Northwest Pacific Ocean
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Authors: A.B. Watts, A.R. Leeds
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Created: 1976
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Resp: A.B. Watts
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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. DOI: 10.1111/j.1365-246X.1977.tb04172.x
Web of Science ID:
DRCI:DATA2018029012462775
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