Editing Global mean sea level (section)

== Geographic / System Context ==
Global mean sea level pertains to the Earth's oceans as a whole, encompassing all ocean basins and marginal seas. It is a spatially aggregated measure that averages sea surface height variations worldwide, smoothing regional differences caused by factors such as ocean currents, atmospheric pressure, and gravitational anomalies. The geographic scope includes the interconnected global ocean system, which covers approximately 71% of the Earth's surface and interacts dynamically with the atmosphere, cryosphere, and terrestrial hydrosphere.