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Surface geostrophic velocity from crossover of satellite altimetry Jinyun Guo1,2, Cheinway Hwang1 and Hsuan-Chang Shih1 1 Dept. of Civil Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 30050, Taiwan, email@example.com, firstname.lastname@example.org 2 Dept. of Land Information and Surveying Engineering, Xuzhou Normal University, 29 Shanghai Road, Tongshan New District, Xuzhou 221116, Jiangsu, China, email@example.com When the Coriolis force is balanced by the pressure gradient in the hydrostatic equilibrium, the ocean current is referred to as geostrophic current. Most ocean currents are approximately geostrophic currents. The geostrophic velocity is calculated from crossover of satellite altimetry in the paper. The uncertainties of geostrophic velocity are analyzed. If the accuracy of the sea slope along the ascending or descending track is at the 10-7 level, the geostrophic velocity can get the accuracy of better than 10cm/s. the Kuroshio area to the east of Taiwan is selected as a test region. A highly accurate and up-to-date geoidal model is determined from the ground-based gravimetry, ship-borne gravimetry, air-borne gravimetry and satellite altimetry. So the more accurate geoidal height can be computed from the model. The geophysical data records (GDRs) of TOPEX/Poseidon between 2002 and 2005 are used to get the highly accurate dynamic heights of crossover points. Then the geostrophic velocities are computed from the crossovers and are basically identical to the current velocities of NCOR.
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