Light intensity of incubation tubes
- 19,767
- values
- 0
- flagged
- 1,902
- sampling events
- 1984–2020
- years
- 1
- dataset
- 0–211 m
- depth
- Jan · Feb · Mar · Apr · May · Jun · Jul · Aug · Sep · Oct · Nov
- seasons
Neutral-density screens on the on-deck incubators
Bottle sampling methods on calcofi.org ↗CalCOFI holds 19,767 values of it from 1,902 sampling events in one dataset, 1984–2020, from the surface to 211 m. At 10–50 m it has fallen 10.06 per decade since 1984.R Light is the other half of photosynthesis: how deep it reaches sets the bottom of the layer where anything can grow, and the water’s own plankton is what dims it.C
other ways to say why · 4
- Each incubation tube is screened to a share of full sun, so the set of them reads the growth the water would manage at a set of depths. needs a citation before it can be the pick
- Surface light and light at depth are measured together so a cast can be read as a fraction of that day’s sun rather than an absolute. needs a citation before it can be the pick
- Wikipedia Photic zone source
- Wikipedia Photosynthetically active radiation (PAR) designates the spectral range of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photosynthetically active radiation · CC BY-SA 4.0 · rev. 1372897979
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
light_pct· source columnlight_pno flag at this grain no P01 concept
How it is measured
The incubation tubes' light level is set to a percentage of surface irradiance, chosen from the Secchi-depth estimate of the 1% light level. (calcofi.org Bottle sampling methods)
Bottle sampling methods 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: 4 values at 200–500 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: 4 values at 200–500 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 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 = 'light_pct'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("light_pct"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('light_pct')").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
0 … 100 %forlight_pct; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- Hydrographic Bottle
light_pct0 · median 1.4 · 99.9 % (5th–95th percentile 0.007–95) - flags
- Hydrographic Bottle
light_pctcarries no quality code at the release grain; qual_ok keeps all 19,767. - 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 — Hydrographic Bottle. The Explorer's Share → Cite writes it for the view you make.