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De-Aliasing of Large-Scale High-Frequency Barotropic Signals from Satellite Altimetry in the Japan/East Sea

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  • 1 Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas, and Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island
  • | 2 Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island
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Abstract

In the Japan/East Sea, energetic high-frequency large-scale barotropic motions are shown to lead to large aliasing errors in satellite altimetry observations. The combined aliasing from several neighboring and crossing tracks produces artificial mesoscale signals in altimeter-mapped products, significantly changing the map interpretation. The alias can be well suppressed by subtracting the large-scale barotropic motions observed by bottom pressure sensors. By using coastal tide gauge data in the Japan/East Sea, about 78% of the alias source variance can be removed, which offers an alternative way to suppress the alias for other time intervals without bottom pressure measurements.

Corresponding author address: Yongsheng Xu, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station #C1100, Austin, TX 78712-0254. Email: yongsheng@utig.ig.utexas.edu

Abstract

In the Japan/East Sea, energetic high-frequency large-scale barotropic motions are shown to lead to large aliasing errors in satellite altimetry observations. The combined aliasing from several neighboring and crossing tracks produces artificial mesoscale signals in altimeter-mapped products, significantly changing the map interpretation. The alias can be well suppressed by subtracting the large-scale barotropic motions observed by bottom pressure sensors. By using coastal tide gauge data in the Japan/East Sea, about 78% of the alias source variance can be removed, which offers an alternative way to suppress the alias for other time intervals without bottom pressure measurements.

Corresponding author address: Yongsheng Xu, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station #C1100, Austin, TX 78712-0254. Email: yongsheng@utig.ig.utexas.edu

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