gov.noaa.nodc:0309426 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2026-03-26T08:51:55Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) 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) 2025-11-15 publication 2025-12-02 revision 2025-11-11 creation International DOI Foundation (IDF) 10.25921/8s4x-p765 NOAA National Centers for Environmental Information gov.noaa.nodc:0309426 NCEI Archive Management System 0309426 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Luz de Lourdes Aurora Coronado Álvarez Autonomous University of Baja California luz.coronado@uabc.edu.mx resourceProvider Autonomous University of Baja California resourceProvider J. Martín Hernández-Ayón Autonomous University of Baja California principalInvestigator Pablo N. Trucco-Pignata Autonomous University of Baja California principalInvestigator Eduardo Santamaria-del-Angel Autonomous University of Baja California principalInvestigator Emilio Beier Autonomous University of Baja California principalInvestigator Laura Sánchez-Velasco Autonomous University of Baja California principalInvestigator Victor M. Godínez Autonomous University of Baja California principalInvestigator Luz de Lourdes Aurora Coronado Álvarez Autonomous University of Baja California luz.coronado@uabc.edu.mx principalInvestigator Trucco-Pignata, Pablo N. Autonomous University of Baja California author Hernández-Ayón, J. Martín Autonomous University of Baja California author Santamaria-del-Angel, Eduardo Autonomous University of Baja California author Beier, Emilio Autonomous University of Baja California author Sánchez-Velasco, Laura Autonomous University of Baja California author Godínez, Victor M. Autonomous University of Baja California author Álvarez, Luz de Lourdes Aurora Coronado Autonomous University of Baja California author Autonomous University of Baja California contributor tableDigital 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. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: Identify changes in thermohaline and carbonate system variables in the Gulf of California, in the great islands region. completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded NCEI Accession 0309426 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. Please see journal.txt in the /about directory for additional details on changes made. https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0309426 Preview graphic PNG 0309426 NCEI ACCESSION NUMBER 2025-11-07 publication DISSOLVED INORGANIC CARBON (DIC) DISSOLVED OXYGEN pH SALINITY total alkalinity WATER TEMPERATURE theme NODC DATA TYPES THESAURUS carbon dioxide (CO2) gas analyzer CTD Niskin bottle oxygen sensor pH sensor salinometer temperature sensor titrator instrument NODC INSTRUMENT TYPES THESAURUS chemical discrete sample physical profile theme NODC OBSERVATION TYPES THESAURUS RV Alpha Helix platform NODC PLATFORM NAMES THESAURUS Autonomous University of Baja California dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS Autonomous University of Baja California dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Ocean Carbon and Acidification Data System (OCADS) project NODC PROJECT NAMES THESAURUS Gulf of California North Pacific Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication LM1506 project Cruise ID 31HX20150603 project EXPOCODE Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords Coastal project Reference Section ID EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian Profile theme OCADS Study Type CTDOXY CTDSAL_PSS78 CTDTEMP_ITS90 DIC TA pH_TS_measured theme Provider Variable Abbreviations CO2 ANALYZERS > CO2 ANALYZERS CTD > Conductivity, Temperature, Depth NISKIN BOTTLES OXYGEN METERS > OXYGEN METERS PH METERS > PH METERS SALINOMETERS TEMPERATURE SENSORS > TEMPERATURE SENSORS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian Ships platform Global Change Master Directory (GCMD) Platform Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian ALPHA HELIX (call sign: WSD7078, ICES code: 31HX, 1966-) platform ICES/SeaDataNet Ship Codes OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN place Global Change Master Directory (GCMD) Location Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian Gulf of California North Pacific Ocean place Provider Geographic Names accessLevel: public otherRestrictions Cite as: Trucco-Pignata, Pablo N.; Hernández-Ayón, J. Martín; Santamaria-del-Angel, Eduardo; Beier, Emilio; Sánchez-Velasco, Laura; Godínez, Victor M.; Álvarez, Luz de Lourdes Aurora Coronado (2025). 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). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/8s4x-p765. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. license These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). SPDX License: Creative Commons Zero v1.0 Universal (CC0-1.0) NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system 2022-04 publication https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system HTTPS https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system OCADS website information NOAA National Centers for Environmental Information author NOAA National Centers for Environmental Information (NCEI) publisher documentDigital [accessed 2024-02-08] crossReference program Trucco-Pignata, Pablo N.; Hernández-Ayón, J. Martín; Santamaria-del-Angel, Eduardo; Beier, Emilio; Sánchez-Velasco, Laura; Godínez, Victor M.; Álvarez, Luz de Lourdes Aurora Coronado (2025). 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 31HX20160302) in the North Pacific Ocean, Gulf of California from 2016-03-02 to 2016-03-08 (NCEI Accession 0309427). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/vmcb-p243. 2025-11-15 publication International DOI Foundation (IDF) https://doi.org/10.25921/vmcb-p243 NOAA National Centers for Environmental Information gov.noaa.nodc:0309427 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0309427.