Sea level the warmer water expands. For at least the last 100 years, sea level has been rising at an average rate of about per year. Most of this rise can be attributed to the increase in temperature of the sea and the resulting slight thermal expansion of the upper of sea water. Additional contributions, as much as one-quarter of the total, come from water sources on land, such as melting snow and glaciers and extraction of groundwater for irrigation and other agricultural and human uses. Pilots can estimate height above sea level with an altimeter set to a defined barometric pressure.
Eustatic sea level ocean water mass (ice sheet runoff) • When an ice sheet such as Greenland begins to lose its ice mass due to melt, the liquid water is transported to the ocean. According to the ‘bathtub theory’, ice sheet runoff from Greenland will effect Eustatic sea level in all areas of the world whether proximal or distant. • Ocean water mass may also shrink in size if continental ice sheet grow in size, thereby removing liquid water from oceans and converting them to grow ice sheets 2. Changes in the size of the ocean basin (GIA: glacial isostatic adjustment) • The