Fluorescence (calibrated)
- 49,517
- values
- 0
- flagged
- 49,517
- sampling events
- 2010–2022
- years
- 1
- dataset
- surface
- depth
- Jan · Feb · Mar · Apr · May · Jul · Aug · Oct · Nov
- seasons
stands in: chlorophyll-a measured fluorometrically’s face, calibrated underway fluorescence
No definition of its own: the estimate is described by its derivation, under How.
Is the biomass of the ocean changing?
CalCOFI holds 49,517 values of it from 49,517 sampling events in one dataset, 2010–2022, at the surface.R Every phytoplankter carries chlorophyll-a, so it is the standard measure of how much plant life the sunlit layer holds: the base of the food web the rest of the survey counts.C
other ways to say why · 5
- The fluorometer reads a profile continuously where the bottles read a handful of depths, so it is what shows the shape of the chlorophyll maximum. needs a citation before it can be the pick
- Chlorophyll is what satellites see as ocean colour, and bottle chlorophyll like CalCOFI’s is among the ground truth their algorithms were fitted to. needs a citation before it can be the pick
- GOOS asks Is the biomass of the ocean changing? source
- Wikipedia Phytoplankton source
- Wikipedia Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light. Chlorophyll a · CC BY-SA 4.0 · rev. 1373717553
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
chl_fluor· source columnchl_fluorno flag at this grain no P01 concept
The structure
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
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
i
The release builds no climatology for this measurement, so there is no normal to draw a departure from.
the GOOS specification sheet for this Essential Ocean Variable lists it, and asks
GOOS asks
- Is the biomass of the ocean changing?
GOOS specification sheet ↗ · quoted, not copied
The record
Ways in i
Read from measurements.json of release
v2026.10.05, 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-queryi
Read from measurements.json of release v2026.10.05, 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.
SELECT * FROM read_json('…/v2026.10.05/catalog.json')
-- objects[] WHERE table = 'obs_env'
-- AND partition_value = 'chl_fluor'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("chl_fluor"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('chl_fluor')").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
at least -1 µg/Lforchl_fluor; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- Underway Meteorological (METS)
chl_fluor-0.112 · median 0.4795 · 41.27 µg/L (5th–95th percentile 0.01195–4.771) - flags
- Underway Meteorological (METS)
chl_fluorcarries no quality code at the release grain; qual_ok keeps all 49,517. - baseline
- No climatology row is built for this measurement, so the Explorer draws values, not anomalies.
Cite
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.