Satellite Altimetry in Ocean Dynamics
Summary
Satellite altimetry has transformed our understanding of ocean dynamics by providing precise measurements of sea surface height (SSH) from space. By emitting radar pulses toward the ocean and timing their return, altimeters map variations in sea level to centimetre accuracy. These measurements reveal large-scale circulations driven by the marine geoid, regional currents, mesoscale eddies and internal waves. Gridded altimetric datasets underpin estimates of sea-level rise, inform forecasts of ocean state and support climate models. Advances in sensor calibration, geophysical corrections and data merging have refined sea surface height anomaly and absolute dynamic topography products, yielding ever-finer resolution of ocean circulation patterns. Combined with in situ observations from drifting buoys and Argo floats, altimetry feeds four-dimensional data assimilation systems that chart the evolution of currents, tides and eddies worldwide. Emerging wide-swath interferometric altimeters will soon resolve features down to tens of kilometres, promising new insight into energy exchanges, submesoscale processes and coastal dynamics. Together, these developments reinforce the global role of altimetric measurements in monitoring climate change, improving operational oceanography and elucidating the fundamental physics of the ocean.
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Satellite Altimetry in Ocean Dynamics publication trend
The graph below shows the total number of articles in satellite altimetry in ocean dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Satellite altimetry: Measurement of sea surface height by radar pulses emitted from an orbiting satellite.
Sea surface height anomaly (SSHA): Deviation of instantaneous sea surface height from a mean reference level.
Absolute dynamic topography (ADT): Height of the sea surface above the geoid, reflecting ocean currents’ integrated effect.
Geostrophic currents: Ocean flows driven by horizontal pressure gradients balanced by Earth’s rotation.
Mesoscale variability: Ocean features such as eddies and fronts with spatial scales of 10–100 km.
Wide-swath altimetry: Interferometric radar technique that maps sea surface height over broad swaths, enabling two-dimensional fields.
References
- Improved global sea surface height and current maps from remote sensing and in situ observations. Earth System Science Data (2023).
- Ocean Circulation from Space. Surveys in Geophysics (2023).
- Global Observations of Fine-Scale Ocean Surface Topography With the Surface Water and Ocean Topography (SWOT) Mission. Frontiers in Marine Science (2019).
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