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    •  Call for two new members of the IOCCP Scientific Steering Group
      Call for two new members of the IOCCP Scientific Steering Group
      We are excited to let you know that IOCCP is looking for two new members to join its Scientific Steering Group (SSG) for terms beginning on 1 October 2025, to act as leaders responsible for Coordination of Optimal Global Design for Ocean Carbon Observations (Position #1) and Coordination of Regional…
      >>
    • First steps to implement SOCONET-Tier 1 published
      First steps to implement SOCONET-Tier 1 published
      We are excited to share with you an important document describing the first operational steps to implement the reference-quality measurements of the Surface Ocean CO2 Observing Network (SOCONET-Tier 1). SOCONET-Tier 1 is the observational cornerstone for surface ocean fCO2w observations to quantify sea-air…
      >>
    •  SOCAT version 2025 released
      SOCAT version 2025 released
      We are thrilled to inform you that the Surface Ocean CO2 Atlas (SOCAT) version 2025 is now available on the SOCAT website. We would like to congratulate and thank the entire SOCAT team, as well as all data providers, for their enormous continuous efforts related to annual releases of the product.
      >>
    • Open-access book on Chemical Reference Materials for Oceanography: History, Production, and Certification
      Open-access book on Chemical Reference Materials for Oceanography: History, Production, and Certification
      We wanted to share an exciting news that an open-access book Chemical Reference Materials for Oceanography: History, Production, and Certification has now been published in the Springer Oceanography book series.
       
      The book explores the history, production, and certification of reference materials
      >>

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    Nitrous Oxide

    Thursday, 21 November 2024

    Nitrous oxide (N2O) is an important climate-relevant trace gas in the Earth’s atmosphere. In the troposphere it acts as a strong greenhouse gas and in the stratosphere it acts as an ozone depleting substance because it is the precursor of ozone depleting nitric oxide radicals. Because of the on-going decline of chlorofluorocarbons and the continuous increase of N2O in the atmosphere, the contributions of N2O to both the greenhouse effect and ozone depletion will be even more pronounced in the 21st century.

     

    The ocean - including its coastal areas such as continental shelves, estuaries and upwelling areas - is a major source of N2O and contributes about 30% to the atmospheric N2O budget. Oceanic N2O is mainly produced as a by-product during archaeal nitrification (i.e. ammonium oxidation to nitrate) whereas bacterial nitrification seems to be of minor importance as source of oceanic N2O. N2O occurs also as an intermediate during microbial denitrification (nitrate reduction via N2O to dinitrogen, N2). Nitrification is the dominating N2O production process, whereas denitrification contributes only 7-35% to the overall N2O water column budget in the ocean. The amount of N2O produced during both nitrification and denitrification strongly depends on the prevailing dissolved oxygen (O2) concentrations and is significantly enhanced under low (i.e. suboxic) O2 conditions. N2O is usually not detectable in anoxic waters because of its reduction to N2 during denitrification. Thus, significantly enhanced N2O concentrations are generally found at oxic/suboxic or oxic/anoxic boundaries.

     

    The strong O2 sensitivity of N2O production is also observed in coastal characterised by seasonal shifts in the O2 regime. A biological source of N2O in the well-oxygenated mixed layer/euphotic zone seems to be unlikely. Global maps of N2O in the surface ocean show enhanced N2O anomalies (i.e. supersaturation of N2O) in equatorial upwelling regions as well as N2O anomalies close to zero (i.e. near equilibrium) in large parts of the open ocean.

     

    The MEMENTO (The MarinE MethanE and NiTrous Oxide database: https://memento.geomar.de) project has been launched with the aim to collect and archive N2O data sets and to provide actual fields of surface N2O for emission estimates.

     

     

     

     

    Gregor Rehder

    Responsible

    SSG Member 

     
     

    NITROUS OXIDE EOV

     pdfSpecification Sheet 

     

     

     

     

     

    Ocean interior observations: projects and programs

    Friday, 17 November 2023
     

     

    IOCCP is engaging in a number of collaborations with international research programs, projects and expert working groups on activities related to the coordination of ocean interior observations.

     

    GO SHIPlogo

    GO-SHIP

    https://www.go-ship.org

    Contact: Martin Kramp - Coordinator

    BGC-Argo logo

    Biogeochemical Argo

    http://biogeochemical-argo.org/data-access.php

    Contact: Ken Johnson (USA) & Hervé Claustre (France)

    U.S. Global Ocean Ship-based Hydrographic Investigations Program

    https://usgoship.ucsd.edu/

    Ocean interior observations: resources

    Friday, 17 November 2023
     

     

    Following is a list of various resources related to ocean interior observations. These include links to webinars, presentations, special reports and outreach publications, as well as a list of selected review and high impact research papers. Please contact the IOCCP Office if you have any comments, questions or suggestions for additional resources useful to the community.

    Resources
    BGC Argo resources

     

     

     

     

    Upcoming IOCCP Events

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    The IOCCP promotes the development of a global network of ocean carbon observations for research through technical coordination and communication services, international agreements on standards and methods, and advocacy and links to the global observing systems. The IOCCP is co-sponsored by the Scientific Committee on Oceanic Research and the Intergovernmental Oceanographic Commission of UNESCO. Read more…

    • Framework for Ocean Observing
    • Surface Ocean Biogeochemistry Observations
    • Ocean Interior Observations
    • Time Series Efforts
    • Oxygen
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    • Nutrients
    • Nitrous Oxide
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    • Related Projects and Programs

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    IOCCP meetings, IOCCP-related meetings as well as events related to a wider scope in marine biogeochemistry.
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