Page 343 - 9 teachers social book 9 @ 2077 ctp_Neat

Nepali- led team makes NASA discoveries- April 10, 2016 and finds answer to the
puzzle why Earth's polar motion was moving eastwards dramatically.

Before 2000, the Earth's spin axis was drifting towards Canada (green arrow
left global) effects of change in water mass in different regions (Centre global)
have pulled the drift east wards and speeded up the rotation (right global).

Kathmandu, April 8

Thanks to a ground breaking research led by a Nepali scientist at NASA, science now
has an answer to a protected puzzle: why was Earth polar nation moving eastward
dramatically from Canada to the United Kingdom- since the beginning if the new
millennium and the mystery behind the east west swings in the polar nation on a
decadal basis.

Both melting of polar ice sheets and global land water storage pattern are responsible
for the change in Earth’s rotation, according to Surendra Adhikari and Erik Ivins
research. Their finding have been published in a paper "climate- driven polar nation
2003- 2015 in journal Science Advances today.

The NASA scientists analysed space decodetic and satellite gravimetric data from
2003 to 2015 to show that all of the main features of polar motion have been explained
by global- scale contained-ocean mass transport owning to the combined effect melting
of the Green land west Antarctic ice sheets and the changes in global continental
water storage.
Earth’s spin axis wobbles on a decadal pattern mean in some years it heads to the east
and in the following years to the west and thus, this decadal swing continues. This
has been well documented for 115 years.

343 Dynamic Social Studies - Book IX