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Relative sea level (RSL) is defined as the sea level that is observed with respect to a land-based reference frame. [1] It is often contrasted with eustatic sea level , which is a measure of the total mass or volume of the oceans.
Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative to a reference datum for mean sea level (MSL). It is also used in aviation, where some heights are recorded and reported with respect to mean sea level (contrast with flight level ), and in the atmospheric sciences , and in land ...
The sea-level curve (also known as the eustatic curve) is the representation of the changes of the sea level relative to present day mean sea level as gleaned from the stratigraphic record throughout the geological history. The first such curve is the Vail curve or Exxon curve.
The most up-to-date chronology of sea level change through the Phanerozoic shows the following long-term trends: [16] Gradually rising sea level through the Cambrian; Relatively stable sea level in the Ordovician, with a large drop associated with the end-Ordovician glaciation; Relative stability at the lower level during the Silurian
While sea level rise is uniform around the globe, some land masses are moving up or down as a consequence of subsidence (land sinking or settling) or post-glacial rebound (land rising as melting ice reduces weight). Therefore, local relative sea level rise may be higher or lower than the global average. Changing ice masses also affect the ...
Standard sea-level conditions (SSL), [1] also known as sea-level standard (SLS), defines a set of atmospheric conditions for physical calculations.The term "standard sea level" is used to indicate that values of properties are to be taken to be the same as those standard at sea level, and is done to define values for use in general calculations.
Eustatic sea level is not relative to local surfaces, because relative sea level depends on many factors – including tectonics, continental rise and subsidence. Eustatic sea level follows the "bathtub approach" which describes the ocean as a single bathtub. One can add or remove water and Earth's oceans will gain or lose water globally.
A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase , in which case it is also known as a tidal datum . [ 1 ]