World Ocean Atlas

World Ocean Atlas
Name	World Ocean Atlas
Caption	Global gridded ocean climatology
Developer	National Oceanic and Atmospheric Administration National Centers for Environmental Information
Released	1994
Latest release	2018
Operating system	Platform independent
Genre	Oceanographic climatology
License	Public domain (NOAA)

World Ocean Atlas is a decadal-scale, gridded global ocean climatology produced as a synthesis of observational hydrographic and profiling data sets to provide objectively analyzed fields of temperature, salinity, dissolved oxygen, nutrients, and other physical and biogeochemical properties. The product is maintained by National Oceanic and Atmospheric Administration National Centers for Environmental Information in collaboration with institutions such as Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory and international partners like Scientific Committee on Oceanic Research.

Overview

The Atlas compiles data to generate monthly mean fields at standard depth levels and climatological means used by communities including Intergovernmental Panel on Climate Change, World Meteorological Organization, United Nations Educational, Scientific and Cultural Organization Intergovernmental Oceanographic Commission and research centers such as NOAA Pacific Marine Environmental Laboratory and UK Met Office. Typical outputs include objectively analyzed temperature and salinity on a 1°×1° grid, and derived products suited to modeling systems at institutions like European Centre for Medium-Range Weather Forecasts, NASA Goddard Space Flight Center, Fisheries and Oceans Canada, and Japan Agency for Marine-Earth Science and Technology. The Atlas underpins studies published in journals like Journal of Geophysical Research, Progress in Oceanography, Nature Climate Change, and Science.

History and Development

Initial efforts trace to syntheses coordinated by International Commission for the Scientific Exploration of the Mediterranean Sea and national hydrographic offices, culminating in the first NOAA-managed releases during the 1990s with input from National Aeronautics and Space Administration and the Office of Naval Research. Subsequent major versions were developed in response to community needs identified at workshops hosted by World Climate Research Programme, Intergovernmental Panel on Climate Change assessments, and interagency meetings involving United States Geological Survey and European Space Agency. Collaborations with mapping agencies such as National Geospatial-Intelligence Agency and archives like British Oceanographic Data Centre shaped quality-control protocols and metadata standards influenced by International Oceanographic Data and Information Exchange.

Data Sources and Methodology

Primary observational inputs include historical hydrographic casts from programs like Global Temperature and Salinity Profile Programme, ship-based conductivity–temperature–depth records from fleets associated with Global Ocean Ship-based Hydrographic Investigations Program, and autonomous profiles from arrays maintained by Argo (oceanography), with supplementary records from moorings of TAO/TRITON, PIRATA, and ENSO monitoring efforts. Data ingestion follows procedures harmonized with archives such as World Ocean Database and metadata standards from International Hydrographic Organization. Objective analysis employs statistical techniques utilized by groups at National Climatic Data Center, including weighted averaging, optimal interpolation, and error estimation methods pioneered in research at Massachusetts Institute of Technology and University of Washington oceanography programs. Quality control references include treatment developed at Scripps Institution of Oceanography and flags consistent with procedures from British Antarctic Survey.

Parameters and Products

Cataloged parameters comprise temperature, salinity, dissolved oxygen, apparent oxygen utilization, percent oxygen saturation, phosphate, nitrate, silicate, and density computed from International Thermodynamic Equation of Seawater 2010 formulations developed by Intergovernmental Oceanographic Commission collaborators. Products are delivered as monthly climatologies, annual means, seasonal composites, and decadal averages at standard depth levels aligned with practices at Global Ocean Observing System. Gridded outputs support vertical interpolations and are packaged in formats congruent with model inputs used by Regional Ocean Modeling System, Community Earth System Model, and data assimilation frameworks at NOAA National Weather Service and European Centre for Medium-Range Weather Forecasts.

Applications and Uses

Scientists at Scripps Institution of Oceanography, Lamont–Doherty Earth Observatory, and Woods Hole Oceanographic Institution utilize the Atlas for baseline state estimation in studies of Atlantic Meridional Overturning Circulation, El Niño–Southern Oscillation, Pacific Decadal Oscillation, and climate variability examined by Intergovernmental Panel on Climate Change. Oceanographers and ecologists at Monterey Bay Aquarium Research Institute, National Marine Fisheries Service, and World Wildlife Fund apply nutrient and oxygen fields to investigate hypoxia, fisheries habitat, and biogeochemical cycles reported to Convention on Biological Diversity. Operational agencies including NOAA National Weather Service, Naval Meteorology and Oceanography Command, and European Maritime Safety Agency incorporate Atlas climatologies into forecasts, ship-routing services, and environmental assessments related to incidents involving International Convention for the Prevention of Pollution from Ships.

Accessibility and Distribution

Data distribution channels include archival access via National Centers for Environmental Information portals, data services interoperable with Open Geospatial Consortium standards, and bulk downloads used by researchers at PANGEA (data repository), DataONE, and university consortia. The Atlas is promoted at conferences organized by American Geophysical Union, European Geosciences Union, and workshops held by Global Ocean Observing System. Documentation and user guides reference metadata conventions endorsed by ISO committees and licensing aligned with United States Department of Commerce open data policies. Users can access gridded files compatible with analysis tools created at National Center for Atmospheric Research, The MathWorks, and community software projects hosted on platforms such as GitHub.

Category:Oceanography datasets