Publication Date:
2021-05-19
Description:
In 2005, Hydrographic and Oceanographic Department (H.O.D ), Japan Coast Gurad, determined a new precise Marine Geoid model around Japan (Sasahara et al., 2006b). The new model covers the area 15° N‐50° N 120° E 160°E with the spacing of 1’x 1. By applying the remove‐restore technique the geoid undulations were calculated, and the Stokes’s integral was computed with the modified Stokes’s kernel(Featherstone, 2003) and1 D Fast Fourier Transform (Haagmans et al.,1993). We determined the model by using the gravity data derived from altimete. In this work, we corrected the long wavelength component of this gravity data. The new version of model is called MGM 2008 by using the corrected data. We evaluated the accuracy of Marine Geoid model. The method of evaluation is the comparison of the SSDH (Sea Surface Dynamic Height). SSDH can be calculated by using the SSH (Sea Surface Height) derived from altimeter and the geoid height. SSDH can be calculated from the CTD (Conductivity‐Temperature‐Depth) data, too. We compared both SSDH, and evaluated the standard deviation of the difference between SSDHgeo (SSH‐Geoid) and SSDHctd (CTD). The result showed the small standard deviation. Moreover, we calculated the geostrophic current with SSDH. The result that the high velocity part of geostrophic current mostly agreed with the axis of Kuroshio current with the Quick Bulletin of Ocean Conditions.
Description:
Published
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp. 43-56
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