Open AccessChanges in the Earth's Spin Rotation due to the Atmospheric Effects and Reduction in Glaciers
Author(s) -
Sung-Ho Na,
Jungho Cho,
Tu-Hwan Kim,
KiWeon Seo,
Kookhyoun Youm,
SeungHwan Yoo,
ByungKyu Choi,
Ha-Su Yoon
Publication year - 2016
Publication title -
journal of astronomy and space sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.273
H-Index - 11
eISSN - 2093-5587
pISSN - 2093-1409
DOI - 10.5140/jass.2016.33.4.295
Subject(s) - earth's rotation , glacier , atmosphere (unit) , earth (classical element) , geology , atmospheric sciences , environmental science , physics , geodesy , meteorology , geomorphology , astronomy
The atmosphere strongly affects the Earth’s spin rotation in wide range of timescale from daily to annual. Its dominant\udrole in the seasonal perturbations of both the pole position and spinning rate of the Earth is once again confirmed by a\udcomparison of two recent data sets; i) the Earth orientation parameter and ii) the global atmospheric state. The atmospheric\udsemi-diurnal tide has been known to be a source of the Earth’s spin acceleration, and its magnitude is re-estimated by\udusing an enhanced formulation and an up-dated empirical atmospheric S2 tide model. During the last twenty years, an\udunusual eastward drift of the Earth’s pole has been observed. The change in the Earth’s inertia tensor due to glacier mass\udredistribution is directly assessed, and the recent eastward movement of the pole is ascribed to this change. Furthermore,\udthe associated changes in the length of day and UT1 are estimated