中研院地球科學研究所 - 地球動力學研究室
IES, Academia Sinica - Geodynamics Lab


Results

Ocean tide loading displacements in Taiwan derived from continuous GPS observations

Work on investigating tidal deformation of the Solid Earth using observations from global GPS continuously operating reference stations. The main research contents involve:

  1. To develop the method of measuring tidal displacement parameters using continuous GPS observations
  2. To estimate empirical Love numbers of the solid Earth from the GPS tidal displacements
  3. To establish GPS-derived tidal correction models for precise GPS data processing
  4. To analyze the effect of GPS-derived tidal corretions on position time series

Results from this research will provide not only important constraints to the structure of the Earth's interior, but also empirical GPS tidal displacement coefficients for modern geodetic and geophysical observations.

Fig. Spatial distribution of M2 phasor diagrams in three components for the residuals between the GPS tidal displacement estimates and the OTL predictions using the NAO99b and NAO99jb models. The phasor diagrams are represented by the red and blue arrows, for inland GPS sites more than 40 km from the coast and coastal GPS sites within 40 km of the coastline, respectively. The length and azimuth of the arrows indicate amplitude and phase, and phases increase clockwise from the upward direction. The amplitudes and phases of the OTL predictions using the NAO99b and NAO99jb models are indicated by color scales and white contours, respectively.