Seawater pH at Station ALOHA, Hawaii, each cruise

Latest value

8.055pH

Station ALOHA, open North Pacific north of Oahu, Hawaii (22°45′N, 158°00′W); one station, 20 December 2024. Version 2026-01-01.

Notes on individual values

• HOT notes for this cruise: No HOT DIC data; used Keeling DIC (code a). No HOT TA data; used Keeling TA (code b).
• HOT notes for this cruise: No HOT TA data; used Keeling TA (code b).
• HOT notes for this cruise: No TA data; assumed nTA of 2303.2 (code d).
• HOT notes for this cruise: No HOT DIC data; used Keeling DIC (code a).
• HOT notes for this cruise: No DIC data in upper 30 dbar; used value from 34.0 dbar (code e). No TA data in upper 30 dbar; used value from 51.3 dbar (code f).
• HOT notes for this cruise: No HOT DIC data; used Keeling DIC (code a). No HOT TA data; used Keeling TA (code b). Used temp and sal data from downcast before cable broke (code g). No phos data; assumed 0.07 (code h). No sil data; assumed 1.04 (code i). Rosette lost; samples collected with Go-flo bottle on Kevlar line (code j).
• HOT notes for this cruise: No sampling occurred (code k).
• HOT notes for this cruise: No rosette; samples collected with Niskin bottles on Kevlar line (code l).
• HOT notes for this cruise: No phos data; assumed 0.07 (code h).
• HOT notes for this cruise: No DIC or TA data in upper 30 dbar; used values from 34.9 dbar (code m).
• HOT notes for this cruise: No sil data; assumed 1.04 (code i).
• HOT notes for this cruise: No DIC or TA data in upper 30 dbar; used values from 44.9 dbar (code n).
• HOT notes for this cruise: No DIC, TA or pH sampling occurred in upper 200 dbar (code o).
• HOT notes for this cruise: No DIC, TA or pH sampling occurred (code p).
• HOT notes for this cruise: 10-30 dbar averages used due to transient influence of heavy rainfall on 5 dbar sample (code q).

Where it comes from

Producer

Hawaii Ocean Time-series, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa · Hawaii Ocean Time-series surface CO2 system data, Station ALOHA

Version

2026-01-01

File

https://hahana.soest.hawaii.edu/hot/hotco2/HOT_surface_CO2.txt

Fetched

2026-10-05 (automatically), 46,975 bytes

Fingerprint

sha256 4356aa4650188b99f623ac2423e4d5a2af4b189077fd1efd1e2cfd8167161665ETag "b77f-647be0be1fe1b" · Last-Modified Tue, 06 Jan 2026 20:30:28 GMT

Copies

No Wayback copy recorded yet.Our copy of the exact file

Cite the producer

Dore, J.E., R. Lukas, D.W. Sadler, M.J. Church, and D.M. Karl. 2009. Physical and biogeochemical modulation of ocean acidification in the central North Pacific. Proc Natl Acad Sci USA 106:12235-12240.

Producer

Hawaii Ocean Time-series, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa · Hawaii Ocean Time-series surface CO2 system data, Station ALOHA

Version

2026-01-01

File

https://hahana.soest.hawaii.edu/hot/hotco2/HOT_surface_CO2_readme.pdf

Fetched

2026-10-05 (automatically), 573,080 bytes

Fingerprint

sha256 95ebe322ac08c965cc859679cad57bddbe596ebc138ec0381ed787ea9a03ba93ETag "8be98-647be0c50f0bc" · Last-Modified Tue, 06 Jan 2026 20:30:36 GMT

Copies

No Wayback copy recorded yet.Our copy of the exact file

Cite the producer

Dore, J.E., R. Lukas, D.W. Sadler, M.J. Church, and D.M. Karl. 2009. Physical and biogeochemical modulation of ocean acidification in the central North Pacific. Proc Natl Acad Sci USA 106:12235-12240.

What was done to it

1. Read HOT_surface_CO2.txt, last updated 1 January 2026 (the vintage), and checked that its readme of the same date still defines the columns, the -999 missing marker and the notes codes as read here.

   Code: pipeline/src/envdash/transforms/ocean/hot_aloha_co2.py · code sha256 c2648443192ff429… · inputs 4356aa465018… 95ebe322ac08…

2. Published the column pHcalc_insitu (pH calculated from DIC and alkalinity at in situ temperature, total scale) for each of the 355 cruises, 1988-10-31 to 2024-12-20, as printed, dated by the cruise's mid-day (1 October 1988 plus the days column). 9 cruises have -999 and are published as missing.

   Code: pipeline/src/envdash/transforms/ocean/hot_aloha_co2.py · code sha256 c2648443192ff429… · inputs 4356aa465018… 95ebe322ac08…

3. Each cruise's notes codes are carried as a note in the readme's words, except c, r and s, which concern pH samples only. Nothing is averaged or filled.

   Code: pipeline/src/envdash/transforms/ocean/hot_aloha_co2.py · code sha256 c2648443192ff429… · inputs 4356aa465018… 95ebe322ac08…