Dissolved inorganic carbon, total alkalinity, pH on total scale, water temperature, salinity, dissolved oxygen, and other parameters obtained during the R/V Alpha Hélix cruise LM1506 (EXPOCODE 31HX20150603) in the North Pacific Ocean, Gulf of California from 2015-06-03 to 2015-06-16 (NCEI Accession 0309426)

Description

This data set consists of dissolved inorganic carbon, total alkalinity, pH on total scale, water temperature, salinity, dissolved oxygen, and other parameters obtained during the R/V Alpha Hélix cruise LM1506 (EXPOCODE 31HX20150603) in the North Pacific Ocean, Gulf of California from 2015-06-03 to 2015-06-16. As a result of anthropogenic activities, it has been predicted that the ocean will be challenged with rising temperature, increased stratification, ocean acidification, stronger more frequent tropical storms, and oxygen depletion. In the tropical Pacific off central Mexico all these phenomena are already occurring naturally, providing a laboratory from which to explore ocean biogeochemical dynamics that are predicted under future anthropogenic forcing conditions. Here, seasonally anomalous surface tropical waters were detected as a result of the developing “Godzilla El Niño 2015–2016.” The incursion of this oxygenated water modified the local structure of an intense and shallow oxygen minimum zone (OMZ), partially eroding and intensifying the oxycline while having an associated impact on the carbon maximum zone. The core of the OMZ (<4.4 μmol kg–1) was centered around 474 m, with a variant upper level between 50 and 360 m depth. Below the dominance of Tropical Surface Waters, the thickness of the oxycline varied between 10 and 325 m, with intensity values up to 11 μmol kg–1 m–1. The change in dissolved inorganic carbon (DIC) and apparent oxygen utilization yielded a molar ratio of δDIC = 0.98 × δAOU during June 2015 and of δDIC = 1.08 × δAOU for March 2016. A further decrease in the average content of DIC was observed in the carbon maximum zone for 2016. Traditionally, different explanations have been proposed to account for changing oxygen concentrations in the ocean rather than considering the interactions between multiple forcing factors. Our results highlight the significance of an episodic event like El Niño in the distribution and concentration of O2 and DIC and as a plausible mechanism of ventilation and increased oxygen availability in the upper OMZ of the tropical Pacific off central Mexico.

Resources

Name Format Description Link
21 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0309426.html
0 Navigate directly to the URL for a descriptive web page with download links. https://doi.org/10.25921/8s4x-p765
0 Navigate directly to the URL for a descriptive web page with download links. https://www.ncei.noaa.gov/archive/accession/oas/309426
0 Navigate directly to the URL for data access and direct download. https://www.ncei.noaa.gov/archive/accession/download/309426
0 These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP). ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0242/0309426/
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Information for contacts at NCEI. https://www.ncei.noaa.gov/contact
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
0 OCADS website https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
21 Related data https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0309427.html
21 Related data https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307455.html
0 related resource https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/

Tags

  • gulf of california
  • ctdsal_pss78
  • north pacific ocean
  • ph_ts_measured
  • ta
  • profile
  • oceanography
  • coastal
  • ctdoxy
  • 31hx20150603
  • lm1506
  • ctdtemp_its90
  • dic
  • ocean carbon and acidification data system (ocads) project

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