Total alkalinity replicate 1
- 2,084
- values
- 0
- flagged
- 317
- sampling events
- 2008–2015
- years
- 1
- dataset
- 1–3,542 m
- depth
- Jan · Feb · Mar · Apr · May · Jul · Aug · Oct · Nov
- seasons
CO₂(aq) · HCO₃⁻ · CO₃²⁻
Concentration (moles or mass) of acid-neutralising bases per unit mass of the water column.
Drawn from the rosette, analysed ashore
NCEI accession 0301029 (DIC/alkalinity instruments); Bottle sampling methods on calcofi.org ↗How is the ocean carbon content changing?
CalCOFI holds 2,084 values of it from 317 sampling events in one dataset, 2008–2015, from the surface to 3,542 m.R Alkalinity is the water’s buffer: with dissolved inorganic carbon it fixes pH and how much carbonate is left for shells, which is what decides whether upwelled water is corrosive.C
other ways to say why · 3
- Neither alkalinity nor DIC says much alone; the carbonate system is read from the pair. needs a citation before it can be the pick
- GOOS asks How is the ocean carbon content changing? source
- Wikipedia Alkalinity (from Arabic: القلوية, romanized: al-qaly, lit. 'ashes of the saltwort') is the capacity of water to resist acidification. Alkalinity · CC BY-SA 4.0 · rev. 1377364008
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
alkalinity_rep1· source columnta1replicate no flag at this grain
The structure
ChEBI: “A one-carbon compound with formula CO2 in which the carbon is attached to each oxygen atom by a double bond. A colourless, odourless gas under normal conditions, it is produced during respiration by all animals, fungi and microorganisms that depend directly or indirectly on living or decaying plants for food.” · RDKit 2026.03.6 from the ChEBI SMILES (the molfile is vertical), in the page’s ink · CC BY 4.0. ChEBI’s roles are never shown.
How it is measured
Samples drawn from the Niskins at selected stations and analysed ashore; total inorganic carbon and alkalinity are measured, from which pH and pCO2 can be calculated, calibrated to the certified reference materials Scripps prepares for the world. (NCEI accession 0301029 (DIC/alkalinity instruments); calcofi.org Bottle sampling methods)
NCEI accession 0301029 (DIC/alkalinity instruments); 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
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
- How is the ocean carbon content changing?
GOOS specification sheet ↗ · quoted, not copied
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 = 'alkalinity_rep1'library(calcofi4r)
con <- cc_get_db() # the promoted release
tbl(con, "obs_env") |> filter(measurement_type %in% c("alkalinity_rep1"))import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_env WHERE measurement_type IN ('alkalinity_rep1')").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 … 5000 µmol/kgforalkalinity_rep1; a value outside it is dropped at the ingest (drop_out_of_bounds()). - observed
- Hydrographic Bottle
alkalinity_rep12182 · median 2244 · 2435 µmol/kg (5th–95th percentile 2217–2317) - flags
- Hydrographic Bottle
alkalinity_rep1carries no quality code at the release grain; qual_ok keeps all 2,084. - 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.
Related measurements i
The same quantity from another platform or another kind of sample, each its own page and
never merged into this one: a dataset's own bottle samples would count that dataset twice, an underway intake
is not a cast, and a replicate is not a mean. The reason is the record's
(related[].why).
i
The same quantity from another platform or another kind of sample, each its own page and never merged into this one: a dataset's own bottle samples would count that dataset twice, an underway intake is not a cast, and a replicate is not a mean. The reason is the record's (related[].why).
- Total alkalinity alkalinity · Carbonate Chemistry / DIC · 1984–2021 · 4,063 values · P01 MDMAP014 a replicate of the source's repeated analyses beside a reported mean; the providers have been asked which to publish
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.