast are they changing? source
- GOOS asks Is the biomass of the ocean changing? source
- Wikipedia Hypoxia (environmental) source
- Wikipedia Ocean deoxygenation is the reduction of the oxygen content in different parts of the ocean due to human activities. There are two areas where this occurs. Ocean deoxygenation · CC BY-SA 4.0 · rev. 1354922617
The record’s own history no climatology to depart from
Each year against the normal i
i
The release builds no climatology for this measurement, so there is no normal to draw a departure from.
Units and range 0 … 20 declared · 0 flagged
No unit in the registry.
details
- bounds
- The registry declares
0 … 20foroxygen; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- Underway Meteorological (METS)
oxygen4.646 · median 5.634 · 12.24 (5th–95th percentile 5.089–8.264) - flags
- Underway Meteorological (METS)
oxygencarries no quality code at the release grain; qual_ok keeps all 9,190. - baseline
- No climatology row is built for this measurement, so the Explorer draws values, not anomalies.
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.
By depth · by month surface · 4 of 12 months
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.
Cite the release, v2026.11.05
Cite the release; each dataset's own citation, licence and DOI are on its page — Underway Meteorological (METS). The Explorer's Share → Cite writes it for the view you make.