Table of Contents

• Coverage
• Dataset Description
  • Methods & Sampling
  • Data Processing Description
• Data Files
• Supplemental Files
• Related Publications
• Parameters
• Instruments
• Deployments
• Project Information
• Program Information
• Funding

Methodology:
The methods used in all were based on simulated in situ incubations and productivity measured by uptake of radiocarbon. Methodology for all is largely the same, with some slight variations in the irradiance levels for incubation. Incubations lasted for 24 h and 7 depths per station were measured. A total of 449 stations are compiled that were sampled from 1983 to 2006. Details of the methodology are described in Smith et al. (2000). Any inconsistencies found within the 449 stations should be reported to the PI for correction. Additional details on data compilation are in the attached README file (PDF).

Sampling and Analytical Procedures:
Samples were obtained from CTD casts with attached Niskins on the rosette. Irradiance was determined largely using an in situ PAR sensor, but earlier cruises also used a Secchi disk. Samples had ca. 100 µCi ¹⁴C-bicarbonate added and placed in on-deck incubators flushed with flowing seawater. Most incubations lasted 24 h after which samples were filtered onto 25 mm GFF filters, rinsed with 5 mL 0.01N HCL in filtered seawater, placed in scintillation vials, and had ca. 7 mL scintillation cocktail added. Total activity added to each bottle was assessed by counting an unfiltered sample (100 µL) directly in LS cocktail. All samples were counted using a liquid scintillation counter after 24 h in darkness, and DPMs converted to absolute carbon units using known equations (Smith et al., 1977).

Chlorophyll was determined fluorometrically using standard JGOFS procedures. Samples were collected from known depths into amber polycarbonate bottles, known volumes filtered through 25 mm GFF filters under low vacuum, extracted for 24 h in 90% acetone in dark, cold conditions, and the fluorescence read before and after acidification.

Mixed layers were determined from the vertical profiles of density (sigma-t) determined from CTD profiles. A change of 0.01 kg m⁻³ from a stable surface layer reading was defined as the base of the mixed layer (Smith et al., 2013).

Integrated primary productivity and chlorophyll concentrations were determined using trapezoidal integrations through the 0.1 and 1.0% isolumes, respectively. Photosynthetically active radiation (PAR) were collected using a BioSpherical Sensor Model QSP-240 placed as close to the incubators as possible. All data were integrated from 1-minute values over the period of incubation. The integrated data by station are provided in the attached Supplemental File "Integrated Water Column Station Data" (.csv file).

Data Processing:
No specific data processing procedures were used in the generation of the productivity rates; all are simply compiled and analyzed on routine numerical packages.

BCO-DMO Processing:
- replaced "---" and "-999" with "nd" ("no data");
- renamed fields to comply with BCO-DMO naming conventions;
- changed date format to YYYY-MM-DD;
- replaced `66.`05 with 166.105 in the Longitude column;
- removed spaces from "NBP" cruise IDs for naming consistency;
- 2021-12-01: updated the Integrated Station Data and README Supplemental Files. The v2 Integrated Station Data includes a column for Integrated_PAR, which was not in the previous version.

This compilation was funded by NSF in ca. 10 independent projects, and pulling all the data together was not directly part of any single NSF project. The value of the database is that these measurements are from a restricted area, cover nearly 25 years, and use a consistent methodology.

The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.

The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).