The Global Centre for Risk and Innovation (GCRI)
The ocean is measured by a global system of profiling floats, moored buoys, tide gauges, research and commercial ships, gliders and satellites. These observations underpin forecasts, climate monitoring, fisheries and coastal planning, but coverage is uneven and depends on sustained funding and data sharing. This page sets out how ocean observation is organized, where gaps lie, and what evidence serves those who fund and use it.
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For ocean observation, in GCRI's spatial-intelligence reading, the map opens on true-colour imagery, marine heat, sea temperature and chlorophyll with relief in 3D and a wave forecast chart at the centre, framed on Pacific Island states; every other NASA layer, live feed and forecast waits in the layer list.Satellite and model products as NASA publishes them, each with its own date; indicators, not assessments of any place; claim ceiling INTEGRATED.
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Ocean observing systems are the networks of floats, moorings, tide gauges, ships, gliders and satellites that measure the ocean, coordinated globally through the Global Ocean Observing System. They underpin forecasts and climate monitoring, but coverage is uneven, continuity depends on funding, and value depends on open data sharing.
The working screen behind this subject: its structure, terms and states. Names are placeholders and values illustrative.
Ocean observation · Fishing grounds 3 · Season 1
| Small pelagic | 0.7 | 1.5 | Sustainable |
| Reef fish | 0.9 | 1.3 | Overfished |
| Tuna-like | 1.0 | 0.9 | Sustainable |
Marine sensing and data limitations. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.
Floats profile temperature and salinity in the upper ocean, moorings watch fixed points, satellites map the surface, and ships measure what others cannot. Together they form the Global Ocean Observing System.
The deep ocean, polar seas, coastal zones and waters of many developing countries are poorly observed. Biogeochemical and biological variables lag physical ones.
Much observation is funded through research grants. When funding ends, records break, and the value of long series is lost.
Observations are useful only when shared quickly in standard formats. Free and open data exchange underpins forecasting and climate assessment.
Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.
| Term | Definition |
|---|---|
| Argo float | An autonomous instrument that drifts and profiles the upper ocean, reporting data by satellite. |
| Essential ocean variable | A variable identified by GOOS as most needed to observe and understand the ocean. |
| Mooring | An instrument platform anchored to the seafloor that records conditions at a fixed point. |
Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.
| Indicator | Unit | Cadence | Source type | Label |
|---|---|---|---|---|
| Operational Argo floats | count | monthly | Argo programme status | OBSERVED |
| Essential ocean variables with sustained observation | count by variable readiness level | per assessment | GOOS assessments | OFFICIAL |
| Tide gauges reporting in near real time | count | annual | GLOSS and national networks | OBSERVED |
| Coastal waters observed by in situ systems | percent of national coastline with monitoring | per assessment | National observing system records | REPORTED |
| Data latency | hours from measurement to availability | per platform | Data system records | OBSERVED |
| Ocean science capacity | researchers and research vessels per country | per assessment | IOC Global Ocean Science Report | REPORTED |
The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.
Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.
Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.
| Source | What it gives | Licence class |
|---|---|---|
| Argo programme data | Global temperature, salinity and biogeochemical profiles | Free and open, Argo data policy |
| OceanOPS (WMO and IOC) | Status of ocean observing platforms worldwide | Public, OceanOPS terms |
| IOC Global Ocean Science Report | National ocean science capacity and investment | Public, UNESCO terms (CC BY-SA 3.0 IGO for many) |
| GLOSS tide gauge network | Core network of tide gauges for sea level | Free, terms per data centre |
| World Ocean Database (NOAA NCEI) | Quality-controlled archive of ocean profile data | Public domain, US government data |
Oceans and Coasts prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.
| Who decides | The question | Evidence this page serves |
|---|---|---|
| National oceanographic and meteorological agencies | Which observations to sustain or add | Gap maps; readiness reviews |
| Research funders | How to fund long-term observation beyond project cycles | Continuity and gap evidence |
| Regional organizations | How to share observing capacity across countries | Capacity and data flow evidence |
The global ocean observing system combines satellite missions for sea-surface height, temperature, colour, winds and sea ice with in-situ networks: autonomous profiling floats, moored buoys, drifters, tide gauges, research and volunteer ships, and gliders. Coastal observing adds high-frequency radar, nearshore buoys and water-quality sensors. Together they feed forecasts, climate records and hazard warnings.
Coverage is uneven. The deep ocean, polar seas, coastal zones of many lower-income countries and biological and biogeochemical variables are under-observed. Satellites see the surface, not the interior, and struggle close to the coast. Long records exist at few locations, which limits trend and extreme-value analysis. Many networks depend on research funding renewed over short cycles, so continuity is itself a risk.
Observation also has a human dimension. Fishers, coastal communities and citizen scientists record changes in species, water quality and shoreline position that formal networks miss, and such records, gathered with consent and quality control, can fill gaps at the scales where decisions are made.
Altimetry, radiometry and ocean colour give global coverage of the surface, with reduced accuracy near coasts and under cloud.
Direct measurements of temperature, salinity, currents and sea level at points and profiles.
Models combine observations into gridded fields; where data are sparse, results lean on the model.
Limits: changes of instrument and method can create artificial shifts in records, and gridded products may look complete where few observations exist. Analysis should state which observations underlie a result.
The current service level is R0: information and enquiries. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.