Journal of Astronomy and Space Sciences

  • 제33권4호
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  • Pages.295-304
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  • 2016
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  • 2093-5587(pISSN)
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  • 2093-1409(eISSN)
한국우주과학회 (The Korean Space Science Society)
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Changes in the Earth's Spin Rotation due to the Atmospheric Effects and Reduction in Glaciers

  • Na, Sung-Ho (Department of Space Survey Information Technology, Ajou University) ;
  • Cho, Jungho (Korea Astronomy and Space Science Institute) ;
  • Kim, Tu-Hwan (Department of Space Survey Information Technology, Ajou University) ;
  • Seo, Kiweon (Department of Earth Science Education, Seoul National University) ;
  • Youm, Kookhyoun (Department of Earth Science Education, Seoul National University) ;
  • Yoo, Sung-Moon (Korea Astronomy and Space Science Institute) ;
  • Choi, Byungkyu (Korea Astronomy and Space Science Institute) ;
  • Yoon, Hasu (Korea Astronomy and Space Science Institute)
  • 투고 : 2016.09.10
  • 심사 : 2016.10.28
  • 발행 : 2016.12.15
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초록

The atmosphere strongly affects the Earth's spin rotation in wide range of timescale from daily to annual. Its dominant role in the seasonal perturbations of both the pole position and spinning rate of the Earth is once again confirmed by a comparison of two recent data sets; i) the Earth orientation parameter and ii) the global atmospheric state. The atmospheric semi-diurnal tide has been known to be a source of the Earth's spin acceleration, and its magnitude is re-estimated by using an enhanced formulation and an up-dated empirical atmospheric S2 tide model. During the last twenty years, an unusual eastward drift of the Earth's pole has been observed. The change in the Earth's inertia tensor due to glacier mass redistribution is directly assessed, and the recent eastward movement of the pole is ascribed to this change. Furthermore, the associated changes in the length of day and UT1 are estimated.

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참고문헌

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