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A New Nutation Model Of Nonrigid Earth With Ocean And Atmosphere

Published online by Cambridge University Press:  12 April 2016

Cheng-li Huang ,
Wen-jing Jin  and
Xing-hao Liao
Cheng-li Huang
Affiliation:
Shanghai Astronomical Observatory, UCAR, NAO, CAS, Shanghai, 200030, P.R.China (email: clhuang@center.shao.ac.cn)
Wen-jing Jin
Affiliation:
Shanghai Astronomical Observatory, UCAR, NAO, CAS, Shanghai, 200030, P.R.China (email: clhuang@center.shao.ac.cn)
Xing-hao Liao
Affiliation:
Shanghai Astronomical Observatory, UCAR, NAO, CAS, Shanghai, 200030, P.R.China (email: clhuang@center.shao.ac.cn)

Abstract

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By integrating the truncated complex scalar gravitational motion equations for an anelastic, rotating, slightly elliptical Earth, the complex frequency dependent Earth transfer functions are computed directly. Unlike the conventional method, the effects of both oceanic loads and tidal currents are included via outer surface boundary conditions, all of which are expanded to second order in ellipticity. A modified ellipticity profile in second order accuracy for the non-hydrostatic Earth is obtained from Clairaut’s equation and the PREM Earth model by adjusting both the ellipticity of the core-mantle boundary and the global dynamical ellipticity to modern observations. The effects of different Earth models, anelastic models, and ocean models are computed and compared. The atmospheric contributions to prograde annual, retrograde annual and retrograde semiannual nutation are also included as oceanic effects. Finally, a complete new nutation series of more than 340 periods, including in-phase and out-of-phase parts of longitude and obliquity terms, for a more realistic Earth, is obtained and compared with other available nutation series and observations.

Type
Section 2. Improved Definitions and Models
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 242 - 247
Copyright
Copyright © US Naval Observatory 2000

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