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Comparison of surface velocities determined from altimeter and drifting buoy data

机译:根据高度计和浮标数据确定的表面速度的比较

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Surface velocities determined from trajectory of a drifting buoy from March through November 1987 are compared with surface geostrophic velocities determined from sea surface dynamic topography (SSDT) obtained from altimetry data with the aid of long-term hydrographic observation data. In general, these velocities show similar temporal variations in both zonal and meridional components, except in a period when obvious error is found in the altimetric SSDT field. When the buoy was trapped by several mid-ocean meso-scale eddies, the comparison is especially good. Systematic discrepancy is found, however, when the buoy was in the Kuroshio region, because of using both temporally and spatially smoothed mean SSDT estimated from hydrographic data; instead, surface geostrophic velocities determined from the altimetric SSDT referred to the improved geoid model result in better comparison.
机译:将1987年3月至1987年3月从浮标的轨迹确定的表面速度与根据长期水文观测数据从测高数据获得的海面动态地形(SSDT)确定的表面地转速度进行了比较。通常,这些速度在纬向和经向分量中都显示出类似的时间变化,除了在高空SSDT场中发现明显误差的时期外。当浮标被几个中海中尺度涡旋所困时,这种比较特别好。但是,当浮标位于黑潮地区时,由于使用了从水文数据估算的时间和空间平滑均值SSDT,因此发现了系统差异。取而代之的是,根据改进的大地水准面模型,从高空SSDT确定的地面地转速度可以更好地进行比较。

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