ISG

   International Service for the Geoid

   

Search in ISG Website



Links:


























      

Services - Geoid Repository


Regional Models

Northwest Pacific Ocean


  Authors: A.B. Watts, A.R. Leeds     Created: 1976    Resp: A.B. Watts  
      Status: PUBLIC    
Description:
This is a gravimetric geoid the Northwest Pacific Ocean, covering the area 1° < lat < 65°, 106° < lon < 210° with a grid spacing of 1°x1°. It is based on a compilation of 147000 surface ship and pendulum gravity measurements, from which 1°x1° gravity anomaly averages are derived. The gravimetric geoid is computed by Stokes's integration in the framework of a remove-restore procedure with the GEM-6 global gravity model as reference field. The rms of the differences between this gravimetric geoid and contemporary satellite derived models (SE-3, GEM-6 and GEM-8) is about 6 m. In particular, difference geoid undulations range from a maximum of +19 m over the Hawaiian ridge to a minimum of −31 m over the junction of the Kuril and Aleutian trenches. The agreement between this gravimetric geoid and Skylab-4 and Geos-3 altimeter data is close for wavelengths greater than about 300 km but poor for shorter wavelengths.

References:
A.B. Watts, A.R. Leeds (1977). Gravimetric geoid in the Northwest Pacific Ocean. Geophysical Journal International, 50(2), pp. 249-277.

Alaska