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Imawaki Shiro Uchida Hiroshi Ichikawa Kaoru Ambe Daisuke 《Space Science Reviews》2003,108(1-2):195-204
The mean sea-surface height obtained from satellite altimeters is different from the geoid by the amount of mean sea-surface
dynamic topography associated with ocean currents. Assuming geostrophy at the sea surface, the mean sea-surface dynamic topography
can be obtained from the mean sea-surface velocity field. This field is derived by combining anomalies (i.e., deviations from
the mean) of sea-surface velocity obtained from altimeter data and in situ surface velocities estimated from trajectories of surface drifting-buoys (hereafter, drifters). Where a drifter measured
the surface velocity, the temporal mean velocity can be estimated by subtracting the altimeter-derived velocity anomaly at
that time from the drifter-measured surface velocity. The method is applied to the surface flow field of the North Pacific,
using TOPEX/POSEIDON and ERS-1/2 altimeter data, and WOCE-TOGA surface drifter data obtained from October 1992 through December
2000. The temporal mean velocity field is estimated with a resolution of quarter degrees in both latitude and longitude. The
obtained mean velocity field clearly shows the Kuroshio and Kuroshio Extension, which are narrower and stronger than the climatological
mean features derived from historical hydrographic data averaged over several decades. Instantaneous velocities are estimated
by summing up these temporal mean velocities and anomalies, every ten days during the eight years. They compare well with
in situ velocities measured by the surface drifters. The instantaneous velocity field shows energetic fluctuation of the Kuroshio
Extension vividly.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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