Calibrated fluorescence
Fluorescence (calibrated)
µg/Lkey chl_fluorno NERC concept says exactly thisseries chl_fluor
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
- 49,517
- values
- 0
- flagged
- 2010–2022
- years
- 1
- dataset
- surface
- depth
- 9 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
chl_fluor· source columnchl_fluorno 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 v2026.10.21, 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('…/v2026.10.21/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()The structure chlorophyll-a measured fluorometrically’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 fluorometer (calibrated)
Why it matters 6 ways to say it · EOV Phytoplankton biomass and diversity
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
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 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 µg/L · at least -1 declared · 0 flagged
µg/L (ug/L in metadata/measurement_type.csv)
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.
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 · 9 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, v2026.10.21
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.