Ocean Observatories Initiative

Quantify the air-sea exchange of energy and mass, especially during high winds (greater than 20 meters-per-second), to provide estimates of energy and gas exchange between the surface and deep ocean. Such measurements should improve the predictive capability of storm forecasting and climate change models.

Examine how climate variability affects ocean circulation, weather patterns, the ocean's biochemical environment and marine ecosystems.

Understand the role of turbulent mixing in the transfer of materials within the ocean and in the exchange of energy and gases between the ocean and atmosphere.

Quantify the processes governing the coastal ocean.

OOI Seafloor processes. Image Credit: OOI Regional Cabled Array program and the Center for Environmental Visualization, University of Washington

Examine the degree to which active tectonic plate boundaries influence the ocean from physical, chemical and biological perspectives. Lithospheric movements and interactions at plate boundaries at or beneath the seafloor are responsible for short-term events such as earthquakes, tsunamis and volcanic eruptions. These regions are also host to the densest hydrothermal and biological activity in the ocean basins.

The oceanic crust contains the largest aquifer on Earth and supports a vast deep biosphere. Thermal circulation and reactivity of seawater-derived fluids can modify the composition of oceanic plates, lead to the formation of hydrothermal vents that support unique micro- and macro-biological communities and concentrate methane to form massive methane gas and methane hydrate reservoirs.

The CGSN is made up of two coastal arrays and four global arrays.

Coastal arrays provide sustained, adaptable access to complex coastal systems. Coastal arrays extend from the continental shelf to the continental slope, allowing scientists to examine coastal processes including upwelling, hypoxia, shelf break fronts, and the role of filaments and eddies in cross-shelf exchange. Technologies that gather data in the coastal region include moored buoys with fixed sensors, moored vertical profilers, seafloor cables, gliders and autonomous underwater vehicles.

The coastal observatory includes a long-term Endurance Array in the Eastern Pacific and a re-locatable Pioneer Array in the Western Atlantic. Woods Hole Oceanographic Institution installed and operates the Pioneer Array. Oregon State University installed and operates the Endurance Array.

Conceptual Design of the Pioneer Array. Credit: Woods Hole Oceanographic Institution. Disclaimer: All data are subject to revision without notice.

The Pioneer Array is a network of platforms and sensors that operate on the continental shelf and slope south of New England. A moored array is centered at the shelf break in the mid-Atlantic Bight south of Cape Cod, Massachusetts. Autonomous underwater vehicles (AUVs) sample the frontal region in the vicinity of the moored array and gliders resolve mesoscale features on the outer shelf and the slope sea between the shelf break front and the Gulf Stream.

The Pioneer Array provides a three-dimensional view of key biophysical interactions at the shelf break using its flexible, multiplatform array that combines moored and mobile components with high spatial and temporal resolution. In its initial location south of Cape Cod, the Pioneer is embedded within an established regional observing system. The Pioneer Array is planned to move from place to place over approximately five-year intervals to characterize processes in different coastal ocean environments.[20]

Conceptual Design of the Endurance Array Oregon Line. Credit: Oregon State University. Disclaimer: mooring sites are not yet finalized; all data are subject to revision without notice.

The Endurance Array, located on the continental shelf and slope off Oregon and Washington, provides a long-term network of moorings, benthic nodes, cabled and uncabled sensors and gliders. The array consists of two lines of moorings, one off Newport, Oregon (the Oregon Line) and the other off Grays Harbor, Washington (the Washington Line). Gliders sample between the mooring lines. The array focuses on observing the influence of the Columbia River on the coastal ecosystem. It also samples a prototypical upwelling regime on a narrow continental shelf where anoxia events are common. Some Endurance Array Oregon Line infrastructure connects to the RSN cabled network to provide enhanced power and communications for observing water column and seafloor processes.[21]

Conceptual Design of the Global Arrays. Credit: Woods Hole Oceanographic Institution. Disclaimer: mooring site arrangements are not yet finalized, all data are subject to revision without notice.

Locations of the global arrays were selected by a team of scientists (~300 people)[22] based on regions that are under-sampled and subject to extreme conditions (e.g., high winds and sea states) that are challenging for continuous or even frequent ship-based measurements. The planned global study sites include instrumented moorings and gliders in four locations: Argentine Basin;[23] Irminger Sea;[24] Southern Ocean;[25] and Station Papa.[26] The global arrays are developed and operated by Woods Hole and Scripps.

Observations from these high latitude areas are critical to understanding ocean circulation and climate change processes. The global arrays each include four moorings (except Station Papa, which has three) composed of fixed and moving sensors that measure air-sea fluxes of heat, moisture, and momentum—as well as physical, biological, and chemical properties of the water column. Each array also includes gliders to sample within the array's footprint.

The OOI Regional Scale Nodes focus on two primary study sites (Hydrate Ridge and Axial Seamount) with the potential for future expansion to other sites. Credit: OOI Regional Scale Nodes program and Center for Environmental Visualization, University of Washington. Disclaimer: all data are subject to revision without notice.

The Regional Cabled Array consists of cabled arrays of ocean observing sensors in the Northeast Pacific Ocean. They are connected by approximately 900 kilometers (560 miles) of electro-optical cable. The design provides high power (10 kV, 8 kW) and bandwidth (10 GbE) to sensor arrays on the seafloor and throughout the water column using moorings with instrumented wire-following profilers, 200 m instrumented platforms and winched profilers. The RSN was installed and operated by the University of Washington.

The two primary study sites are Hydrate Ridge, an area of massive sub-seafloor gas-hydrate deposits and fluxes of methane from the seafloor into the ocean, and Axial Seamount, the most magmatically robust volcano on the Juan de Fuca Ridge spreading center that erupted in April 2011.

The RSN complements the NEPTUNE cabled observatory that Ocean Networks Canada operates on the northern Juan de Fuca plate. Together these observatories enable long-term, plate-scale seafloor and ocean investigations in the Northeast Pacific.[27]

CI Deployment Topology. Graphic created by J.B. Matthews.

The Cyberinfrastructure component links marine infrastructure to scientists and users. It manages and integrates data from the different OOI sensors. It provides a common operating infrastructure, the Integrated Observatory Network (ION), connecting and coordinating the operations of the marine components (global, regional, and coastal scale arrays). It also provides resource management, observatory mission command and control, product production, data management and distribution (including strong data provenance) and centrally available collaboration tools.

ION connects and coordinates operations of the OOI marine components with oceanographic research communities. The University of California, San Diego initially designed the cyber infrastructure. The project later relocated to Rutgers University.[28] In October 2020, Oregon State University assumed the cyberinfrastructure responsibilities for the OOI, with an orderly transition of resources and equipment to take place over the next year.

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