Changes in the Antarctic Ice Sheet Mass and the Instability of the Earth’s Rotation over the Last 110 Years
The redistribution of water masses on the Earth entails changes in the components of the Earth’s inertia tensor and causes the motion of poles and changes of the Earth’s rotation speed.
N.S. Sidorenkov (1982) has deduced equations which connect the fluctuations of the World Ocean water mass ζ O or the ice mass of Antarctica ζ A , Greenland ζ G , and “the rest part of land” ζ C with the parameters of the Earth’s rotation (coordinates of the North Pole V 1, V 2 and velocity of rotation V 3).
Presently, parameters V 1, V 2, and V 3 of the Earth’s rotation are measured with a very high accuracy and can be used for the calculation of water exchange (values ζ O , ζ A ,ζ G , and ζ C ).
According to this idea, we have calculated the unknown changes of the specific amount of water in the World Ocean ζ O and the accumulation of ice in Antarctica ζ A , Greenland ζ G , and “the rest part of land” ζ C for 1891–2000 with a one-year discretion.
The computed (theoretical) series ζ O , ζ A , ζ G are compared with the empirical values ζ O , ζ A , ζ G . A close correlation between theoretical and empirical series ζ A for Antarctica is revealed. The possibility of using the theoretical series for the analysis of temporal variations in the geoid parameters is found. It has been estimated that because of the decadal fluctuations of the Antarctic ice sheet mass, the polar diameter of the geoid varied within ±25 cm over the last century.
KeywordsAntarctic and Greenland ice sheets sea level accumulation of ice via precipitation decade instability of the Earth’s rotation geoid
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