Bottle phaeopigment
µg/Lkey btl_phaeopigmentNERC P01 PHAEZZXXP06 units UGPLseries btl_phaeopigment
CalCOFI holds 115,558 values of it from 9,276 sampling events in one dataset, 1993–2026, from the surface to 1,122 m. At 10–50 m it has fallen 0.02 per decade since 1993.R Phaeopigment is chlorophyll after something has eaten it or it has died, so the ratio of the two is a reading of how fast the grazers are working through the bloom.C
- 115,558
- values
- 0
- flagged
- 1993–2026
- years
- 1
- dataset
- 1–1,122 m
- depth
- every month
- 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
btl_phaeopigment· source columnphaeono flag at this grain
Explorera depth section vs normaldb-queryERDDAPThis page as JSON R · Python · Parquet
Every way in 8 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.
ExplorerExplorer · a depth section vs normaldb-querySELECT * FROM read_json('…/v2026.11.05/catalog.json')
-- objects[] WHERE table = 'obs_env'
-- AND partition_value = 'btl_phaeopigment'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("btl_phaeopigment"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('btl_phaeopigment')").df()The structure C55H74N4O5 pheophytin a
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 Filter, 90% acetone extraction, benchtop fluorometer (bottle value carried on the CTD cast file)
A known volume filtered onto a GF/F filter, cold-extracted in 90% acetone for 24-48 hours and read on a fluorometer; the extract is then acidified, which strips the magnesium and turns chlorophyll into phaeopigment, and read again (Yentsch & Menzel 1963; Holm-Hansen et al. 1965; Lorenzen 1967). (calcofi.org Bottle sampling methods)
Bottle sampling methods on calcofi.org ↗Why it matters 3 ways to say it · EOV Phytoplankton biomass and diversity
the GOOS specification sheet for this Essential Ocean Variable lists it
other ways to say why · 2
- It is also the reason chlorophyll is read twice, before and after acid: the acid makes the same change in the tube that grazing makes in the sea. needs a citation before it can be the pick
- Wikipedia Pheophytin or phaeophytin is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II in plants, and the type II photosynthetic reaction center found in purple bacteria. In both PS II and RC P870, light drives electrons from the reaction center through pheophytin, which then passes the electrons to a quinone (QA) in RC P870 and RC P680. Pheophytin · CC BY-SA 4.0 · rev. 1373850179
The record’s own history 5 depth bands against the 1993–2013 normal
Each year against the normal i
Deeper than the climatology reaches: 32 values at 500–1000 m, 24 values at 1000–2000 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: 32 values at 500–1000 m, 24 values at 1000–2000 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.
Units and range µg/L · -5 … 100 declared · 0 flagged
µg/L (ug/L in metadata/measurement_type.csv) · P06 units UGPL
details
- bounds
- The registry declares
-5 … 100 µg/Lforbtl_phaeopigment; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- CTD Cast Files
btl_phaeopigment-1.722 · median 0.121 · 12.35 µg/L (5th–95th percentile 0.02–0.64) - flags
- CTD Cast Files
btl_phaeopigmentcarries no quality code at the release grain; qual_ok keeps all 115,558. - 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.
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 1–1,122 m · every month
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 — CTD Cast Files. The Explorer's Share → Cite writes it for the view you make.