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0309427.html Related dataset information Trucco-Pignata, Pablo N. Autonomous University of Baja California author Hernández-Ayón, J. Martín Autonomous University of Baja California author Santamaria-del-Angel, Eduardo Autonomous University of Baja California author Beier, Emilio Autonomous University of Baja California author Sánchez-Velasco, Laura Autonomous University of Baja California author Godínez, Victor M. Autonomous University of Baja California author Álvarez, Luz de Lourdes Aurora Coronado Autonomous University of Baja California author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project Hernández-Ayón, J. Martín; Chapa-Balcorta, Cecilia; Delgadillo-Hinojosa, Francisco; Camacho-Ibar, Victor; Huerta-Díaz, Miguel Ángel; Santamaria-del-Angel, Eduardo; Galindo-Bect, Salvador; Segovia-Zavala, José Antonio; Álvarez, Luz de Lourdes Aurora Coronado (2025). Dynamics of dissolved inorganic carbon in the Midriff Islands region of the Gulf of California: Influence of water masses from 2002-03-01 to 2004-09-15 (NCEI Accession 0307455). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/yk48-2n56. 2025-08-28 publication International DOI Foundation (IDF) https://doi.org/10.25921/yk48-2n56 NOAA National Centers for Environmental Information gov.noaa.nodc:0307455 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307455.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307455.html Related dataset information Hernández-Ayón, J. Martín Autonomous University of Baja California author Chapa-Balcorta, Cecilia Autonomous University of Baja California author Delgadillo-Hinojosa, Francisco Autonomous University of Baja California author Camacho-Ibar, Victor Autonomous University of Baja California author Huerta-Díaz, Miguel Ángel Autonomous University of Baja California author Santamaria-del-Angel, Eduardo Autonomous University of Baja California author Galindo-Bect, Salvador Autonomous University of Baja California author Segovia-Zavala, José Antonio Autonomous University of Baja California author Álvarez, Luz de Lourdes Aurora Coronado Autonomous University of Baja California author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project Data Management Support for the International Global Ocean Carbon and Repeat Hydrography Program 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/ HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/ Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project eng; USA utf8 environment oceans -110.321 -105.396 18.432 25.39 2015-06-03 2015-06-16 This data package (Submission ID: BJGEMB38G) was acquired by NCEI from the Scientific Data Integration System (SDIS) at the NOAA Pacific Marine Environmental Laboratory (PMEL) in accordance with the archival submission agreement between NCEI and PMEL. In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Originator data format 0.328 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0309426.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/8s4x-p765 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/309426 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/309426 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0242/0309426/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0309426 v1.1 was published. 2025-11-15T02:14:28Z NCEI Accession 0309426 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0309426/1.1 HTTPS NCEI Accession 0309426 v1.1 published 2025-11-15T02:14:28Z download NCEI Accession 0309426 was revised and v2.2 was published. Updates were received for this dataset. These updates were copied into the data/0-data/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. 2025-12-02T18:07:43Z NCEI Accession 0309426 v2.2 publication https://www.ncei.noaa.gov/archive/accession/0309426/2.2 HTTPS NCEI Accession 0309426 v2.2 published 2025-12-02T18:07:43Z download dataset Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: DIC; Unit: umol kg-1; Observation type: Profile (discrete samples); Sampling instrument: Niskin bottle; Analyzing instrument: Discrete dissolved inorganic carbon (DIC) measurement (Coulomerter); Uncertainty: 5 umol kg-1 Parameter or Variable: Total alkalinity; Abbreviation: TA; Unit: umol kg-1; Sampling instrument: Niskin bottle; Analyzing instrument: Alkalinity titrator; Uncertainty: 5 umol kg-1 Parameter or Variable: pH on the total scale; Abbreviation: pH_TS_measured; Observation type: profile; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: Measured; Sampling instrument: CTD; Analyzing instrument: CTD Parameter or Variable: CTD Temperature; Abbreviation: CTDTEMP_ITS90; Unit: Deg. C; Controlled vocabulary name: Water Temperature; Observation type: profile; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: Measured; Sampling instrument: CTD; Analyzing instrument: CTD Parameter or Variable: CTD Oxygen; Abbreviation: CTDOXY; Unit: UMOL/KG; Controlled vocabulary name: Dissolved Oxygen Concentration; Observation type: profile; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: Measured; Sampling instrument: CTD; Analyzing instrument: CTD Parameter or Variable: CTD Salinity; Abbreviation: CTDSAL_PSS78; Controlled vocabulary name: Salinity; Observation type: profile; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: Measured; Sampling instrument: CTD; Analyzing instrument: CTD asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian carbon dioxide (CO2) gas analyzer carbon dioxide (CO2) gas analyzer measures gaseous carbon dioxide Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption. Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water. To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water. CTD CTD Conductivity-Temperature-Depth probe Niskin bottle Niskin bottle Device for obtaining samples of seawater at a specific depth Why special entry for Niskin bottle but no entry for Nansen bottle? oxygen sensor oxygen sensor Any instrument that measures oxygen content in a compound. pH sensor pH sensor generic meter used to measure pH Any of a class of instruments used to quantify pH in a water or other type of sample. salinometer salinometer generic salinometer use salinometer when the instrument type used is unclear but the data include salinity measurements temperature sensor temperature sensor A sensor used to measure temperature. titrator titrator titrator RV Alpha Helix Updated information from ICES for the platform ALPHA HELIX from UNITED STATES. Name : ALPHA HELIX Flag : UNITED STATES - US (ISO Country Code) Call Sign : WSD7078 Title : RV Platform Class : Research vessel IMO : 6600905 Commissioned Date : 1966 Current Length : 41 Built : 1966 Notes : In 2007 University of Alaska Fairbanks sold the vessel to Stabbert Maritime Information Source : http://www.rvdata.us/voc/vessel (URL) Lloyds URL : http://www.seasearcher.com/lmiu/vessels/overview.htm?vesselID=70572