Gravity’s time dependent variations

Gravity’s time dependent variations on surface of the earth Gravity on the Earth’s surface also undergoes time dependent variations. These temporal changes in gravitational pull…

Gravity’s time dependent variations on surface of the earth

Gravity on the Earth’s surface also undergoes time dependent
variations. These temporal changes in gravitational pull are as a result
of factors such as lunar-solar tides, changes in the volume of
underground water, atmospheric and oceanic mass redistribution, changes
in the amount of snow cover, earthquakes, post-glacial rebound in the
Earth’s mantle and long-term mantle convection. These geophysical
alterations have serious implications and should therefore be understood
very well for researchers to effectively monitor global climatic
changes, rotation of the planet Earth and changes in sea level.
Moreover, redistribution in the mass of planet Earth alters the position
of its center of mass. Although temporal variations in gravitational
pull owing to oceanic and solid earth tides are easy to determine,
non-tidal changes are comparatively harder to detect.According
to Chandle, data gathered from various satellites since the year 1998
indicates a bulge in the Earth’s gravitational field around the equator.
This change according to her is attributable to factors such as
fluctuations in the volumes of water held by oceans. The period
preceding the year 1998 was witnessing relatively smaller gravitational
bulges in the equator owing to post-glacial rebounds. Moreover, the
comparatively smaller changes are attributable to the melting of ice
sheets after the last Ice Age. After the ice melt, the land that had
been covered by the ice started to rise. This rebound of the ground led
to changes in gravity. Presently, the land forming the equatorial region
has been noted to bulge upwards while that at the poles has registered a
downward bulge. The corresponding changes in the Earth’s gravity can be
sensed through the use of ultra-precise laser tracking satellites.
Additionally, the changes can be realized through tracking alterations
in day length and the Earth’s rotation
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